{"title":"Oil \u0026 Water Seals","description":null,"products":[{"product_id":"sierra-18-0172-oil-seal-for-mercury-mariner-outboards-replaces-oem-26-97530","title":"Sierra Oil Seal 18-0172, Replaces Mercruiser 26-97530, 0.845 Inch Shaft","description":"\u003cp\u003eThe Sierra 18-0172 Oil Seal is a round oil seal engineered as a direct replacement for the Mercruiser 26-97530. It is designed to maintain a reliable barrier against oil and water intrusion at the shaft, keeping lubricants contained and contaminants out for dependable operation. Sierra manufactures this seal to meet or exceed the specifications of the original equipment part it replaces, so it installs and performs the same way as the part it is replacing. The seal features a round profile with a white finish and is sized precisely to a 0.845 inch shaft diameter, 1.500 inch outer diameter, and 0.315 inch width, ensuring a proper fit without modification. This is a single-unit component, sold individually, making it a straightforward swap when servicing a worn or leaking seal. Because it carries the Sierra part number 18-0172 and matches the Mercruiser 26-97530 cross-reference, it is easy to identify and order the correct replacement without guesswork. Marine technicians and boat owners performing routine maintenance or repair on applicable Mercruiser equipment can rely on this seal to restore proper sealing function at the shaft.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0172\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.845 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.315 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999751300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eInterchangeable with Mercruiser 26-97530.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-97530\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0172 Oil Seal replace?\u003c\/strong\u003e The Sierra 18-0172 Oil Seal is interchangeable with Mercruiser 26-97530, so it can be ordered as a direct replacement for that part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the shaft size on this oil seal?\u003c\/strong\u003e The shaft size is 0.845 inches on the Sierra 18-0172 Oil Seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the outer diameter and width of the 18-0172 seal?\u003c\/strong\u003e The outer diameter is 1.500 inches and the width is 0.315 inches on the Sierra 18-0172 Oil Seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0172 a genuine Mercruiser part or an aftermarket equivalent?\u003c\/strong\u003e It is a Sierra-manufactured seal, not a Mercruiser-branded part, but Sierra makes it to meet or exceed the specifications of the Mercruiser 26-97530 it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is this oil seal?\u003c\/strong\u003e The Sierra 18-0172 Oil Seal has a round shape and a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals are included when I order the 18-0172?\u003c\/strong\u003e One unit is included per order of the Sierra 18-0172 Oil Seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0172 Oil Seal weigh?\u003c\/strong\u003e It weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-0172 seal fit in place of a worn factory seal without modification?\u003c\/strong\u003e Yes, because it is dimensionally matched to the Mercruiser 26-97530 it replaces, the Sierra 18-0172 installs in place of the original seal without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0172 Oil Seal?\u003c\/strong\u003e The UPC is 030999751300 for the Sierra 18-0172 Oil Seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra warranty the 18-0172 Oil Seal?\u003c\/strong\u003e Yes, the Sierra 18-0172 Oil Seal is covered under Sierra's limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988027322587,"sku":"SIE-18-0172","price":13.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0172_lg__91673.1558118066.500.750.jpg?v=1785189080"},{"product_id":"sierra-18-0347-valve-cover-gasket-for-mercruiser-470-3-7l-4-cyl-replaces-27-52145-omc-3852693","title":"Sierra Valve Stem Seals (8) 18-0347, Replaces Mercruiser 27-52145, for 4 Cyl. 3.7L Mercruiser 470","description":"\u003cp\u003eThe Sierra 18-0347 is a set of 8 valve stem seals engineered to restore proper oil control at the valve guides on the 4 cyl. 3.7L Mercruiser 470 engine. Valve stem seals wear out over time from heat cycling and contact with the valve stem, letting oil seep down into the combustion chamber or exhaust port; a worn set is a common cause of blue exhaust smoke, fouled plugs, and gradual oil consumption. Sierra manufactures this seal set to meet or exceed original equipment quality, so it installs the same way the original seals did and restores factory sealing performance.\u003c\/p\u003e\u003cp\u003eThis is a set of 8 seals, enough for a complete single-engine valve stem seal replacement job on the applicable Mercruiser 470 engine. Each unit weighs 0.19 pounds. Sierra part number 18-0347 cross-references directly to the Mercury Marine, OMC, GLM, Mallory, and Volvo Penta part numbers listed below, so it is a straightforward like-for-like replacement whether the engine currently carries an original Mercury\/OMC seal or a prior aftermarket equivalent.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0347\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Valve Stem Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 8 seals per set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.19 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282257347\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e 4 cyl. 3.7L Mercruiser 470\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 27-52145, 27-806452, 27-34041; OMC 913277, 912981, 3852693; Volvo Penta 3852693; GLM 32210; Mallory 9-61317\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e4 cyl. 3.7L Mercruiser 470\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 32210\u003c\/li\u003e\n\u003cli\u003eMallory 9-61317\u003c\/li\u003e\n\u003cli\u003eMercruiser 27-52145\u003c\/li\u003e\n\u003cli\u003eMercruiser 27-806452\u003c\/li\u003e\n\u003cli\u003eMercruiser 27-34041\u003c\/li\u003e\n\u003cli\u003eOMC 913277\u003c\/li\u003e\n\u003cli\u003eOMC 912981\u003c\/li\u003e\n\u003cli\u003eOMC 3852693\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3852693\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0347 valve stem seal set include?\u003c\/strong\u003e The Sierra 18-0347 set includes 8 valve stem seals, enough for a full single-engine replacement on the applicable 4 cyl. 3.7L Mercruiser 470 engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does part number 18-0347 fit?\u003c\/strong\u003e Sierra 18-0347 is built for the 4 cyl. 3.7L Mercruiser 470 engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0347 the same as Mercury Marine 27-52145?\u003c\/strong\u003e Yes, Sierra 18-0347 directly cross-references to Mercury Marine 27-52145, along with Mercury Marine 27-806452 and 27-34041, and installs as a direct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0347 replace OMC valve stem seals?\u003c\/strong\u003e Yes, Sierra 18-0347 cross-references to OMC part numbers 913277, 912981, and 3852693.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this compatible with Volvo Penta engines?\u003c\/strong\u003e Sierra 18-0347 cross-references to Volvo Penta part number 3852693.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in the 18-0347 set?\u003c\/strong\u003e The set contains 8 valve stem seals, matching a full complement for the 4 cyl. 3.7L Mercruiser 470 engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0347 seal set weigh?\u003c\/strong\u003e The set weighs 0.19 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the symptoms of worn valve stem seals that 18-0347 addresses?\u003c\/strong\u003e Worn valve stem seals commonly cause blue exhaust smoke, fouled spark plugs, and gradual oil consumption; replacing them with the Sierra 18-0347 set restores proper oil control at the valve guides.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0347 an OEM part or an aftermarket replacement?\u003c\/strong\u003e Sierra 18-0347 is an aftermarket part manufactured to meet or exceed original equipment quality, cross-referenced to the Mercury Marine, OMC, and Volvo Penta OEM numbers it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0347 also cross-reference to GLM or Mallory part numbers?\u003c\/strong\u003e Yes, Sierra 18-0347 cross-references to GLM 32210 and Mallory 9-61317.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988068610267,"sku":"SIE-18-0347","price":93.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0347_lg__66533.1558118554.500.750.jpg?v=1785188407"},{"product_id":"sierra-18-0486-oil-strainer-seal-for-yamaha-outboard-gearcase-mpn-118-0486","title":"Sierra Oil Strainer Seal 18-0486 for Yamaha Outboard Gearcase \u0026 Drive","description":"\u003cp\u003eThe Sierra Oil Strainer Seal, part number 18-0486, is a replacement seal designed for Yamaha outboard gearcase and drive applications. It seals the oil strainer to prevent lubricant leaks and contamination from entering the gearcase, helping protect internal gear and bearing surfaces from water intrusion and debris. Keeping this seal in good condition is important whenever the oil strainer or gearcase is serviced, since a worn or damaged seal can allow gear lube to leak out or allow water to seep in, leading to premature wear of gearcase components. This is a small, low-cost part that is easy to overlook during a gearcase service, but it plays a direct role in keeping the lubrication system sealed and functioning correctly. It ships as a compact, lightweight seal sized to fit directly in place of the original equipment part, making it a straightforward swap during routine maintenance or a gearcase rebuild. Sierra is a widely recognized name in marine replacement parts, and this seal is manufactured to work as a direct fit for the Yamaha outboard gearcase and drive systems it is designed for.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0486\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Strainer Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Gearcase \u0026amp; Drive Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 4 x 4 x 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282385798\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha outboard gearcase and drive applications\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0486 oil strainer seal used for?\u003c\/strong\u003e It seals the oil strainer in Yamaha outboard gearcase and drive applications, preventing gear lube leaks and keeping water and debris out of the gearcase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this seal fit Yamaha outboards specifically?\u003c\/strong\u003e Yes, Sierra part 18-0486 is designed for Yamaha outboard gearcase and drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-0486 oil strainer seal?\u003c\/strong\u003e The Sierra 18-0486 oil strainer seal has package dimensions of 4 x 4 x 0.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the oil strainer seal weigh?\u003c\/strong\u003e The Sierra 18-0486 oil strainer seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0486 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-branded replacement part, sold under Sierra's own part number 18-0486 rather than an OEM Yamaha number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the oil strainer seal on my Yamaha outboard?\u003c\/strong\u003e Replace Sierra part 18-0486 any time the oil strainer is removed for gearcase service, or if it shows signs of wear, cracking, or leaking gear lube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if a worn oil strainer seal is not replaced?\u003c\/strong\u003e A worn 18-0486 seal can allow gear lubricant to leak out or let water intrude into the gearcase, which can lead to premature wear of internal gearcase components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering Sierra 18-0486 gets you the single oil strainer seal component for the gearcase oil strainer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0486 seal easy to install myself?\u003c\/strong\u003e Yes, it is a simple seal that fits in place of the original oil strainer seal during routine gearcase maintenance or a rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-0486 seal made from?\u003c\/strong\u003e Material details for the Sierra 18-0486 oil strainer seal are not specified by the manufacturer.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988075163867,"sku":"SIE-18-0486","price":7.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0486__85483.1739477160.500.750.jpg?v=1785189080"},{"product_id":"sierra-18-0515-oil-seal-replaces-mercury-36-30530-fits-mercury-4-hp-40-outboard-powerhead-crankshaft","title":"Sierra 18-0515 Oil Seal, Replaces Mercury 26-30530, for Outboard Powerhead Crankshaft","description":"\u003cp\u003eThe Sierra 18-0515 is a round oil seal designed for Mercury outboard powerhead crankshaft applications. It seals the crankshaft bore to keep lubricating oil contained within the powerhead while preventing water and contaminants from entering, protecting internal engine components from leaks and premature wear. The seal is finished in white and is built to Sierra's standard fit and function for this position.\u003c\/p\u003e\u003cp\u003eThis seal carries precise dimensions of 0.540 inch shaft size, 1.004 inch outside diameter, and 0.303 inch width, matching the profile of the Mercury OEM oil seal it replaces. Because oil seals in this size range are used across multiple engine positions, always confirm these three measurements against your old seal or your engine's parts diagram before ordering to ensure a correct fit.\u003c\/p\u003e\u003cp\u003eSierra International supplies replacement parts for marine engines, and the 18-0515 is cataloged specifically as a Mercury outboard powerhead crankshaft seal, making it a straightforward like-for-like replacement for the corresponding Mercury OEM part. It is sold as a single seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0515\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-30530\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.540 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 1.004 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.303 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874276\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury outboard powerhead crankshaft seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Mercury outboard powerhead crankshaft applications requiring an oil seal with a 0.540 inch shaft size, 1.004 inch outside diameter, and 0.303 inch width. Verify these dimensions against your existing seal before purchase.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-30530\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0515 oil seal fit?\u003c\/strong\u003e The Sierra 18-0515 is cataloged for Mercury outboard powerhead crankshaft applications, sealing the crankshaft bore to retain lubricating oil and keep out contaminants.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0515 the same as Mercury 26-30530?\u003c\/strong\u003e Yes, the 18-0515 is Sierra's direct replacement for Mercury OEM oil seal 26-30530, matching its shaft size, outside diameter, and width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0515 oil seal?\u003c\/strong\u003e This seal measures 0.540 inches at the shaft, 1.004 inches on the outside diameter, and 0.303 inches wide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0515 oil seal?\u003c\/strong\u003e It is white, as manufactured by Sierra International.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0515 oil seal weigh?\u003c\/strong\u003e The Sierra 18-0515 weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if this seal will fit my engine?\u003c\/strong\u003e Compare the shaft size, outside diameter, and width of your existing seal to the 18-0515 specs of 0.540 inches, 1.004 inches, and 0.303 inches respectively, since seals in this size range can be used in more than one engine position.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0515 a genuine Mercury part or aftermarket?\u003c\/strong\u003e The 18-0515 is a Sierra-manufactured aftermarket seal built to replace Mercury OEM part 26-30530, not a genuine Mercury-branded component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-0515 seal?\u003c\/strong\u003e The Sierra 18-0515 oil seal is round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the package with the 18-0515?\u003c\/strong\u003e The package includes one Sierra 18-0515 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0515 oil seal?\u003c\/strong\u003e The UPC for this Sierra oil seal is 030999874276.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the 18-0515?\u003c\/strong\u003e The 18-0515 is classified as a Mercury outboard powerhead crankshaft seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988075524315,"sku":"SIE-18-0515","price":9.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0515_lg__79364.1558118539.500.750.jpg?v=1785188113"},{"product_id":"sierra-18-0525-oil-seal-for-mercury-mercruiser-26-45587-0-390-in-shaft-marine-engine-seal","title":"Sierra Oil Seal 18-0525, Replaces 26-45587, 0.390 x 0.628 x 0.124 Inch","description":"\u003cp\u003eThe Sierra 18-0525 is a precision oil seal sized for a 0.390 inch shaft, with a 0.628 inch outside diameter and a 0.124 inch width. It is a direct replacement for OEM number 26-45587 and features a machined exterior finish for a consistent, leak-resistant fit at the shaft bore.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0525\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-45587\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.390 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 0.628 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.124 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874368\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned as a dimensional and functional match for applications originally fitted with OEM part 26-45587. Confirm your existing seal or housing calls for 26-45587 before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-45587\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part does the Sierra 18-0525 replace?\u003c\/strong\u003e It is a direct replacement for OEM number 26-45587, so any application calling for that part number accepts the Sierra 18-0525 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the shaft size for this seal?\u003c\/strong\u003e 0.390 inches is the shaft size for the Sierra 18-0525 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the outside diameter and width of the 18-0525 seal?\u003c\/strong\u003e The Sierra 18-0525 has a 0.628 inch outside diameter and a 0.124 inch width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0525 oil seal weigh?\u003c\/strong\u003e It weighs 0.01 pounds, consistent with its small, compact seal size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0525 seal genuine Sierra or aftermarket?\u003c\/strong\u003e Yes, the 18-0525 is a genuine Sierra-branded part, manufactured as a direct-fit equivalent to OEM 26-45587.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-0525 have?\u003c\/strong\u003e It has a machined exterior finish for consistent, accurate sealing at the shaft bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-0525 in place of 26-45587 without modification?\u003c\/strong\u003e Yes, the Sierra 18-0525 is dimensionally matched to OEM 26-45587 and installs as a direct swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0525?\u003c\/strong\u003e You receive one Sierra 18-0525 oil seal sized to 0.390 inch shaft, 0.628 inch OD, and 0.124 inch width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the part number 18-0525 identify the shaft size or the OEM equivalent?\u003c\/strong\u003e 18-0525 is the Sierra part number itself; 26-45587 is the OEM number it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this seal suitable for both port and starboard applications?\u003c\/strong\u003e No side-specific designation is given for the 18-0525; it is a standard oil seal sized by shaft diameter, OD, and width rather than by mounting side.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988075589851,"sku":"SIE-18-0525","price":7.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0525_lg__12658.1558118991.500.750.jpg?v=1785188326"},{"product_id":"oil-seal-26-48443-for-mercruiser-stern-drive-sierra-18-0526-0-750-id-x-1-379-od-x-0-256","title":"Sierra Oil Seal 18-0526 - OEM 26-48443 for Mercruiser Stern Drive, 0.750 Inch Shaft","description":"\u003cp\u003eThe Sierra 18-0526 is an oil seal engineered for Mercruiser stern drive applications, replacing OEM number 26-48443. It is built to contain gear lubricant and keep water and contaminants out of the drive housing, protecting internal gears and bearings from premature wear. The seal measures 0.750 inches at the shaft, 1.379 inches on the outer diameter, and 0.256 inches in width, and is finished in black. Sierra constructs this seal using quality materials selected for exceptional life and performance in the marine environment, where seals are constantly exposed to water, salt, and lubricant. Each unit ships as a single oil seal, ready to install as a direct replacement during drive service or seal maintenance. Because stern drive seals are a wear item that hardens and loses sealing ability over time, replacing the 18-0526 at the proper interval helps prevent lubricant leaks and water intrusion that can lead to more costly drive repairs.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0526\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.379 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.256 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 oil seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874375\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser stern drive\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-48443\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0526 oil seal replace?\u003c\/strong\u003e It is a direct replacement for OEM number 26-48443 used on Mercruiser stern drive units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shaft size is the 18-0526 seal designed for?\u003c\/strong\u003e This seal has a 0.750 inch shaft size, with a 1.379 inch outer diameter and a 0.256 inch width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0526 oil seal?\u003c\/strong\u003e It is finished in black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0526 oil seal weigh?\u003c\/strong\u003e The seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in one order?\u003c\/strong\u003e One order includes a single 18-0526 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-0526 oil seal used for?\u003c\/strong\u003e It seals the Mercruiser stern drive housing, keeping gear lubricant in and water and debris out.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0526 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket Sierra part manufactured as a replacement for OEM number 26-48443, not an OEM Mercruiser part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should a stern drive oil seal like the 18-0526 be replaced?\u003c\/strong\u003e A seal in this position should be replaced when it hardens, leaks lubricant, or allows water intrusion into the drive housing, or as part of routine drive service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-0526 oil seal?\u003c\/strong\u003e The UPC for this oil seal is 030999874375.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0526 seal come with installation hardware?\u003c\/strong\u003e No, the package includes only the oil seal itself; no additional hardware is included.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988077031643,"sku":"SIE-18-0526","price":14.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0526_lg__95684.1558119055.500.750.jpg?v=1785188305"},{"product_id":"sierra-18-0558-oil-seal-for-volvo-penta-aq200-aq290-replaces-oem-851407-44-x-58-33-x-7-mm","title":"Sierra Seal 18-0558, 44mm ID x 7mm Width Marine Shaft Seal","description":"\u003cp\u003eThe Sierra 18-0558 is a marine oil seal built to keep water and contaminants out while retaining lubrication in rotating shaft applications on inboard and sterndrive engines. It is engineered to meet the demands of high-horsepower marine engines and to hold up in the harsh marine environment, where constant exposure to saltwater, vibration, and heat cycling causes ordinary seals to fail prematurely. Sierra states that this seal meets or exceeds the performance of the original equipment part it replaces, making it a dependable choice when a shaft seal needs replacing during an engine rebuild, lower-unit service, or routine maintenance.\u003c\/p\u003e\u003cp\u003eThe seal has a machined exterior finish for a precise, consistent fit against its mating bore, and it is sized with a 44 mm inside diameter and a 7 mm width. Its compact size and light weight make it easy to install as part of a broader engine or drive service without adding measurable bulk to the assembly. Sierra supplies parts like this one to OEM engine manufacturers and boat builders, so the 18-0558 is manufactured to the same quality standard used in original production.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0558\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter:\u003c\/strong\u003e 44 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 7 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282265427\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-0558 seal?\u003c\/strong\u003e The Sierra 18-0558 seal has a 44 mm inside diameter and a 7 mm width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0558 seal weigh?\u003c\/strong\u003e It weighs 0.04 pounds, a lightweight component sized for shaft seal applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0558 an OEM-equivalent part?\u003c\/strong\u003e Yes, Sierra states this seal meets or exceeds the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-0558 seal have?\u003c\/strong\u003e A machined exterior finish is used on the Sierra 18-0558 to ensure a precise, consistent fit in its mating bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-0558?\u003c\/strong\u003e The order includes one Sierra 18-0558 seal; no additional hardware or gaskets are bundled with it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0558 seal be used in marine engine or drive service?\u003c\/strong\u003e Yes, it is designed for use as a shaft seal in marine engine and drive applications where water and contaminant exclusion is required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra manufacture the 18-0558 to OEM standards?\u003c\/strong\u003e Sierra supplies parts to OEM engine manufacturers and boat builders, and the 18-0558 seal is produced to that same quality standard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0558 seal still in production?\u003c\/strong\u003e Yes, the Sierra 18-0558 seal is an active, currently produced part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-0558 different from a generic aftermarket seal?\u003c\/strong\u003e The 18-0558 is manufactured by Sierra to meet or exceed the original equipment part's specifications, rather than being a generic universal-fit substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the inside diameter of the 18-0558 shaft seal?\u003c\/strong\u003e The inside diameter of the Sierra 18-0558 is 44 mm, sized to seat around the shaft it seals.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988078604507,"sku":"SIE-18-0558","price":19.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-0558__94667.1722518353.500.750.jpg?v=1785188012"},{"product_id":"sierra-18-0559-marine-oil-seal-replaces-omc-332585-evinrude-johnson-outboard-prop-driveshaft-seal-0-285-id-x-0-357-od-x-0-940","title":"Sierra 18-0559 Outboard Prop Shaft Oil Seal, Replaces OMC 332585","description":"\u003cp\u003eThe Sierra 18-0559 is an oil seal built for outboard prop shaft and driveshaft applications. It keeps water out and lubricant in around the rotating shaft, protecting the lower unit gearcase from water intrusion and preventing lubricant loss that can lead to premature gear and bearing wear. The seal is sized to a 0.357 inch outside diameter, a 0.285 inch shaft size, and a 0.940 inch width, so it seats precisely in the housing bore it is designed for and rides correctly against the shaft without leaking.\u003c\/p\u003e\u003cp\u003eThis part is a direct equivalent to OEM OMC 332585, giving boat owners and marine technicians a way to source the correct seal without going through OMC directly. It is a small, precise component, so correct orientation and a light coat of marine grease during installation help it seat fully and seal properly on the first try. Because it is a wear item exposed to constant water contact and shaft rotation, it is a common preventive-maintenance replacement during lower unit service, gearcase rebuilds, or whenever water is found in the gear lubricant.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0559\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 0.357 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.285 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.940 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874603\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 332585\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for outboard prop shaft and driveshaft seal applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 332585\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0559 oil seal replace?\u003c\/strong\u003e The Sierra 18-0559 is a direct cross reference to OEM OMC 332585, so it installs as a like-for-like replacement for that part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra 18-0559 oil seal?\u003c\/strong\u003e It measures 0.357 inches outside diameter, 0.285 inches shaft size, and 0.940 inches in width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0559 an OEM part or an aftermarket equivalent?\u003c\/strong\u003e It is a Sierra-branded aftermarket seal manufactured as a direct equivalent to OEM OMC 332585, not an OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat application is the 18-0559 seal used for?\u003c\/strong\u003e This oil seal is designed for outboard prop shaft and driveshaft sealing, keeping water out of the gearcase and lubricant in around the rotating shaft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0559 oil seal weigh?\u003c\/strong\u003e The seal weighs 0.01 pounds, consistent with its small, precise seal profile.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when you order the 18-0559?\u003c\/strong\u003e Ordering the Sierra 18-0559 gets you a single oil seal sized to a 0.357 inch O.D., 0.285 inch shaft size, and 0.940 inch width; no gaskets or hardware are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace this seal?\u003c\/strong\u003e If water shows up in the gearcase lubricant or the lower unit is being rebuilt, the prop shaft seal is a common wear item to replace, and the 18-0559 is sized for that job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0559 come with an OEM number I can cross-reference?\u003c\/strong\u003e Yes, its OEM cross reference is OMC 332585, which can be used to confirm it is the correct seal for your application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the Sierra 18-0559 installed?\u003c\/strong\u003e The seal should be pressed squarely into its housing bore with the correct orientation and a light coat of marine grease on the lip to help it seat fully against the 0.285 inch shaft without leaking.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0559 oil seal?\u003c\/strong\u003e The UPC for this Sierra oil seal, part number 18-0559, is 030999874603.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988078735579,"sku":"SIE-18-0559","price":2.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0559_lg__33351.1558120404.500.750.jpg?v=1785188937"},{"product_id":"sierra-18-0564-oil-seal-for-mercury-outboard-powerhead-replaces-mercury-26-888483-1-250-id-x-1-690-od-x-0-256","title":"Sierra 18-0564 Oil Seal, White, Replaces Mercury Marine 26-888483","description":"\u003cp\u003eThe Sierra 18-0564 Oil Seal is a machined, white-finish seal designed for outboard powerhead applications where a reliable, leak-resistant seal is needed around a rotating shaft. Its compact size, measuring 0.39 x 0.39 x 0.39 inches, makes it suited for tight clearances found in outboard powerhead assemblies. The seal is built with a machined exterior for a consistent, precise fit, helping maintain proper sealing pressure and reduce the risk of oil or lubricant leakage during operation.\u003c\/p\u003e\u003cp\u003eThis oil seal is a universal-fit component, meaning it is not restricted to a single engine family, and it directly replaces Mercury Marine part number 26-888483, making it a straightforward swap for boat owners and technicians performing powerhead seal maintenance. At just 0.01 pounds, it is a lightweight, small-parts item that is easy to keep on hand for routine service work or as a spare when servicing Mercury outboard powerheads.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0564\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282200275\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 26-888483\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis oil seal is a universal-fit part and is not limited to a specific engine model or year range.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 26-888483\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0564 oil seal used for?\u003c\/strong\u003e The Sierra 18-0564 is an oil seal designed to prevent lubricant leakage around a rotating shaft in an outboard powerhead, helping maintain proper internal sealing during engine operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0564 oil seal replace an OEM Mercury part?\u003c\/strong\u003e Yes, the Sierra 18-0564 oil seal directly replaces Mercury Marine part number 26-888483.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0564 oil seal?\u003c\/strong\u003e This oil seal is white in color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow big is the Sierra 18-0564 oil seal?\u003c\/strong\u003e The Sierra 18-0564 measures 0.39 x 0.39 x 0.39 inches, a compact size intended for tight powerhead clearances.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0564 oil seal weigh?\u003c\/strong\u003e It weighs 0.01 pounds, making it a lightweight small-parts item.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0564 a universal-fit part?\u003c\/strong\u003e Yes, the 18-0564 oil seal is listed as a universal fit rather than being restricted to one specific engine model.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-0564 oil seal have?\u003c\/strong\u003e The seal has a machined exterior finish, which supports a precise, consistent fit for sealing performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0564 an aftermarket or genuine Mercury part?\u003c\/strong\u003e The 18-0564 is a Sierra-branded aftermarket oil seal that cross-references to and replaces Mercury Marine 26-888483.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-0564 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-0564 oil seal is 808282200275.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the Sierra 18-0564 as a spare part for powerhead maintenance?\u003c\/strong\u003e Yes, due to its small size and low weight of 0.01 pounds, the 18-0564 oil seal is practical to keep on hand as a spare for outboard powerhead servicing.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988078801115,"sku":"SIE-18-0564","price":19.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0564__83910.1737874349.500.750.jpg?v=1785189034"},{"product_id":"sierra-18-0577-carrier-assembly-oil-seal-replaces-mercruiser-66081a2-fits-alpha-one-gen-ii-upper-gear-housing","title":"Sierra 18-0577 Carrier Oil Seal Assembly, Replaces Mercruiser 66081A2, for Alpha One and Gen II Stern Drives","description":"\u003cp\u003eThe Sierra 18-0577 Carrier Oil Seal Assembly is a replacement seal for the upper gear housing carrier on MerCruiser stern drive units. It fits the 888\/228\/250\/260 series, the R and MR designations, Alpha One (including Alpha One SS and the counter-rotating CR versions), and Alpha One Gen II drives (including the CR versions). This seal assembly is a direct cross to Mercruiser 66081A2, 35993A1, 66081A1, and 66081A4, as well as GLM 28370 and Mallory 9-78100, so it can be used to service drives originally fitted with any of those parts.\u003c\/p\u003e\u003cp\u003eThe carrier oil seal keeps gear lube contained within the upper gear housing while preventing water intrusion at the drive shaft carrier, protecting the gear set from contamination and low-lubricant wear. It is typically installed as part of a routine upper gear housing seal kit service or whenever the carrier bearing\/seal area is opened up for repair. Sierra manufactures this part to meet or exceed the specification of the original equipment it replaces, and it is backed by Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0577\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Carrier Oil Seal Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Upper Gear Housing Seal Kits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999973986\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999973986\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e GLM 28370, Mallory 9-78100, Mercruiser 66081A2, 35993A1, 66081A1, 66081A4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 888\/228\/250\/260, 1977-1982\u003c\/li\u003e\n\u003cli\u003eMerCruiser R, 1983\u003c\/li\u003e\n\u003cli\u003eMerCruiser MR Alpha One, 1984-1990\u003c\/li\u003e\n\u003cli\u003eMerCruiser MR Alpha One (CR), 1984-1990\u003c\/li\u003e\n\u003cli\u003eMerCruiser Alpha One SS, 1986-1989\u003c\/li\u003e\n\u003cli\u003eMerCruiser Alpha One Gen II, 1991-1995\u003c\/li\u003e\n\u003cli\u003eMerCruiser Alpha One Gen II (CR), 1991-1995\u003c\/li\u003e\n\u003cli\u003eMerCruiser Alpha One Gen II, 1996-1997\u003c\/li\u003e\n\u003cli\u003eMerCruiser Alpha One Gen II (CR), 1996-2010\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 28370\u003c\/li\u003e\n\u003cli\u003eMallory 9-78100\u003c\/li\u003e\n\u003cli\u003eMercruiser 66081A2\u003c\/li\u003e\n\u003cli\u003eMercruiser 35993A1\u003c\/li\u003e\n\u003cli\u003eMercruiser 66081A1\u003c\/li\u003e\n\u003cli\u003eMercruiser 66081A4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0577 Carrier Oil Seal Assembly fit?\u003c\/strong\u003e It fits MerCruiser stern drive units including the 888\/228\/250\/260 series (1977-1982), the R (1983) and MR (1984-1990) designations, Alpha One and Alpha One SS (1986-1989), and Alpha One Gen II drives (1991-2010), including the counter-rotating (CR) versions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0577 seal a genuine OEM part or aftermarket?\u003c\/strong\u003e Sierra 18-0577 is a Sierra-manufactured replacement part, built to meet or exceed the original equipment specification for the Mercruiser carrier oil seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does Sierra 18-0577 cross to?\u003c\/strong\u003e This carrier oil seal assembly is interchangeable with Mercruiser 66081A2, 35993A1, 66081A1, and 66081A4, as well as GLM 28370 and Mallory 9-78100.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0577 fit both Alpha One and Alpha One Gen II drives?\u003c\/strong\u003e Yes, the 18-0577 carrier oil seal is used across Alpha One (1984-1990), Alpha One SS (1986-1989), and Alpha One Gen II (1991-2010) MerCruiser stern drives, including the CR variants.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0577 weigh?\u003c\/strong\u003e The Sierra 18-0577 Carrier Oil Seal Assembly weighs 0.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the 18-0577 package?\u003c\/strong\u003e The Sierra 18-0577 ships as a single carrier oil seal assembly, unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the function of the carrier oil seal on a stern drive?\u003c\/strong\u003e The carrier oil seal seated in the upper gear housing keeps gear lubricant contained around the drive shaft carrier while blocking water intrusion, protecting the gear set from contamination and lubricant loss.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the carrier oil seal be replaced?\u003c\/strong\u003e The 18-0577 carrier oil seal is typically replaced during a upper gear housing seal service, or any time the carrier bearing and seal area is opened up for repair or found to be leaking gear lube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0577 fit the MerCruiser 888\/228\/250\/260 models?\u003c\/strong\u003e Yes, the Sierra 18-0577 is listed for the MerCruiser 888\/228\/250\/260 series produced 1977-1982.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0577 covered by a warranty?\u003c\/strong\u003e Sierra 18-0577, like other Sierra parts, is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988078866651,"sku":"SIE-18-0577","price":53.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0577_lg__38802.1558120940.500.750.jpg?v=1785188852"},{"product_id":"sierra-18-0578-rear-main-oil-seal-for-mercruiser-3-7l-4-cyl-replaces-mercruiser-26-67388","title":"Sierra 18-0578 One-Piece Rear Main Seal \/ Timing Cover Seal, Replaces 26-67388","description":"\u003cp\u003eThe Sierra 18-0578 is a one-piece rear main seal and timing cover seal built for marine engine crankshaft sealing applications. Its one-piece construction combines the rear main seal and timing cover seal function into a single component, simplifying installation compared to multi-piece seal designs and reducing the number of separate parts a technician needs to fit and align during an engine rebuild or reseal job. The seal has a white finish and a compact, low-profile design measuring 5.6 x 3.7 x 0.6 inches, with a light overall weight of 0.12 pounds that keeps it easy to handle during service work.\u003c\/p\u003e\u003cp\u003eThis seal directly replaces OEM part number 26-67388, making it a straightforward drop-in option when the original equipment seal needs replacement. Each Sierra seal is built to meet or exceed the specifications of the original equipment part it replaces, giving boat owners and marine technicians a reliable aftermarket alternative for crankshaft sealing repairs. It is engineered specifically for Mercruiser crankshaft sealing applications, and is sold as a single unit.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0578\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Rear Main Seal \/ Timing Cover Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e One-Piece\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Marine Engine Crankshaft Sealing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 5.6 x 3.7 x 0.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999973993\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999973993\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-67388\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eEngineered for Mercruiser crankshaft sealing applications as a one-piece rear main seal and timing cover seal.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-67388\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0578 replace?\u003c\/strong\u003e The Sierra 18-0578 replaces OEM part number 26-67388, so it is a direct fit wherever that original seal was used.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0578 a one-piece or two-piece seal?\u003c\/strong\u003e It is a one-piece design that combines the rear main seal and timing cover seal into a single component, which simplifies installation versus a multi-piece seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0578 seal?\u003c\/strong\u003e It has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow big is the Sierra 18-0578 seal?\u003c\/strong\u003e The Sierra 18-0578 measures 5.6 x 3.7 x 0.6 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0578 weigh?\u003c\/strong\u003e 0.12 pounds, making it easy to handle during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-0578 manufactured?\u003c\/strong\u003e The country of origin listed for the Sierra 18-0578 is China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0578 meet OEM specifications?\u003c\/strong\u003e Yes, the Sierra 18-0578 is built to meet or exceed the specifications of the original equipment seal it replaces, OEM 26-67388.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when you order the Sierra 18-0578?\u003c\/strong\u003e One Sierra 18-0578 one-piece rear main seal and timing cover seal (unit count of 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0578?\u003c\/strong\u003e The UPC is 030999973993.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat application is the Sierra 18-0578 designed for?\u003c\/strong\u003e The 18-0578 is engineered for Mercruiser crankshaft sealing applications as a rear main seal and timing cover seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0578 covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-0578 carries a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988080177371,"sku":"SIE-18-0578","price":24.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0578_lg__30159.1558120992.500.750.jpg?v=1785188494"},{"product_id":"sierra-18-0579-oil-seal-replaces-mercury-force-26-41131-mercury-outboard-powerhead-seal","title":"Sierra Oil Seal 18-0579, Replaces Mercury 26-41131, White","description":"\u003cp\u003eThe Sierra 18-0579 Oil Seal is a rubber powerhead seal engineered to seal rotating shafts against oil and water intrusion in marine outboard and sterndrive powerheads. It is built to meet or exceed the specifications of the original equipment part it replaces, making it a reliable direct-fit choice for engine rebuilds and routine seal replacement. The seal is molded in white rubber and sized to a 1.313 inch outer diameter, a 1.141 inch shaft size, and a 0.344 inch width, allowing it to seat correctly in the powerhead bore while maintaining a tight, low-friction fit against the shaft. As a wear item, this seal is commonly replaced during powerhead teardowns, gearcase service, or whenever oil seepage is found around the shaft. It cross-references directly to Mercury and Chrysler\/Force\/US Marine part number 26-41131, giving buyers a straightforward way to confirm fit against their original part number before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0579\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.313 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 1.141 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.344 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-41131\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDirect cross-reference to Mercury and Chrysler\/Force\/US Marine part number 26-41131; confirm against your original part number before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-41131\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0579 Oil Seal replace?\u003c\/strong\u003e The Sierra 18-0579 Oil Seal is a direct cross-reference to Mercury and Chrysler\/Force\/US Marine part number 26-41131.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0579 seal?\u003c\/strong\u003e This seal measures 1.313 inches outer diameter, 1.141 inches shaft size, and 0.344 inches in width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0579 Oil Seal made from?\u003c\/strong\u003e It is molded from rubber for durable sealing against oil and water in marine powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0579 seal?\u003c\/strong\u003e The 18-0579 seal is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0579 Oil Seal weigh?\u003c\/strong\u003e This seal weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0579 seal equivalent to the original equipment part?\u003c\/strong\u003e Yes, Sierra states this oil seal meets or exceeds the original equipment part it replaces, part number 26-41131.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the 18-0579 seal typically installed?\u003c\/strong\u003e It is installed in the powerhead bore to seal a rotating shaft, and is commonly replaced during powerhead or gearcase service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in an order of 18-0579?\u003c\/strong\u003e The Sierra 18-0579 Oil Seal is supplied as a single unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace this seal?\u003c\/strong\u003e Oil seepage or leakage around the shaft during a powerhead teardown is the typical reason to replace the 18-0579 seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0579 seal fit non-Mercury applications?\u003c\/strong\u003e It cross-references to Mercury and Chrysler\/Force\/US Marine 26-41131, so any application originally using 26-41131 is a match.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988082045147,"sku":"SIE-18-0579","price":14.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-0579__39305.1722346079.500.750.jpg?v=1785188923"},{"product_id":"oil-seal-for-mercury-force-outboard-powerhead-replaces-26-41132-sierra-18-0580","title":"Sierra 18-0580 Oil Seal, Replaces Mercury\/Chrysler\/Force 26-41132","description":"\u003cp\u003eThe Sierra 18-0580 Oil Seal is a round, white oil seal engineered as a direct interchange for the 26-41132 seal used across multiple outboard powerhead applications. It is built to the same critical dimensions as the original equipment part it replaces, with a 1.250 inch outer diameter, a 0.750 inch shaft size, and a 0.312 inch width, so it seats and seals correctly in the same bore and against the same shaft as the part it replaces. As a powerhead seal, its primary job is to keep lubricating oil contained around a rotating shaft while excluding water and debris from the crankcase area, protecting internal components from contamination and oil loss.\u003c\/p\u003e\u003cp\u003eSierra manufactures this seal to meet or exceed the performance of the original equipment part, making it a straightforward replacement when an outboard's powerhead seal has hardened, cracked, or begun to leak. Because it is sold as a single seal, it drops in wherever a 26-41132 (or its cross-referenced equivalents) is specified, without requiring any modification to the surrounding housing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0580\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-41132\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.312 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury Outboard Powerhead Seals and O-Rings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications originally specified with a 26-41132 oil seal or its cross-referenced equivalents.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-41132\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0580 oil seal replace?\u003c\/strong\u003e It replaces OEM number 26-41132. The Sierra 18-0580 oil seal is built to the same dimensions as that original part so it installs as a direct swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-0580 oil seal?\u003c\/strong\u003e The Sierra 18-0580 measures 1.250 inches on the outer diameter, has a 0.750 inch shaft size, and is 0.312 inches wide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0580 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured replacement seal, not a part sold under the original equipment manufacturer's own brand. Sierra states it meets or exceeds the performance of the original 26-41132 seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and shape is the 18-0580 oil seal?\u003c\/strong\u003e It is a round seal finished in white, matching the standard oil seal shape used in outboard powerhead applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0580 oil seal weigh?\u003c\/strong\u003e The seal weighs 0.02 pounds, consistent with a small, single powerhead seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the purpose of the 18-0580 oil seal in an outboard powerhead?\u003c\/strong\u003e This seal keeps lubricating oil contained around a rotating shaft while keeping water and debris out of the crankcase area, protecting internal powerhead components from contamination and oil loss.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0580 come as a single seal or a kit?\u003c\/strong\u003e It is sold as a single oil seal, part number 18-0580, not as part of a multi-seal kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-0580 fit if my part is marked 26-41132?\u003c\/strong\u003e Yes, a part marked 26-41132 is the OEM number that the Sierra 18-0580 oil seal is designed to replace directly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need to replace an oil seal like the 18-0580?\u003c\/strong\u003e Signs of a failing powerhead oil seal include visible oil leakage around the shaft, water intrusion into the crankcase, or a hardened and cracked seal surface; the 18-0580 addresses these issues as a direct replacement for the 26-41132 seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the Sierra 18-0580?\u003c\/strong\u003e The 18-0580 is categorized as a powerhead seal, part of Sierra's outboard powerhead seals and O-rings line.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083781851,"sku":"SIE-18-0580","price":13.1,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0580_lg__51203.1558121135.500.750.jpg?v=1785189148"},{"product_id":"sierra-18-0586-oil-seal-replaces-mercury-chrysler-force-26-99325-outboard-powerhead-seal","title":"Sierra Oil Seal 18-0586, Replaces Chrysler Force 26-99325, Mercury Outboard Powerhead","description":"\u003cp\u003eThe Sierra 18-0586 Oil Seal is a precision-machined replacement seal engineered for Mercury outboard powerhead service, covering applications that trace back to Chrysler Force outboard motors now supported under the Mercury Marine parts line. This small but critical component seals against oil and water intrusion at rotating shaft interfaces within the powerhead, helping maintain proper lubrication pressure and preventing contamination that can lead to premature wear or corrosion inside the engine.\u003c\/p\u003e\u003cp\u003eBuilt to Sierra's marine-grade manufacturing standards, this seal is manufactured in Taiwan and machined to tight tolerances so it seats correctly and holds its seal under the vibration, heat cycling, and saltwater exposure typical of outboard powerhead operation. It is sold individually and is sized as a compact internal seal, making it a straightforward drop-in replacement during powerhead rebuilds, seal kit refreshes, or routine maintenance where the original seal has hardened, cracked, or begun leaking.\u003c\/p\u003e\u003cp\u003eBecause it carries the exact Sierra part number and cross-references directly to the original Chrysler Force equipment number, installers can order with confidence that they are getting a correct fit without needing to cross-check multiple aftermarket alternatives.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0586\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-99325 (Chrysler Force)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Powerhead Seals and O-Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 6.35 cm L x 10.16 cm W x 0.254 cm H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis seal is cataloged for Mercury outboard powerhead service and is the correct replacement for Chrysler Force outboard applications using OEM number 26-99325. No specific engine model or year range is specified for this part; confirm your original seal's OEM number matches 26-99325 before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-99325 (Chrysler Force)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0586 oil seal replace?\u003c\/strong\u003e Sierra 18-0586 replaces the Chrysler Force OEM number 26-99325, so any powerhead calling for that original equipment number will accept this seal as a direct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the 18-0586 seal fit?\u003c\/strong\u003e The 18-0586 seal is cataloged for Mercury outboard powerhead applications that originally used Chrysler Force part 26-99325; no specific engine model or year range is listed, so confirm your existing seal's OEM number matches before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0586 oil seal weigh?\u003c\/strong\u003e It weighs 0.01 pounds, reflecting its compact size as an internal powerhead seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-0586 seal?\u003c\/strong\u003e The seal itself measures 0.39 x 0.39 x 0.39 inches, and it ships in packaging measuring 6.35 cm L x 10.16 cm W x 0.254 cm H.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0586 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-0586 is a Sierra-manufactured aftermarket seal engineered as a direct cross-reference to Chrysler Force OEM number 26-99325, not an original Chrysler Force or Mercury part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-0586 oil seal manufactured?\u003c\/strong\u003e This seal is manufactured in Taiwan under Sierra's marine parts program.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package of the 18-0586?\u003c\/strong\u003e The 18-0586 is packaged and sold individually, with a package quantity of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-0586 seal and the original Chrysler Force seal?\u003c\/strong\u003e Functionally the 18-0586 is built to match the original Chrysler Force 26-99325 seal for fit and sealing performance; the main difference is that it is produced under the Sierra brand rather than the original Chrysler Force label.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0586 be used in a powerhead rebuild kit?\u003c\/strong\u003e Yes, the 18-0586 oil seal is suited to powerhead rebuild and maintenance work anywhere the Chrysler Force 26-99325 seal is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0586 seal include installation hardware?\u003c\/strong\u003e No, the 18-0586 is supplied as the seal component only, with a package quantity of 1 and no additional hardware included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-0586 is the correct seal for my outboard?\u003c\/strong\u003e Check the OEM number stamped on your existing seal or listed in your engine's parts manual against 26-99325; if it matches, Sierra 18-0586 is the correct replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083814619,"sku":"SIE-18-0586","price":11.56,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-0586__96423.1675866227.500.750.jpg?v=1785188924"},{"product_id":"sierra-18-0583-marine-oil-seal-for-honda-outboard-gearcase-replaces-26-43035-honda-91251-zw1-003","title":"Sierra 18-0583 Marine Oil Seal, Replaces 26-43035, 1.063 Inch Shaft","description":"\u003cp\u003eThe Sierra 18-0583 Marine Oil Seal is a precision-machined replacement seal designed for outboard and stern drive gearcase and drive applications, including Honda outboard gearcase and drive service. It seals the shaft bore to keep gear lubricant contained and water out, protecting internal gearcase components from contamination and lubricant loss. The seal is built to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice for gearcase rebuilds, lower unit service, and routine maintenance.\u003c\/p\u003e\u003cp\u003eWith an outer diameter of 1.496 inches (38 mm), a shaft size of 1.063 inches (27 mm), and a width of 0.197 inches (5 mm), the 18-0583 is sized for a specific gearcase bore and shaft combination, so confirming these dimensions against your existing seal or service manual before ordering is recommended. The seal carries a machined exterior finish for a consistent, reliable fit during installation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0583\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.496 inches (38 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 1.063 inches (27 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.197 inches (5 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282242732\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 26-43035\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Honda Outboard Gearcase and Drive Parts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for outboard gearcase and drive applications, including Honda outboard gearcase and drive service. Confirm the outer diameter, shaft size, and width against your unit before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-43035\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0583 oil seal fit?\u003c\/strong\u003e The Sierra 18-0583 is built for outboard gearcase and drive applications, including Honda outboard gearcase and drive service, and it should be matched to your unit by outer diameter, shaft size, and width before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the 18-0583 oil seal?\u003c\/strong\u003e It measures 1.496 inches (38 mm) outer diameter, 1.063 inches (27 mm) shaft size, and 0.197 inches (5 mm) width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0583 replace OEM part 26-43035?\u003c\/strong\u003e Yes, the Sierra 18-0583 is the cross-reference equivalent to OEM part number 26-43035.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0583 oil seal weigh?\u003c\/strong\u003e This oil seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0583 a genuine OEM part or aftermarket?\u003c\/strong\u003e It is a Sierra-brand aftermarket replacement seal engineered to meet or exceed the performance of the original equipment part it replaces, identified by OEM cross-reference 26-43035.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-0583 seal have?\u003c\/strong\u003e The Sierra 18-0583 has a machined exterior finish for a consistent, reliable fit during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-0583 seal for a gearcase rebuild?\u003c\/strong\u003e Yes, this seal is commonly used in gearcase and lower unit rebuilds and routine drive maintenance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0583?\u003c\/strong\u003e Each order includes one Sierra 18-0583 marine oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of parts does the 18-0583 belong to?\u003c\/strong\u003e The Sierra 18-0583 is categorized as a Honda outboard gearcase and drive part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-0583 is the correct seal for my gearcase?\u003c\/strong\u003e Compare the outer diameter (1.496 inches), shaft size (1.063 inches), and width (0.197 inches) of the 18-0583 against the seal currently installed in your gearcase or drive.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083847387,"sku":"SIE-18-0583","price":11.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0583_lg__96923.1558121272.500.750.jpg?v=1785188296"},{"product_id":"sierra-18-0595-oil-seal-for-mercury-outboard-powerhead-replaces-mercury-26-66303-1-125-in-od","title":"Sierra Oil Seal 18-0595, Replaces Mercury Marine 26-66303","description":"\u003cp\u003eThe Sierra 18-0595 is an oil seal engineered for Mercury outboard powerheads, providing a reliable barrier against oil leakage at the shaft. It is built with a 1.125 inch outer diameter and a 0.688 inch shaft size, sized to fit precisely into the powerhead seal bore it is designed for. At only 0.250 inches wide, it is a compact component intended to sit flush within its mounting location without interference from surrounding parts.\u003c\/p\u003e\u003cp\u003eThis seal directly replaces Mercury Marine part number 26-66303, making it a straightforward drop-in option for powerhead seal replacement and rebuild work. Sierra parts are constructed with quality materials aimed at delivering dependable service life and consistent sealing performance in the marine environment. The 18-0595 falls under Sierra's Mercury Outboard Powerhead Seals \u0026amp; O-Rings category, reflecting its specific application in outboard powerhead assemblies where maintaining oil containment is critical to engine protection.\u003c\/p\u003e\u003cp\u003eAt just 0.02 pounds, this is a small, lightweight part that is easy to keep on hand as a maintenance spare. Whether performing a full powerhead rebuild or addressing an isolated oil seal failure, the 18-0595 gives technicians and boat owners a Sierra-manufactured alternative to the OEM Mercury Marine part.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0595\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Powerhead Seals \u0026amp; O-Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.688 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282233983\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e Mercury Marine 26-66303\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury outboard powerheads using Mercury Marine oil seal 26-66303\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-66303\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0595 oil seal replace?\u003c\/strong\u003e The Sierra 18-0595 directly replaces Mercury Marine part number 26-66303, so it can be installed anywhere that Mercury Marine seal is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the outer diameter of the 18-0595 oil seal?\u003c\/strong\u003e The outer diameter is 1.125 inches, which is the size of the seal's outer edge that seats into the powerhead bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shaft size does this Sierra oil seal fit?\u003c\/strong\u003e It is sized for a 0.688 inch shaft, matching the shaft diameter it seals against on Mercury outboard powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow wide is the Sierra 18-0595 seal?\u003c\/strong\u003e 0.250 inches wide, a compact dimension intended to fit flush within its designated seal location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0595 oil seal weigh?\u003c\/strong\u003e It weighs 0.02 pounds, a very light single-component part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0595?\u003c\/strong\u003e The UPC is 808282233983, which can be used to confirm you are ordering the correct oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0595 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured replacement seal built to replace Mercury Marine 26-66303, not an OEM Mercury Marine part itself, though it is designed as a direct equivalent.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat application is the 18-0595 oil seal used on?\u003c\/strong\u003e It is listed under Mercury Outboard Powerhead Seals \u0026amp; O-Rings, indicating its use in Mercury outboard powerhead assemblies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when you order the 18-0595?\u003c\/strong\u003e Each order includes one Sierra 18-0595 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0595 suitable for a powerhead rebuild?\u003c\/strong\u003e Yes, its role as a powerhead seal replacing Mercury Marine 26-66303 makes it applicable to powerhead rebuild and repair work.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083945691,"sku":"SIE-18-0595","price":9.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0595_lg__09089.1558118637.500.750.jpg?v=1785189109"},{"product_id":"sierra-18-0614-marine-oil-pan-for-mercruiser-gm-big-block-v8-replaces-845668t-850458-811549-right-hand-dipstick","title":"Sierra 18-0614 Rear Main Seal, Replaces Mercruiser 845668T, for GM Big Block V8 (Right Handed Dipstick)","description":"\u003cp\u003eThe Sierra 18-0614 is a 1-piece rear main seal engineered for GM Big Block V8 marine engines equipped with a right-handed dipstick. Installed at the rear of the crankshaft where it meets the flywheel housing, this seal keeps engine oil contained and prevents leaks at one of the most common failure points on inboard and sterndrive engines. Its 1-piece design simplifies installation compared to older 2-piece seal setups, reducing the number of parting lines that can become a leak path over time.\u003c\/p\u003e\u003cp\u003eSierra builds this seal to fit as a direct equivalent for the Mercruiser rear main seals it replaces, so it installs using the same engine preparation and hardware as the original part. It is intended for use during rear main seal replacement, engine rebuilds, or any repair where oil is leaking from the rear of the crankshaft on a GM Big Block V8 marine engine with a right-handed dipstick configuration.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0614\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Rear Main Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Design:\u003c\/strong\u003e 1-piece\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e GM Big Block V8 (Right Handed Dipstick)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 13.63 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 845668T, 850458, 811549\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser GM Big Block V8 engines with right-handed dipstick configuration\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e845668T\u003c\/li\u003e\n\u003cli\u003e850458\u003c\/li\u003e\n\u003cli\u003e811549\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0614 rear main seal fit?\u003c\/strong\u003e The Sierra 18-0614 is designed for GM Big Block V8 marine engines with a right-handed dipstick configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0614 a 1-piece or 2-piece rear main seal?\u003c\/strong\u003e It is a 1-piece rear main seal, which uses a single continuous seal rather than two separate seal halves.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-0614 replace?\u003c\/strong\u003e It replaces Mercruiser rear main seal part numbers 845668T, 850458, and 811549.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-0614 work on a GM Big Block V8 with a left-handed dipstick?\u003c\/strong\u003e No. The 18-0614 is built for the right-handed dipstick configuration; GM Big Block V8 engines with a different dipstick placement require a different Sierra rear main seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0614 rear main seal weigh?\u003c\/strong\u003e The Sierra 18-0614 has a shipping weight of 13.63 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this rear main seal?\u003c\/strong\u003e Replacement is needed when oil is leaking from the rear of the crankshaft near the flywheel housing on a GM Big Block V8 marine engine, or during an engine rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0614 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-0614 is a Sierra-manufactured replacement seal designed to cross-reference directly to Mercruiser OEM numbers 845668T, 850458, and 811549.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes installing a 1-piece rear main seal require different tools than a 2-piece seal?\u003c\/strong\u003e The Sierra 18-0614's 1-piece design installs using standard rear main seal installation procedures for GM Big Block V8 engines; no special tools beyond standard seal installation are implied by its design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand makes the 18-0614 rear main seal?\u003c\/strong\u003e The 18-0614 is manufactured by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the Sierra 18-0614 to cross-reference a Mercruiser 850458 seal?\u003c\/strong\u003e Yes, Mercruiser 850458 is one of the OEM numbers the Sierra 18-0614 directly replaces.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084109531,"sku":"SIE-18-0614","price":354.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__36729.1753452632.500.750.jpg?v=1785188597"},{"product_id":"sierra-18-0612-marine-oil-pan-for-mercruiser-gm-small-block-v8-replaces-809910-14259-1-piece-rear-main-seal-rh-dipstick","title":"Sierra Rear Main Seal 18-0612 - Replaces Mercruiser 809910, 14259 - GM Small Block V8","description":"\u003cp\u003eThe Sierra 18-0612 is a one-piece rear main seal engineered for GM Small Block V8 engines built with a right-handed dipstick, as used in Mercruiser sterndrive applications. This seal fits between the engine block and the crankshaft flange at the rear of the engine, sealing the crankshaft bore to keep engine oil from leaking past the crankcase. Sierra manufactures the 18-0612 to OEM interchange standards so it installs as a direct equivalent without requiring modification, cross-referencing to Mercruiser OEM numbers 809910 and 14259.\u003c\/p\u003e\u003cp\u003eThe 18-0612 is one of several rear main seals in Sierra's lineup, each matched to a specific engine family and dipstick orientation. Because the correct seal depends on whether the block is GM Small Block, Big Block, or V6, and whether the dipstick is left- or right-handed, ordering the exact part number for your engine is important to get a proper seal. The 18-0612 is specifically the one-piece design for GM Small Block V8 engines with a right-handed dipstick.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Rear Main Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Type:\u003c\/strong\u003e 1-Piece\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Compatibility:\u003c\/strong\u003e GM Small Block V8 (Right Handed Dipstick)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 809910, 14259\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 7.48 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser sterndrive engines: GM Small Block V8 (Right Handed Dipstick)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e809910\u003c\/li\u003e\n\u003cli\u003e14259\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0612 rear main seal fit?\u003c\/strong\u003e The 18-0612 is a one-piece rear main seal built for GM Small Block V8 engines with a right-handed dipstick, as used in Mercruiser sterndrive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0612 a one-piece or two-piece seal?\u003c\/strong\u003e One piece. The 18-0612 uses a single-piece rear main seal design, while Sierra's 18-0613 is the two-piece version built for the same GM Small Block V8 engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM numbers does the 18-0612 replace?\u003c\/strong\u003e It replaces Mercruiser OEM numbers 809910 and 14259.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-0612 fit a GM Big Block V8?\u003c\/strong\u003e No. Big block V8 applications use Sierra 18-0614 (one-piece) or 18-0615 (two-piece); the 18-0612 is built specifically for GM Small Block V8 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the dipstick side matter for this seal?\u003c\/strong\u003e GM Small Block V8 engines are produced in both left- and right-handed dipstick configurations, and the 18-0612 is engineered for the right-handed dipstick version, so it must be matched to that configuration to seal properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0612 weigh?\u003c\/strong\u003e The Sierra 18-0612 rear main seal weighs 7.48 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-0612 is manufactured by Sierra to OEM specifications as a direct replacement for Mercruiser 809910 and 14259.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0612?\u003c\/strong\u003e Each order of the 18-0612 includes one rear main seal unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0612 work on a GM V6 engine?\u003c\/strong\u003e No. GM V6 engines use the separate Sierra 18-0616 rear main seal; the 18-0612 is designed only for GM Small Block V8 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercruiser engines use the 18-0612 seal?\u003c\/strong\u003e Mercruiser GM Small Block V8 engines with a right-handed dipstick use the 18-0612, which cross-references to OEM 809910 and 14259.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-0612 different from the 18-0614?\u003c\/strong\u003e The 18-0612 is the one-piece rear main seal for GM Small Block V8 engines, while the 18-0614 is the corresponding one-piece seal for GM Big Block V8 engines; the two are not interchangeable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0612 sold as a single seal?\u003c\/strong\u003e Yes, the Sierra 18-0612 rear main seal ships as a single unit weighing 7.48 pounds.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084338907,"sku":"SIE-18-0612","price":356.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-0612___20184.1753840673.500.750.jpg?v=1785188140"},{"product_id":"sierra-18-1211-two-piece-rear-main-seal-replaces-mercruiser-26-49947-omc-473424-fits-gm-2-5l-3-0l-inline-4-3l-v6-5-0l-5-7l-v8-marine-engines","title":"Sierra 18-1211 Two-Piece Rear Main Seal for 3.8L Marine Engines","description":"\u003cp\u003eThe Sierra 18-1211 is a two-piece rear main crankshaft seal designed to seal the rear of the crankshaft where it exits the engine block on applicable marine engines. It is built to meet or exceed the fit, form, and function of the original equipment seal it replaces, giving boat owners a dependable option when rebuilding an engine or addressing a rear main oil leak. The two-piece construction allows the seal to be installed around the crankshaft without full engine disassembly in many rebuild situations, which is a common design advantage over full-circle, one-piece seals that require the crankshaft to be pulled.\u003c\/p\u003e\u003cp\u003eThis seal is used on 3.8L marine engines, where it is paired with a separate oil pan gasket during a rear main seal service. It also cross-references to a wide range of OMC, Evinrude\/Johnson, Mercruiser, GLM, and Mallory rear main seal part numbers, making it a straightforward replacement for engines originally fitted with those components. As with all rear main seal jobs, a proper installation is important to prevent oil leaks at the rear of the crankcase, and the corresponding rear main crankshaft seal housing or block surface should be clean and free of damage before installation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1211\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Rear Main Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Two-Piece\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto Part Position:\u003c\/strong\u003e Rear\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Rear Main Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3.8L marine engine models\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 85490\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 473423\u003c\/li\u003e\n\u003cli\u003eMallory 9-61620\u003c\/li\u003e\n\u003cli\u003eMercruiser FI5110041\u003c\/li\u003e\n\u003cli\u003eMercruiser FI5110027\u003c\/li\u003e\n\u003cli\u003eMercruiser FI5110026\u003c\/li\u003e\n\u003cli\u003eMercruiser 26-49947\u003c\/li\u003e\n\u003cli\u003eMercruiser 26-58203\u003c\/li\u003e\n\u003cli\u003eMercruiser 26-814622\u003c\/li\u003e\n\u003cli\u003eOMC 473424\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1211 rear main seal fit?\u003c\/strong\u003e The Sierra 18-1211 is designed for 3.8L marine engine models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1211 a one-piece or two-piece seal?\u003c\/strong\u003e It is a two-piece rear main seal, which allows installation around the crankshaft without requiring full engine disassembly in many rebuild scenarios.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-1211 replace?\u003c\/strong\u003e This seal cross-references to GLM 85490, Evinrude\/Johnson 473423, Mallory 9-61620, Mercruiser FI5110041, FI5110027, FI5110026, 26-49947, 26-58203, and 26-814622, and OMC 473424.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any other gaskets when installing the 18-1211?\u003c\/strong\u003e On 3.8L models, the 18-1211 rear crank seal is used along with a separate oil pan gasket, part number 18-0362.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1211 rear main seal weigh?\u003c\/strong\u003e The Sierra 18-1211 weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1211 a genuine Sierra part or aftermarket equivalent?\u003c\/strong\u003e The 18-1211 is a Sierra-brand rear main seal manufactured to meet or exceed the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes included with part number 18-1211?\u003c\/strong\u003e The package includes one rear main seal, sold as a single unit (quantity 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is this seal located on the engine?\u003c\/strong\u003e The Sierra 18-1211 is installed at the rear position of the crankshaft, sealing the point where the crankshaft exits the rear of the engine block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-1211 replace a Mercruiser rear main seal?\u003c\/strong\u003e Yes, the 18-1211 cross-references to several Mercruiser part numbers, including FI5110041, FI5110027, FI5110026, 26-49947, 26-58203, and 26-814622.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-1211 fit OMC or Evinrude\/Johnson engines?\u003c\/strong\u003e It cross-references to OMC 473424 and Evinrude\/Johnson 473423, so it fits engines that originally used those rear main seals.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087025883,"sku":"SIE-18-1211","price":60.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1211_lg__43814.1722509909.500.750.jpg?v=1785188418"},{"product_id":"sierra-18-1213-forward-crankshaft-seal-timing-cover-seal-oem-26-11973-volvo-penta","title":"Sierra Timing Cover Seal 18-1213, Replaces 26-11973, Fits I\/L-6, V-6 4.3L, V-8 5.0L\/5.7L Marine Engines","description":"\u003cp\u003eThe Sierra 18-1213 is a timing cover seal engineered for marine sterndrive and inboard engines, sealing the timing cover against oil leakage where the front cover meets the engine block. It is built as a one-piece seal for standard rotation applications across a range of GM-based marine engine blocks, including 3.0L, 4.3L V-6, and 5.0L\/5.7L V-8 configurations, as well as inline six-cylinder engines. Because oil seals harden and shrink with age and heat cycling, the 18-1213 is a common preventive-maintenance and leak-repair replacement during timing cover service, front seal replacement, or engine rebuilds.\u003c\/p\u003e\u003cp\u003eFitment for the 18-1213 is tied to specific engine serial number breaks rather than a single universal application, so it covers 140\/3.0L and LX engines from serial number 6229718 and up, 150\/160\/165\/200 inline six-cylinder engines from serial number 1666495 and up (and again from 2770032 and up), 175\/185\/205\/262\/4.3L V-6 engines from serial number 6330183 and up, and 200 through 320 horsepower 5.0L\/5.7L\/898 V-8 engines from serial number 2453769 and up. It is also listed as the one-piece seal for standard-rotation 5.0L\/5.7L, 4.3L, and 3.0L applications. On several of these engine ranges, the 18-1213 is used alongside a companion seal, part number 18-1211, as part of the same timing cover service -- confirm your engine's serial number range to determine whether both seals are needed for your application.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1213\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Timing Cover Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Configuration:\u003c\/strong\u003e One-piece seal, standard rotation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-11973\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282242916\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e140\/3.0L \u0026amp; LX: engine serial number 6229718 and up\u003c\/li\u003e\n\u003cli\u003e150\/160\/165\/200 (I\/L-6): engine serial number 1666495 and up\u003c\/li\u003e\n\u003cli\u003e150\/160\/165\/200 (I\/L-6): engine serial number 2770032 and up\u003c\/li\u003e\n\u003cli\u003e175\/185\/205\/262\/4.3L (V-6): engine serial number 6330183 and up\u003c\/li\u003e\n\u003cli\u003e200\/228\/225\/230\/250\/255\/260\/270\/280\/300\/320\/5.0L\/5.7L\/898 (V-8): engine serial number 2453769 and up\u003c\/li\u003e\n\u003cli\u003e5.0L\/5.7L, 4.3L, 3.0L standard rotation, all, one-piece seal application\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-11973\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-1213 used for?\u003c\/strong\u003e The Sierra 18-1213 is a timing cover seal that seals the timing cover against oil leaks on marine sterndrive and inboard engines, and is typically replaced during timing cover service or when an engine develops a front oil leak.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-1213 timing cover seal fit?\u003c\/strong\u003e It fits 140\/3.0L and LX engines from serial number 6229718 and up, 150\/160\/165\/200 inline six-cylinder engines from serial number 1666495 and up (and from 2770032 and up), 175\/185\/205\/262\/4.3L V-6 engines from serial number 6330183 and up, and 200 through 320 horsepower 5.0L\/5.7L\/898 V-8 engines from serial number 2453769 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-1213 is the correct seal for my engine, or if I need 18-1211 too?\u003c\/strong\u003e Fitment for the 18-1213 depends on your engine's serial number range; on several of the listed engine ranges it is used together with a companion seal, part number 18-1211, as part of the same timing cover job, so check your engine's serial number to confirm whether both are required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1213 the same as OEM part 26-11973?\u003c\/strong\u003e The Sierra 18-1213 cross-references to OEM part number 26-11973, making it a direct aftermarket equivalent for that application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1213 seal?\u003c\/strong\u003e The 18-1213 timing cover seal measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1213 timing cover seal weigh?\u003c\/strong\u003e It weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1213 a one-piece or two-piece seal?\u003c\/strong\u003e For standard-rotation 5.0L\/5.7L, 4.3L, and 3.0L applications, the 18-1213 is specified as a one-piece seal, simplifying installation compared to split-seal designs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1213 fit V-6 and V-8 marine engines?\u003c\/strong\u003e Yes, the 18-1213 covers 175\/185\/205\/262\/4.3L V-6 engines from serial number 6330183 and up, as well as 200 through 320 horsepower 5.0L\/5.7L\/898 V-8 engines from serial number 2453769 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-1213?\u003c\/strong\u003e Ordering the 18-1213 provides one timing cover seal, part number 18-1213, for the engine serial number range and configuration that matches your application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1213 genuine Sierra or a generic aftermarket part?\u003c\/strong\u003e The 18-1213 is a genuine Sierra part, identified by manufacturer part number 18-1213, and cross-references directly to OEM part 26-11973.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does fitment for the 18-1213 depend on engine serial numbers instead of model year?\u003c\/strong\u003e Timing cover seal changes on these marine engines were made at specific production points identified by engine serial number rather than by model year, so the 18-1213's coverage is defined by serial number breaks such as 6229718 and up or 2453769 and up.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087189723,"sku":"SIE-18-1213","price":31.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1213_lg__75351.1558121639.500.750.jpg?v=1785188308"},{"product_id":"water-seal-damper-647-44366-00-for-yamaha-6-8-9-9-15-hp-outboards-f9-9-f15-t9-9","title":"Sierra Water Seal Damper 18-1834 for Yamaha F9.9, FT9.9, T9.9 Outboard Motors","description":"\u003cp\u003eThe Sierra 18-1834 is a water seal damper built for the cooling system of specific Yamaha 4-stroke outboard motors. It is designed as the dedicated damper seal component in the water pump assembly, positioned separately from the impeller, cup plate, housing, and cover kit parts that make up the rest of the pump. Buyers looking to service the cooling system on a covered Yamaha F9.9, FT9.9, or T9.9 outboard can order this part on its own without needing to replace the full housing or cover kit.\u003c\/p\u003e\u003cp\u003eThis water seal damper carries the Sierra manufacturer part number 18-1834 and fits Yamaha F9.9 outboards from model years 1985-05, FT9.9 outboards from model years 1985-90, and T9.9 outboards from model years 1985-05. Because it is cataloged as a standalone damper seal rather than part of a kit, it is a targeted fix for cooling system service where the housing, cup plate, and cover do not need replacement.\u003c\/p\u003e\u003cp\u003eThe part weighs 1 pound and is categorized as an engine part for the cooling system. Confirm your outboard's model designation (F9.9, FT9.9, or T9.9) and model year against the fitment listed below before ordering, since Yamaha's water pump components differ across model years and designations.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1834\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Seal Damper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Engine Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282312015\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Yamaha F9.9 (1985-05), FT9.9 (1985-90), T9.9 (1985-05)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha F9.9, model years 1985-05\u003c\/li\u003e\n\u003cli\u003eYamaha FT9.9, model years 1985-90\u003c\/li\u003e\n\u003cli\u003eYamaha T9.9, model years 1985-05\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1834 water seal damper fit?\u003c\/strong\u003e It fits Yamaha F9.9 outboards from model years 1985-05, Yamaha FT9.9 outboards from model years 1985-90, and Yamaha T9.9 outboards from model years 1985-05.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-1834 a Sierra part number?\u003c\/strong\u003e Yes, 18-1834 is the Sierra manufacturer part number for this water seal damper.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1834 damper seal fit a Yamaha F9.9?\u003c\/strong\u003e Yes, it fits the Yamaha F9.9 for model years 1985-05.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-1834 fit a Yamaha FT9.9 outboard?\u003c\/strong\u003e Yes, the Sierra 18-1834 water seal damper fits the Yamaha FT9.9 for model years 1985-90.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-1834 work on a Yamaha T9.9?\u003c\/strong\u003e Yes, it fits the Yamaha T9.9 for model years 1985-05.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat part of the outboard does the water seal damper belong to?\u003c\/strong\u003e The 18-1834 is a cooling system component, specifically the damper seal used in the water pump assembly of the covered Yamaha outboard models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1834 water seal damper weigh?\u003c\/strong\u003e It weighs 1 pound.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1834 a complete water pump kit or just the seal?\u003c\/strong\u003e The 18-1834 is a standalone damper seal, listed separately from the housing, cup plate, and water pump cover kit parts for these Yamaha models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-1834 fit more than one Yamaha outboard model?\u003c\/strong\u003e Yes, the same Sierra 18-1834 water seal damper is listed for three Yamaha designations: F9.9, FT9.9, and T9.9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does the 18-1834 water seal damper fall under?\u003c\/strong\u003e It is categorized as an engine part, specifically for the outboard cooling system.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088959195,"sku":"SIE-18-1834","price":1.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1834__88818.1558184624.500.750.jpg?v=1785329192"},{"product_id":"sierra-18-2001-oil-seal-for-omc-evinrude-330137-outboard-prop-driveshaft-seal","title":"Sierra 18-2001 Oil Seal, Replaces OEM 330137","description":"\u003cp\u003eThe Sierra 18-2001 is an oil seal designed as a direct replacement component for marine drivetrain applications where OEM part 330137 is specified. Oil seals like this one prevent lubricant loss and block water intrusion at rotating shaft points, protecting gearcase and lower unit components from corrosion and premature wear. Sierra manufactures this seal to match the fit and function of the original equipment part it replaces, making it a straightforward swap when the factory seal has hardened, cracked, or begun leaking.\u003c\/p\u003e\u003cp\u003eThis is a compact, lightweight component at 0.03 pounds with item dimensions of 5 x 4 x 1 inches, consistent with a single shaft seal rather than a multi-piece kit. It carries UPC 030999309471 and ships as one unit (quantity 1). Because seals of this type are wear items, keeping a genuine-fit replacement like the Sierra 18-2001 on hand simplifies routine maintenance and helps avoid unplanned downtime from a failed seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 330137\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 5 x 4 x 1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e NPT 3\/4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Service Type:\u003c\/strong\u003e Personal Watercraft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309471\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eSpecific make, horsepower, and model-year fitment were not detailed in this listing. Confirm compatibility by matching OEM number 330137 against your engine or lower unit's original seal before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e330137\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2001 oil seal replace?\u003c\/strong\u003e The Sierra 18-2001 oil seal is a direct replacement for OEM part number 330137.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this oil seal weigh?\u003c\/strong\u003e The Sierra 18-2001 oil seal weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2001?\u003c\/strong\u003e This oil seal measures 5 x 4 x 1 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2001 a genuine Sierra part or a generic aftermarket seal?\u003c\/strong\u003e It is manufactured and sold under the Sierra brand as part number 18-2001, built to match the fit of the original 330137 seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in the package?\u003c\/strong\u003e The Sierra 18-2001 ships as a single oil seal, quantity 1 per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2001 have a threaded fitting?\u003c\/strong\u003e Yes, the listed thread size for this oil seal is NPT 3\/4 inch.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2001 oil seal?\u003c\/strong\u003e The UPC is 030999309471.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-2001 fit my specific engine or model?\u003c\/strong\u003e Exact make, horsepower, and model fitment were not specified for the Sierra 18-2001; the best way to confirm fit is to match OEM number 330137 against the seal currently installed in your application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat vehicle type is the Sierra 18-2001 intended for?\u003c\/strong\u003e This seal is listed for personal watercraft service applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace an oil seal like the 18-2001?\u003c\/strong\u003e Oil seals harden and crack with age and heat cycling, which can let lubricant escape or allow water to enter the gearcase; replacing a worn seal with the Sierra 18-2001 restores that seal against leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the OEM 330137 seal still the correct one to cross-reference?\u003c\/strong\u003e Yes, OEM 330137 is the cross-reference number for the Sierra 18-2001 oil seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090073307,"sku":"SIE-18-2001","price":10.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2001__84864.1722514942.500.750.jpg?v=1785187986"},{"product_id":"sierra-18-2002-oil-seal-replaces-mercury-26-76868-honda-91252-zw1-003-omc-320862-43mm-od-marine-oil-seal","title":"Sierra Oil Seal 18-2002, Replaces Honda 91252-ZW1-003, Mercury Marine 26-76868, OMC 320862","description":"\u003cp\u003eThe Sierra 18-2002 is a small oil seal engineered for outboard prop and driveshaft applications where a compact, precise seal is needed to keep gear lube in and water out. It is a round-profile seal sized for a 1.692 inch (43 mm) outer diameter and a 1.188 inch (30.2 mm) shaft, with a 0.250 inch (6.4 mm) width, making it a direct fit wherever those exact dimensions are called for. Sierra lists this seal as a universal fit part, meaning it is sized to the seal cavity itself rather than to one specific engine model, so it can be used across outboard and drive applications that share this bore, shaft, and width combination.\u003c\/p\u003e\u003cp\u003eConstruction is a standard round oil seal design intended to hold up to marine gear-case conditions and repeated duty cycles. It ships as a single seal (one count) ready to install during a lower-unit or driveshaft service, and it cross-references directly to Honda, Mercury Marine, and OMC part numbers, so it is a straightforward replacement when servicing engines built around those OEM seals.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2002\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop \u0026amp; Driveshaft Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.692 inches (43 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 1.188 inches (30.2 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.250 inches (6.4 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309488\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUniversal fit sized to the 1.692 inch outer diameter, 1.188 inch shaft, and 0.250 inch width seal cavity; not restricted to a single engine model.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHonda 91252-ZW1-003\u003c\/li\u003e\n\u003cli\u003eMercury Marine 26-76868\u003c\/li\u003e\n\u003cli\u003eOMC 320862\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2002 oil seal used for?\u003c\/strong\u003e The Sierra 18-2002 is a small oil seal used in outboard prop and driveshaft applications to keep gear lube contained and water out of the lower unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2002 fit my outboard?\u003c\/strong\u003e It is a universal fit seal sized to a 1.692 inch outer diameter, 1.188 inch shaft, and 0.250 inch width, so the 18-2002 fits any application that uses that exact seal cavity size rather than being limited to one engine model.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2002 replace a Honda oil seal?\u003c\/strong\u003e Yes, the Sierra 18-2002 cross-references directly to Honda part number 91252-ZW1-003.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2002 the same as Mercury Marine 26-76868?\u003c\/strong\u003e Yes, Mercury Marine 26-76868 is one of the OEM numbers the Sierra 18-2002 oil seal cross-references to.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this seal cross to an OMC part number?\u003c\/strong\u003e Yes, OMC 320862 is listed as an equivalent to the Sierra 18-2002 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2002 oil seal?\u003c\/strong\u003e The seal measures 1.692 inches (43 mm) outer diameter, 1.188 inches (30.2 mm) shaft size, and 0.250 inches (6.4 mm) in width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2002 oil seal weigh?\u003c\/strong\u003e The Sierra 18-2002 oil seal weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-2002 seal?\u003c\/strong\u003e It is a round oil seal, as listed under the 18-2002 part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in one order of 18-2002?\u003c\/strong\u003e Each order of the Sierra 18-2002 includes one oil seal (unit count of 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2002 an OEM or aftermarket part?\u003c\/strong\u003e The 18-2002 is a Sierra-branded replacement seal that cross-references to OEM Honda, Mercury Marine, and OMC part numbers, making it a direct aftermarket equivalent rather than an OEM-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the 18-2002?\u003c\/strong\u003e The Sierra 18-2002 is categorized as an outboard prop and driveshaft seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090106075,"sku":"SIE-18-2002","price":11.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2002_lg__37035.1558121848.500.750.jpg?v=1785188121"},{"product_id":"oil-seal-118-2009-for-mercruiser-replaces-oem-26-892361","title":"Sierra Oil Seal 18-2009 for MerCruiser R\/MR\/Alpha One and Alpha One SS Stern Drives","description":"\u003cp\u003eThe Sierra 18-2009 is an oil seal engineered as a direct-fit component for MerCruiser stern drive units. It is installed within the stern drive housing to retain lubricating oil and keep water and contaminants out of the gear case, protecting internal gears and bearings from premature wear and moisture intrusion. One seal is required per stern drive installation.\u003c\/p\u003e\u003cp\u003eThis seal is designed for MerCruiser R\/MR\/Alpha One stern drives with a beginning serial number of 6225577 and up, MerCruiser Alpha One SS stern drives across all serial numbers, and MerCruiser I stern drives with serial numbers between 1534570 and 1684187. Confirm your stern drive model and serial number range before ordering to ensure correct fitment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2009\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MerCruiser Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309556\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 1 per stern drive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Stern Drive Models:\u003c\/strong\u003e R\/MR\/Alpha One (Serial Number 6225577 and Up); Alpha One SS (All Serial Numbers); I (Serial Number 1534570 to 1684187)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser R\/MR\/Alpha One - Serial Number 6225577 and Up\u003c\/li\u003e\n\u003cli\u003eMerCruiser Alpha One SS - All Serial Numbers\u003c\/li\u003e\n\u003cli\u003eMerCruiser I - Serial Number 1534570 to 1684187\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2009 oil seal used for?\u003c\/strong\u003e The Sierra 18-2009 is an oil seal installed in a MerCruiser stern drive housing to retain gear case lubricant and block water and debris from entering, protecting the internal gears and bearings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich MerCruiser stern drives fit the 18-2009 oil seal?\u003c\/strong\u003e Sierra 18-2009 fits MerCruiser R\/MR\/Alpha One stern drives with serial number 6225577 and up, MerCruiser Alpha One SS stern drives across all serial numbers, and MerCruiser I stern drives with serial numbers between 1534570 and 1684187.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my stern drive is compatible with part number 18-2009?\u003c\/strong\u003e Check your stern drive model designation and serial number tag; 18-2009 is built for R\/MR\/Alpha One units serial 6225577 and up, all Alpha One SS units, and MerCruiser I units serial 1534570 to 1684187.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many of the 18-2009 seal do I need per stern drive?\u003c\/strong\u003e One Sierra 18-2009 oil seal is required per stern drive installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2009 oil seal weigh?\u003c\/strong\u003e The Sierra 18-2009 oil seal weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2009 an OEM or aftermarket part?\u003c\/strong\u003e Sierra 18-2009 is an aftermarket replacement oil seal manufactured to fit the specified MerCruiser stern drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2009 oil seal?\u003c\/strong\u003e The UPC for Sierra part number 18-2009 is 030999309556.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2009 seal fit Alpha One SS stern drives with any serial number?\u003c\/strong\u003e Yes, Sierra 18-2009 fits MerCruiser Alpha One SS stern drives across all serial numbers, not just a limited range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-2009 fit a MerCruiser I stern drive outside the 1534570 to 1684187 serial range?\u003c\/strong\u003e No, for MerCruiser I stern drives the Sierra 18-2009 oil seal is specified for serial numbers between 1534570 and 1684187 only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-2009 oil seal a job for a professional?\u003c\/strong\u003e Installing the Sierra 18-2009 oil seal involves disassembling the stern drive housing, so many boat owners have this done by a qualified marine mechanic to avoid damaging the seal or housing during installation.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090171611,"sku":"SIE-18-2009","price":10.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2009__38593.1722502011.500.750.jpg?v=1785329174"},{"product_id":"oil-seal-for-evinrude-outboard-replaces-omc-313284-18-2005","title":"Sierra Oil Seal 18-2005, Replaces 313284, for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra Oil Seal 18-2005 is a direct-replacement oil seal designed for Evinrude outboard prop and driveshaft applications. It is built to restore a proper seal at the prop shaft or driveshaft housing, helping keep gear lubricant contained and water out of the lower unit. As a direct replacement for OEM part number 313284, this seal is intended for boat owners and marine technicians performing lower unit service, gearcase rebuilds, or prop shaft seal replacement on compatible Evinrude outboards.\u003c\/p\u003e\u003cp\u003eThis is a compact, lightweight component at just 0.03 pounds, sized to fit precisely in place of the original equipment seal it replaces. Using the correct Sierra part number ensures the seal matches the dimensions and sealing characteristics required for a proper gearcase seal, which is critical to preventing water intrusion and gear oil leakage that can lead to costly lower unit damage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282257668\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard prop and driveshaft applications\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e313284\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2005 oil seal replace?\u003c\/strong\u003e It is a direct replacement for OEM part number 313284.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat outboards is the 18-2005 oil seal designed for?\u003c\/strong\u003e This seal is designed for Evinrude outboard prop and driveshaft applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this oil seal weigh?\u003c\/strong\u003e The Sierra 18-2005 oil seal weighs 0.03 pounds, a small, lightweight sealing component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2005 the same as OEM part 313284?\u003c\/strong\u003e Yes, Sierra 18-2005 is manufactured as a direct equivalent to OEM number 313284 for the same application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is this seal typically installed?\u003c\/strong\u003e It seals at the prop shaft or driveshaft area of the outboard lower unit, part of the Evinrude prop and driveshaft seal group.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use part number 313284 to cross-reference this product?\u003c\/strong\u003e Yes, 313284 is the OEM number that Sierra part 18-2005 replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an OEM or aftermarket part?\u003c\/strong\u003e The 18-2005 is a Sierra-branded aftermarket seal manufactured to replace the OEM 313284 part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the driveshaft or prop shaft seal need to be replaced?\u003c\/strong\u003e A worn or failed seal like the one replaced by Sierra 18-2005 can allow water into the gearcase or let gear oil leak out, so replacing it during lower unit service protects the outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering the 18-2005 seal?\u003c\/strong\u003e Ordering the Sierra 18-2005 gets you the single oil seal component listed under that part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this seal fit other outboard brands besides Evinrude?\u003c\/strong\u003e The Sierra 18-2005 oil seal is designated for Evinrude outboard prop and driveshaft applications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090204379,"sku":"SIE-18-2005","price":11.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2005__90715.1722361282.500.750.jpg?v=1785329174"},{"product_id":"sierra-18-2013-oil-seal-for-mercury-outboard-powerhead-replaces-mercury-marine-26-16977-crankshaft-seal","title":"Sierra Oil Seal 18-2013, Replaces Mercury Marine 26-16977, MerCruiser Alpha I SS and Stern Drive I","description":"\u003cp\u003eThe Sierra 18-2013 is a white oil seal built for MerCruiser stern drive applications, sealing against oil and water intrusion at the drive unit. It is a direct cross-reference to Mercury Marine part 26-16977, making it a straightforward replacement when the original seal fails or wears out during routine drive maintenance.\u003c\/p\u003e\u003cp\u003eThis seal fits the MerCruiser Alpha I SS stern drive (all serial numbers) at the water pump base\/upper location, and the MerCruiser Stern Drive Model I (serial number range 1534570 to 1684187) at the water pump location. Confirm your drive model and serial number range before ordering, since stern drive seals are serial-number specific and installing the wrong seal can lead to leaks or premature failure.\u003c\/p\u003e\u003cp\u003eThe seal is round in shape and finished in white. It ships in compact packaging (2.5 H x 1.3 L x 2.5 W centimeters) and weighs 0.01 pounds, reflecting its small, single-component size. As with any drive seal, replacement is typically done during a water pump service or lower-unit rebuild, and Sierra recommends replacing seals rather than reusing old ones whenever the drive is opened up.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2013\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 2.5 H x 1.3 L x 2.5 W centimeters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309594\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 26-16977\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser Alpha I SS Stern Drive (all serial numbers)\u003c\/li\u003e\n\u003cli\u003eMerCruiser Stern Drive Model I, serial numbers 1534570 to 1684187\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 26-16977\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2013 oil seal fit?\u003c\/strong\u003e The Sierra 18-2013 fits the MerCruiser Alpha I SS stern drive across all serial numbers, and the MerCruiser Stern Drive Model I within serial number range 1534570 to 1684187.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2013 the same as Mercury Marine 26-16977?\u003c\/strong\u003e Yes, the Sierra 18-2013 is a direct cross-reference to Mercury Marine part number 26-16977 and can be used in its place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2013 oil seal?\u003c\/strong\u003e It is white, and round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2013 oil seal weigh?\u003c\/strong\u003e 0.01 pounds, consistent with its small, single-piece seal design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2013 seal work on any MerCruiser stern drive?\u003c\/strong\u003e No. It is specific to the MerCruiser Alpha I SS (all serial numbers) and Stern Drive Model I within the 1534570 to 1684187 serial number range; buyers should confirm their drive's serial number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere on the drive does the 18-2013 seal install?\u003c\/strong\u003e On the Alpha I SS it installs at the water pump base\/upper location, and on the Stern Drive Model I it installs at the water pump location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering part 18-2013?\u003c\/strong\u003e One Sierra 18-2013 oil seal is included per unit ordered.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2013 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-branded oil seal manufactured as a replacement part, cross-referenced to Mercury Marine 26-16977.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-2013 seal?\u003c\/strong\u003e The packaged seal measures 2.5 H x 1.3 L x 2.5 W centimeters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2013 oil seal made?\u003c\/strong\u003e It is made in Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the 18-2013 oil seal be replaced?\u003c\/strong\u003e This seal is typically replaced during water pump service or a lower-unit rebuild on the applicable MerCruiser stern drive, rather than reusing the old seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090368219,"sku":"SIE-18-2013","price":12.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2013__17433.1780061442.500.750.jpg?v=1785188237"},{"product_id":"sierra-18-2022-oil-seal-replaces-omc-303345-evinrude-johnson-outboard-prop-driveshaft-seal","title":"Sierra 18-2022 Oil Seal - Replaces OMC 303345 for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2022 Oil Seal is a direct-fit replacement seal engineered for Evinrude outboard prop and driveshaft applications. This small bolt-on component seals against water and lubricant loss around the driveshaft, protecting the gearcase from water intrusion and helping maintain proper lubrication at the seal interface. It is designed as a drop-in equivalent for the OMC 303345 seal, making it a straightforward swap during gearcase service, lower unit rebuilds, or routine seal replacement.\u003c\/p\u003e\u003cp\u003eInstallation is bolt-on and does not require special tools beyond standard seal installation practice. Because seals are wear items that harden and lose sealing ability over time, replacing the 18-2022 at the first sign of water intrusion or oil seepage helps prevent more costly gearcase damage. Each unit is sold individually and is intended for one seal position per the catalog listing quantity.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2022\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop and Driveshaft Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity per Package:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309686\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Evinrude outboard prop and driveshaft applications that use the OMC 303345 oil seal.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 303345\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2022 oil seal fit?\u003c\/strong\u003e The Sierra 18-2022 is designed for Evinrude outboard prop and driveshaft applications that originally used the OMC 303345 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2022 seal equivalent to an OMC part?\u003c\/strong\u003e Yes, the Sierra 18-2022 replaces OMC part number 303345 and is built as a direct functional equivalent for that position.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The Sierra 18-2022 oil seal measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2022 oil seal weigh?\u003c\/strong\u003e This seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2022 oil seal installed?\u003c\/strong\u003e Installation is bolt-on, meaning the seal presses or bolts into place in the gearcase without requiring modification to surrounding components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in one package?\u003c\/strong\u003e One Sierra 18-2022 oil seal is included per package, matching a one-per-position replacement need.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the 18-2022 oil seal?\u003c\/strong\u003e This seal should be replaced when water intrusion, oil seepage, or gearcase leaks are noticed, or during a scheduled lower unit or gearcase service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2022 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-2022 oil seal is 030999309686.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2022 a genuine OMC part or aftermarket?\u003c\/strong\u003e The Sierra 18-2022 is a Sierra-branded aftermarket seal manufactured to replace the OMC 303345 oil seal, not an OMC-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of Evinrude parts does the 18-2022 belong to?\u003c\/strong\u003e It is listed under Evinrude outboard prop and driveshaft seals, reflecting its use at the driveshaft\/prop seal position on Evinrude outboards.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090400987,"sku":"SIE-18-2022","price":20.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2022__60838.1722351139.500.750.jpg?v=1785188146"},{"product_id":"sierra-18-2014-oil-seal-for-mercury-outboard-powerhead-replaces-26-817472-26-89238","title":"Sierra Oil Seal 18-2014, Replaces Mercury Marine 26-89238, Fits R\/MR and Alpha I Stern Drives","description":"\u003cp\u003eThe Sierra Oil Seal 18-2014 is a round, white oil seal engineered as a direct replacement for the oil seal used in specific stern drive applications. It is listed with an oil seal description code of WPB,L and is supplied one per package. This seal is a precision-fit replacement part designed to restore proper sealing where the original equipment seal has worn out, hardened, or begun to leak, helping protect stern drive components from water intrusion and lubricant loss.\u003c\/p\u003e\u003cp\u003eSierra part number 18-2014 is a direct cross-reference for Mercury Marine part number 26-89238, so boat owners and marine technicians can order it as a drop-in equivalent to the original Mercury Marine seal. It is designed for use on R and MR stern drives equipped with Alpha I lower units from serial number 6225577 and up, as well as Alpha I SS stern drives across all serial numbers. Because stern drive seal applications vary by serial number range and drive model, confirming the drive model and serial number before ordering helps ensure the correct seal is installed.\u003c\/p\u003e\u003cp\u003eThe seal is compact and lightweight, consistent with its role as a small sealing component within the stern drive water pump base assembly area. Its white finish and round shape are as supplied by the manufacturer.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2014\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Seal Description Code:\u003c\/strong\u003e WPB,L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 12.9 cm H x 0.4 cm L x 9.8 cm W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Per Application:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309600\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e Mercury Marine 26-89238\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eR and MR stern drives with Alpha I, serial number 6225577 and up\u003c\/li\u003e\n\u003cli\u003eAlpha I SS stern drives, all serial numbers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 26-89238\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does Sierra oil seal 18-2014 replace?\u003c\/strong\u003e Sierra 18-2014 is a direct cross-reference for Mercury Marine part number 26-89238, so it can be ordered as an equivalent replacement for that original seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich stern drives use the 18-2014 oil seal?\u003c\/strong\u003e This seal fits R and MR stern drives equipped with Alpha I from serial number 6225577 and up, as well as Alpha I SS stern drives across all serial numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package?\u003c\/strong\u003e The Sierra 18-2014 oil seal is supplied one per package, listed at a quantity of 1 per application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2014 seal?\u003c\/strong\u003e It is white, and it has a round shape as supplied by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2014 oil seal weigh?\u003c\/strong\u003e The seal weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-2014 oil seal?\u003c\/strong\u003e The package measures 12.9 cm H x 0.4 cm L x 9.8 cm W.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs my stern drive serial number important when ordering this seal?\u003c\/strong\u003e Yes. Sierra 18-2014 is specified for R\/MR stern drives with Alpha I from serial number 6225577 and up, so checking your drive's serial number against that range helps confirm fit; Alpha I SS stern drives are covered at all serial numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2014 an OEM or aftermarket seal?\u003c\/strong\u003e It is a Sierra-branded aftermarket seal manufactured as a cross-reference replacement for Mercury Marine 26-89238, not an original Mercury Marine part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2014 oil seal?\u003c\/strong\u003e The UPC for Sierra oil seal 18-2014 is 030999309600.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes part number 18-2014 fit Bravo I stern drives?\u003c\/strong\u003e No. Sierra 18-2014 is specified for R\/MR stern drives with Alpha I and for Alpha I SS stern drives; Bravo I applications use a different Sierra oil seal part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the WPB,L designation on the 18-2014 seal?\u003c\/strong\u003e WPB,L is the oil seal description code Sierra assigns to part number 18-2014 in its stern drive application listings.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090433755,"sku":"SIE-18-2014","price":15.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2014__95073.1722378445.500.750.jpg?v=1785189080"},{"product_id":"sierra-18-2026-oil-seal-replaces-omc-321453-for-evinrude-johnson-outboard-prop-shaft-driveshaft","title":"Sierra 18-2026 Oil Seal, Replaces OMC 321453, for Evinrude\/OMC Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2026 is a nitrile oil seal engineered for Evinrude and OMC outboard prop and driveshaft applications. It is built to maintain a reliable barrier against water intrusion and lubricant loss at the driveshaft and propeller shaft interface, helping protect the lower unit gearcase from corrosion and premature wear. The seal is molded from solid nitrile material in a white finish, sized to install as a direct replacement in the gearcase housing where the original equipment seal has hardened, cracked, or begun to leak. Nitrile construction offers good resistance to marine gear lubricants, saltwater, and the temperature swings typical of outboard lower unit service, making it a durable choice for routine gearcase maintenance and seal replacement work. This seal directly interchanges with OMC part number 321453 and cross-references to Mallory number 9-76203, giving installers a straightforward way to confirm fit when working from an OEM or Mallory part number instead of the Sierra number. It ships as a single seal, ready to be pressed into the gearcase during a standard lower unit service or seal kit replacement. Because gearcase seals are wear items that should be replaced any time the lower unit is opened up, keeping the correct Sierra 18-2026 on hand is a practical step for anyone maintaining an Evinrude or OMC outboard prop and driveshaft assembly.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2026\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Nitrile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Form:\u003c\/strong\u003e Solid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 5 x 4.02 x 0.98 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309723\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Evinrude Outboard Prop and Driveshaft Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 321453; Mallory 9-76203\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Evinrude and OMC outboard prop and driveshaft seal applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 321453\u003c\/li\u003e\n\u003cli\u003eMallory 9-76203\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2026 oil seal replace?\u003c\/strong\u003e The Sierra 18-2026 is a direct replacement for OMC part number 321453 and cross-references to Mallory number 9-76203, so it can be ordered using any of these part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2026 used for?\u003c\/strong\u003e It is an oil seal designed for Evinrude and OMC outboard prop and driveshaft applications, sealing the gearcase to keep water out and lubricant in.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2026 seal made from?\u003c\/strong\u003e It is made from solid nitrile, a material chosen for its resistance to marine gear lubricants, saltwater exposure, and the temperature range seen in outboard lower units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2026 oil seal?\u003c\/strong\u003e The Sierra 18-2026 oil seal is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2026?\u003c\/strong\u003e The Sierra 18-2026 measures 5 x 4.02 x 0.98 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2026 oil seal weigh?\u003c\/strong\u003e This oil seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2026 an OEM part or aftermarket?\u003c\/strong\u003e The 18-2026 is a Sierra-branded aftermarket seal manufactured to replace OMC 321453 and cross-reference to Mallory 9-76203, rather than an OEM OMC or Mallory part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package?\u003c\/strong\u003e The Sierra 18-2026 is sold as a single oil seal, one unit per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the Mallory 9-76203 number to find this part?\u003c\/strong\u003e Yes, Mallory number 9-76203 cross-references directly to the Sierra 18-2026 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2026 seal fit my Evinrude or OMC outboard?\u003c\/strong\u003e The Sierra 18-2026 is designed for Evinrude and OMC outboard prop and driveshaft seal applications; confirm fit using the OMC 321453 or Mallory 9-76203 cross-reference numbers for your specific gearcase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2026 oil seal installed?\u003c\/strong\u003e It presses into the gearcase housing at the prop shaft or driveshaft bore as part of a standard lower unit seal replacement, typically done whenever the gearcase is opened for service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does this seal need to be replaced periodically?\u003c\/strong\u003e Gearcase seals like the Sierra 18-2026 wear and can harden or crack over time, which allows water intrusion or lubricant loss, so replacing them during routine lower unit service helps prevent gearcase damage.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090466523,"sku":"SIE-18-2026","price":13.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2026__98585.1722512704.500.750.jpg?v=1785189180"},{"product_id":"sierra-18-2023-oil-seal-for-evinrude-johnson-omc-outboards-replaces-omc-313282-prop-driveshaft-seal","title":"Sierra Oil Seal 18-2023 for Evinrude\/OMC Outboards, Replaces 313282","description":"\u003cp\u003eThe Sierra 18-2023 Oil Seal is a replacement oil seal built for Evinrude and OMC outboard prop and driveshaft applications. It is a small, precision-machined seal designed to keep gearcase lubricant contained while blocking water intrusion at the driveshaft, protecting internal gears and bearings from corrosion and premature wear. With an outer diameter of 1.062 inches, a shaft size of 0.554 inches, and a width of 0.312 inches, the 18-2023 is sized to drop into the same location as the original equipment seal it replaces, cross-referencing directly to OEM number 313282. Its machined exterior finish supports a consistent, leak-resistant fit against the housing bore. This seal is typically used during gearcase service, driveshaft seal replacement, or lower unit rebuilds where the original seal has hardened, cracked, or begun to weep lubricant. Because it is sold as an individual component, it also appears as a listed content item within Sierra water pump kit assemblies that call for this seal as part of a complete rebuild. At just 0.02 pounds, it ships compact and is easy to add alongside other gearcase maintenance parts. Buyers replacing a leaking oil seal on an Evinrude or OMC outboard driveshaft can use the 18-2023 as a direct fit for the original 313282 seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2023\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.062 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.554 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.312 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309693\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 313282\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Evinrude and OMC outboard prop and driveshaft seal applications; also used as a component within Sierra water pump kit assemblies for these outboards.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e313282\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2023 oil seal fit?\u003c\/strong\u003e The 18-2023 is designed for Evinrude and OMC outboard prop and driveshaft seal applications, and it also appears as a component seal within Sierra water pump kit assemblies for these outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2023 cross-reference to an OEM part number?\u003c\/strong\u003e Yes, the Sierra 18-2023 oil seal cross-references directly to OEM number 313282.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The 18-2023 measures 1.062 inches outer diameter, 0.554 inches shaft size, and 0.312 inches in width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2023 oil seal weigh?\u003c\/strong\u003e This Sierra oil seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish on the 18-2023 seal?\u003c\/strong\u003e The Sierra 18-2023 oil seal has a machined exterior finish for a consistent fit in the housing bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2023 a genuine aftermarket replacement or OEM part?\u003c\/strong\u003e The 18-2023 is a Sierra aftermarket replacement seal manufactured to replace OEM number 313282, not an original OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this oil seal?\u003c\/strong\u003e This seal should be replaced when it hardens, cracks, or begins leaking gearcase lubricant, typically during a driveshaft seal replacement or lower unit rebuild on an Evinrude or OMC outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2023 sold as a standalone seal or only as part of a kit?\u003c\/strong\u003e The 18-2023 oil seal is sold as an individual replacement part, and it is also listed as a content item within Sierra water pump kit assemblies for outboards that call for this seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2023?\u003c\/strong\u003e Ordering the Sierra 18-2023 gets you one oil seal sized 1.062 inches OD by 0.554 inches shaft by 0.312 inches width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this seal require any special tools to install?\u003c\/strong\u003e The listing for the Sierra 18-2023 oil seal does not specify special tools; standard gearcase seal installation practices apply when fitting this driveshaft seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090499291,"sku":"SIE-18-2023","price":15.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/51qL22h-r2L.jpg?v=1784389531"},{"product_id":"sierra-18-2016-oil-seal-replaces-omc-313992-evinrude-johnson-outboard-prop-driveshaft-seal-1-187-in-id-x-1-875-in-od-x-0-250-in","title":"Sierra 18-2016 Oil Seal for Evinrude Outboard Motors, Replaces OMC 313992 and Mercury Marine 26-41953","description":"\u003cp\u003eThe Sierra 18-2016 Oil Seal is a direct-fit replacement oil seal engineered for Evinrude outboard motors, covering a wide range of horsepower ratings from 85 hp through 110 hp across multiple serial number ranges and cylinder configurations (3-cylinder, 4-cylinder, and 6-cylinder blocks). This seal is a wear item that keeps gear case and powerhead lubricants contained while blocking water intrusion at the shaft, protecting internal components from corrosion and premature failure. It is built from a glass-filled seal material for durability in a marine environment, with a green-brown finish. The seal measures 5 x 4 x 1 inches as packaged and weighs 0.04 pounds, making it a small, precision-fit component rather than a bulk part. Because Evinrude used many serial number breakpoints across the 85-110 hp model years, buyers should confirm their engine's serial number against the ranges listed below before ordering to ensure correct fitment, including the two distinct upper O-ring configurations (round vs. Square) used on later 100 hp four-cylinder units. Sierra 18-2016 cross-references directly to Mercury Marine 26-41953 and OMC 313992, so it is a suitable replacement wherever either of those part numbers is called for.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2016\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Green Brown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 5 x 4 x 1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309624\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 26-41953, OMC 313992\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e85 hp (850), 6-cylinder, serial 1460999-1464848\u003c\/li\u003e\n\u003cli\u003e85 hp (850), 6-cylinder, serial 1566240-1766823\u003c\/li\u003e\n\u003cli\u003e85 hp (850), 4-cylinder, serial 3493913-4831998\u003c\/li\u003e\n\u003cli\u003e90 hp (900), 6-cylinder, serial 1766824-1869775\u003c\/li\u003e\n\u003cli\u003e90 hp (90, 900), 6-cylinder, serial 4845301 and up\u003c\/li\u003e\n\u003cli\u003e90 hp, 3-cylinder, serial A996142-B240450\u003c\/li\u003e\n\u003cli\u003e90 hp, 3-cylinder, serial B240451-C221999\u003c\/li\u003e\n\u003cli\u003e90 hp, 3-cylinder, serial C222000 and up\u003c\/li\u003e\n\u003cli\u003e95 hp (950), 6-cylinder, serial 1869776-2318585\u003c\/li\u003e\n\u003cli\u003e100 hp (1000), 6-cylinder, serial 1464949-2318585\u003c\/li\u003e\n\u003cli\u003e100 hp (1000SS), 6-cylinder, serial 2318586-2413847\u003c\/li\u003e\n\u003cli\u003e100 hp (1000SS), 6-cylinder, serial 2484633-2836018\u003c\/li\u003e\n\u003cli\u003e100 hp (1000BP), 6-cylinder, serial 2399698-2641854\u003c\/li\u003e\n\u003cli\u003e100 hp (1000BP), 6-cylinder, serial 2641855-3253111\u003c\/li\u003e\n\u003cli\u003e100 hp, 4-cylinder, serial B209468-G760299\u003c\/li\u003e\n\u003cli\u003e100 hp, 4-cylinder with round upper O-ring, serial G760300 and up\u003c\/li\u003e\n\u003cli\u003e100 hp, 4-cylinder with square upper O-ring, serial G760300 and up\u003c\/li\u003e\n\u003cli\u003e110 hp (1100), serial 1870201-2314955\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 26-41953\u003c\/li\u003e\n\u003cli\u003eOMC 313992\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2016 oil seal fit?\u003c\/strong\u003e The Sierra 18-2016 fits Evinrude outboard motors from 85 hp through 110 hp, spanning 3-cylinder, 4-cylinder, and 6-cylinder engine blocks across specific serial number ranges, so confirming your engine's serial number against the listed ranges is the best way to verify fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2016 the same as Mercury 26-41953?\u003c\/strong\u003e Yes, Sierra 18-2016 cross-references directly to Mercury Marine 26-41953, so it can be used as a replacement wherever that Mercury number is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-2016 replace OMC 313992?\u003c\/strong\u003e It does. OMC 313992 is a direct cross-reference to the Sierra 18-2016 oil seal, making it a suitable substitute for that OMC part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The Sierra 18-2016 oil seal measures 5 x 4 x 1 inches and weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-2016 seal made from?\u003c\/strong\u003e This oil seal is made from a glass-based seal material and has a green-brown finish typical of Sierra's oil seal line.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a pack?\u003c\/strong\u003e The Sierra 18-2016 is sold as a single oil seal, one unit per pack.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMy 100 hp Evinrude has serial number G760300, which upper O-ring version do I need?\u003c\/strong\u003e Evinrude 100 hp four-cylinder engines with serial number G760300 and up were built with either a round upper O-ring or a square upper O-ring configuration; you will need to identify which O-ring style your engine uses to pair the Sierra 18-2016 seal correctly, since both configurations reference this same part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-2016 is a genuine Sierra-branded oil seal, manufactured to the same specification as the OEM Mercury Marine 26-41953 and OMC 313992 seals it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this seal?\u003c\/strong\u003e Ordering the Sierra 18-2016 includes one oil seal; it does not include gaskets, O-rings, or other gear case hardware unless separately listed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy are there multiple serial number ranges listed for the same part number?\u003c\/strong\u003e Evinrude revised internal components across production, so the Sierra 18-2016 oil seal was specified for several distinct serial number breakpoints on the 85 hp through 110 hp engines even though the seal itself carries one part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-2016 work on 3-cylinder 90 hp Evinrude motors?\u003c\/strong\u003e Yes, the Sierra 18-2016 covers 3-cylinder 90 hp Evinrude engines across serial ranges A996142-B240450, B240451-C221999, and C222000 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this seal fit a 110 hp Evinrude?\u003c\/strong\u003e The Sierra 18-2016 fits the 110 hp (1100) Evinrude within serial number range 1870201-2314955.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090532059,"sku":"SIE-18-2016","price":11.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2016__82574.1722350151.500.750.jpg?v=1785188854"},{"product_id":"sierra-18-2028-oil-seal-replaces-omc-321480-evinrude-omc-outboard-prop-driveshaft","title":"Sierra Oil Seal 18-2028, Replaces OMC 321480, for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2028 Oil Seal is a replacement oil seal engineered for Evinrude outboard prop and driveshaft applications. It is designed as a direct equivalent to OMC part number 321480, giving boat owners and technicians a reliable way to restore a proper seal without sourcing increasingly hard-to-find original equipment parts. The seal has a machined exterior finish for a precise, consistent fit against the mating surfaces it seals.\u003c\/p\u003e\u003cp\u003eThis is a compact, lightweight component at just 0.02 pounds, sized to fit into the prop and driveshaft seal area of the outboard lower unit. Keeping this seal in good condition helps prevent water intrusion and lubricant loss around the driveshaft and propeller shaft, both of which can lead to gear case damage if left unaddressed. Because it is a direct OEM cross-reference part, it installs the same way the original 321480 seal did, using standard hand tools and typical lower-unit service procedures.\u003c\/p\u003e\u003cp\u003eThe 18-2028 is intended for outboard owners performing routine lower unit maintenance, seal replacement during a gear case rebuild, or repair work after a water intrusion issue is diagnosed. It is manufactured in China and shipped as a single seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2028\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 321480\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 0.508 H x 4.572 L x 3.302 W (centimeters)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Evinrude outboard prop and driveshaft seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309747\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard prop and driveshaft seal application\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 321480\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2028 oil seal replace?\u003c\/strong\u003e The Sierra 18-2028 is a direct cross-reference to OMC part number 321480, so it can be used anywhere that original seal was specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2028 used for?\u003c\/strong\u003e It is an oil seal used in the prop and driveshaft area of Evinrude outboard lower units, sealing against water intrusion and lubricant loss.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2028 oil seal weigh?\u003c\/strong\u003e It weighs 0.02 pounds, making it a small, lightweight lower-unit seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2028 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-2028 is a Sierra-branded replacement part manufactured to cross-reference OMC 321480, sold as a Sierra aftermarket equivalent rather than an OMC-branded original.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-2028 seal have?\u003c\/strong\u003e This oil seal has a machined exterior finish for a precise fit at the sealing surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2028 oil seal manufactured?\u003c\/strong\u003e The 18-2028 oil seal is manufactured in China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2028 come as a single seal or a set?\u003c\/strong\u003e The Sierra 18-2028 is supplied as a single oil seal, not a multi-piece kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-2028 seal?\u003c\/strong\u003e The Sierra 18-2028 ships in packaging measuring 0.508 cm high by 4.572 cm long by 3.302 cm wide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2028 fit any outboard other than Evinrude?\u003c\/strong\u003e The Sierra 18-2028 is listed under Evinrude outboard prop and driveshaft seal applications; fitment outside that application is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know I need to replace this oil seal?\u003c\/strong\u003e Signs like water in the lower unit lubricant or lubricant leaking from the driveshaft or prop shaft area typically indicate the oil seal, such as the Sierra 18-2028, needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2028 include installation hardware?\u003c\/strong\u003e No, the 18-2028 is the oil seal itself; no additional hardware is included in the package.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090597595,"sku":"SIE-18-2028","price":16.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2028__60195.1722366087.500.750.jpg?v=1785188986"},{"product_id":"sierra-18-2029-oil-seal-replaces-omc-321481-evinrude-johnson-outboard-prop-driveshaft-seal","title":"Sierra Oil Seal 18-2029, Replaces 321480, Evinrude Outboard Prop \u0026 Driveshaft Seal","description":"\u003cp\u003eThe Sierra 18-2029 is an oil seal built for Evinrude outboard prop and driveshaft seal applications. Its role is to keep water out and lubricant in around the driveshaft and propeller shaft area of the lower unit, protecting internal gearcase components from water intrusion and preventing lubricant loss that can lead to premature wear or corrosion. The seal has a machined exterior finish for a precise, consistent fit against the shaft and housing bore it seals against. It is manufactured in Taiwan and is compact, with product dimensions of 0.39 x 0.39 x 0.39 inches and a shipped weight of 0.02 pounds, so it ships and installs easily as a small, targeted repair part rather than a full assembly replacement. Because it is designed as a direct-fit replacement for the original equipment seal, it restores the sealing function of the lower unit without requiring modification to surrounding components. This seal is commonly kept on hand for scheduled lower unit service, gearcase rebuilds, or as part of a repair when water intrusion or lubricant leakage is diagnosed at the driveshaft or prop shaft seal location.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2029\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop \u0026amp; Driveshaft Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309754\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 5.13 inches L x 4.0 inches W x 1.25 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 321480\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThe Sierra 18-2029 is used in Evinrude outboard prop and driveshaft seal applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003e321480\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2029 oil seal fit?\u003c\/strong\u003e The Sierra 18-2029 is used in Evinrude outboard prop and driveshaft seal applications, sealing the driveshaft or propeller shaft area of the lower unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2029 replace?\u003c\/strong\u003e It replaces OEM part number 321480, making it a direct cross-reference for that Evinrude seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The Sierra 18-2029 oil seal measures 0.39 x 0.39 x 0.39 inches as shipped in its individual product form.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2029 oil seal weigh?\u003c\/strong\u003e This oil seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2029 manufactured?\u003c\/strong\u003e The Sierra 18-2029 oil seal is manufactured in Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2029 a genuine Evinrude part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-2029 is an aftermarket seal manufactured by Sierra as a cross-reference replacement for OEM number 321480, not an original Evinrude-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-2029 seal have?\u003c\/strong\u003e It has a machined exterior finish for a precise fit at the sealing surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-2029?\u003c\/strong\u003e Ordering Sierra 18-2029 gets you one oil seal for Evinrude outboard prop and driveshaft seal applications; it does not include gaskets or other lower unit hardware unless listed separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2029 stop water intrusion in the lower unit?\u003c\/strong\u003e Yes, as an oil seal for the driveshaft and prop shaft area, the 18-2029 is designed to keep water out of the gearcase and retain lubricant inside it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2029 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-2029 is 030999309754.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2029 a small or full-size replacement part?\u003c\/strong\u003e At 0.39 x 0.39 x 0.39 inches and 0.02 pounds, the 18-2029 is a small, single-component oil seal rather than a full lower unit assembly.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090630363,"sku":"SIE-18-2029","price":13.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2029__01179.1722490668.500.750.jpg?v=1785188227"},{"product_id":"sierra-18-2032-oil-seal-replaces-omc-321788-evinrude-johnson-outboard-prop-shaft-driveshaft-seal","title":"Sierra Oil Seal 18-2032, Replaces OMC 321788, Evinrude Outboard Prop and Driveshaft Seal","description":"\u003cp\u003eThe Sierra 18-2032 is an oil seal built for Evinrude outboard prop and driveshaft applications. It seals the shaft bore against water intrusion and lubricant loss, protecting the gear case and driveshaft components from corrosion and premature wear. The seal has a machined exterior finish and is sized to a 1.000 inch outer diameter, a 0.500 inch shaft size, and a 0.188 inch width, making it a precise fit for the driveshaft bore it is designed to seal.\u003c\/p\u003e\u003cp\u003eThis is a small, low-cost wear part that is commonly replaced during gear case service, driveshaft seal replacement, or lower unit rebuilds. It is sold as a direct-fit replacement carrying the Sierra part number 18-2032 and cross-references to OMC part number 321788, so it can be ordered using either number.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2032\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.188 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309785\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e OMC 321788\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard prop and driveshaft applications\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e321788\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2032 oil seal fit?\u003c\/strong\u003e The 18-2032 is designed for Evinrude outboard prop and driveshaft applications, sealing the driveshaft bore in the gear case.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2032 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-branded oil seal, part number 18-2032, sold as a direct cross-reference replacement rather than an OMC-branded original.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM number does this seal replace?\u003c\/strong\u003e This seal cross-references to OMC part number 321788, so either number can be used to order the correct part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2032 oil seal?\u003c\/strong\u003e The seal measures 1.000 inch outer diameter, 0.500 inch shaft size, and 0.188 inch width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2032 oil seal weigh?\u003c\/strong\u003e It weighs 0.03 pounds, consistent with a small single-component seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-2032 have?\u003c\/strong\u003e The seal has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2032 as a direct replacement without modification?\u003c\/strong\u003e Yes, the 18-2032 is a direct-fit replacement for the Evinrude driveshaft bore it is designed for, using the OMC 321788 cross-reference.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2032 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-2032 oil seal is 030999309785.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2032 come as a single seal or a kit?\u003c\/strong\u003e It is sold as a single oil seal, part number 18-2032, quantity one per application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the 18-2032 oil seal typically installed?\u003c\/strong\u003e It is installed in the driveshaft bore of the gear case on applicable Evinrude outboard prop and driveshaft assemblies.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090663131,"sku":"SIE-18-2032","price":7.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2032__79847.1722507654.500.750.jpg?v=1785188160"},{"product_id":"sierra-18-2035-oil-seal-replaces-omc-evinrude-327031-outboard-prop-driveshaft-seal","title":"Sierra 18-2035 Oil Seal, Replaces OMC 327031, for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2035 Oil Seal is a direct-fit replacement seal designed for Evinrude outboard prop and driveshaft applications. It is built from durable metal with a machined finish, giving it the dimensional accuracy needed to maintain a reliable barrier against water intrusion and lubricant loss at the driveshaft and propeller shaft area of the lower unit. Keeping this seal in good condition is important for protecting the gear case from water contamination, which can lead to corrosion and premature bearing or gear failure if left unaddressed.\u003c\/p\u003e\u003cp\u003eThis seal carries the OMC 327031 cross-reference number, making it a straightforward replacement for boat owners servicing older Evinrude lower units where that part number is called for. The compact size (5.13 inches long, 4.0 inches wide, 1.25 inches high) and light 0.02-pound weight reflect its role as a small but critical sealing component rather than a structural part. It ships as a single oil seal unit, ready to be installed as part of routine lower unit maintenance or a full seal kit replacement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2035\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop and Driveshaft Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\/Brown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 5.13 inches L x 4.0 inches W x 1.25 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309815\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 oil seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Evinrude outboard prop and driveshaft applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 327031\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2035 oil seal replace?\u003c\/strong\u003e The Sierra 18-2035 oil seal is a direct cross-reference for OMC part number 327031, so it can be used wherever that OEM number is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2035 used for?\u003c\/strong\u003e It is an oil seal for Evinrude outboard prop and driveshaft applications, sealing against water intrusion and lubricant loss in the lower unit around the driveshaft and propeller shaft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2035 seal made from?\u003c\/strong\u003e This oil seal is made from metal with a machined finish, in a black\/brown color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2035 oil seal weigh?\u003c\/strong\u003e The 18-2035 oil seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2035 oil seal?\u003c\/strong\u003e The seal measures 5.13 inches long, 4.0 inches wide, and 1.25 inches high.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in one package?\u003c\/strong\u003e Each package of the Sierra 18-2035 contains one oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2035 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-2035 is a Sierra-branded replacement seal that cross-references to OMC 327031, rather than an OMC-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2035 oil seal fit my Evinrude outboard's lower unit?\u003c\/strong\u003e The 18-2035 is designated for Evinrude outboard prop and driveshaft applications where the OMC 327031 seal is called for; check that number against your outboard's parts diagram to confirm fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the driveshaft oil seal need to be replaced?\u003c\/strong\u003e A worn or damaged oil seal like the 18-2035 can allow water into the lower unit or let lubricant escape, both of which can lead to gear case corrosion and bearing or gear damage if not corrected.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2035 come with installation hardware or a gasket?\u003c\/strong\u003e No, the 18-2035 package includes only the oil seal itself; gaskets and other lower unit hardware are separate parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2035 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-2035 oil seal is 030999309815.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090695899,"sku":"SIE-18-2035","price":9.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2035__79018.1722500133.500.750.jpg?v=1785189002"},{"product_id":"sierra-18-2045-oil-seal-volvo-penta-833996-12-x-24-x-7-mm-stern-drive-seal","title":"Sierra 18-2045 Oil Seal for Volvo Penta Stern Drive, White","description":"\u003cp\u003eThe Sierra 18-2045 is a marine oil seal engineered for Volvo Penta stern drive applications. This white, round seal is built to meet or exceed original equipment quality, giving boat owners a reliable replacement for maintaining a proper seal against oil leakage in the stern drive assembly. Sierra manufactures its seals to close tolerances so fit and sealing performance match what the stern drive was originally designed for, helping prevent oil loss and water intrusion that can damage internal drive components over time.\u003c\/p\u003e\u003cp\u003eThis seal cross-references directly to the OEM Volvo part number, making it a straightforward like-for-like replacement for boaters servicing their stern drive as part of routine maintenance or a leak repair. Its compact, lightweight design (0.01 pounds) reflects its role as a precision sealing component rather than a structural part, and it is intended to be installed exactly where the original OEM seal was located.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2045\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Volvo Penta Stern Drive\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVolvo Penta stern drive\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVolvo 827247-8\u003c\/li\u003e\n\u003cli\u003eGLM 70640\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 0581419\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 0580422\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2045 used for?\u003c\/strong\u003e The Sierra 18-2045 is an oil seal designed for Volvo Penta stern drive units, sealing the drive to prevent oil leakage and water intrusion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this seal fit Volvo Penta stern drives only?\u003c\/strong\u003e Yes, the 18-2045 oil seal is designed specifically for Volvo Penta stern drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2045 replace?\u003c\/strong\u003e It replaces Volvo OEM part number 827247-8, along with GLM 70640 and Evinrude\/Johnson 0581419 and 0580422.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2045 a genuine Volvo part or aftermarket?\u003c\/strong\u003e The 18-2045 is a Sierra aftermarket seal manufactured to meet or exceed original equipment quality, not a genuine Volvo-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2045 oil seal?\u003c\/strong\u003e The Sierra 18-2045 oil seal is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-2045 seal?\u003c\/strong\u003e It is round in shape, consistent with standard stern drive oil seal designs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2045 weigh?\u003c\/strong\u003e The 18-2045 oil seal weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2045 be used to fix an oil leak in a stern drive?\u003c\/strong\u003e Yes, replacing a worn seal with the Sierra 18-2045 is a common way to resolve an oil leak in a Volvo Penta stern drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Evinrude\/Johnson 0581419 seal the same as the Sierra 18-2045?\u003c\/strong\u003e The Sierra 18-2045 is interchangeable with Evinrude\/Johnson 0581419 and 0580422, meaning it can be used as a direct replacement for those numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-2045?\u003c\/strong\u003e The order includes one Sierra 18-2045 oil seal for Volvo Penta stern drive applications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090728667,"sku":"SIE-18-2045","price":13.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2045__70493.1722512845.500.750.jpg?v=1785188854"},{"product_id":"sierra-18-2047-oil-seal-35mm-id-x-55mm-od-x-10mm-replaces-oem-946242","title":"Sierra Oil Seal 18-2047 - Replaces Volvo 958860-9","description":"\u003cp\u003eThe Sierra 18-2047 Oil Seal is a precision-machined replacement seal designed for marine drive and lower unit applications where a reliable oil barrier is required. It is built to prevent lubricant leakage and keep contaminants such as water out of gear housings, helping protect internal components from premature wear and corrosion. This seal is manufactured with a machined exterior finish for a consistent, accurate fit against the housing bore, and it is engineered to directly replace the Volvo 958860-9 seal, making it a straightforward swap for boat owners and marine technicians performing routine maintenance or seal replacement during a rebuild.\u003c\/p\u003e\u003cp\u003eAt just 0.06 pounds, this is a compact, lightweight component sized for tight tolerances typical of drive and gearcase seals. Sierra sources and manufactures its parts to consistent quality standards, and this seal carries a Taiwan country of origin. Whether you are servicing a lower unit, replacing a worn seal that has started to leak, or completing a full gearcase rebuild, the 18-2047 is sized and finished to restore a proper seal without modification.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2047\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Volvo 958860-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDirect cross-reference replacement for Volvo 958860-9.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVOLVO 958860-9\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2047 oil seal fit?\u003c\/strong\u003e The Sierra 18-2047 is a direct cross-reference replacement for Volvo 958860-9, so it fits wherever that Volvo seal is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2047 the same as Volvo part 958860-9?\u003c\/strong\u003e Yes, Sierra 18-2047 is manufactured as a direct equivalent to Volvo 958860-9 and can be used as a replacement for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2047 oil seal weigh?\u003c\/strong\u003e This oil seal weighs 0.06 pounds, making it a small, lightweight component typical of gearcase and drive seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2047 seal?\u003c\/strong\u003e The seal measures 0.39 x 0.39 x 0.39 inches, a compact size sized to seat directly in the original housing bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish on this seal?\u003c\/strong\u003e The Sierra 18-2047 has a machined exterior finish, which provides a precise, consistent fit against the mounting bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2047 oil seal manufactured?\u003c\/strong\u003e The country of origin for the 18-2047 oil seal is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-2047 is a Sierra-branded part manufactured as a cross-reference replacement for the OEM Volvo 958860-9 seal, not a copy sold under the original OEM label.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2047?\u003c\/strong\u003e Ordering the Sierra 18-2047 includes one oil seal; no additional hardware or gaskets are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this seal be used during a lower unit rebuild?\u003c\/strong\u003e Yes, the Sierra 18-2047 is suited for use when rebuilding a gearcase or lower unit that originally used the Volvo 958860-9 seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace this oil seal?\u003c\/strong\u003e An oil seal like the 18-2047 is typically replaced when it begins leaking gear lubricant or allowing water intrusion into the housing, both signs of a worn or failed seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091252955,"sku":"SIE-18-2047","price":34.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2047__22023.1722515193.500.750.jpg?v=1785188896"},{"product_id":"sierra-18-2060-prop-shaft-oil-seal-for-omc-sterndrive-cobra-stern-drive-replaces-omc-321467","title":"Sierra 18-2060 Oil Seal for OMC Sterndrive and Cobra Stern Drive, White","description":"\u003cp\u003eThe Sierra 18-2060 is a marine oil seal engineered for OMC Sterndrive and Cobra Stern Drive applications. It seals the driveshaft and exhaust housing area, helping keep water out and lubricant in around the drive's rotating shaft interfaces. Built by Sierra to meet or exceed original equipment quality standards, this white, round oil seal is a direct-fit replacement designed to restore a proper seal where the original unit has hardened, cracked, or begun to leak.\u003c\/p\u003e\u003cp\u003eSierra manufactures this seal to the same specifications as the original equipment it replaces, so installers can expect the same fit, sealing performance, and durability as the factory part. At just 0.02 pounds, it is a small, precise component that is easy to handle during a driveshaft or exhaust housing service, and it cross-references directly to several OEM and aftermarket part numbers used across OMC-based sterndrive service records.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2060\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310118\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e OMC Sterndrive and Cobra Stern Drive\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for OMC Sterndrive and Cobra Stern Drive applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 86060\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 0321467\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 303804\u003c\/li\u003e\n\u003cli\u003eMallory 9-76206\u003c\/li\u003e\n\u003cli\u003eOMC 321467\u003c\/li\u003e\n\u003cli\u003eOMC 303804\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2060 oil seal fit?\u003c\/strong\u003e The Sierra 18-2060 is designed for OMC Sterndrive and Cobra Stern Drive applications, sealing the driveshaft and exhaust housing area of the drive unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2060 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-2060 is manufactured by Sierra as a replacement oil seal built to meet or exceed original equipment quality, rather than being sourced from OMC directly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM and cross-reference numbers does part 18-2060 replace?\u003c\/strong\u003e Part number 18-2060 cross-references to GLM 86060, Evinrude\/Johnson 0321467, Evinrude\/Johnson 303804, Mallory 9-76206, OMC 321467, and OMC 303804.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2060 oil seal weigh?\u003c\/strong\u003e This Sierra oil seal weighs 0.02 pounds, reflecting its small, compact seal design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and shape is the Sierra 18-2060 seal?\u003c\/strong\u003e It is a round, white oil seal, part number 18-2060.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-2060 oil seal made from?\u003c\/strong\u003e The 18-2060 is made from a glass material as listed for this Sierra oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the OMC 321467 seal work as a replacement for the Sierra 18-2060?\u003c\/strong\u003e Yes, OMC 321467 is one of the OEM numbers that the Sierra 18-2060 cross-references and is intended to replace.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box with the 18-2060?\u003c\/strong\u003e The 18-2060 ships as a single oil seal unit, one per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-2060 be used on Cobra Stern Drive units?\u003c\/strong\u003e Yes, the 18-2060 is intended for OMC Sterndrive and Cobra Stern Drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs fitment guaranteed across all OMC-based drives with the 18-2060?\u003c\/strong\u003e The 18-2060 is fit specific, so it is important to confirm the existing OEM or cross-reference part number, such as OMC 321467 or 303804, before ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091285723,"sku":"SIE-18-2060","price":13.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2060__05040.1753202319.500.750.jpg?v=1785188938"},{"product_id":"sierra-18-2049-upper-drive-shaft-housing-oil-seal-replaces-mercury-26-32511-2-005-in-od","title":"Sierra 18-2049 Oil Seal, Replaces Mercury Marine 26-32511, Fits Stern Drive Models 485, 888, 898\/228","description":"\u003cp\u003eThe Sierra 18-2049 Oil Seal is a white oil seal built as a direct equivalent to the Mercury Marine 26-32511 seal used in stern drive gear case assemblies. It measures 2.005 inches in outer diameter, fits a 1.250 inch shaft, and has a width of 0.388 inches, making it a precise fit for the applications it is designed to replace.\u003c\/p\u003e\u003cp\u003eThis seal is used in the gear case oil seal position (listed as position code GC in the parts breakdown) on stern drive units. It is designed to keep gear lubricant contained around the rotating shaft while keeping water out of the gear case, protecting internal gears and bearings from water intrusion and lubricant loss. Replacing a worn or hardened oil seal at this position is a routine maintenance step whenever a stern drive gear case is opened for service, or when gear lube is found to be milky or contaminated with water.\u003c\/p\u003e\u003cp\u003eThe Sierra 18-2049 is confirmed for use on stern drive models identified as 485, 888, and 898\/228, each tied to specific serial number ranges. Always confirm your unit's serial number falls within the applicable range before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2049\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 2.005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 1.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.388 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Shape:\u003c\/strong\u003e Rectangular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 26-32511\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282257682\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStern drive model 485, serial number 4893835 and up\u003c\/li\u003e\n\u003cli\u003eStern drive model 888, serial number 3106717 and up\u003c\/li\u003e\n\u003cli\u003eStern drive model 898\/228, serial number 4782330 to 6225576\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 26-32511\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2049 oil seal replace?\u003c\/strong\u003e The Sierra 18-2049 is a direct equivalent to Mercury Marine part number 26-32511, so it can be used wherever that OEM number is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The 18-2049 has an outer diameter of 2.005 inches, a shaft size of 1.250 inches, and a width of 0.388 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich stern drive models is the 18-2049 designed for?\u003c\/strong\u003e This seal is listed for stern drive models 485 (serial number 4893835 and up), 888 (serial number 3106717 and up), and 898\/228 (serial number 4782330 to 6225576).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my unit falls in the correct serial number range?\u003c\/strong\u003e Check the serial number tag on your stern drive unit against the ranges listed for the 18-2049: 4893835-and-up for model 485, 3106717-and-up for model 888, or 4782330 to 6225576 for model 898\/228.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or a generic aftermarket seal?\u003c\/strong\u003e The 18-2049 is a Sierra branded oil seal, manufactured as a direct replacement for the Mercury Marine 26-32511 rather than a generic universal seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2049 seal?\u003c\/strong\u003e This oil seal is white in color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat position does this seal install in on the gear case?\u003c\/strong\u003e Within the stern drive parts breakdown, the 18-2049 is listed at the gear case oil seal position (position code GC).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-2049 myself?\u003c\/strong\u003e Replacing the 18-2049 gear case oil seal is typically done whenever the stern drive gear case housing is opened for service, and it should be seated to the correct depth to seal properly around the 1.250 inch shaft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2049 come with any additional hardware or seals?\u003c\/strong\u003e The 18-2049 is supplied as a single oil seal only; it does not include other gear case seals such as the 18-2056 or 18-2003 sometimes used in the same assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2049 weigh?\u003c\/strong\u003e The 18-2049 oil seal weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace this seal?\u003c\/strong\u003e A worn or hardened 18-2049 oil seal can allow water into the gear case or let gear lubricant escape, so it is commonly replaced if lubricant appears milky or the seal shows visible wear.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091351259,"sku":"SIE-18-2049","price":17.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2049__77604.1722372549.500.750.jpg?v=1785188167"},{"product_id":"sierra-18-2062-lower-oil-seal-replaces-omc-evinrude-329922-outboard-gearcase-driveshaft-seal","title":"Sierra 18-2062 Oil Seal - Replaces OMC 329923","description":"\u003cp\u003eThe Sierra 18-2062 is a precision oil seal built to the OMC 329923 specification, used to retain lubricant and keep out water and debris at a rotating shaft interface. It is manufactured with a machined exterior finish for a consistent, reliable sealing surface at the housing bore.\u003c\/p\u003e\u003cp\u003eThis seal is sized with a 1.375 inch outer diameter, a 0.875 inch shaft size, and a 0.207 inch width, matching the dimensions of the original OMC 329923 seal it replaces. Because it is built to the OEM 329923 specification, it installs as a direct, drop-in replacement without modification. At 0.02 pounds, it is a small, lightweight component intended for straightforward replacement during routine maintenance or seal repair.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2062\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e OMC 329923\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.207 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 329923\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2062 oil seal replace?\u003c\/strong\u003e OMC 329923 is the OEM number the Sierra 18-2062 oil seal replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The 18-2062 measures 1.375 inches outer diameter, 0.875 inch shaft size, and 0.207 inch width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2062 weigh?\u003c\/strong\u003e 0.02 pounds is the weight of the Sierra 18-2062 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish on this seal?\u003c\/strong\u003e Machined is the exterior finish on the Sierra 18-2062 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or a generic copy?\u003c\/strong\u003e The 18-2062 is a genuine Sierra International oil seal, built to the OMC 329923 specification rather than a generic aftermarket copy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shaft size does this seal fit?\u003c\/strong\u003e 0.875 inch is the shaft size the Sierra 18-2062 oil seal is designed to fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this seal be used anywhere OMC 329923 was originally installed?\u003c\/strong\u003e Any application originally fitted with OMC 329923 can use the Sierra 18-2062 as a direct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box with this order?\u003c\/strong\u003e One Sierra 18-2062 oil seal ships per order, ready for direct installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does this seal differ from a generic oil seal?\u003c\/strong\u003e Unlike unbranded seals, the Sierra 18-2062 is manufactured to match the OMC 329923 OEM specification exactly, so the outer diameter, shaft size, and width are correct for the application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the outer diameter of the 18-2062 seal?\u003c\/strong\u003e 1.375 inches is the outer diameter (OD) of the Sierra 18-2062 oil seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091384027,"sku":"SIE-18-2062","price":8.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2062__30613.1722504964.500.750.jpg?v=1785188855"},{"product_id":"sierra-18-2061-upper-oil-seal-for-evinrude-johnson-omc-outboards-replaces-oem-313715-prop-driveshaft","title":"Sierra Oil Seal 18-2061, Replaces OMC 329922, for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2061 is an oil seal engineered for the prop and driveshaft area of Evinrude outboard motors. It seals against water intrusion and oil loss at the point where the driveshaft passes through the lower unit housing, protecting internal gears and bearings from corrosion and lubricant contamination. The seal features a machined exterior finish for a precise, consistent fit in the housing bore, and its compact dimensions (1.375 inch outer diameter, 0.822 inch shaft size, 0.195 inch width) match the tight tolerances required for a proper seal in this application. Because oil seals are a wear item exposed to constant water contact and shaft rotation, they are a common maintenance replacement whenever a lower unit is serviced, rebuilt, or opened up for gear or bearing work. The Sierra 18-2061 is built as a direct equivalent to the original OMC 329922 seal, allowing it to be installed in the same location without modification. It is sold as an individual replacement seal, sized specifically for Evinrude outboard prop and driveshaft seal applications.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2061\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Evinrude Outboard Prop and Driveshaft Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.822 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.195 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 329922\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGLM Cross Reference Number:\u003c\/strong\u003e 86240\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310125\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Evinrude outboard prop and driveshaft seal applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 329922\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2061 oil seal fit?\u003c\/strong\u003e The Sierra 18-2061 is designed for Evinrude outboard prop and driveshaft seal applications, sealing the point where the driveshaft passes through the lower unit housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2061 seal equivalent to an OMC part?\u003c\/strong\u003e Yes, the Sierra 18-2061 is a direct equivalent to OMC part number 329922 and installs in the same location without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2061 oil seal?\u003c\/strong\u003e It has an outer diameter of 1.375 inches, a shaft size of 0.822 inches, and a width of 0.195 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2061 oil seal weigh?\u003c\/strong\u003e The Sierra 18-2061 weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-2061 have?\u003c\/strong\u003e This oil seal has a machined exterior finish, which helps it seat precisely in the housing bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this oil seal be replaced?\u003c\/strong\u003e Oil seals like the 18-2061 are a wear item and are commonly replaced whenever the lower unit is serviced, rebuilt, or opened for gear or bearing work, or if water intrusion or oil loss is noticed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2061 sold as a single seal or a kit?\u003c\/strong\u003e The Sierra 18-2061 is sold as an individual replacement oil seal, not part of a multi-piece kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2061 have any other cross-reference numbers besides OMC 329922?\u003c\/strong\u003e Yes, the 18-2061 also carries GLM cross-reference number 86240 in addition to matching OMC 329922.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2061 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-2061 oil seal is 030999310125.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2061 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-2061 is manufactured and sold under the Sierra brand as a replacement seal for Evinrude outboard applications, built as a direct equivalent to the OMC 329922 seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091416795,"sku":"SIE-18-2061","price":7.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2061__97314.1722507300.500.750.jpg?v=1785188559"},{"product_id":"sierra-18-2059-lower-oil-seal-replaces-omc-317624-for-evinrude-johnson-outboard-prop-shaft-driveshaft","title":"Sierra Oil Seal 18-2059, Replaces OMC 321466, for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2059 Oil Seal is a precision-machined replacement seal built for Evinrude outboard prop and driveshaft applications. It is a direct cross-reference for OMC part number 321466, giving boat owners a reliable way to replace a worn or leaking factory seal without hunting down an original OMC part. The seal's small, compact profile (0.39 x 0.39 x 0.39 inches) is typical of the precision-fit seals used around driveshaft and propeller shaft housings, where even a minor leak can lead to water intrusion or lubricant loss. At just 0.05 pounds, it is a lightweight component designed to be installed as part of routine lower-unit or driveshaft seal maintenance.\u003c\/p\u003e\u003cp\u003eSierra manufactures this seal with a machined exterior finish to help ensure a consistent, snug fit against the housing bore it seats in, which is important for maintaining a proper seal under the pressure and vibration of outboard operation. The part is cataloged under Sierra's Evinrude Outboard Prop \u0026amp; Driveshaft Seals line, making it a straightforward choice for owners servicing this specific area of an Evinrude outboard. Because it is sold as an individual seal rather than a full kit, it allows for targeted replacement of just the failed component.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2059\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310101\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop \u0026amp; Driveshaft Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 321466\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Evinrude outboard prop and driveshaft seal applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e321466\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2059 oil seal replace?\u003c\/strong\u003e The Sierra 18-2059 is a direct cross-reference for OMC part number 321466, so it can be used wherever that original seal is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this seal made by Sierra or a third party?\u003c\/strong\u003e Yes, the 18-2059 is manufactured under the Sierra brand as a replacement oil seal, not a generic unbranded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2059 oil seal?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches, a small, compact seal sized for driveshaft and propeller shaft housings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2059 oil seal weigh?\u003c\/strong\u003e This seal weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of outboard is the 18-2059 seal used on?\u003c\/strong\u003e The Sierra 18-2059 is cataloged for Evinrude outboard prop and driveshaft seal applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish of this seal?\u003c\/strong\u003e The 18-2059 has a machined exterior finish, which helps it seat snugly in its housing bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2059 oil seal manufactured?\u003c\/strong\u003e The country of origin listed for the 18-2059 oil seal is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2059 seal fit if my parts diagram calls out OMC 321466?\u003c\/strong\u003e Yes, since Sierra 18-2059 is cross-referenced to OMC 321466, it is intended as the equivalent replacement for that OEM number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2059 come as a single seal or a kit?\u003c\/strong\u003e The 18-2059 is sold as an individual oil seal, allowing targeted replacement of just this component rather than a full seal kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2059 oil seal?\u003c\/strong\u003e The UPC for this Sierra oil seal is 030999310101.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091482331,"sku":"SIE-18-2059","price":11.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2059_lg__80119.1558122366.500.750.jpg?v=1785188205"},{"product_id":"sierra-18-2075-oil-seal-for-evinrude-johnson-outboards-replaces-omc-332942-2-062-od-x-1-562-shaft","title":"Sierra Oil Seal 18-2075, Replaces OMC 332942, for Evinrude Outboard Prop Shaft\/Driveshaft","description":"\u003cp\u003eThe Sierra 18-2075 is an oil seal engineered for Evinrude outboard prop and driveshaft applications. It rides on a 1.562 inch shaft and fits a 2.062 inch outer diameter bore, with a compact 0.300 inch width that fits the original seal cavity without modification. The seal carries a machined exterior finish for a precise, consistent fit against the housing bore, helping it hold its seal against water intrusion and lubricant loss at the prop shaft and driveshaft interface.\u003c\/p\u003e\u003cp\u003eThis seal is a direct cross-reference for OMC 332942, making it a straightforward replacement when the original equipment seal has hardened, cracked, or begun to leak. Keeping the prop shaft or driveshaft seal in good condition protects the gear case from water intrusion, which is one of the most common causes of gear lube contamination and internal corrosion in outboard lower units. Because a worn seal is a small, low-cost part responsible for protecting an expensive gear case, replacing it proactively during a lower unit service is a common maintenance practice.\u003c\/p\u003e\u003cp\u003eThe Sierra 18-2075 is sold individually and is sized for use where the 1.562 inch shaft and 2.062 inch bore dimensions match the original seal being replaced.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2075\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Evinrude Outboard Prop and Driveshaft Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 2.062 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 1.562 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.300 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.28 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999562432\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 332942\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 332942\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2075 oil seal fit?\u003c\/strong\u003e The Sierra 18-2075 is an oil seal designed for Evinrude outboard prop and driveshaft applications, sized to a 1.562 inch shaft and a 2.062 inch outer diameter bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2075 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-2075 is a Sierra-manufactured replacement seal, sold as a direct cross-reference for OMC 332942 rather than an original Evinrude\/OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-2075 replace?\u003c\/strong\u003e The Sierra 18-2075 replaces OMC 332942, so it can be ordered using either part number when servicing the prop shaft or driveshaft seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the shaft size and outer diameter of this seal?\u003c\/strong\u003e The 18-2075 has a shaft size of 1.562 inches and an outer diameter of 2.062 inches, with a width of 0.300 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2075 oil seal weigh?\u003c\/strong\u003e The Sierra 18-2075 oil seal weighs 0.28 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-2075 seal have?\u003c\/strong\u003e This seal has a machined exterior finish, giving it a precise fit against the housing bore for a consistent seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the prop shaft or driveshaft seal on my outboard?\u003c\/strong\u003e A worn or hardened seal like the 18-2075 can allow water to enter the gear case, which leads to gear lube contamination and internal corrosion, so replacing it at the first sign of leakage protects the lower unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in the package?\u003c\/strong\u003e The Sierra 18-2075 is sold as a single individual oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2075 come with installation instructions or tools?\u003c\/strong\u003e The Sierra 18-2075 is supplied as the seal component only, without installation tools or instructions in the package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-2075 be used on other outboard brands besides Evinrude?\u003c\/strong\u003e The Sierra 18-2075 is cataloged for Evinrude outboard prop and driveshaft seal applications and cross-references to OMC 332942; confirm your shaft size and bore diameter match 1.562 inches and 2.062 inches before ordering for another application.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091515099,"sku":"SIE-18-2075","price":9.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sierra_lg_1062__11886.1558123186.500.750.jpg?v=1785188227"},{"product_id":"sierra-18-2073-oil-seal-replaces-omc-981268-evinrude-johnson-outboard-prop-driveshaft-seal-1-750-in-id","title":"Sierra Oil Seal 18-2073, Replaces OMC 981268, Evinrude Outboard Prop and Driveshaft Seal","description":"\u003cp\u003eThe Sierra 18-2073 is an oil seal engineered for Evinrude outboard prop and driveshaft applications. It is designed as a direct equivalent for OMC part number 981268, restoring a proper seal where the driveshaft or propeller shaft passes through the gearcase housing to keep gear lubricant in and water out. A compromised or worn seal in this location is a common cause of milky gear oil and water intrusion into the lower unit, so replacing this seal is a routine part of gearcase maintenance and rebuild work.\u003c\/p\u003e\u003cp\u003eThis seal measures 0.39 x 0.39 x 0.39 inches and weighs 0.07 pounds, with a machined exterior finish for a precise fit against the housing bore and shaft. Because oil seals are wear items exposed to constant shaft rotation, heat, and lubricant contact, they should be replaced any time a gearcase is opened up for service rather than reused. This part is sold individually; some gearcase applications call for multiple units of this seal, so confirm the quantity needed for your specific rebuild before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2073\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop \u0026amp; Driveshaft Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310248\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 981268\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUsed in Evinrude outboard prop and driveshaft assemblies that call for OEM seal 981268.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e981268\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2073 oil seal replace?\u003c\/strong\u003e It replaces OEM part number 981268, so it can be ordered as a direct equivalent for that seal in Evinrude outboard prop and driveshaft applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The Sierra 18-2073 measures 0.39 x 0.39 x 0.39 inches, sized to seat precisely in the gearcase bore against the shaft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2073 oil seal weigh?\u003c\/strong\u003e It weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this seal used for?\u003c\/strong\u003e This seal is used in Evinrude outboard prop and driveshaft assemblies to keep gear lubricant contained and water out of the lower unit where the shaft passes through the housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2073 a genuine Evinrude\/OMC part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-2073 is an aftermarket seal manufactured by Sierra as an equivalent to OMC part 981268, not an OMC-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-2073 seal have?\u003c\/strong\u003e It has a machined exterior finish for a precise fit within the gearcase housing bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many of these seals do I need for a gearcase rebuild?\u003c\/strong\u003e The Sierra 18-2073 is sold individually; check your specific gearcase parts breakdown, since some rebuilds call for more than one of this seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I reuse an old oil seal instead of replacing it?\u003c\/strong\u003e No, an oil seal like the 18-2073 is a wear item and should be replaced any time the gearcase is opened, since a worn seal allows water intrusion or lubricant loss.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat signs indicate this oil seal needs replacement?\u003c\/strong\u003e Milky or discolored gear lubricant and water found in the lower unit are common signs that the seal at this location, such as the Sierra 18-2073, has failed and needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the part number to reference when ordering?\u003c\/strong\u003e Reference Sierra part number 18-2073, or its OEM equivalent 981268, when ordering this seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091613403,"sku":"SIE-18-2073","price":16.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2073__56684.1722489412.500.750.jpg?v=1785188182"},{"product_id":"sierra-18-2056-oil-seal-for-mercury-mariner-outboards-replaces-mercury-26-89238-26-66302-1-in-black-rubber","title":"Sierra 18-2056 Oil Seal for Mercury Marine Stern Drive Model 898\/228, Replaces 26-66302 26-96503","description":"\u003cp\u003eThe Sierra 18-2056 is a rubber oil seal engineered as a direct replacement component for Mercury Marine stern drive applications, specifically fitting Stern Drive Model 898\/228 within the serial number range 4782330 to 6225576. This seal is designed to prevent oil leakage and keep contaminants out of the drive unit housing, protecting internal gears and bearings from water intrusion and lubricant loss. Built from black rubber material, the seal is sized with a 1 inch item diameter and is manufactured for compatibility with the original equipment specification it replaces.\u003c\/p\u003e\u003cp\u003eThis is a single-piece oil seal (quantity of 1 required per the applicable service reference) intended for technicians and boat owners performing stern drive maintenance or seal replacement service. It serves as a functional equivalent to Mercury Marine part numbers 26-66302 and 26-96503, allowing for straightforward replacement without altering fit or function. As a compact, precision-molded rubber component, it is intended to be installed following standard stern drive service procedures and torque\/seating practices for oil seals in this housing location.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2056\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Diameter:\u003c\/strong\u003e 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 11.176 centimeters length x 10.16 centimeters width x 0.762 centimeters height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310071\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStern Drive Model Fitment:\u003c\/strong\u003e 898\/228\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Number Range:\u003c\/strong\u003e 4782330 to 6225576\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine Stern Drive Model 898\/228, serial numbers 4782330 to 6225576\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 26-66302\u003c\/li\u003e\n\u003cli\u003eMercury Marine 26-96503\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat stern drive does the Sierra 18-2056 oil seal fit?\u003c\/strong\u003e The Sierra 18-2056 fits Mercury Marine Stern Drive Model 898\/228 within the serial number range 4782330 to 6225576.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2056 replace?\u003c\/strong\u003e This oil seal replaces Mercury Marine 26-66302 and 26-96503, so either OEM number can be cross-referenced to this Sierra 18-2056 seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many of these seals are needed per stern drive?\u003c\/strong\u003e One Sierra 18-2056 oil seal is required per the applicable Stern Drive Model 898\/228 service application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2056 oil seal made from?\u003c\/strong\u003e It is made from black rubber, which provides the flexibility and sealing properties needed for stern drive oil seal applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra 18-2056 oil seal?\u003c\/strong\u003e The Sierra 18-2056 has an item diameter of 1 inch and measures 11.176 centimeters in length, 10.16 centimeters in width, and 0.762 centimeters in height as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2056 oil seal weigh?\u003c\/strong\u003e The Sierra 18-2056 oil seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2056 a genuine Mercury Marine part or an aftermarket seal?\u003c\/strong\u003e The 18-2056 is a Sierra-brand seal manufactured as a replacement for Mercury Marine 26-66302 and 26-96503, not an OEM Mercury Marine part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is this oil seal used within the stern drive?\u003c\/strong\u003e The 18-2056 is used within the Mercury Marine Stern Drive Model 898\/228 housing to prevent oil leakage and keep out water and debris.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-2056?\u003c\/strong\u003e The order includes one Sierra 18-2056 rubber oil seal, packaged individually.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2056 manufactured?\u003c\/strong\u003e The Sierra 18-2056 oil seal is manufactured in Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2056 be used on a stern drive outside the listed serial number range?\u003c\/strong\u003e The Sierra 18-2056 is specified for Stern Drive Model 898\/228 with serial numbers 4782330 to 6225576; use outside that range is not confirmed by the fitment data.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091678939,"sku":"SIE-18-2056","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/118-2056__97933.1753840676.500.750.jpg?v=1785188676"},{"product_id":"sierra-18-2533-transom-seal-for-omc-sterndrive-cobra-stern-drive-replaces-omc-911797","title":"Sierra 18-2533 Transom Seal for OMC Sterndrive and Cobra Stern Drive, Replaces 911797","description":"\u003cp\u003eThe Sierra 18-2533 Transom Seal is a round transom seal engineered for OMC Sterndrive and Cobra Stern Drive applications. It seals the transom opening where the drive unit passes through the boat's hull, forming a critical barrier against water intrusion into the bilge. Each package contains one transom seal, sized and molded to seat directly in place of the original equipment seal it replaces.\u003c\/p\u003e\u003cp\u003eSierra builds this seal to meet or exceed the specification of the original OMC part, giving boat owners a direct-fit replacement without modification. It is commonly needed when the factory transom seal has hardened, cracked, or begun to leak with age, a routine maintenance item for stern drive boats. The 18-2533 is backed by a limited warranty and is cross-referenced to OMC part number 911797, making it easy to identify as the correct replacement for that original component.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2533\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Transom Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e OMC Sterndrive, Cobra Stern Drive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1 transom seal per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999312280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999312280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for OMC Sterndrive and Cobra Stern Drive units.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 911797\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2533 transom seal fit?\u003c\/strong\u003e The Sierra 18-2533 is designed for OMC Sterndrive and Cobra Stern Drive applications, sealing the transom opening where the drive unit passes through the hull.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2533 the same as OMC part 911797?\u003c\/strong\u003e Yes, the 18-2533 transom seal is the direct cross-reference replacement for OMC 911797.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package of the 18-2533?\u003c\/strong\u003e One transom seal is included per package of the Sierra 18-2533.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2533 transom seal weigh?\u003c\/strong\u003e The Sierra 18-2533 transom seal weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-2533 transom seal?\u003c\/strong\u003e It is a round transom seal, matching the shape of the OMC 911797 seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2533 a genuine OEM part or an aftermarket equivalent?\u003c\/strong\u003e The 18-2533 is a Sierra-manufactured replacement part built to meet or exceed the original equipment part it replaces, not an OEM-branded component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2533 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-2533 transom seal is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2533 different from Sierra's 18-2767 and 18-2768 transom seals?\u003c\/strong\u003e The 18-2533 is a distinct transom seal for OMC Sterndrive and Cobra Stern Drive units, while the 16-hole 18-2767 replaces OMC 313080 for 120 HP and up applications from 1967-77, and the 22-hole 18-2768 replaces OMC 909527 for all applications from 1978-86 -- these are separate parts for different fitments, so match the part number to your drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a transom seal like the 18-2533 do?\u003c\/strong\u003e A transom seal such as the Sierra 18-2533 seals the opening in the boat's transom where the stern drive unit passes through, preventing water from entering the bilge.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2533 transom seal?\u003c\/strong\u003e The Sierra 18-2533 transom seal carries UPC 030999312280.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106916059,"sku":"SIE-18-2533","price":12.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2533_lg__14609.1558122332.500.750.jpg?v=1785188494"},{"product_id":"sierra-18-2516-9-bravo-outdrive-seal-pack-of-5-replaces-mercruiser-16755-16755a1-16755q1-fits-bravo-drives","title":"Sierra Outdrive Seal 18-2516-9, Pack of 5, Fits Bravo Drives","description":"\u003cp\u003eThe Sierra Outdrive Seal, part number 18-2516-9, is sold as a pack of 5 seals for use on Bravo drives. Outdrive seals like this one are installed at the drive unit to help keep water out and lubricant in around rotating and mating surfaces, protecting internal drive components from water intrusion and preventing lubricant loss. Because this part is sold in a pack of 5, it gives boat owners and marine technicians enough seals on hand to complete a full outdrive seal replacement or to keep spares in stock for future service work.\u003c\/p\u003e\u003cp\u003eEach individual seal measures 0.39 x 0.39 x 0.39 inches, a compact size consistent with the small sealing points found within a stern drive unit. The part is manufactured by Sierra, a long-established supplier of marine replacement parts, and is cataloged specifically for Bravo drive applications. Ordering by the Sierra part number 18-2516-9 ensures the correct seal is selected for this fitment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2516-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5 seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Bravo drives\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercruiser Drive O-Rings and Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162641\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eBravo drives\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2516-9 outdrive seal used for?\u003c\/strong\u003e It is an outdrive seal installed on Bravo drives to help seal the drive unit against water intrusion and lubricant loss at rotating and mating surfaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a pack of 18-2516-9?\u003c\/strong\u003e The 18-2516-9 outdrive seal is sold in a pack of 5, giving you enough seals on hand for a full replacement or to keep spares in stock.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2516-9 seal?\u003c\/strong\u003e Each individual seal measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2516-9 outdrive seal weigh?\u003c\/strong\u003e The Sierra outdrive seal 18-2516-9 weighs 0.03 pounds per unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2516-9 seal fit Bravo drives?\u003c\/strong\u003e Yes, the Sierra 18-2516-9 outdrive seal is designated for Bravo drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2516-9 a genuine Sierra part number?\u003c\/strong\u003e Yes, 18-2516-9 is the Sierra manufacturer part number for this outdrive seal pack of 5.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy the 18-2516-9 seal individually instead of a 5-pack?\u003c\/strong\u003e The 18-2516-9 outdrive seal is packaged and sold as a set of 5 seals, not individually.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the Sierra 18-2516-9?\u003c\/strong\u003e The Sierra 18-2516-9 is categorized as a drive O-ring and seal, specifically an outdrive seal for Bravo drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2516-9?\u003c\/strong\u003e An order of Sierra part 18-2516-9 includes 5 outdrive seals sized 0.39 x 0.39 x 0.39 inches each.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2516-9 seal backed by a warranty?\u003c\/strong\u003e The 18-2516-9 outdrive seal is backed by Sierra's manufacturer warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106948827,"sku":"SIE-18-2516-9","price":34.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2516-9__61355.1737836175.500.750.jpg?v=1785188182"},{"product_id":"sierra-18-2724-transom-seal-replaces-mercruiser-3713-fits-mercruiser-alpha-gen-ii-and-all-bravo-sterndrives","title":"Sierra Transom Seal 18-2724, Replaces 24-17997A1, for Alpha I Gen II and Bravo I, II, III Drives","description":"\u003cp\u003eThe Sierra 18-2724 Transom Seal is a white, round transom seal engineered to fit Alpha I Generation II and Bravo I, II, and III drives. It seals the gap where the drive shaft housing passes through the transom assembly, helping to keep water out of the bilge and boat interior at this critical hull penetration point. Installing a properly fitted transom seal is a routine part of stern drive maintenance, and using the correct part number for your specific drive generation is essential to maintain a watertight seal.\u003c\/p\u003e\u003cp\u003eThis seal is manufactured by Sierra, a long-established supplier of marine engine and drive parts, and is built to meet or exceed the performance of the original equipment part it replaces. It directly replaces OEM part number 24-17997A1, making it a straightforward like-for-like swap for boat owners and marine technicians servicing Alpha I Generation II and Bravo I, II, and III drive units.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2724\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Transom Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAlpha I Generation II Drives\u003c\/li\u003e\n\u003cli\u003eBravo I, II, and III Drives\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e24-17997A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat drives does the Sierra 18-2724 transom seal fit?\u003c\/strong\u003e The Sierra 18-2724 transom seal is designed for Alpha I Generation II drives and Bravo I, II, and III drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-2724 replace?\u003c\/strong\u003e This transom seal replaces OEM part number 24-17997A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2724 transom seal?\u003c\/strong\u003e It is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the transom seal?\u003c\/strong\u003e The Sierra 18-2724 is a round transom seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2724 transom seal weigh?\u003c\/strong\u003e It weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2724 a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e Sierra 18-2724 is a Sierra-branded transom seal manufactured to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-2724 work on a standard Bravo drive as well as Bravo II and III?\u003c\/strong\u003e Yes, the Sierra 18-2724 transom seal is listed for Bravo I, II, and III drives, in addition to Alpha I Generation II drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the purpose of a transom seal on a stern drive boat?\u003c\/strong\u003e A transom seal such as the Sierra 18-2724 seals the opening where the drive shaft housing passes through the boat transom, helping prevent water intrusion into the bilge.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2724 fit Alpha I Generation I drives?\u003c\/strong\u003e No, the Sierra 18-2724 is specified for Alpha I Generation II drives, not Generation I.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-2724 as a direct replacement without modification?\u003c\/strong\u003e Yes, the Sierra 18-2724 transom seal is designed as a direct replacement for OEM part 24-17997A1 on Alpha I Generation II and Bravo I, II, and III drives.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988109570267,"sku":"SIE-18-2724","price":17.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2724_lg__01488.1558122777.500.750.jpg?v=1785188486"},{"product_id":"transom-seal-for-omc-cobra-sterndrive-1978-1986-replaces-omc-909527-22-hole-sierra-18-2768","title":"Sierra 18-2768 Transom Seal, Replaces OMC 909527, Fits 1978-86 OMC Sterndrive All","description":"\u003cp\u003eThe Sierra 18-2768 Transom Seal is the gasket\/seal assembly that mounts at the transom of an OMC sterndrive, sealing the connection point between the boat's transom assembly and the outdrive unit to keep water out of the bilge and engine compartment while allowing the drive shafts and cables to pass through. This is a 22-hole seal built to the OEM bolt pattern for a direct, gasket-tight fit at reassembly. Sierra manufactures the part to meet or exceed the specifications of the original equipment it replaces, making it a straightforward like-for-like replacement when servicing a worn, cracked, or leaking transom seal during a sterndrive rebuild or bellows\/seal replacement job.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2768\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e OMC Bellows \u0026amp; Transom Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt Hole Count:\u003c\/strong\u003e 22 hole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.42 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999562944\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 909527\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC Sterndrive, 1978-86, All\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e909527\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat boats does the Sierra 18-2768 transom seal fit?\u003c\/strong\u003e The Sierra 18-2768 fits OMC Sterndrive applications for 1978-86, all models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-2768 replace?\u003c\/strong\u003e It replaces OEM part number 909527.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bolt holes does this transom seal have?\u003c\/strong\u003e The 18-2768 is a 22-hole transom seal, matching the OEM bolt pattern for 1978-86 OMC Sterndrive units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2768 transom seal weigh?\u003c\/strong\u003e It weighs 2.42 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2768 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured replacement part engineered to meet or exceed the specifications of the original OMC 909527 transom seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2768 transom seal?\u003c\/strong\u003e The Sierra 18-2768 measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the transom seal on my OMC sterndrive?\u003c\/strong\u003e The transom seal should be replaced when it is cracked, worn, or leaking, which is typically checked during a sterndrive bellows and seal service to prevent water intrusion at the transom.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish of the 18-2768?\u003c\/strong\u003e The Sierra 18-2768 transom seal has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2768 come with a warranty?\u003c\/strong\u003e Yes, the 18-2768 is covered under Sierra's standard customer satisfaction warranty like all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2768 fit an earlier OMC sterndrive from the late 1960s or early 1970s?\u003c\/strong\u003e No. The 18-2768 is designed for 1978-86 OMC Sterndrive applications; earlier OMC sterndrives use a different transom seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988112584923,"sku":"SIE-18-2768","price":157.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2768_lg__97041.1558122287.500.750.jpg?v=1785188284"},{"product_id":"sierra-18-2996-9-marine-outdrive-washer-replaces-oem-909748-stern-drive-pack-of-5","title":"Sierra 18-2996-9 Outdrive Seal for OMC Stern Drive Applications, Pack of 5","description":"\u003cp\u003eThe Sierra 18-2996-9 Outdrive Seal is designed for use in OMC stern drive applications, sold in a pack of five seals per package. This aluminum seal is built to meet or exceed the specifications of the original equipment part it replaces, giving boat owners a reliable option when servicing outdrive components. Selling seals in a multi-pack lets technicians and owners keep spares on hand for routine maintenance or replace a full set in one service session rather than ordering single units repeatedly.\u003c\/p\u003e\u003cp\u003eEach seal is finished in gray and constructed from aluminum for durability in the marine environment where outdrive seals operate. The 18-2996-9 is cross-referenced to several widely used industry part numbers, making it straightforward to identify as the correct replacement when working from an existing part number rather than a brand name. The compact package (6.46 x 5.83 x 0.67 inches) ships as five individual seals, each measuring approximately 6.5 x 4 x 1 inches, at a total weight of 0.03 pounds.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2996-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Outdrive Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5 seals per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e OMC stern drive applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Gray\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 6.5 x 4 x 1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 6.46 x 5.83 x 0.67 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282164461\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 86300, Mallory 9-76508, OMC Stern Drive 3852560, 911823, Volvo Penta 3852560\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for use in OMC stern drive applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 86300\u003c\/li\u003e\n\u003cli\u003eMallory 9-76508\u003c\/li\u003e\n\u003cli\u003eOMC Stern Drive 3852560\u003c\/li\u003e\n\u003cli\u003e911823\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3852560\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat applications is the Sierra 18-2996-9 outdrive seal designed for?\u003c\/strong\u003e The Sierra 18-2996-9 outdrive seal is designed for use in OMC stern drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in one package of the Sierra 18-2996-9?\u003c\/strong\u003e Each package of the Sierra 18-2996-9 contains five outdrive seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2996-9 seal a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-2996-9 is an aftermarket outdrive seal built to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2996-9 cross-reference to any other part numbers?\u003c\/strong\u003e Yes, the Sierra 18-2996-9 outdrive seal is interchangeable with GLM 86300, Mallory 9-76508, OMC Stern Drive 3852560, 911823, and Volvo Penta 3852560.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-2996-9 outdrive seal made from?\u003c\/strong\u003e The Sierra 18-2996-9 outdrive seal is made from aluminum and finished in gray.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of each Sierra 18-2996-9 seal?\u003c\/strong\u003e Each individual seal measures approximately 6.5 x 4 x 1 inches, and the full pack of five ships in a package measuring 6.46 x 5.83 x 0.67 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2996-9 seal weigh?\u003c\/strong\u003e The Sierra 18-2996-9 outdrive seal pack weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I order individual Sierra 18-2996-9 seals instead of a pack?\u003c\/strong\u003e The Sierra 18-2996-9 is sold as a pack of five seals per package, not as a single unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need multiple outdrive seals like the Sierra 18-2996-9 at once?\u003c\/strong\u003e Outdrive service typically calls for replacing seals as a set, so the Sierra 18-2996-9 is packaged five to a box to cover a full service job or provide spares for future maintenance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2996-9 the same as GLM 86300?\u003c\/strong\u003e The Sierra 18-2996-9 outdrive seal is interchangeable with GLM 86300, so it can be used as a direct replacement for that part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default 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