{"title":"U-Joints \u0026 Bellows","description":null,"products":[{"product_id":"sierra-18-1711-u-joint-cross-bearing-replaces-mercury-862132t-fits-mercruiser-alpha-one-bravo-gen-ii-mc-i-r-mr","title":"Sierra U-Joint Cross Bearing 18-1711, Replaces Mercury Marine 862132T","description":"\u003cp\u003eThe Sierra 18-1711 U-Joint Cross Bearing is a replacement cross bearing designed for marine drive u-joints, built from alloy steel for durability under the load and rotational stress a u-joint assembly sees in service. It is lubricated with grease and supplied as a single unit for straightforward swap-in replacement when an existing cross bearing has worn out or is being serviced as part of a u-joint rebuild. As a direct equivalent to the original Mercury Marine part, it is intended to restore u-joint function to factory specification without modification to the surrounding driveline components. The alloy steel construction is matched to OEM material specification, and the bearing carries a limited warranty. This part ships as one bearing per package and is intended for buyers replacing a worn or damaged cross bearing rather than a complete u-joint kit.\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 18-1711\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Cross Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.85 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 Count\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282167196\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUniversal u-joint cross bearing; no specific engine, horsepower, or model-year fitment is listed.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 862132T\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-1711 U-Joint Cross Bearing used for?\u003c\/strong\u003e It is a cross bearing that fits inside a marine drive u-joint assembly, allowing the joint to pivot smoothly while transmitting rotational power; the Sierra 18-1711 is used to replace a worn or damaged cross bearing during u-joint service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1711 cross bearing replace an OEM Mercury Marine part?\u003c\/strong\u003e Yes, the Sierra 18-1711 is a direct equivalent to Mercury Marine part number 862132T.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-1711 cross bearing made from?\u003c\/strong\u003e It is made from alloy steel, matching the material specification of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1711 cross bearing weigh?\u003c\/strong\u003e The bearing weighs 1.85 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bearings come in one package of the 18-1711?\u003c\/strong\u003e Each package of the Sierra 18-1711 U-Joint Cross Bearing contains a single unit (1 count).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat kind of lubricant should be used with this cross bearing?\u003c\/strong\u003e Grease is the compatible lubricant for the Sierra 18-1711 U-Joint Cross Bearing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1711 a genuine Mercury Marine part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-branded aftermarket replacement built to OEM specification as an equivalent to Mercury Marine 862132T, not a Mercury Marine branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1711 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-1711 U-Joint Cross Bearing is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1711 cross bearing specific to certain engines or model years?\u003c\/strong\u003e No specific engine, horsepower, or model-year fitment is listed for the Sierra 18-1711; it is a cross bearing sized for standard marine u-joint assemblies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1711 U-Joint Cross Bearing?\u003c\/strong\u003e The UPC is 808282167196.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088795355,"sku":"SIE-18-1711","price":162.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1711_lg__25005.1558122752.500.750.jpg?v=1785188585"},{"product_id":"sierra-18-1728-bellows-flange-ring-replaces-oem-816607-fits-mercruiser-alpha-one-gen-ii-1991-and-up","title":"Sierra 18-1728 Bellow Flange Ring for MerCruiser Alpha One Gen II (1991 \u0026 Up)","description":"\u003cp\u003eThe Sierra 18-1728 is a rubber bellow flange ring built for MerCruiser Alpha One (Gen II) sterndrives (1991 and up). This white rubber ring seals and reinforces the flange area of the exhaust\/drive bellow assembly, helping maintain a watertight connection between the transom and the sterndrive unit. As a wear component in the sterndrive's bellows system, it is a part boat owners typically replace during routine bellows maintenance or when performing a full bellows kit replacement, since rubber components in this location are exposed to constant flexing, saltwater or freshwater immersion, and engine vibration over time.\u003c\/p\u003e\u003cp\u003eSierra manufactures this flange ring to meet or exceed the specifications of the original equipment part it is designed to work with, and Sierra supplies parts to OEM engine manufacturers and boat builders as part of its regular production. The compact, lightweight ring is easy to handle during installation and is sized specifically for Alpha One (Gen II) applications, so boat owners working on this sterndrive series can source a correctly fitted replacement flange ring rather than a generic substitute.\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 18-1728\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\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282295073\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit within stated application\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser Alpha One (Gen II), 1991 \u0026amp; Up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat boats and drives does the Sierra 18-1728 fit?\u003c\/strong\u003e The Sierra 18-1728 bellow flange ring is designed for MerCruiser Alpha One (Gen II) sterndrives, 1991 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-1728 flange ring made of?\u003c\/strong\u003e It is made of white rubber, a material chosen for its flexibility and ability to hold a seal in the bellows flange area.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1728 weigh?\u003c\/strong\u003e This flange ring weighs 0.01 pounds, reflecting its small, lightweight construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1728 an OEM or aftermarket part?\u003c\/strong\u003e The 18-1728 is a Sierra-manufactured part engineered to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1728 bellow flange ring?\u003c\/strong\u003e The UPC for this part is 808282295073.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this flange ring?\u003c\/strong\u003e Replacement is typically needed during sterndrive bellows maintenance, since rubber components at the flange are subject to ongoing flexing and water exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1728 fit older MerCruiser Alpha One models before Gen II?\u003c\/strong\u003e No fitment is stated for MerCruiser Alpha One models prior to the Gen II, 1991-and-up application; only that range is confirmed for the 18-1728.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1728 bellow flange ring?\u003c\/strong\u003e The ring is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a universal-fit part?\u003c\/strong\u003e The Sierra 18-1728 is listed as a universal fit within its stated MerCruiser Alpha One (Gen II), 1991 \u0026amp; Up application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra stand behind the 18-1728 with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-1728 bellow flange ring is covered by a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088828123,"sku":"SIE-18-1728","price":21.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1728__25318.1729019993.500.750.jpg?v=1785188543"},{"product_id":"sierra-18-1710-bellow-flange-ring-for-mercruiser-bravo-replaces-oem-862209-86814","title":"Sierra 18-1710 Bellow Flange Ring, Replaces 862209 86814, Fits All Bravo Drives","description":"\u003cp\u003eThe Sierra 18-1710 Bellow Flange Ring is a machined flange ring designed for the exhaust bellows on all Bravo sterndrive units. It seats and secures the bellows against the drive housing, maintaining a proper seal at the connection point between the bellows and the drive. As a direct replacement part, it is built to meet or exceed the specifications of the original equipment it replaces, making it a reliable choice when servicing or rebuilding the bellows assembly on a Bravo drive.\u003c\/p\u003e\u003cp\u003eThis flange ring is a small but essential component in the bellows system, and using the correct ring helps ensure the bellows seats correctly and holds its seal, which is critical for keeping water out of the boat and exhaust gases properly routed. It is sold as an individual replacement ring for technicians and boat owners performing bellows maintenance or full bellows replacement on Bravo-equipped MerCruiser drives.\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 18-1710\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Bellow Flange Ring\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\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282295097\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 862209, 86814\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAll Bravo sterndrive models\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e862209\u003c\/li\u003e\n\u003cli\u003e86814\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1710 Bellow Flange Ring fit?\u003c\/strong\u003e The 18-1710 flange ring fits all Bravo sterndrive models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-1710 replace?\u003c\/strong\u003e This flange ring replaces OEM part numbers 862209 and 86814.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1710 a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra part, manufactured to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the weight of the 18-1710 Bellow Flange Ring?\u003c\/strong\u003e The Sierra 18-1710 Bellow Flange Ring weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Bellow Flange Ring?\u003c\/strong\u003e The 18-1710 measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the finish on the 18-1710 flange ring?\u003c\/strong\u003e The flange ring has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace the flange ring when replacing the bellows on a Bravo drive?\u003c\/strong\u003e Yes, the 18-1710 flange ring seats and seals the bellows against the drive housing, so it should be inspected and replaced along with the bellows to maintain a proper seal on Bravo units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-1710 fit an Alpha One drive?\u003c\/strong\u003e No, the 18-1710 is designated for all Bravo models; a separate flange ring, part number 18-1728, is used for Alpha One (GenII) applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-1710?\u003c\/strong\u003e The order includes one Sierra 18-1710 Bellow Flange Ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1710 come in a display package?\u003c\/strong\u003e The 18-1710 is the standard non-display packaged number; a corresponding display-packaged version exists as a separate item.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1710 Bellow Flange Ring?\u003c\/strong\u003e The UPC for the Sierra 18-1710 Bellow Flange Ring is 808282295097.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088860891,"sku":"SIE-18-1710","price":6.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1710__86676.1729021691.500.750.jpg?v=1785189148"},{"product_id":"sierra-18-1705-hinge-pin-with-grease-port-for-mercruiser-alpha-alpha-gen-ii-gimbal-housing-replaces-77123-s-n-0m815638-lower","title":"Sierra Hinge Pin 18-1705 - Replaces 77123, 77123A1, 65547 - Gimbal Housing for Alpha Gen II and Bravo","description":"\u003cp\u003eThe Sierra Hinge Pin 18-1705 is a replacement hinge pin for the gimbal housing on Alpha Gen II and Bravo sterndrives. It is built from metal for durability in the marine environment and is designed to meet or exceed the performance of the original equipment part it replaces. This hinge pin secures the gimbal housing to the transom assembly, and correct fitment matters for proper steering and trim function, so installers should confirm the serial number range and drive model before ordering.\u003c\/p\u003e\u003cp\u003eThis part is designed to fit Alpha Gen II units with serial number 0M85639 and up, as well as all Bravo models equipped with a trim sender. Sierra manufactures this hinge pin as a direct cross-reference replacement for the OEM numbers 77123, 77123A1, and 65547, making it a straightforward swap when the original hinge pin is worn, corroded, or damaged. As with other Sierra replacement parts, it is engineered to hold up under the demands of high-horsepower engines and the harsh marine operating environment.\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 18-1705\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Hinge Pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Gimbal Housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\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 808282186609\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAlpha Gen II, S\/N 0M85639 \u0026amp; UP\u003c\/li\u003e\n\u003cli\u003eBravo, All Models with trim sender\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e77123\u003c\/li\u003e\n\u003cli\u003e77123A1\u003c\/li\u003e\n\u003cli\u003e65547\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-1705 hinge pin used for?\u003c\/strong\u003e It is a hinge pin for the gimbal housing on Alpha Gen II and Bravo sterndrives, securing the gimbal housing so the drive can steer and trim correctly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill hinge pin 18-1705 fit an Alpha Gen II drive?\u003c\/strong\u003e Yes, but only on Alpha Gen II units with serial number 0M85639 and up; earlier serial numbers are not covered by this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-1705 fit Bravo drives?\u003c\/strong\u003e It fits all Bravo models equipped with a trim sender.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-1705 hinge pin replace?\u003c\/strong\u003e It cross-references to OEM numbers 77123, 77123A1, and 65547.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1705 hinge pin genuine OEM or aftermarket?\u003c\/strong\u003e The 18-1705 is a Sierra aftermarket replacement part engineered to meet or exceed the performance of the original 77123\/77123A1\/65547 hinge pin it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-1705 hinge pin made from?\u003c\/strong\u003e This hinge pin is made from metal for durability in marine use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1705 hinge pin weigh?\u003c\/strong\u003e It weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many hinge pins come in one package?\u003c\/strong\u003e The Sierra 18-1705 is sold as a single hinge pin.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1705 hinge pin?\u003c\/strong\u003e The UPC for this hinge pin is 808282186609.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-1705 hinge pin be used on gimbal bearing applications?\u003c\/strong\u003e No, the 18-1705 is specifically a gimbal housing hinge pin, not a gimbal bearing; confirm your drive's serial number and model against the Alpha Gen II and Bravo fitment before ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088926427,"sku":"SIE-18-1705","price":23.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1705_lg__03496.1729094776.500.750.jpg?v=1785188526"},{"product_id":"sierra-18-2097-permalube-u-joint-cross-bearing-for-mercruiser-stern-drive-replaces-805536a2-serial-f680000-ok999999","title":"Sierra 18-2097 U-Joint Permalube, Replaces 805536A2, for MerCruiser Bravo One\/Two\/Three Sterndrives","description":"\u003cp\u003eThe Sierra 18-2097 is a Permalube u-joint built as a direct replacement for the u-joint used in MerCruiser Bravo One, Two, and Three sterndrives (all ratios), including the Bravo One X, Two X, Three X (all ratios), Bravo One XR\/XZ (all ratios), and Bravo One XR Sportmaster (all ratios), as well as Integrated Transom applications. The u-joint transmits rotational drive from the driveshaft to the propeller shaft through the drive's u-joint bellows\/gimbal assembly, and it is a wear item that should be inspected and replaced as part of routine sterndrive maintenance or whenever play, corrosion, or roughness is found in the joint. Permalube construction means the joint is factory-packed with grease at the needle bearings, so it does not require an external grease fitting to be serviced during installation. The part is machined for a precise fit against the yoke and cross bearing surfaces it mates to. Sierra manufactures the 18-2097 as a cross-reference to the original Mercury Marine u-joint, so it installs the same as the factory part on the drives listed above 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 18-2097\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication:\u003c\/strong\u003e Permalube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Bravo One, Two, \u0026amp; Three (All Ratios), Bravo One X\/Two X, Three X (All Ratios), Bravo One XR\/XZ (All Ratios), Bravo One XR Sportmaster (All Ratios) \u0026amp; Integrated Transom\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 8055361, 805536A1, 805536A2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.23 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 1.31 x 5.5 x 3.44 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 808282239947\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBravo One, Two, \u0026amp; Three (All Ratios)\u003c\/li\u003e\n\u003cli\u003eBravo One X\/Two X, Three X (All Ratios)\u003c\/li\u003e\n\u003cli\u003eBravo One XR\/XZ (All Ratios)\u003c\/li\u003e\n\u003cli\u003eBravo One XR Sportmaster (All Ratios)\u003c\/li\u003e\n\u003cli\u003eIntegrated Transom\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e8055361\u003c\/li\u003e\n\u003cli\u003e805536A1\u003c\/li\u003e\n\u003cli\u003e805536A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-2097 replace?\u003c\/strong\u003e It cross-references to Mercury Marine numbers 8055361, 805536A1, and 805536A2, so any of those OEM numbers point to the same u-joint as the Sierra 18-2097.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich sterndrives does this u-joint fit?\u003c\/strong\u003e The 18-2097 is built for MerCruiser Bravo One, Two, and Three drives (all ratios), including Bravo One X\/Two X, Three X (all ratios), Bravo One XR\/XZ (all ratios), Bravo One XR Sportmaster (all ratios), and Integrated Transom applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this u-joint fit Alpha series drives?\u003c\/strong\u003e The Sierra 18-2097 is listed specifically for the Bravo One, Two, and Three drive family and Integrated Transom applications, not for Alpha series drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does Permalube mean on this u-joint?\u003c\/strong\u003e Permalube on the 18-2097 means the needle bearings are factory-packed with grease, so the joint is ready to install without needing an external grease fitting serviced at assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and weight of the 18-2097 u-joint?\u003c\/strong\u003e The Sierra 18-2097 measures 1.31 x 5.5 x 3.44 inches and weighs 1.23 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2097 a genuine Sierra part or a generic aftermarket copy?\u003c\/strong\u003e It is manufactured by Sierra under part number 18-2097 and sold under the Sierra brand, machined as a direct cross-reference to the Mercury Marine u-joint it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2097?\u003c\/strong\u003e You receive one Sierra 18-2097 Permalube u-joint; it is sold as a single u-joint, not a kit with seals or bellows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2097 different from the Mercury Marine 805536A2 it replaces?\u003c\/strong\u003e Functionally the 18-2097 is a direct replacement for Mercury Marine 805536A2, 805536A1, and 8055361, machined by Sierra with Permalube grease packed into the bearings for the same fit and application on Bravo drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-2097 myself or does it need a machine shop?\u003c\/strong\u003e The Sierra 18-2097 is a machined replacement u-joint sized for direct installation in the Bravo drive's u-joint assembly; no machining is required since it is made to the same fit as the OEM part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-2097 u-joint have?\u003c\/strong\u003e The Sierra 18-2097 has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2097 work on Bravo One XR Sportmaster drives?\u003c\/strong\u003e Yes, the Sierra 18-2097 is listed for Bravo One XR Sportmaster (all ratios) in addition to Bravo One, Two, Three, and the other Bravo variants.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091580635,"sku":"SIE-18-2097","price":82.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2097_lg__68410.1558123807.500.750.jpg?v=1785188167"},{"product_id":"sierra-18-21001-gimbal-bearing-replaces-mercury-30-879194a02-fits-mercruiser-alpha-bravo-i-ii-iii-gen-ii-sterndrives-non-greasable","title":"Sierra 18-21001 Gimbal Bearing for Blackhawk 1994-1995, Serial F186717 and Up","description":"\u003cp\u003eThe Sierra 18-21001 is a ball-type gimbal bearing built to support the coupling between the engine and the stern drive unit on applicable inboard\/outboard boats. It is constructed of metal for durability in the marine environment and is lubricated with grease to keep the bearing running smoothly under load. The bearing carries the Sierra brand assurance that its replacement parts meet or exceed the performance of the original equipment part they replace, and it ships as a single unit ready for installation in place of a worn or failed gimbal bearing.\u003c\/p\u003e\u003cp\u003eThis bearing is compact, measuring 0.39 x 0.39 x 0.39 inches, and is designed to fit Blackhawk applications from 1994-1995 with serial number F186717 and up. Boat owners servicing their stern drive coupling in this fitment range can use the 18-21001 as a direct fit for that application. As with any drivetrain bearing, replacing a worn gimbal bearing helps prevent excess play, vibration, and premature wear on the connected driveshaft components.\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 18-21001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Gimbal Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Ball Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Thickness:\u003c\/strong\u003e 25 Millimeters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282294168\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00808282294168\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\u003cul\u003e\u003cli\u003eBlackhawk, 1994-1995, serial number F186717 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-21001 gimbal bearing used for?\u003c\/strong\u003e The 18-21001 is a ball-type gimbal bearing that supports the coupling between the engine and stern drive unit, and it is used to replace a worn or failed gimbal bearing in that application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat boats does the 18-21001 gimbal bearing fit?\u003c\/strong\u003e This bearing fits Blackhawk applications from 1994-1995 with serial number F186717 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-21001 an OEM or aftermarket bearing?\u003c\/strong\u003e The 18-21001 is a Sierra-brand replacement bearing designed to meet or exceed the performance of the original equipment gimbal bearing it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-21001 gimbal bearing made from?\u003c\/strong\u003e It is made of metal, which is standard for gimbal bearings that must hold up to marine driveline loads and moisture exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-21001 gimbal bearing weigh?\u003c\/strong\u003e The Sierra 18-21001 gimbal bearing weighs 1.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-21001 gimbal bearing?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches, with an item thickness of 25 millimeters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-21001 gimbal bearing need to be lubricated?\u003c\/strong\u003e Yes, the 18-21001 is compatible with grease lubrication to keep the bearing operating smoothly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of bearing is the Sierra 18-21001?\u003c\/strong\u003e The 18-21001 is a ball bearing, identified by Sierra under bearing number 18-21001.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-21001 come with a warranty?\u003c\/strong\u003e Yes, the 18-21001 gimbal bearing is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-21001 is the correct gimbal bearing for my boat?\u003c\/strong\u003e Confirm your application is a Blackhawk from 1994-1995 with serial number F186717 or higher before ordering the 18-21001, since gimbal bearings vary by drive unit and serial number range.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091711707,"sku":"SIE-18-21001","price":75.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sie-18-21001_lg__98260.1558139580.500.750.jpg?v=1785189093"},{"product_id":"sierra-18-21005-gimbal-bearing-replaces-mercruiser-30-862540a3-fits-all-bravo-alpha-one-gen-ii-1998-up","title":"Sierra Gimbal Bearing 18-21005, White - Replaces Mercruiser 30-862540A3, Mallory 9-72412","description":"\u003cp\u003eThe Sierra 18-21005 Gimbal Bearing is a replacement gimbal bearing engineered to meet or exceed original equipment quality. It supports the engine coupler shaft where the outdrive connects to the transom assembly, allowing the drive to pivot for steering while carrying the rotating load from the engine. The bearing is finished in white and constructed of alloy steel for durability in the marine drive environment, and it is designed to run with grease as the compatible lubricant.\u003c\/p\u003e\u003cp\u003eThis gimbal bearing is a direct interchange for several widely used OEM and aftermarket part numbers, making it a straightforward swap when replacing a worn or failed gimbal bearing on compatible sterndrive setups. Each Sierra part is built to match or exceed the fit, form, and function of the original part it replaces.\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 18-21005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Gimbal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4.25 x 4.25 x 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.26 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282188474\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e Mallory 9-72412, Mercruiser 30-862540A3, 30-879194A01, 30-862540T1, 30-862540A04\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMallory 9-72412\u003c\/li\u003e\n\u003cli\u003eMercruiser 30-862540A3\u003c\/li\u003e\n\u003cli\u003eMercruiser 30-879194A01\u003c\/li\u003e\n\u003cli\u003eMercruiser 30-862540T1\u003c\/li\u003e\n\u003cli\u003eMercruiser 30-862540A04\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-21005 Gimbal Bearing used for?\u003c\/strong\u003e It supports the coupler shaft connecting the engine to the outdrive, allowing the drive to pivot for steering while carrying the rotating load between the engine and sterndrive. The Sierra 18-21005 is built to meet or exceed original equipment quality for this application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-21005 a direct replacement for the OEM gimbal bearing?\u003c\/strong\u003e Yes, the Sierra 18-21005 is interchangeable with Mallory 9-72412 and Mercruiser 30-862540A3, 30-879194A01, 30-862540T1, and 30-862540A04, so it installs as a direct swap for any of those part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-21005 Gimbal Bearing?\u003c\/strong\u003e The bearing measures 4.25 x 4.25 x 2 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-21005 Gimbal Bearing weigh?\u003c\/strong\u003e It weighs 1.26 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-21005 Gimbal Bearing made of?\u003c\/strong\u003e Alloy steel is the construction material, chosen for durability in a marine drive environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-21005 Gimbal Bearing?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat lubricant should be used with the Sierra 18-21005 Gimbal Bearing?\u003c\/strong\u003e Grease is the compatible lubricant for this gimbal bearing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the Sierra 18-21005 replace?\u003c\/strong\u003e This bearing replaces Mallory 9-72412 and Mercruiser 30-862540A3, 30-879194A01, 30-862540T1, and 30-862540A04.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-21005 genuine Sierra or an aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra part, part number 18-21005, manufactured to meet or exceed the quality of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gimbal bearings come in the package?\u003c\/strong\u003e The Sierra 18-21005 is sold as a single gimbal bearing unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-21005 Gimbal Bearing?\u003c\/strong\u003e The UPC for this part is 808282188474.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-21005 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-21005 Gimbal Bearing is covered by a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091744475,"sku":"SIE-18-21005","price":88.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-21005__56763.1558323002.500.750.jpg?v=1785188204"},{"product_id":"gimbal-bearing-18-21006-replaces-mercruiser-30-879194a01-fits-bravo-i-ii-iii-x-xr-xz-and-alpha-gen-ii-non-greasable","title":"Sierra Gimbal Bearing 18-21006, Replaces 30-879194A01, Fits Bravo I\/II\/III\/X\/XR\/XZ (1996-2010) \u0026 Gen II (1998-2010)","description":"\u003cp\u003eThis Sierra gimbal bearing (18-21006) supports the engine coupler where it passes through the gimbal ring, allowing the drive unit to pivot for steering and trim while carrying the load of the engine coupler shaft. It is built with an alloy steel ball bearing design and finished in white. The bearing is a non-greasable design, so there is no grease fitting to service on a routine maintenance schedule. It functions as a direct replacement for OEM part 30-879194A01 and is sized to fit the same coupler bore used across the applicable Bravo and Gen II sterndrive lines.\u003c\/p\u003e\u003cp\u003eSierra 18-21006 fits Bravo I, II, III, X, XR, and XZ sterndrives built 1996-2010, and Gen II sterndrives built 1998-2010. Within the Bravo XZ line, it is confirmed for units with serial number F730000 and up. Because gimbal bearing wear directly affects coupler alignment and can accelerate U-joint and bellows wear if left unaddressed, replacing a worn or pitted bearing with a properly sized unit like this one helps keep the drive shaft running true.\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 18-21006\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Gimbal Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Ball Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication:\u003c\/strong\u003e Non Greasable\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 1.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282294175\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00808282294175\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification Met:\u003c\/strong\u003e ISO 9001\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBravo I, II, III, X, XR, and XZ sterndrives, 1996-2010\u003c\/li\u003e\n\u003cli\u003eBravo XZ sterndrives, serial number F730000 and up\u003c\/li\u003e\n\u003cli\u003eGen II sterndrives, 1998-2010\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e30-879194A01\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does gimbal bearing 18-21006 fit?\u003c\/strong\u003e Sierra 18-21006 fits Bravo I, II, III, X, XR, and XZ sterndrives built 1996-2010, and Gen II sterndrives built 1998-2010. On Bravo XZ units it is confirmed for serial number F730000 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-21006 the same as OEM part 30-879194A01?\u003c\/strong\u003e Yes, Sierra 18-21006 is a direct replacement for OEM part 30-879194A01 and is sized to the same coupler bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gimbal bearing need to be greased?\u003c\/strong\u003e No. The 18-21006 gimbal bearing is a non-greasable design, so there is no grease fitting to service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-21006 gimbal bearing made from?\u003c\/strong\u003e It is machined from alloy steel in a ball-bearing design, finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-21006 gimbal bearing weigh?\u003c\/strong\u003e The 18-21006 gimbal bearing weighs 1.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of gimbal bearing 18-21006?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-21006 fit a Bravo I sterndrive?\u003c\/strong\u003e Yes, Sierra 18-21006 is listed as fitting Bravo I sterndrives built 1996-2010, along with Bravo II, III, X, XR, and XZ of the same years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-21006 fit Gen II sterndrives?\u003c\/strong\u003e Yes, this gimbal bearing fits Gen II sterndrives built 1998-2010.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the 18-21006 gimbal bearing?\u003c\/strong\u003e The package includes one Sierra 18-21006 gimbal bearing, sold as a single unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-21006 gimbal bearing genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-21006 is a genuine Sierra-branded part manufactured to ISO 9001 specification met standards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range is confirmed for Bravo XZ fitment on 18-21006?\u003c\/strong\u003e For Bravo XZ sterndrives, Sierra 18-21006 is confirmed for serial number F730000 and up.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091810011,"sku":"SIE-18-21006","price":91.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-21006__76270.1650893893.500.750.jpg?v=1785188482"},{"product_id":"sierra-18-2100-gimbal-bearing-for-mercruiser-alpha-one-bravo-gen-ii-sterndrives-replaces-mercury-30-60794a4-1974-1997","title":"Sierra Link Belt Gimbal Bearing 18-2100, Replaces 3853807, Fits OMC\/Volvo 3.0L-8.2L (1994-1998)","description":"\u003cp\u003eThe Sierra 18-2100 is a link belt gimbal bearing built to support the drive shaft where it passes through the transom assembly on OMC and Volvo Penta sterndrive setups. Constructed of metal, this is a non-sealed design, which means it can be greased for ongoing lubrication rather than being a sealed, grease-and-forget unit. The bearing measures 4 x 4 x 2 inches overall with a 2 inch outside diameter, and weighs 1.3 pounds.\u003c\/p\u003e\u003cp\u003eThis bearing is a direct replacement for OMC part number 3853807 and is intended for OMC\/Volvo engines in the 3.0L, 4.3L, 5.0L, 5.7L, and 7.4L range (1994-1998), the 5.8L (1994-1996), and the 8.2L (1998). Installers use it during routine transom and gimbal housing service, or when replacing a worn or failing original bearing that is causing drive shaft vibration or play.\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 18-2100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Gimbal Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Link Belt, non-sealed (greasable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4 x 4 x 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310262\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC\/Volvo 3.0L, 4.3L, 5.0L, 5.7L, 7.4L (1994-1998)\u003c\/li\u003e\n\u003cli\u003eOMC\/Volvo 5.8L (1994-1996)\u003c\/li\u003e\n\u003cli\u003eOMC\/Volvo 8.2L (1998)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3853807\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2100 gimbal bearing fit?\u003c\/strong\u003e The Sierra 18-2100 fits OMC\/Volvo engines in the 3.0L, 4.3L, 5.0L, 5.7L, and 7.4L range for 1994-1998, the 5.8L for 1994-1996, and the 8.2L for 1998.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2100 a direct replacement for OMC 3853807?\u003c\/strong\u003e Yes, Sierra 18-2100 is a direct replacement for OMC part number 3853807.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gimbal bearing sealed or can it be greased?\u003c\/strong\u003e The 18-2100 is a non-sealed link belt design, meaning it can be greased for ongoing lubrication rather than being a maintenance-free sealed unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2100 gimbal bearing made of?\u003c\/strong\u003e It is made of metal, matching the construction of the original equipment bearing it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2100?\u003c\/strong\u003e The bearing measures 4 x 4 x 2 inches overall with a 2 inch outside diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2100 gimbal bearing weigh?\u003c\/strong\u003e It weighs 1.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of bearing design is the 18-2100?\u003c\/strong\u003e It is a link belt gimbal bearing, part number 18-2100, designed for the drive shaft transom support on compatible OMC\/Volvo sterndrives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2100 gimbal bearing need to be greased regularly?\u003c\/strong\u003e Yes, since it is a non-sealed design, the 18-2100 should be greased periodically as part of routine sterndrive maintenance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engine sizes does the 18-2100 cover?\u003c\/strong\u003e Coverage spans 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 5.8L, and 8.2L OMC\/Volvo engines, with the specific model years noted in the fitment listing for 18-2100.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this gimbal bearing?\u003c\/strong\u003e The 18-2100 gimbal bearing is typically replaced during transom and gimbal housing service, or when the original bearing is worn and causing drive shaft vibration or play.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2100 an OEM or aftermarket part?\u003c\/strong\u003e The 18-2100 is an aftermarket bearing manufactured to match the fit and function of the original OMC 3853807 bearing it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2100?\u003c\/strong\u003e Ordering 18-2100 gets you one Sierra link belt gimbal bearing, ready for installation in place of OMC part 3853807.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988092006619,"sku":"SIE-18-2100","price":59.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__13531.1772266902.500.750.jpg?v=1785188182"},{"product_id":"sierra-18-2104-heavy-duty-u-joint-cross-bearing-replaces-mercury-75832a2-fits-mercruiser-alpha-one-gen-ii-drive-shaft-housing","title":"Sierra U-Joint Cross Bearing 18-2104, Replaces 75832A2, Fits Alpha I and TR\/TRS Units","description":"\u003cp\u003eThe Sierra 18-2104 is a heavy duty U-joint cross bearing (universal joint) designed for use in the gimbal\/drive shaft coupling of outdrive units. It transmits rotational power through an angled connection while allowing the drive shaft to articulate, a wear point that requires periodic replacement as boats accumulate hours. This U-joint is built to heavy duty specification for durable service under continuous marine loads.\u003c\/p\u003e\u003cp\u003eEach unit includes both a straight grease fitting and a 90 degree grease fitting, giving installers flexibility to fit the zerk fitting in whichever orientation clears surrounding components during service, which simplifies routine lubrication once installed. The cross bearing is intended as a direct fit replacement for the OEM part it supersedes, using the same mounting geometry and bearing cup arrangement as the original equipment.\u003c\/p\u003e\u003cp\u003eThe Sierra 18-2104 fits all #1 and ALPHA I units within serial number range 1684188-B418818, and also fits TR\/TRS and II SSM drive units. Because it is designated for this specific serial number range and unit type, confirm your outdrive's serial number and unit designation 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 18-2104\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint Cross Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuty Rating:\u003c\/strong\u003e Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrease Fittings Included:\u003c\/strong\u003e Straight and 90 degree\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 3.5 x 3.5 x 1.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.22 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 China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310293\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits all #1 and ALPHA I units, S\/N 1684188-B418818\u003c\/li\u003e\n\u003cli\u003eAlso fits TR\/TRS and II SSM units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e75832\u003c\/li\u003e\n\u003cli\u003e75832A2\u003c\/li\u003e\n\u003cli\u003e75832T\u003c\/li\u003e\n\u003cli\u003e758321\u003c\/li\u003e\n\u003cli\u003e75832T1\u003c\/li\u003e\n\u003cli\u003e75832A1\u003c\/li\u003e\n\u003cli\u003e75832A3\u003c\/li\u003e\n\u003cli\u003e58749\u003c\/li\u003e\n\u003cli\u003e41431\u003c\/li\u003e\n\u003cli\u003e36312\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2104 U-joint replace?\u003c\/strong\u003e The Sierra 18-2104 replaces OEM numbers 75832, 75832A2, 75832T, 758321, 75832T1, 75832A1, 75832A3, 58749, 41431, and 36312.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat units does the 18-2104 U-joint fit?\u003c\/strong\u003e It fits all #1 and ALPHA I units within serial number range 1684188-B418818, and also fits TR\/TRS and II SSM units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2104 U-joint weigh?\u003c\/strong\u003e The Sierra 18-2104 U-joint cross bearing weighs 1.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this U-joint?\u003c\/strong\u003e The Sierra 18-2104 measures 3.5 x 3.5 x 1.25 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat grease fittings come with the 18-2104?\u003c\/strong\u003e Both a straight grease fitting and a 90 degree grease fitting are included with the Sierra 18-2104, so the installer can choose the orientation that clears surrounding components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2104 a heavy duty U-joint?\u003c\/strong\u003e Yes, the 18-2104 is built to a heavy duty specification for durable service in the drive shaft coupling of the outdrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if this U-joint fits my outdrive?\u003c\/strong\u003e Check your outdrive's unit type and serial number; the 18-2104 fits #1 and ALPHA I units in the S\/N range 1684188-B418818, and TR\/TRS and II SSM units. Confirm your serial number falls in that range before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2104 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-2104 is manufactured and sold under the Sierra brand as a direct replacement for the listed OEM cross-reference numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2104 manufactured?\u003c\/strong\u003e The Sierra 18-2104 U-joint cross bearing is manufactured in China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2104?\u003c\/strong\u003e Ordering the Sierra 18-2104 includes the U-joint cross bearing along with a straight grease fitting and a 90 degree grease fitting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2104 be used on TR\/TRS units?\u003c\/strong\u003e Yes, in addition to #1 and ALPHA I units, the Sierra 18-2104 also fits TR\/TRS and II SSM units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2104 fit Alpha One drives outside the listed serial number range?\u003c\/strong\u003e The Sierra 18-2104 is designated for ALPHA I units within S\/N range 1684188-B418818; units outside this serial range should be verified against a different part number before ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988092104923,"sku":"SIE-18-2104","price":47.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2104_lg__52980.1558139701.500.750.jpg?v=1785188873"},{"product_id":"sierra-18-2125-yoke-assembly-short-replaces-mercury-46020t-for-mercruiser-alpha-one-gen-ii-i-o-drives","title":"Sierra 18-2125 Drive Shaft Yoke, Replaces Mercury Marine 46020T","description":"\u003cp\u003eThe Sierra 18-2125 is a drive shaft yoke assembly built as a direct equivalent for Mercury Marine part 46020T. The yoke connects the drive shaft to the u-joint coupler in the stern drive gimbal assembly, transmitting engine torque through the drive train. It is finished in black and constructed for reliable, repeated use in a marine environment where corrosion resistance and dimensional accuracy matter.\u003c\/p\u003e\u003cp\u003eThis yoke is sold as a single component (one yoke per package) and is intended as a replacement part when the original yoke shows wear, cracking, or play at the u-joint connection. Because it is manufactured to match the original Mercury Marine 46020T equivalent, it installs using the same fasteners and mating parts as the original part it replaces, 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 18-2125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Yoke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\/Finish:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 7.4 x 3.4 x 3.3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999311436\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications that originally used Mercury Marine part number 46020T.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 46020T\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2125 yoke replace?\u003c\/strong\u003e It is a direct equivalent for Mercury Marine part number 46020T, so it installs anywhere that original part was used.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2125 an OEM Mercury Marine part or aftermarket?\u003c\/strong\u003e The 18-2125 is manufactured by Sierra as an aftermarket equivalent to the Mercury Marine 46020T yoke, not an original Mercury Marine part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2125 yoke?\u003c\/strong\u003e It has a black finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2125 weigh?\u003c\/strong\u003e This yoke weighs 2.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2125 yoke?\u003c\/strong\u003e The item measures 7.4 x 3.4 x 3.3 inches (length x width x height).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many yokes come in the package?\u003c\/strong\u003e The 18-2125 is sold as a single yoke, one item per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat signals that a drive shaft yoke needs replacement?\u003c\/strong\u003e Cracking, wear, or excess play at the u-joint connection point on the existing yoke indicates it is time to replace it with a part like the Sierra 18-2125.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes installing the 18-2125 require modification to the drive shaft housing?\u003c\/strong\u003e No. Since the Sierra 18-2125 is built to match the Mercury Marine 46020T it replaces, it uses the same mounting points and mating parts without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2125 yoke?\u003c\/strong\u003e The UPC for the Sierra 18-2125 drive shaft yoke is 030999311436.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does the yoke fit in the drive train?\u003c\/strong\u003e The 18-2125 yoke connects the drive shaft to the u-joint coupler in the gimbal assembly, transmitting torque from the engine through the drive shaft.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988092170459,"sku":"SIE-18-2125","price":81.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2125_lg__39226.1558121959.500.750.jpg?v=1785187970"},{"product_id":"center-socket-39383t-for-mercruiser-alpha-one-gen-ii-bravo-omc-cobra-u-joint-drive-shaft-sierra-18-2128","title":"Sierra 18-2128 Center Socket for MerCruiser Alpha One, Bravo, MC-I, MC II, TS, IA\/IB\/IC and EZ, Gen II, and OMC Cobra Drives","description":"\u003cp\u003eThe Sierra 18-2128 Center Socket is a stern drive coupling component that connects the drive shaft assembly to the U-joint, transferring power from the engine to the outdrive. It is a fit-specific part, meaning it is engineered to match particular drive units rather than serving as a universal fit across all stern drives, so confirming the correct application before ordering is important.\u003c\/p\u003e\u003cp\u003eThis Center Socket is designed for MerCruiser IA\/IB\/IC and EZ, MC-I, R, MR, Alpha One, and Gen II drives up to serial number 0L949778, as well as MerCruiser Bravo drives up to serial number 0M111207, MC II, and TS drives. It also fits all OMC Cobra sterndrives. Sierra states that each part it manufactures meets or exceeds the specifications of the original equipment part it replaces, making this Center Socket a direct functional replacement for the applicable OEM component.\u003c\/p\u003e\u003cp\u003eThe Center Socket ships as a single component and is sold individually. It weighs 2.04 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 18-2128\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Center Socket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999311467\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Fit-specific; confirm drive application before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser IA\/IB\/IC and EZ, MC-I, R, MR, Alpha One, and Gen II (serial number 0L949778 and below)\u003c\/li\u003e\n\u003cli\u003eMerCruiser Bravo (serial number 0M111207 and below), MC II, and TS\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra sterndrives\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e393\u003c\/li\u003e\n\u003cli\u003e735\u003c\/li\u003e\n\u003cli\u003e393831\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2128 Center Socket fit?\u003c\/strong\u003e This Center Socket fits MerCruiser IA\/IB\/IC and EZ, MC-I, R, MR, Alpha One, and Gen II drives with serial number 0L949778 and below, MerCruiser Bravo drives with serial number 0M111207 and below, MC II, TS drives, and all OMC Cobra sterndrives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2128 Center Socket a universal fit for all stern drives?\u003c\/strong\u003e No. Sierra designates part 18-2128 as a fit-specific component, so it is built for the listed MerCruiser and OMC Cobra drive applications rather than a one-size-fits-all fit, and confirming your drive model and serial number before ordering is recommended.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-2128 Center Socket replace?\u003c\/strong\u003e The Sierra 18-2128 Center Socket cross-references to OEM numbers 393, 735, and 393831.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2128 Center Socket weigh?\u003c\/strong\u003e The Sierra 18-2128 Center Socket weighs 2.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many Center Sockets come in the package?\u003c\/strong\u003e Part 18-2128 is sold as a single Center Socket, with a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra Center Socket perform the same as the original equipment part?\u003c\/strong\u003e Sierra states that the 18-2128 Center Socket meets or exceeds the specifications of the original equipment part it replaces, so it functions as a direct replacement in its listed applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2128 Center Socket fit a MerCruiser Bravo drive with a serial number above 0M111207?\u003c\/strong\u003e The 18-2128 Center Socket is listed for MerCruiser Bravo drives with serial number 0M111207 and below; drives above that serial number are not covered by this fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2128 fit OMC Cobra sterndrives?\u003c\/strong\u003e Yes, the Sierra 18-2128 Center Socket fits all OMC Cobra sterndrives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a Center Socket used for on a stern drive?\u003c\/strong\u003e A Center Socket, such as Sierra part 18-2128, is a coupling component within the drive shaft assembly that connects to the U-joint to transmit engine power to the stern drive unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the Sierra 18-2128 Center Socket something I can do myself?\u003c\/strong\u003e Because the 18-2128 Center Socket is part of the drive shaft coupling assembly and fit-specific to the drive model, Sierra recommends consulting an authorized dealer to confirm the correct fit and installation for your specific drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2128 fit MerCruiser Alpha One drives?\u003c\/strong\u003e Yes, the Sierra 18-2128 Center Socket is listed for MerCruiser Alpha One drives, along with IA\/IB\/IC and EZ, MC-I, R, MR, and Gen II drives at or below serial number 0L949778.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988092334299,"sku":"SIE-18-2128","price":91.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2128_lg__05380.1649077556.500.750.jpg?v=1785188518"},{"product_id":"sierra-18-2146-u-joint-shaft-coupler-yoke-replaces-mercury-59830a1-mercruiser-alpha-one-gen-ii-r-mr-bravo-blackhawk-omc-cobra","title":"Sierra 18-2146 Yoke, Replaces Mercruiser 59830A7, Fits Alpha One, Bravo \u0026 Cobra Drives","description":"\u003cp\u003eThe Sierra 18-2146 Yoke is a drive coupler yoke used to connect the engine coupler to the U-joint shaft on outdrive and sterndrive setups. It is built as a direct-fit replacement for the original equipment yoke and is designed to restore proper alignment and torque transfer between the engine and drive unit. This yoke fits All #1, R, MR, Alpha I, and Alpha I Gen II drives, as well as Bravo and Blackhawk drives, and it also fits Cobra sterndrives from 1986 and up. It is constructed of metal and finished in white, with compact dimensions of 0.39 x 0.39 x 0.39 inches, making it a small but critical connecting component in the drive train. The yoke is sold as a single piece and is intended as a like-for-like swap for the original part it replaces, meeting or exceeding the performance of the OEM component. Because this yoke crosses over multiple engine and drive brands, it is commonly used as a direct replacement for OEM and aftermarket yokes sold under GLM, Evinrude\/Johnson, Mallory, Mercruiser, OMC, and Volvo Penta part numbers. Confirm your drive model against the fitment list below before ordering to ensure correct compatibility.\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 18-2146\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Yoke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.43 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999752635\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAll #1, R, MR, Alpha I, Alpha I Gen II, Bravo \u0026amp; Blackhawk drives\u003c\/li\u003e\n\u003cli\u003eCobra drives, 1986 and up\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 28315\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 912212\u003c\/li\u003e\n\u003cli\u003eMallory 9-72401\u003c\/li\u003e\n\u003cli\u003eMercruiser 59830A7\u003c\/li\u003e\n\u003cli\u003eMercruiser 59830A1\u003c\/li\u003e\n\u003cli\u003eOMC 912212\u003c\/li\u003e\n\u003cli\u003eOMC 3850815\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3850815\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat drives does the Sierra 18-2146 Yoke fit?\u003c\/strong\u003e This yoke fits All #1, R, MR, Alpha I, and Alpha I Gen II drives, as well as Bravo and Blackhawk drives, and it also fits Cobra drives from 1986 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2146 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-2146 is a Sierra-manufactured replacement part designed to meet or exceed the performance of the original equipment yoke it replaces, rather than a part sourced from the original engine or drive manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-2146 Yoke cross-reference to?\u003c\/strong\u003e It is interchangeable with GLM 28315, Evinrude\/Johnson 912212, Mallory 9-72401, Mercruiser 59830A7 and 59830A1, OMC 912212 and 3850815, and Volvo Penta 3850815.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2146 Yoke made of?\u003c\/strong\u003e The Sierra 18-2146 Yoke is made of metal, finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2146 Yoke weigh?\u003c\/strong\u003e The Sierra 18-2146 Yoke weighs 4.43 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2146 Yoke?\u003c\/strong\u003e The yoke measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2146 Yoke come as a single piece?\u003c\/strong\u003e Yes, the Sierra 18-2146 Yoke is sold individually as one piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-2146 fit a Cobra drive built before 1986?\u003c\/strong\u003e The 18-2146 Yoke is listed as a fit for Cobra drives from 1986 and up; fitment for earlier Cobra drives is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-2146 Yoke be used on both Alpha One and Bravo drives?\u003c\/strong\u003e Yes, this same yoke, part number 18-2146, fits Alpha I, Alpha I Gen II, and Bravo drives, along with All #1, R, MR, and Blackhawk drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I identify the correct yoke for my Mercruiser drive?\u003c\/strong\u003e If your Mercruiser drive originally used part number 59830A7 or 59830A1, the Sierra 18-2146 Yoke is the correct cross-reference replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988092858587,"sku":"SIE-18-2146","price":149.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2146_lg__68086.1558122774.500.750.jpg?v=1785188445"},{"product_id":"sierra-18-21751-engine-coupler-for-volvo-penta-omc-2-5l-8-2l-replaces-3853962","title":"Sierra Engine Coupler 18-21751, Replaces 3853962-3, Fits 2.5L, 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L Engines","description":"\u003cp\u003eThe Sierra 18-21751 Engine Coupler connects the engine flywheel to the drive unit on stern drive powered boats, transferring rotational power from the engine to the outdrive while allowing for the flex needed to accommodate engine and drive alignment. It is built from metal with a machined finish for durability under continuous torque loading, and is finished in white. This coupler is a direct replacement for OEM number 3853962-3, making it a straightforward swap when the original coupler wears out, cracks, or fails to properly transmit power between the engine and drive. It fits a range of stern drive engine displacements including 2.5L (1986), 3.0L (1986-90), 4.3L, 5.0L, 5.7L (1986), 7.4L (1990-98), and 8.2L (1992-93, 1998), with the 4.3L application limited to KW and KWB suffix engines only. Replacing a worn engine coupler is a common maintenance task when a boat develops vibration, clunking on shift, or difficulty engaging gear, since a deteriorated coupler can no longer properly transfer engine power to the outdrive. Each unit ships as a single piece.\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 18-21751\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3\/8 Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 6.45 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\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\u003eNumber of Pieces:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2.5L (1986)\u003c\/li\u003e\n\u003cli\u003e3.0L (1986-90)\u003c\/li\u003e\n\u003cli\u003e4.3L (KW and KWB suffix only)\u003c\/li\u003e\n\u003cli\u003e5.0L\u003c\/li\u003e\n\u003cli\u003e5.7L (1986)\u003c\/li\u003e\n\u003cli\u003e7.4L (1990-98)\u003c\/li\u003e\n\u003cli\u003e8.2L (1992-93, 1998)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3853962-3\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-21751 engine coupler do?\u003c\/strong\u003e The Sierra 18-21751 engine coupler connects the engine flywheel to the stern drive unit, transmitting engine power to the outdrive while flexing slightly to accommodate alignment between the two.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-21751 a direct replacement for OEM part 3853962-3?\u003c\/strong\u003e Yes, Sierra 18-21751 replaces OEM number 3853962-3 and installs as a direct equivalent for that application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-21751 coupler fit?\u003c\/strong\u003e Coverage includes 2.5L (1986), 3.0L (1986-90), 4.3L (KW and KWB suffix engines only), 5.0L, 5.7L (1986), 7.4L (1990-98), and 8.2L (1992-93, 1998) stern drive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 4.3L application fit all 4.3L engines?\u003c\/strong\u003e No, the 4.3L fitment for the 18-21751 coupler is limited specifically to engines with the KW or KWB suffix, not all 4.3L blocks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-21751 engine coupler made from?\u003c\/strong\u003e It is made from metal with a machined finish, providing the rigidity needed to handle continuous torque transfer between engine and drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-21751 engine coupler weigh?\u003c\/strong\u003e The Sierra 18-21751 engine coupler weighs 6.45 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many couplers come in a package?\u003c\/strong\u003e The Sierra 18-21751 ships as a single piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-21751 coupler?\u003c\/strong\u003e It has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the signs that an engine coupler needs to be replaced?\u003c\/strong\u003e Vibration, a clunking noise when shifting into gear, or reduced power transfer to the drive are common symptoms of a worn coupler, and the 18-21751 addresses these on applicable engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the 18-21751 engine coupler manufactured?\u003c\/strong\u003e The country of origin for the Sierra 18-21751 engine coupler is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-21751 an OEM part or aftermarket?\u003c\/strong\u003e It is a Sierra aftermarket part manufactured to replace OEM number 3853962-3 for the listed engine applications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105048283,"sku":"SIE-18-21751","price":257.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-21751__34662.1722497925.500.750.jpg?v=1785189019"},{"product_id":"sierra-18-2174-u-joint-cross-bearing-replaces-mercury-75832a2-mercruiser-sterndrive-universal-joint","title":"Sierra 18-2174 Heavy Duty U-Joint, Replaces Mercury Marine 75832A3, Fits Alpha One SN B418819 \u0026 Above, Alpha One SS, Bravo","description":"\u003cp\u003eThe Sierra 18-2174 is a heavy duty U-joint built as a direct replacement for the U-joint used on Mercruiser Alpha One drive units (S\/N B418819 and above), Alpha One SS, and Bravo drives. It is constructed from alloy steel to handle the torsional loads transmitted through the drive shaft between the engine and outdrive, and it includes both a straight grease fitting and a 90 degree grease fitting so it can be serviced in tight installation clearances where a straight fitting cannot be accessed.\u003c\/p\u003e\u003cp\u003eThis U-joint is designed as a like-for-like replacement for the original equipment part, matching the fit and function of the OEM component it replaces. It ships as a single U-joint unit finished in brown\/black alloy steel, ready to install in place of a worn or failing joint during routine outdrive maintenance or driveline 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 18-2174\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Brown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 3.5 x 3.5 x 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrease Fittings Included:\u003c\/strong\u003e Straight and 90 degree\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999311764\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAlpha I Units, S\/N B418819 and above\u003c\/li\u003e\n\u003cli\u003eAlpha I SS\u003c\/li\u003e\n\u003cli\u003eBravo\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e36312\u003c\/li\u003e\n\u003cli\u003e41431\u003c\/li\u003e\n\u003cli\u003e58749\u003c\/li\u003e\n\u003cli\u003e75832\u003c\/li\u003e\n\u003cli\u003e75832T\u003c\/li\u003e\n\u003cli\u003e75832A1\u003c\/li\u003e\n\u003cli\u003e75832A2\u003c\/li\u003e\n\u003cli\u003e75832A3\u003c\/li\u003e\n\u003cli\u003e758321\u003c\/li\u003e\n\u003cli\u003e75832T1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2174 U-joint fit?\u003c\/strong\u003e This U-joint fits Alpha I drive units with serial number B418819 and above, as well as Alpha I SS and Bravo drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2174 a direct replacement for the original Mercury Marine U-joint?\u003c\/strong\u003e Yes, the Sierra 18-2174 is built as a direct replacement for OEM U-joints including Mercury Marine part numbers 75832, 75832T, 75832A1, 75832A2, 75832A3, 758321, and 75832T1, along with 36312, 41431, and 58749.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2174 cross-reference to?\u003c\/strong\u003e The 18-2174 replaces OEM numbers 36312, 41431, 58749, 75832, 75832T, 75832A1, 75832A2, 75832A3, 758321, and 75832T1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the U-joint weigh?\u003c\/strong\u003e The Sierra 18-2174 U-joint weighs 1.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2174 U-joint made of?\u003c\/strong\u003e It is made of alloy steel, providing the strength needed to handle drive shaft torsional loads between the engine and outdrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2174 come with grease fittings?\u003c\/strong\u003e Yes, the 18-2174 U-joint includes both a straight grease fitting and a 90 degree grease fitting, allowing servicing in installations with limited clearance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2174 U-joint?\u003c\/strong\u003e The U-joint measures 3.5 x 3.5 x 1.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this U-joint work on an older Alpha I unit below serial number B418819?\u003c\/strong\u003e The 18-2174 is specified to fit Alpha I units at serial number B418819 and above, along with Alpha I SS and Bravo; it is not specified for units below that serial number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2174?\u003c\/strong\u003e Each order includes one Sierra 18-2174 heavy duty U-joint with both straight and 90 degree grease fittings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color\/finish is the 18-2174 U-joint?\u003c\/strong\u003e The 18-2174 U-joint has a brown alloy steel finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2174 fit Bravo drives?\u003c\/strong\u003e Yes, in addition to Alpha I (S\/N B418819 \u0026amp; above) and Alpha I SS, the Sierra 18-2174 also fits Bravo drives.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105277659,"sku":"SIE-18-2174","price":54.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2174_lg__64656.1558121620.500.750.jpg?v=1785188089"},{"product_id":"sierra-18-21752-1-marine-engine-coupler-replaces-volvo-penta-omc-3858437-984290-986120-fits-4-3l-5-0l-5-7l-1986-1998","title":"Sierra 18-21752-1 Engine Coupler, White, Replaces 3858437, Fits 4.3L 5.0L 5.7L (1986-1998)","description":"\u003cp\u003eThe Sierra 18-21752-1 is a white marine engine coupler that connects the engine flywheel to the drive unit, transmitting engine power to the outdrive on inboard\/outdrive setups. It is built to meet or exceed the specification of the original equipment part it replaces, and Sierra manufactures it to the same fit, form, and function standard used by OEM engine manufacturers and boat builders. This coupler is a direct cross-reference replacement for four OEM part numbers, so it can be ordered under any of those numbers and installed as a like-for-like swap without modification.\u003c\/p\u003e\u003cp\u003eThe coupler is engineered for GM-based marine engines commonly found in stern drive applications, with confirmed fitment across 4.3L, 5.0L, and 5.7L engine platforms spanning the 1986 through 1998 model years, with specific coverage varying by engine size. Its metal, alloy steel construction is designed to withstand the vibration, torque, and harsh marine operating environment these drivetrain components see in regular service. Because it is a direct OEM cross-reference part rather than a universal fit, boat owners and marine technicians can use it to restore original power transmission between the engine and drive unit during a coupler replacement or drivetrain rebuild.\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 18-21752-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Engine Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal (alloy steel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 6.45 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 16.764 x 15.748 x 16.256 centimeters (L x H x W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282226855\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference Numbers:\u003c\/strong\u003e 3858437, 984290, 986120, 3853917\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e4.3L engines (1986-1998)\u003c\/li\u003e\n\u003cli\u003e5.0L engines (1986-1988, 1998)\u003c\/li\u003e\n\u003cli\u003e5.7L engines (1986-1992, 1994, 1996-1998)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3858437\u003c\/li\u003e\n\u003cli\u003e984290\u003c\/li\u003e\n\u003cli\u003e986120\u003c\/li\u003e\n\u003cli\u003e3853917\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-21752-1 engine coupler fit?\u003c\/strong\u003e The Sierra 18-21752-1 fits 4.3L engines (1986-1998), 5.0L engines (1986-1988 and 1998), and 5.7L engines (1986-1992, 1994, and 1996-1998).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the 18-21752-1 replace?\u003c\/strong\u003e It is a direct cross-reference for OEM numbers 3858437, 984290, 986120, and 3853917, so any of those part numbers can be used to identify the correct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this engine coupler weigh?\u003c\/strong\u003e The Sierra 18-21752-1 engine coupler weighs 6.45 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-21752-1 coupler?\u003c\/strong\u003e This coupler is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the coupler made from?\u003c\/strong\u003e It is made of metal, specifically alloy steel construction, built to hold up under marine drivetrain loads and vibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-21752-1 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-21752-1 is a genuine Sierra marine part manufactured to meet or exceed the specification of the original equipment coupler it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this coupler fit both 5.0L and 5.7L engines the same way?\u003c\/strong\u003e Yes, one 18-21752-1 coupler covers 4.3L (1986-1998), 5.0L (1986-1988, 1998), and 5.7L (1986-1992, 1994, 1996-1998) engines, since fitment is by engine platform rather than a separate part per engine size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-21752-1?\u003c\/strong\u003e Ordering Sierra 18-21752-1 includes one marine engine coupler.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-21752-1 differ from the Sierra 18-21753 coupler?\u003c\/strong\u003e Yes, 18-21753 is a separate Sierra coupler part number with its own OEM cross-reference and its own fitment, so buyers should confirm which part number matches their engine before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the package size of the Sierra 18-21752-1?\u003c\/strong\u003e The Sierra 18-21752-1 ships in packaging measuring 16.764 x 15.748 x 16.256 centimeters (L x H x W).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a warranty on the Sierra 18-21752-1 engine coupler?\u003c\/strong\u003e The 18-21752-1 is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I cross-reference the 18-21752-1 using an old OMC or Volvo part number?\u003c\/strong\u003e Yes, if your old coupler is stamped 3858437, 984290, 986120, or 3853917, the Sierra 18-21752-1 is the correct direct replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105408731,"sku":"SIE-18-21752-1","price":277.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-21752-1__48722.1722487780.500.750.jpg?v=1785188113"},{"product_id":"sierra-18-2171-engine-coupler-for-gm-replaces-mercruiser-76850a2-triangular-3-bolt-coupler","title":"Sierra 18-2171 Engine Coupler, Replaces 76850A2, for GM Engines with Triangular 3-Bolt Coupler except MR\/Alpha\/Bravo","description":"\u003cp\u003eThe Sierra 18-2171 Engine Coupler is a direct replacement engine coupler built for GM engines fitted with a triangular, 3-bolt coupler design, excluding MR\/Alpha\/Bravo drive configurations. It connects the engine flywheel to the transmission or outdrive, transferring rotational torque while accommodating minor misalignment between the engine and drive unit. Correct coupler fitment is critical: installing the wrong coupler pattern can prevent proper engagement with the drive and lead to premature wear or failure.\u003c\/p\u003e\u003cp\u003eThis coupler is manufactured from metal with a machined black finish, built to meet or exceed the quality of the original equipment part it replaces. It is a single-piece unit that cross-references directly to six OEM Mercury\/Mercruiser part numbers, making it straightforward to identify as the correct replacement when servicing engines that use the triangular 3-bolt coupler pattern. Sierra engineers its couplers to hold up under the demands of high-horsepower marine engines operating in harsh, corrosive marine environments.\u003c\/p\u003e\u003cp\u003eUse this coupler when servicing or replacing a worn, cracked, or damaged coupler on an eligible GM engine, or when rebuilding the engine-to-drive connection during an outdrive or transmission service.\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 18-2171\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 5.2 x 5.1 x 4.9 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.63 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999311757\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAll GM engines except MR\/Alpha\/Bravo with a triangular, 3-bolt coupler\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e32492A2\u003c\/li\u003e\n\u003cli\u003e32492A3\u003c\/li\u003e\n\u003cli\u003e32492A5\u003c\/li\u003e\n\u003cli\u003e38965A1\u003c\/li\u003e\n\u003cli\u003e38965A2\u003c\/li\u003e\n\u003cli\u003e76850A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2171 Engine Coupler fit?\u003c\/strong\u003e It fits all GM engines except MR\/Alpha\/Bravo configurations that use a triangular, 3-bolt coupler pattern. Check your existing coupler's bolt pattern before ordering to confirm compatibility.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2171 replace?\u003c\/strong\u003e The Sierra 18-2171 replaces OEM numbers 32492A2, 32492A3, 32492A5, 38965A1, 38965A2, and 76850A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this coupler work with an Alpha or Bravo outdrive?\u003c\/strong\u003e No, the 18-2171 is specifically excluded for MR, Alpha, and Bravo drive configurations; it is intended for GM engines using the triangular 3-bolt coupler pattern instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2171 coupler?\u003c\/strong\u003e The coupler measures 5.2 x 5.1 x 4.9 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2171 weigh?\u003c\/strong\u003e It weighs 3.63 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the engine coupler made from?\u003c\/strong\u003e The 18-2171 is made from metal with a machined black finish for durability in marine service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2171 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket coupler manufactured by Sierra to meet or exceed the specifications of the original equipment coupler it replaces, including 76850A2 and the other listed cross-references.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the package?\u003c\/strong\u003e The 18-2171 ships as a single one-piece coupler unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 3-bolt coupler pattern different from other coupler types?\u003c\/strong\u003e The 18-2171 uses a triangular 3-bolt bolt pattern, which is a different mounting configuration than couplers used on MR\/Alpha\/Bravo drives, so the two are not interchangeable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2171?\u003c\/strong\u003e The UPC for the Sierra 18-2171 Engine Coupler is 030999311757.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the engine coupler?\u003c\/strong\u003e The 18-2171 should be replaced if the existing coupler on a compatible GM engine is worn, cracked, or damaged, or during a transmission or outdrive service where the coupler is inspected.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105539803,"sku":"SIE-18-2171","price":248.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2171_lg__02766.1558121284.500.750.jpg?v=1785188134"},{"product_id":"sierra-18-2172-engine-coupler-replaces-mercruiser-14505a2-fits-gm-v-6-v-8-305-350-cid","title":"Sierra 18-2172 Engine Coupler, Replaces 14505A2, for GM V6\/V8 Engines with Triangular 3-Bolt Coupler","description":"\u003cp\u003eThe Sierra 18-2172 Engine Coupler is a triangular, 3-bolt engine coupler built for GM V6 and V8 marine engines, excluding MC-I, Alpha, and Bravo drive applications. It is the direct replacement for OEM number 14505A2, and also cross-references to 38965A1, 38965A2, and 76850A2.\u003c\/p\u003e\u003cp\u003eThis coupler is used specifically when converting an engine that has a 2-piece rear main seal with a 3-1\/2 inch crankshaft bolt pattern over to a newer engine design that uses a 1-piece rear main seal with a 3 inch bolt pattern. The triangular, 3-bolt hole layout matches the mounting pattern required for this rear main seal conversion, allowing the coupler to bridge the two bolt patterns correctly.\u003c\/p\u003e\u003cp\u003eThe 18-2172 is round in shape with a white finish and weighs 3.88 pounds. Sierra states that this part meets or exceeds the performance of the original equipment part it replaces, and it is backed by Sierra's limited 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 18-2172\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoupler Type:\u003c\/strong\u003e Triangular, 3-Bolt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Converts 2-piece rear main seal engine (3-1\/2 inch crankshaft bolt pattern) to 1-piece rear main seal engine (3 inch bolt pattern)\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 3.88 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999562463\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAll GM engines except MC-I, Alpha, and Bravo applications, with triangular, 3-bolt coupler\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e14505A2\u003c\/li\u003e\n\u003cli\u003e38965A1\u003c\/li\u003e\n\u003cli\u003e38965A2\u003c\/li\u003e\n\u003cli\u003e76850A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2172 engine coupler replace?\u003c\/strong\u003e It replaces OEM number 14505A2, and it also cross-references to 38965A1, 38965A2, and 76850A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines is the 18-2172 coupler designed for?\u003c\/strong\u003e The Sierra 18-2172 fits all GM engines except MC-I, Alpha, and Bravo drive applications, and is built for a triangular, 3-bolt coupler pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need this coupler instead of the original one?\u003c\/strong\u003e This coupler is needed when replacing a V6 or V8 engine that has a 2-piece rear main seal with a 3-1\/2 inch crankshaft bolt pattern with a newer engine that has a 1-piece rear main seal and a 3 inch bolt pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2172 coupler weigh?\u003c\/strong\u003e The Sierra 18-2172 engine coupler weighs 3.88 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is the coupler?\u003c\/strong\u003e The 18-2172 coupler is round in shape with a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2172 coupler a direct OEM replacement?\u003c\/strong\u003e Yes, it is a direct replacement for 14505A2 and cross-references to 38965A1, 38965A2, and 76850A2, matching the original triangular 3-bolt mounting pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is in the box with the Sierra 18-2172?\u003c\/strong\u003e One Sierra 18-2172 engine coupler, identified by UPC 030999562463.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2172 meet OEM performance standards?\u003c\/strong\u003e Yes, Sierra states that the 18-2172 meets or exceeds the performance of the original 14505A2 equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2172 on Alpha or Bravo drive engines?\u003c\/strong\u003e No, the 18-2172 is designed for GM engines and specifically excludes MC-I, Alpha, and Bravo drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2172 covered by warranty?\u003c\/strong\u003e Yes, the 18-2172 is covered under Sierra's limited warranty that applies to Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC does the 18-2172 coupler use?\u003c\/strong\u003e The Sierra 18-2172 engine coupler carries UPC 030999562463.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a 2-piece to 1-piece rear main seal conversion need a different coupler?\u003c\/strong\u003e Because the crankshaft bolt pattern changes from 3-1\/2 inch to 3 inch between the two rear main seal designs, and the 18-2172's triangular, 3-bolt pattern bridges that difference.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105605339,"sku":"SIE-18-2172","price":372.87,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2172_lg__25494.1558121506.500.750.jpg?v=1785189003"},{"product_id":"sierra-18-21753-engine-coupler-for-volvo-penta-5-0l-5-8l-1989-96-replaces-oem-3853862","title":"Sierra 18-21753 Engine Coupler, White, Replaces OMC 3853862 \/ Volvo 3853862-5, Fits Volvo Penta 50L \u0026 58L (1989-1996)","description":"\u003cp\u003eThe Sierra 18-21753 is a white engine coupler engineered as a direct-fit replacement for Volvo Penta 50L and 58L engines built between 1989 and 1996. The coupler connects the engine output to the drive system, transmitting rotational power while accommodating the slight misalignment inherent in the coupling joint. It is built to Sierra's OEM specification standard, so it installs the same way as the original coupler it replaces and restores proper power transfer between the engine and drive unit.\u003c\/p\u003e\u003cp\u003eThis coupler is a direct cross-reference match for the OMC 3853862, Volvo 3853862-5, and 985727 part numbers, making it a straightforward swap for boat owners and marine technicians replacing a worn, cracked, or failed original coupler. Because a coupler is a wear item subject to constant torque and vibration loads, replacing it with a part built to OEM spec helps ensure reliable engine-to-drive power transmission and reduces the risk of premature failure from an ill-fitting substitute.\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 18-21753\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 6.57 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Engines:\u003c\/strong\u003e Volvo Penta 50L \u0026amp; 58L (1989-1996)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 3853862, Volvo 3853862-5, 985727\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282186388\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVolvo Penta 50L (1989-1996)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 58L (1989-1996)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 3853862\u003c\/li\u003e\n\u003cli\u003eVolvo 3853862-5\u003c\/li\u003e\n\u003cli\u003e985727\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-21753 engine coupler fit?\u003c\/strong\u003e The Sierra 18-21753 fits Volvo Penta 50L and 58L engines built from 1989 to 1996.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-21753 replace?\u003c\/strong\u003e It cross-references to OMC 3853862, Volvo 3853862-5, and 985727, so any of those OEM numbers point to this same coupler.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-21753 engine coupler?\u003c\/strong\u003e It is finished in white, matching the original equipment coupler it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-21753 engine coupler weigh?\u003c\/strong\u003e The Sierra 18-21753 weighs 6.57 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-21753 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured replacement built to OEM specification, sold under the Sierra 18-21753 part number rather than under the original OMC or Volvo part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this coupler work if my engine data plate lists OMC 3853862?\u003c\/strong\u003e Yes, the Sierra 18-21753 is the direct cross-reference replacement for OMC 3853862.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-21753 also replace Volvo Penta part 985727?\u003c\/strong\u003e Yes, 985727 is one of the OEM numbers this Sierra coupler replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the engine coupler do?\u003c\/strong\u003e The 18-21753 connects the engine output to the drive system, transferring rotational power while accommodating minor misalignment at the coupling joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-21753 the same as the original coupler?\u003c\/strong\u003e Yes, since it is built to OEM specification and matches the original OMC 3853862 \/ Volvo 3853862-5 coupler, it installs using the same mounting arrangement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-21753?\u003c\/strong\u003e The order includes one Sierra 18-21753 white engine coupler.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this coupler fit engines outside the 1989-1996 range?\u003c\/strong\u003e The Sierra 18-21753 is specified for Volvo Penta 50L and 58L engines from 1989 to 1996; fitment outside that range is not confirmed.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105638107,"sku":"SIE-18-21753","price":444.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-21753__79046.1729786508.500.750.jpg?v=1785188911"},{"product_id":"sierra-18-2414-engine-coupler-for-mercruiser-165-170-180-190-470-488-3-7l-3-7lx-1983-1989-replaces-97432a2","title":"Sierra 18-2414 Engine Coupler, Replaces MerCruiser 97432A2, Fits 3.7L\/3.7LX S\/N 6170297 \u0026 Up (1983-1989)","description":"\u003cp\u003eThe Sierra 18-2414 is a metal engine coupler engineered as a direct replacement for the MerCruiser 97432A2 coupler. Mounted between the engine flywheel and the drive unit, the coupler is a wear item that transmits engine power to the outdrive, and it is designed to install as a drop-in swap using the same mounting configuration as the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003eThis coupler is built from metal for durability under the loads placed on the driveline, and it measures 6.5 x 6.5 x 7.5 inches at 4.32 pounds. It fits MerCruiser 165, 170, 470, and 3.7L engines with S\/N 6170297 and up (1983-1989), as well as MerCruiser 180, 190, 488, and 3.7LX engines with S\/N 6170297 and up (1983-1989). Confirm your engine's serial number falls within this range before ordering to ensure correct fitment.\u003c\/p\u003e\u003cp\u003eEach Sierra coupler is manufactured to meet or exceed the specifications of the original MerCruiser part, giving boat owners a reliable replacement option for scheduled maintenance or driveline 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 18-2414\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.32 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 6.5 x 6.5 x 7.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment 1:\u003c\/strong\u003e MerCruiser 165, 170, 470, 3.7L, S\/N 6170297 \u0026amp; Up (1983-1989)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment 2:\u003c\/strong\u003e MerCruiser 180, 190, 488, 3.7LX, S\/N 6170297 \u0026amp; Up (1983-1989)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 97432A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 165, 170, 470, 3.7L - S\/N 6170297 \u0026amp; Up (1983-1989)\u003c\/li\u003e\n\u003cli\u003eMerCruiser 180, 190, 488, 3.7LX - S\/N 6170297 \u0026amp; Up (1983-1989)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e97432A2\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2414 replace the MerCruiser 97432A2 coupler?\u003c\/strong\u003e Yes, the Sierra 18-2414 engine coupler is a direct replacement for the MerCruiser 97432A2, meeting or exceeding the original equipment specification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-2414 engine coupler fit?\u003c\/strong\u003e It fits MerCruiser 165, 170, 470, and 3.7L engines with S\/N 6170297 and up (1983-1989), and MerCruiser 180, 190, 488, and 3.7LX engines with S\/N 6170297 and up (1983-1989).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2414 coupler made of?\u003c\/strong\u003e The 18-2414 engine coupler is made of metal for durability under normal driveline loads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2414 engine coupler weigh?\u003c\/strong\u003e The Sierra 18-2414 weighs 4.32 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2414 coupler?\u003c\/strong\u003e It measures 6.5 x 6.5 x 7.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2414 a genuine OEM part or an aftermarket equivalent?\u003c\/strong\u003e The 18-2414 is a Sierra aftermarket coupler manufactured to meet or exceed the original MerCruiser 97432A2 part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-2414 will fit my MerCruiser engine?\u003c\/strong\u003e Check your engine's serial number; the 18-2414 coupler is designed for engines with S\/N 6170297 and up on the 165, 170, 470, 3.7L, 180, 190, 488, and 3.7LX models (1983-1989).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2414?\u003c\/strong\u003e One Sierra 18-2414 engine coupler is included per order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2414 be used on engines with a serial number below 6170297?\u003c\/strong\u003e The Sierra 18-2414 is specified for the listed MerCruiser engines with S\/N 6170297 and up; fitment below that serial number is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2414 cross-reference to?\u003c\/strong\u003e The 18-2414 engine coupler crosses to MerCruiser part number 97432A2.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106326235,"sku":"SIE-18-2414","price":522.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2414__71578.1737897759.500.750.jpg?v=1785188600"},{"product_id":"sierra-18-2747-drive-bellows-for-mercury-816431a1-mercruiser-r-mr-alpha-one-alpha-one-ss-sterndrives-1983-1990","title":"Sierra Drive Bellows 18-2747, Medium Size, Replaces Mercury Marine 816431A1","description":"\u003cp\u003eThe Sierra 18-2747 Drive Bellows is a medium-sized replacement bellows designed for stern drive applications, serving as a direct equivalent to Mercury Marine OEM part 816431A1. This bellows forms part of the sealing system between the transom and the outdrive, protecting the U-joint, driveshaft, and gimbal bearing assembly from water intrusion while allowing the drive unit to pivot and tilt during steering and trim operation. Over time, drive bellows are subject to constant flexing, exposure to fuel, oil, and saltwater or freshwater, which causes the rubber to deteriorate, crack, or lose its watertight seal -- a failed drive bellows is a common cause of water entering the boat's bilge through the drive unit. Replacing a worn or cracked bellows with the Sierra 18-2747 restores a proper watertight seal at this critical point in the drive train.\u003c\/p\u003e\u003cp\u003eSold as a single unit (package quantity of 1), the Sierra 18-2747 is manufactured to match the fit and function of the original Mercury Marine 816431A1 bellows, making it a straightforward drop-in replacement for boat owners and marine technicians servicing the drive shaft area of applicable stern 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 18-2747\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Drive Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.14 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 13.97 cm (L) x 13.97 cm (W) x 13.208 cm (H)\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 030999752956\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999752956\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 816431A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2747 drive bellows used for?\u003c\/strong\u003e It seals the connection between the transom and the outdrive on a stern drive unit, protecting the U-joint, driveshaft, and gimbal bearing area from water intrusion while allowing the drive to pivot and tilt.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the 18-2747 drive bellows?\u003c\/strong\u003e The 18-2747 is a medium-sized drive bellows, as designated in its listing title.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2747 replace?\u003c\/strong\u003e It replaces Mercury Marine part number 816431A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2747 drive bellows weigh?\u003c\/strong\u003e The Sierra 18-2747 drive bellows weighs 1.14 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-2747 bellows?\u003c\/strong\u003e The package measures 13.97 cm long by 13.97 cm wide by 13.208 cm high.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bellows come in the package?\u003c\/strong\u003e One drive bellows (18-2747) is included per package, matching the package quantity of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2747 manufactured?\u003c\/strong\u003e The 18-2747 drive bellows has a country of origin of Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2747 a genuine OEM part or a replacement equivalent?\u003c\/strong\u003e The 18-2747 is a Sierra-branded replacement bellows manufactured to match the fit and function of OEM Mercury Marine part 816431A1, rather than a Mercury-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the 18-2747 drive bellows?\u003c\/strong\u003e The UPC for the Sierra 18-2747 drive bellows is 030999752956.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would a drive bellows need to be replaced?\u003c\/strong\u003e Drive bellows like the 18-2747 flex constantly and are exposed to water and fuel, which over time causes the rubber to crack or lose its seal, allowing water to enter through the drive unit -- replacing it with the correct size, such as this medium 18-2747, restores the watertight seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111274203,"sku":"SIE-18-2747","price":55.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2747_lg__73991.1729096838.500.750.jpg?v=1785188948"},{"product_id":"sierra-18-2744-drive-bellows-kit-for-volvo-penta-aq200-290-sp-dp-replaces-oem-875826-876294-with-ridge","title":"Sierra 18-2744 Drive Bellows Kit, Replaces Volvo Penta 875848 876631, Fits AQ200-290 Series","description":"\u003cp\u003eThe Sierra 18-2744 Drive Bellows Kit is a replacement bellows assembly for Volvo Penta AQ-series sterndrive units. It is designed as a direct fitment replacement for the original Volvo Penta bellows, restoring the watertight seal between the transom and the outdrive on AQ200, AQ250, AQ270, AQ275, AQ280, AQ280DP, AQ290, and AQ290DP drive models. The kit is finished in black with a machined exterior finish and is sized Medium for its application.\u003c\/p\u003e\u003cp\u003eDrive bellows are a wear item on any sterndrive boat and should be inspected regularly for cracking, hardening, or splitting, since a failed bellows can allow water intrusion into the boat. The Sierra 18-2744 kit replaces Volvo Penta OEM part numbers 875848 and 876631, making it a straightforward swap for owners servicing these AQ-series drives. It weighs 0.72 pounds as packaged.\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 18-2744\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Drive Bellows Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\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 0.72 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999752925\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Teleflex Marine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Service Type:\u003c\/strong\u003e Marine Personal Craft\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\u003cul\u003e\n\u003cli\u003eVolvo Penta AQ200\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ250\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ270\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ275\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ280\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ280DP\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ290\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ290DP\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e875848\u003c\/li\u003e\n\u003cli\u003e876631\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2744 Drive Bellows Kit fit?\u003c\/strong\u003e The Sierra 18-2744 fits Volvo Penta AQ200, AQ250, AQ270, AQ275, AQ280, AQ280DP, AQ290, and AQ290DP sterndrive models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the 18-2744 replace?\u003c\/strong\u003e It replaces Volvo Penta OEM numbers 875848 and 876631.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is this bellows kit?\u003c\/strong\u003e The Sierra 18-2744 is listed in a Medium size for its Volvo Penta AQ-series application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and finish does the 18-2744 have?\u003c\/strong\u003e It has a black color with a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2744 bellows kit weigh?\u003c\/strong\u003e It weighs 0.72 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2744 an OEM Volvo Penta part or aftermarket?\u003c\/strong\u003e The 18-2744 is a Sierra-branded replacement part designed to replace Volvo Penta OEM bellows 875848 and 876631, rather than a Volvo Penta branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-2744 kit?\u003c\/strong\u003e The kit includes the drive bellows component for the applicable Volvo Penta AQ-series sterndrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2744 fit AQ280DP and AQ290DP drives?\u003c\/strong\u003e Yes, the fitment for the Sierra 18-2744 includes both the AQ280DP and AQ290DP models in addition to AQ200, AQ250, AQ270, AQ275, AQ280, and AQ290.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many units come in one Sierra 18-2744 kit?\u003c\/strong\u003e The kit is packaged as a single unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2744?\u003c\/strong\u003e The UPC for the Sierra 18-2744 Drive Bellows Kit is 030999752925.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111372507,"sku":"SIE-18-2744","price":65.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2744_lg__18449.1558123930.500.750.jpg?v=1785188470"},{"product_id":"u-joint-bellows-60932a4-for-mercruiser-alpha-one-mc-i-r-mr-tr-trs-sterndrives-1972-1990-sierra-18-2751","title":"Sierra 18-2751 U-Joint Bellows, Medium, Replaces Mercury Marine 60932A4, Fits Mercruiser TR\/TRS Drives","description":"\u003cp\u003eThe Sierra 18-2751 is a medium-size U-joint bellows built to seal the connection between the transom assembly and the drive unit on Mercruiser TR\/TRS stern drives, S\/N 3377316 and up. This bellows keeps water out of the u-joint and gimbal area while allowing the drive to pivot and steer, protecting the u-joint, gimbal bearing, and driveshaft from water intrusion and corrosion. It is a direct equivalent for the Mercury Marine OEM part 60932A4, so it installs using the same mounting points and hardware as the original bellows it replaces. The product ships as a single U-joint bellows and includes a clamp for installation. Sierra manufactures this part (produced by Teleflex Marine) to a round profile matching the original equipment shape, and it is sized specifically for the medium application used on TR\/TRS drives rather than the larger or smaller bellows used on other Mercruiser drive generations. Because stern drive bellows are wear items exposed to constant flexing, heat, and saltwater or freshwater immersion, replacing a cracked, torn, or hardened bellows before it fails is the standard way to prevent water from reaching the gimbal bearing, u-joints, and ultimately the engine. This bellows is sold under part number 18-2751 and should be matched to your drive's serial number 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 18-2751\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e U-Joint Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e U-Joint Bellows, Clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.37 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999312921\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999312921\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Teleflex Marine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser TR\/TRS drives, S\/N 3377316 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 60932A4\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2751 U-joint bellows fit?\u003c\/strong\u003e The 18-2751 is sized for Mercruiser TR\/TRS drives, serial number 3377316 and up, sealing the u-joint and gimbal area between the transom assembly and the drive unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2751 a direct replacement for Mercury Marine 60932A4?\u003c\/strong\u003e Yes, Sierra part 18-2751 replaces Mercury Marine OEM part 60932A4 and uses the same mounting configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the U-joint bellows weigh?\u003c\/strong\u003e The Sierra 18-2751 U-joint bellows weighs 1.37 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size bellows is this?\u003c\/strong\u003e This is the medium-size U-joint bellows in Sierra's 18-2751 lineup, matched specifically to TR\/TRS drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with part number 18-2751?\u003c\/strong\u003e The package includes one U-joint bellows and a clamp for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-2751 bellows?\u003c\/strong\u003e It has a round shape, matching the profile of the original equipment bellows on TR\/TRS drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho manufactures the 18-2751 bellows?\u003c\/strong\u003e It is a Sierra-branded part, manufactured by Teleflex Marine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a stern drive u-joint bellows need to be replaced?\u003c\/strong\u003e The bellows on a TR\/TRS drive flexes constantly and is exposed to water, so it cracks or hardens over time; a failed bellows lets water reach the u-joints and gimbal bearing, which is why Sierra offers 18-2751 as a preventive replacement part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2751 fit all Mercruiser drives?\u003c\/strong\u003e No, this specific part number is matched to Mercruiser TR\/TRS drives with serial number 3377316 and up; other Mercruiser drive generations use different Sierra bellows part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2751?\u003c\/strong\u003e The UPC for the Sierra 18-2751 U-joint bellows is 030999312921.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-2751 is a genuine Sierra-branded U-joint bellows, manufactured by Teleflex Marine, not a generic aftermarket substitute.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111470811,"sku":"SIE-18-2751","price":55.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__89356.1770739270.500.750.jpg?v=1785188911"},{"product_id":"sierra-18-2753-2-shift-cable-bellows-for-mercruiser-alpha-bravo-i-ii-iii-1-2-sterndrives-replaces-74639-clamp-included","title":"Sierra Shift Cable Bellows 18-2753-2, Black, Medium - Replaces Mercury Marine 74639, 74639A2","description":"\u003cp\u003eThe Sierra 18-2753-2 is a black, medium-size shift cable bellows designed to seal the point where the shift cable passes into the drive bell housing. It ships with a clamp for a secure installation. This bellows carries a universal fit across All #1 and #2 units, as well as Alpha, Bravo I, II, and III drives, and directly cross-references to Mercury Marine OEM part numbers 74639 and 74639A2, making it a straightforward replacement when the original bellows has cracked, hardened, or is allowing water intrusion at the drive housing.\u003c\/p\u003e\u003cp\u003eSierra also lists this bellows against specific drive model and serial number windows: the Blackhawk drive (1994-1995, S\/N 0F18677 and up), the II drive (1962-1969, S\/N 1474909-2671321), and the 215E drive (1970-1972, S\/N 2909035-2915034). The bellows measures 0.39 x 0.39 x 0.39 inches and weighs 0.12 pounds, with a machined exterior finish. All Sierra parts, including this bellows, are covered under Sierra's 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 18-2753-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 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\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282187729\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 74639, 74639A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAll #1, #2 units, Alpha, Bravo I, II, III\u003c\/li\u003e\n\u003cli\u003eBlackhawk drive, 1994-1995, S\/N 0F18677 and up\u003c\/li\u003e\n\u003cli\u003eII drive, 1962-1969, S\/N 1474909-2671321\u003c\/li\u003e\n\u003cli\u003e215E drive, 1970-1972, S\/N 2909035-2915034\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 74639\u003c\/li\u003e\n\u003cli\u003eMercury Marine 74639A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2753-2 shift cable bellows fit?\u003c\/strong\u003e This bellows has a universal fit for All #1 and #2 units, plus Alpha, Bravo I, II, and III drives. It is also listed for the Blackhawk drive (1994-1995, S\/N 0F18677 and up), the II drive (1962-1969, S\/N 1474909-2671321), and the 215E drive (1970-1972, S\/N 2909035-2915034).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2753-2 an OEM or aftermarket part?\u003c\/strong\u003e It is a Sierra aftermarket bellows that cross-references to Mercury Marine OEM part numbers 74639 and 74639A2, so it installs as a direct equivalent to the original bellows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and size is this bellows?\u003c\/strong\u003e The 18-2753-2 is black and sized medium, measuring 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the shift cable bellows weigh?\u003c\/strong\u003e Sierra part 18-2753-2 weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the 18-2753-2?\u003c\/strong\u003e The bellows ships with a clamp for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Mercury Marine part numbers does 18-2753-2 replace?\u003c\/strong\u003e It replaces Mercury Marine 74639 and 74639A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the fit differ between the Blackhawk, II, and 215E drives?\u003c\/strong\u003e Yes, each covers a different serial number window: the Blackhawk drive from S\/N 0F18677 and up (1994-1995), the II drive from S\/N 1474909-2671321 (1962-1969), and the 215E drive from S\/N 2909035-2915034 (1970-1972), so confirm your drive's serial number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish on this bellows?\u003c\/strong\u003e The 18-2753-2 has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2753-2?\u003c\/strong\u003e The UPC is 808282187729.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this bellows covered by a warranty?\u003c\/strong\u003e Yes, the 18-2753-2 is covered under Sierra's customer satisfaction warranty like all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a shift cable bellows used for?\u003c\/strong\u003e It forms a flexible seal around the shift cable where it enters the drive bell housing, which is what the 18-2753-2 is designed to do on compatible units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2753-2 fit a 215H or TR\/TRS drive?\u003c\/strong\u003e No, those drives use different bellows part numbers; the 18-2753-2 is specified for the Blackhawk, II, and 215E drives listed above along with the All #1, #2, Alpha, and Bravo I\/II\/III units.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111503579,"sku":"SIE-18-2753-2","price":15.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__32431.1753840675.500.750.jpg?v=1785188048"},{"product_id":"sierra-18-2752-u-joint-bellows-for-mercruiser-1-sterndrive-no-ridge-s-n-3443920-below-replaces-mercury-36223a2-clamp-included","title":"Sierra U-Joint Bellows 18-2752, Replaces Mercury Marine 36223A2, MerCruiser 215H\/215E Drives","description":"\u003cp\u003eThe Sierra 18-2752 U-Joint Bellows is a replacement sealing bellows for MerCruiser stern drive units, designed to keep water out of the U-joint and gimbal area where the drive shaft passes through the transom assembly. As the flexible boot ages, cracks or splits, it allows water intrusion that can corrode and damage the U-joint, gimbal bearing, and coupler, so a cracked or hardened bellows should be replaced before it fails. This bellows is built by Sierra to fit specific MerCruiser drive applications by serial number range, and the correct part is confirmed by matching your drive model and serial number to the fitment listed below rather than by appearance alone.\u003c\/p\u003e\u003cp\u003eThe bellows is constructed of metal and finished in white, and it installs with the correct clamp for a secure, watertight seal; a matching 18-7316 clamp is included with this bellows. It is intended for MerCruiser #1 drive units without a ridge, serial number 3443920 and below, and is commonly used during routine bellows replacement service or when servicing the gimbal housing on applicable MerCruiser drives.\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 18-2752\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\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 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.38 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e 18-7316 clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999312938\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 36223A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 215H drives, model year 1970, serial number range 2782203-2909034\u003c\/li\u003e\n\u003cli\u003eMerCruiser 215E drives, model years 1970-1972, serial number range 2909035-2915034\u003c\/li\u003e\n\u003cli\u003eMerCruiser #1 drive units without a ridge, serial number 3443920 and below\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 36223A2\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2752 U-Joint Bellows fit?\u003c\/strong\u003e The 18-2752 fits MerCruiser 215H drives from 1970 (serial number range 2782203-2909034) and MerCruiser 215E drives from 1970-1972 (serial number range 2909035-2915034), as well as MerCruiser #1 drive units without a ridge at serial number 3443920 and below.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2752 bellows equivalent to an OEM Mercury Marine part?\u003c\/strong\u003e Yes, Sierra 18-2752 is a replacement equivalent for Mercury Marine part number 36223A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a U-joint bellows used for?\u003c\/strong\u003e A U-joint bellows is a flexible boot that seals the drive shaft and U-joint where they pass through the transom assembly on a MerCruiser stern drive, keeping water out of the U-joint, gimbal bearing, and coupler.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2752 bellows made from?\u003c\/strong\u003e The Sierra 18-2752 U-Joint Bellows is made of metal and finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2752 bellows weigh?\u003c\/strong\u003e The Sierra 18-2752 U-Joint Bellows weighs 1.38 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2752 bellows?\u003c\/strong\u003e The Sierra 18-2752 U-Joint Bellows measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2752 come with a clamp?\u003c\/strong\u003e Yes, an 18-7316 clamp is included with the Sierra 18-2752 U-Joint Bellows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy should I replace a cracked U-joint bellows?\u003c\/strong\u003e A cracked or split bellows on a MerCruiser drive lets water reach the U-joint, gimbal bearing, and coupler, leading to corrosion and drive damage, so the Sierra 18-2752 should be replaced as soon as damage is found.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-2752 is the correct bellows for my drive?\u003c\/strong\u003e Confirm your MerCruiser drive model and serial number against the fitment for 18-2752: 215H drives from 1970 (S\/N 2782203-2909034) or 215E drives from 1970-1972 (S\/N 2909035-2915034).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2752 a genuine Sierra part or aftermarket?\u003c\/strong\u003e Sierra 18-2752 is manufactured by Sierra as a replacement part and is covered under Sierra's standard limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range applies to MerCruiser #1 drive units for this bellows?\u003c\/strong\u003e For MerCruiser #1 drive units without a ridge, the Sierra 18-2752 applies to serial number 3443920 and below.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111536347,"sku":"SIE-18-2752","price":60.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2752_lg__69573.1729094563.500.750.jpg?v=1785188355"},{"product_id":"sierra-18-2756-u-joint-bellows-for-mercruiser-stern-drives-replaces-oem-86840a3","title":"Sierra 18-2756 U-Joint Bellows for Mercruiser Bravo I\/II\/III and Blackhawk Stern Drives","description":"\u003cp\u003eThe Sierra 18-2756 U-Joint Bellows is a molded replacement boot that seals the U-joint housing on select MerCruiser stern drives, keeping water out of the drive shaft area and gear lubricant in. It is built from a combination of plastic and rubber for flexibility at the joint while withstanding constant exposure to water and marine grease. The bellows is finished in black and ships as a single unit, ready to install as part of routine stern drive maintenance or as a replacement when the original bellows has cracked, hardened, or begun to leak.\u003c\/p\u003e\u003cp\u003eThis bellows is designed for MerCruiser Bravo I, Bravo II, and Bravo III drives built 1988 and newer with serial number 0B664190 and up, and for MerCruiser Blackhawk drives from 1994-1995 with serial number 0F18677 and up. On both drive families it is used together with the corresponding upper drive bellows and the shared middle bellows as part of a full bellows replacement, which is the standard practice anytime one bellows on the drive is replaced. Keeping the U-joint bellows in good condition is important preventive maintenance, since a torn or deteriorated bellows can allow water intrusion that leads to corrosion and premature U-joint or gimbal bearing failure.\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 18-2756\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic, Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction Type:\u003c\/strong\u003e Molded\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 0.68 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999621542\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser Bravo I\/II\/III, 1988 \u0026amp; Newer, S\/N 0B664190 \u0026amp; Up\u003c\/li\u003e\n\u003cli\u003eMercruiser Blackhawk, 1994-1995, S\/N 0F18677 \u0026amp; Up\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2756 U-Joint Bellows fit?\u003c\/strong\u003e It fits Mercruiser Bravo I\/II\/III stern drives built 1988 and newer with serial number 0B664190 and up, and Mercruiser Blackhawk drives from 1994-1995 with serial number 0F18677 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a U-joint bellows used for?\u003c\/strong\u003e The U-joint bellows, part number 18-2756, is a molded boot that seals the U-joint housing on the stern drive, keeping water out and lubricant in around the U-joint area.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-2756 bellows made of?\u003c\/strong\u003e It is molded from a combination of plastic and rubber, finished in black, giving it the flexibility needed at the joint while standing up to constant water and grease exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2756 U-Joint Bellows weigh?\u003c\/strong\u003e The Sierra 18-2756 U-Joint Bellows weighs 0.68 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bellows come in the package?\u003c\/strong\u003e One U-Joint Bellows, part number 18-2756, ships per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to check my drive's serial number before ordering?\u003c\/strong\u003e Yes. The 18-2756 bellows applies to Bravo I\/II\/III drives from S\/N 0B664190 and up and Blackhawk drives from S\/N 0F18677 and up, so confirming your drive's serial number ensures correct fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the U-joint bellows be replaced with the other drive bellows?\u003c\/strong\u003e It is standard practice to replace all of the stern drive bellows together, since the 18-2756 U-joint bellows works alongside the drive's other bellows and they tend to wear out around the same time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are signs the U-joint bellows needs to be replaced?\u003c\/strong\u003e Cracking, hardening, or splitting in the bellows material, or visible water intrusion in the drive shaft area, indicate the U-joint bellows should be replaced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2756 bellows a Mercruiser Blackhawk part or a Bravo part?\u003c\/strong\u003e It is used on both: Mercruiser Bravo I\/II\/III drives (1988 \u0026amp; Newer, S\/N 0B664190 \u0026amp; Up) and Mercruiser Blackhawk drives (1994-1995, S\/N 0F18677 \u0026amp; Up).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2756 U-Joint Bellows?\u003c\/strong\u003e The bellows is black.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111765723,"sku":"SIE-18-2756","price":63.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__46831.1753840676.500.750.jpg?v=1785188090"},{"product_id":"shift-cable-bellows-for-omc-cobra-sterndrive-replaces-omc-911826-sierra-18-2763","title":"Sierra Shift Cable Bellows 18-2763, Replaces OMC 911826, Fits All Cobra Sterndrives","description":"\u003cp\u003eThe Sierra 18-2763 Shift Cable Bellows is a shift cable seal designed to keep water out of the shift cable passage on All Cobra sterndrive units. It seals the point where the shift cable passes through the transom or drive housing, protecting the linkage and internal components from water intrusion that can lead to corrosion and shift cable failure. This part is a direct cross-reference for OMC 911826, so it installs as a like-for-like replacement on the applications it covers.\u003c\/p\u003e\u003cp\u003eSierra manufactures this bellows to meet or exceed the specifications of the original equipment part it replaces, making it a straightforward replacement when the factory bellows has cracked, hardened, or is leaking. It is compact and lightweight for easy handling during a shift cable service, and its fitment is limited to All Cobra applications, so confirm your drive model 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 18-2763\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Shift Cable Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e All Cobra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 911826\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 2 x 6 x 7.12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999313034\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAll Cobra\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e911826\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2763 Shift Cable Bellows fit?\u003c\/strong\u003e The Sierra 18-2763 Shift Cable Bellows is designed for All Cobra sterndrive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2763 bellows the same as OMC 911826?\u003c\/strong\u003e Yes, part number 18-2763 is a direct cross-reference for OMC 911826 and installs as a like-for-like replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this shift cable bellows weigh?\u003c\/strong\u003e The Sierra 18-2763 Shift Cable Bellows weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2763 bellows?\u003c\/strong\u003e Product dimensions for the 18-2763 Shift Cable Bellows are 2 x 6 x 7.12 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the shift cable bellows on my Cobra sterndrive?\u003c\/strong\u003e A cracked, hardened, or leaking bellows should be replaced right away, since a failed shift cable bellows on a Cobra drive allows water to reach the shift cable and cause corrosion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this bellows genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-2763 is a genuine Sierra part manufactured to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this part fit sterndrives other than Cobra?\u003c\/strong\u003e No, the 18-2763 Shift Cable Bellows is specified for All Cobra applications only; it is not listed for other drive lines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-2763?\u003c\/strong\u003e Ordering 18-2763 gets you one Sierra Shift Cable Bellows sized for All Cobra sterndrive shift cable applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2763 bellows require any other parts to install?\u003c\/strong\u003e The listing covers the Shift Cable Bellows itself, part number 18-2763; no other components are specified in the fitment data for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs part number 18-2763 still available from Sierra?\u003c\/strong\u003e Yes, the Sierra 18-2763 Shift Cable Bellows is a currently produced, non-discontinued part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988112158939,"sku":"SIE-18-2763","price":12.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2763__51651.1737821120.500.750.jpg?v=1785189112"},{"product_id":"sierra-18-2765-u-joint-bellows-for-omc-cobra-sx-dp-s-cone-clutch-drives-1986-1993-replaces-omc-3854127","title":"Sierra 18-2765 U-Joint Bellows for Volvo Penta DP-S, SX Stern Drives, Replaces 3854127","description":"\u003cp\u003eThe Sierra 18-2765 U-Joint Bellows is a direct-fit replacement bellows designed for Volvo Penta DP-S and SX stern drives. It seals the universal joint area of the drive, keeping water out of the u-joint and gimbal housing while allowing the drive's flexing movement needed for steering and trim. Over time the original rubber bellows on a stern drive hardens, cracks, or splits from age and exposure to water and fuel residue, which lets water intrude into the u-joint housing and leads to corrosion and premature bearing failure. Replacing a failed bellows with the 18-2765 restores the watertight seal and helps protect the u-joint and gimbal bearing from water damage.\u003c\/p\u003e\u003cp\u003eThis bellows is also used as the replacement Bellows component within Sierra's u-joint\/gimbal bearing service kit, alongside a Gimbal Bearing (Sierra 18-2100, O.E. 3853807) and a second Bellows (Sierra 18-1074), for a complete u-joint area reseal. The 18-2765 corresponds to O.E. Part number 3854127.\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 18-2765\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Drive Models:\u003c\/strong\u003e DP-S, SX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.83 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999313058\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\u003cul\u003e\n\u003cli\u003eVolvo Penta DP-S stern drive\u003c\/li\u003e\n\u003cli\u003eVolvo Penta SX stern drive\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3854127\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2765 U-Joint Bellows fit?\u003c\/strong\u003e The 18-2765 is designed for Volvo Penta DP-S and SX stern drives, sealing the u-joint area of those drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2765 replace?\u003c\/strong\u003e It replaces OEM part number 3854127 on applicable Volvo Penta DP-S and SX stern drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2765 U-Joint Bellows weigh?\u003c\/strong\u003e The Sierra 18-2765 U-Joint Bellows weighs 0.83 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bellows come in one package?\u003c\/strong\u003e One Sierra 18-2765 U-Joint Bellows is included per unit, with a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a u-joint bellows need to be replaced?\u003c\/strong\u003e A bellows like the 18-2765 seals the u-joint housing against water intrusion; once the original bellows cracks or hardens with age, water can reach the u-joint and gimbal bearing and cause corrosion, so replacement with 18-2765 restores the seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2765 bellows part of a larger service kit?\u003c\/strong\u003e Yes, the 18-2765 Bellows is used as a component within a u-joint and gimbal bearing service kit that also includes a Sierra 18-2100 Gimbal Bearing (O.E. 3853807) and a Sierra 18-1074 Bellows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2765?\u003c\/strong\u003e The UPC for the Sierra 18-2765 U-Joint Bellows is 030999313058.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2765 fit both DP-S and SX drives the same way?\u003c\/strong\u003e Yes, the same Sierra 18-2765 Bellows fits both the Volvo Penta DP-S and SX stern drive models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2765 an OEM or aftermarket part?\u003c\/strong\u003e The Sierra 18-2765 is an aftermarket bellows manufactured to replace OEM part number 3854127 on Volvo Penta DP-S and SX drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I replace just the bellows without replacing the gimbal bearing?\u003c\/strong\u003e Yes, the 18-2765 is sold as an individual Bellows and can be installed on its own, though it is also compatible for use alongside the 18-2100 Gimbal Bearing when servicing the full u-joint area.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988112191707,"sku":"SIE-18-2765","price":43.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2765_lg__63699.1558125190.500.750.jpg?v=1785188131"},{"product_id":"sierra-18-2771-bellows-kit-for-omc-cobra-without-cone-clutch-replaces-oem-3854270-u-joint-exhaust-bellows-gasket-set-clamp","title":"Sierra 18-2771 Bellows Kit, OEM 3854270 Replacement for OMC Cobra Sterndrive Without Cone Clutch","description":"\u003cp\u003eThe Sierra 18-2771 Bellows Kit is a complete replacement bellows and gasket package built for OMC Cobra sterndrives without a cone clutch. Bellows are one of the most critical wear items on a sterndrive: they seal the connection between the transom and the outdrive, keeping water out of the boat and out of the drive's u-joint and exhaust passages while allowing the drive to steer and tilt. Over time the rubber in these bellows hardens and cracks from heat, fuel, and UV exposure, which is the leading cause of water intrusion and corrosion damage in sterndrive boats.\u003c\/p\u003e\u003cp\u003eThis kit bundles the components needed to reseal the drive in one job rather than sourcing each bellows and gasket separately: an exhaust bellows, a u-joint bellows, and an outdrive gasket set. Sierra manufactures its bellows and gasket products to meet or exceed the original equipment they replace, so the fit and sealing performance match what the OMC Cobra drive was designed around. Installing all three components together at the same time is the standard practice for this job, since they wear out on a similar schedule and the outdrive typically has to come off the boat to access any one of them.\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 18-2771\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Bellows Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e OMC Cobra without cone clutch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Exhaust Bellows, U-Joint Bellows, Outdrive Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 3854270\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.69 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8.75 x 9.75 x 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282100896\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC Cobra sterndrive without cone clutch\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3854270\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2771 Bellows Kit fit?\u003c\/strong\u003e This kit is built for the OMC Cobra sterndrive without a cone clutch. It is not a universal bellows kit, so confirm your drive is the non-cone-clutch Cobra configuration before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this kit replace?\u003c\/strong\u003e The Sierra 18-2771 kit replaces OEM number 3854270 on the OMC Cobra sterndrive without cone clutch.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-2771 bellows kit?\u003c\/strong\u003e The kit contains an exhaust bellows, a u-joint bellows, and an outdrive gasket set, giving you the parts needed to reseal the drive in one job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2771 Bellows Kit weigh?\u003c\/strong\u003e The complete kit weighs 3.69 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the packaged kit?\u003c\/strong\u003e The Sierra 18-2771 Bellows Kit measures 8.75 x 9.75 x 8 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy do sterndrive bellows need to be replaced?\u003c\/strong\u003e Bellows are rubber seals that harden and crack over time from heat and UV exposure. Once cracked, they let water into the boat and drive, so the exhaust and u-joint bellows in the 18-2771 kit are typically replaced on a regular maintenance interval.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the exhaust bellows, u-joint bellows, and gasket set be replaced together?\u003c\/strong\u003e Yes, and that is why they are bundled in the Sierra 18-2771 kit. Since the outdrive has to be removed to access these parts, replacing all three at once avoids doing the job twice.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2771 kit genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket kit engineered to meet or exceed the OEM part it replaces, OEM number 3854270, rather than an original OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit work on a Cobra sterndrive with a cone clutch?\u003c\/strong\u003e No, the 18-2771 kit is specified for the OMC Cobra without a cone clutch. A cone-clutch equipped Cobra uses a different bellows kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of this bellows kit a DIY job?\u003c\/strong\u003e Installing the 18-2771 kit requires removing the outdrive from the transom to access the bellows and gasket set, which is a more involved job best suited to someone comfortable with sterndrive service or a marine technician.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988112650459,"sku":"SIE-18-2771","price":169.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2771_lg__86387.1558122548.500.750.jpg?v=1785188232"},{"product_id":"sierra-18-6406-marine-u-joint-for-mercruiser-stern-drive-gkn-series-serial-ol100009-and-up-replaces-mercury-865493a01","title":"Sierra 18-6406 U-Joint Assembly, Replaces 865493A01\/865496A01, for Mercruiser Alpha I, Alpha I SS \u0026 Bravo Stern Drives","description":"\u003cp\u003eThe Sierra 18-6406 U-Joint Assembly is a replacement universal joint built for Mercruiser stern drive units, connecting the drive shaft to the transmission and lower unit so power transfers smoothly through the drive's articulation points. A worn or failing U-joint can cause vibration, clunking, or play in the drive train, and replacing it with a properly fitted assembly like the 18-6406 restores smooth, reliable power transfer.\u003c\/p\u003e\u003cp\u003eThis assembly includes both a straight and a 90 degree grease fitting, giving the installer flexibility to choose the fitting orientation that best suits the access and grease gun setup on the specific installation. It is designed to fit Mercruiser Alpha I units from serial number B418819 and above, as well as Alpha I SS and Bravo drives, making it a common service part for these Mercruiser drive families.\u003c\/p\u003e\u003cp\u003eThe 18-6406 cross-references directly to Mercury Marine OEM part numbers, so it can be used as a like-for-like replacement on applicable Mercruiser units without altering fit or function versus the original equipment 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 18-6406\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e U-Joint Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Straight grease fitting and 90 degree grease fitting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercruiser Alpha I (S\/N B418819 and above), Alpha I SS, Bravo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282182618\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser Alpha I units, serial number B418819 and above\u003c\/li\u003e\n\u003cli\u003eMercruiser Alpha I SS\u003c\/li\u003e\n\u003cli\u003eMercruiser Bravo\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e865496A01\u003c\/li\u003e\n\u003cli\u003e865493A01\u003c\/li\u003e\n\u003cli\u003e865510T\u003c\/li\u003e\n\u003cli\u003e865511T\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-6406 U-Joint Assembly fit?\u003c\/strong\u003e It is designed for Mercruiser Alpha I units with serial number B418819 and above, as well as Mercruiser Alpha I SS and Bravo stern drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the 18-6406 replace?\u003c\/strong\u003e The 18-6406 replaces Mercury Marine OEM numbers 865496A01, 865493A01, 865510T, and 865511T.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-6406 a direct equivalent to the Mercury Marine 865493A01 and 865496A01 U-joints?\u003c\/strong\u003e Yes, the Sierra 18-6406 U-Joint Assembly cross-references directly to Mercury Marine 865493A01 and 865496A01, so it installs as a like-for-like replacement on applicable Mercruiser drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat grease fittings come with this U-joint assembly?\u003c\/strong\u003e The 18-6406 U-Joint Assembly includes both a straight grease fitting and a 90 degree grease fitting, so the installer can choose whichever orientation fits the available access.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-6406 U-Joint Assembly weigh?\u003c\/strong\u003e The Sierra 18-6406 U-Joint Assembly weighs 1.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this U-joint work on any Mercruiser Alpha I drive?\u003c\/strong\u003e It fits Mercruiser Alpha I units from serial number B418819 and above; earlier serial number Alpha I units are not covered by this listing, so check the drive's serial number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-6406 fit Bravo drives as well as Alpha units?\u003c\/strong\u003e Yes, in addition to Alpha I (S\/N B418819 and above) and Alpha I SS, the 18-6406 U-Joint Assembly also fits Mercruiser Bravo drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6406 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-6406 is a Sierra-branded replacement U-joint assembly engineered to replace the listed Mercury Marine OEM numbers, rather than a Mercury-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with the 18-6406 U-Joint Assembly?\u003c\/strong\u003e The assembly ships complete with the U-joint and its two grease fittings, a straight fitting and a 90 degree fitting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the U-joint on my Mercruiser stern drive?\u003c\/strong\u003e A worn U-joint assembly like the one replaced by the Sierra 18-6406 can develop play or wear at the drive shaft connection, and replacing it restores proper alignment and power transfer between the transmission and the lower drive unit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988357460187,"sku":"SIE-18-6406","price":125.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-6406_lg__35158.1558129377.500.750.jpg?v=1785189100"},{"product_id":"sierra-18-6401-yoke-assembly-for-mercruiser-1-r-mr-alpha-one-gen-ii-1971-1997-replaces-814819a2-59830a5-59829a1","title":"Sierra U-Joint Assembly 18-6401 for Mercruiser, Replaces Mercury Marine 864244A2, 12784A10","description":"\u003cp\u003eThe Sierra U-Joint Assembly, part number 18-6401, is a machined replacement universal joint assembly engineered for Mercruiser sterndrive applications. It is designed as a direct cross-reference replacement for Mercury Marine universal joint assemblies, allowing boat owners and marine technicians to restore proper drive-line articulation between the engine coupler and the sterndrive without sourcing a discontinued or hard-to-find OEM part.\u003c\/p\u003e\u003cp\u003eThis U-joint assembly features a machined exterior finish for consistent fit and smooth operation under the torsional loads typical of sterndrive power transfer. It is built to Sierra's standard for Mercruiser U-joint and yoke components, making it a straightforward swap for technicians already familiar with servicing Mercruiser drive-line hardware.\u003c\/p\u003e\u003cp\u003eBecause drive-line components like this carry significant rotational load, the assembly is constructed as a substantial, solid unit rather than a lightweight stamped part. Boat owners replacing a worn, notchy, or failed U-joint should confirm their existing part matches the Sierra 18-6401 or one of its OEM cross-reference numbers 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 18-6401\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e U-Joint Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser U-Joints and Yokes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 10.94 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\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282111830\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 864244A2, 12784A10\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Mercruiser sterndrive U-joint and yoke applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e864244A2\u003c\/li\u003e\n\u003cli\u003e12784A10\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is Sierra part number 18-6401?\u003c\/strong\u003e It is a U-Joint Assembly designed for Mercruiser sterndrive applications, providing the universal joint connection used in the drive-line between the engine coupler and the sterndrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-6401 replace Mercury Marine parts?\u003c\/strong\u003e Yes, the Sierra 18-6401 U-Joint Assembly cross-references to Mercury Marine part numbers 864244A2 and 12784A10.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-6401 U-Joint Assembly weigh?\u003c\/strong\u003e The Sierra 18-6401 U-Joint Assembly weighs 10.94 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-6401 U-Joint Assembly?\u003c\/strong\u003e The listed product dimensions for the Sierra 18-6401 are 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-6401 U-Joint Assembly have?\u003c\/strong\u003e The Sierra 18-6401 has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6401 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-6401 is an aftermarket U-Joint Assembly manufactured by Sierra as a direct cross-reference to Mercury Marine OEM part numbers 864244A2 and 12784A10.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat application is the 18-6401 U-Joint Assembly used for?\u003c\/strong\u003e It is categorized for Mercruiser U-joints and yokes, used in the sterndrive coupling of Mercruiser-equipped boats.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the Sierra 18-6401 U-Joint Assembly?\u003c\/strong\u003e If your existing U-joint assembly carries the Mercury Marine part number 864244A2 or 12784A10, or shows wear such as play or roughness in the joint, the Sierra 18-6401 is the correct cross-reference replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-6401 currently in production?\u003c\/strong\u003e Yes, the Sierra 18-6401 U-Joint Assembly is not discontinued by the manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-6401 U-Joint Assembly?\u003c\/strong\u003e The UPC for the Sierra 18-6401 U-Joint Assembly is 808282111830.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988359426267,"sku":"SIE-18-6401","price":609.68,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-6401__33486.1741557358__05481.1753473616.500.750.jpg?v=1785189211"},{"product_id":"bellows-clamp-for-mercruiser-bellows-replaces-54-38863-package-of-5-sierra-18-7321-9","title":"Sierra Bellows Clamp 18-7321-9 for 18-7321 Shift Cable Assembly, Replaces 54-38863, Pack of 5","description":"\u003cp\u003eThe Sierra 18-7321-9 is a bellows clamp designed for use with the Sierra 18-7321 shift cable assembly. It secures the bellows boot around the shift cable where it passes through the bell housing, keeping the seal tight against water intrusion at the connection point. This clamp is sold as a package of 5, giving you enough on hand to complete a full clamp replacement or keep spares for future service without having to reorder mid-job.\u003c\/p\u003e\u003cp\u003eBuilt in stainless steel, the clamp resists corrosion in the marine environment where it is installed, holding up to constant exposure to moisture, salt spray, and engine bay heat. It is a direct cross-reference match for the OEM numbers 54-38863, 54-866507, and 54-8M0090424, so it installs the same way and performs the same sealing function as those original clamps.\u003c\/p\u003e\u003cp\u003eThis is a small, low-cost, frequently replaced part: bellows clamps age, lose tension, or corrode over time, and a loose or failed clamp can let water past the bellows seal. Replacing the clamp along with the bellows itself, or on its own if only the clamp has failed, is a straightforward maintenance step for anyone servicing a shift cable 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 18-7321-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5\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 808282165802\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Bellows clamp for the Sierra 18-7321 shift cable assembly\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eSized for the bellows on the Sierra 18-7321 shift cable assembly.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e54-38863\u003c\/li\u003e\n\u003cli\u003e54-866507\u003c\/li\u003e\n\u003cli\u003e54-8M0090424\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-7321-9 bellows clamp fit?\u003c\/strong\u003e The 18-7321-9 clamp is sized for the bellows boot on the Sierra 18-7321 shift cable assembly, where the cable passes through the bell housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many clamps come in a package?\u003c\/strong\u003e The Sierra 18-7321-9 is sold as a package of 5 clamps, not a single unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7321-9 clamp a direct replacement for OEM clamps?\u003c\/strong\u003e Yes, it cross-references directly to OEM numbers 54-38863, 54-866507, and 54-8M0090424, so it fits and seals the same way as those originals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-7321-9 bellows clamp made from?\u003c\/strong\u003e It is made of stainless steel, chosen for corrosion resistance in the marine environment where the shift cable bellows is installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7321-9 clamp weigh?\u003c\/strong\u003e Each package of the Sierra 18-7321-9 bellows clamps weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the bellows clamp on a shift cable assembly?\u003c\/strong\u003e Replace the clamp on the 18-7321 shift cable assembly if it has lost tension, corroded, or if the bellows boot it secures is being replaced, since a loose clamp can allow water past the seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-7321-9 clamp with a different shift cable assembly?\u003c\/strong\u003e The 18-7321-9 is designed for the Sierra 18-7321 shift cable assembly bellows; check that any other assembly uses a compatible bellows size before substituting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any tools to install the 18-7321-9 bellows clamp?\u003c\/strong\u003e Standard hand tools such as a screwdriver or clamp driver are typically used to tighten this style of bellows clamp around the boot; no specialty tools are required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-7321-9?\u003c\/strong\u003e You receive a package of 5 Sierra 18-7321-9 stainless steel bellows clamps; the shift cable assembly and bellows boot are not included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7321-9 genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra-branded part manufactured to replace and cross-reference OEM clamps 54-38863, 54-866507, and 54-8M0090424 directly.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988383477979,"sku":"SIE-18-7321-9","price":10.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-7321-9__58612.1737827713.500.750.jpg?v=1785329151"},{"product_id":"sierra-18-9847-bellows-expander-tool-for-mercruiser-alpha-one-bravo-one-two-blackhawk-drives-replaces-mercury-91-45497a1","title":"Sierra 18-9847 Bellows Expander Tool - Replaces Mercury Marine 91-45497A1 for MC-I, R-MR, Alpha One, Bravo One\/Two, Blackhawk Drive Units","description":"\u003cp\u003eThe Sierra 18-9847 Bellows Expander Tool is a specialty installation tool built to install exhaust bellows on MC-I, R-MR, Alpha One, Bravo One and Two, and Blackhawk drive units. Exhaust bellows are a common wear item on sterndrive boats, and getting a new bellows seated correctly over the gimbal housing and transom assembly requires expanding it evenly without tearing or distorting the rubber. This tool is designed specifically for that job, giving technicians and DIY boat owners a repeatable way to stretch the bellows into place during a drive unit service or bellows replacement.\u003c\/p\u003e\u003cp\u003eConstructed from alloy steel for durability under repeated shop use, the 18-9847 measures 15.75 x 5.25 x 3.25 inches and weighs 0.75 pounds, making it easy to store with other drive unit service tools. It is manufactured to meet or exceed the fit and function of the original equipment tool it replaces, so it drops into the same service procedures used for these Mercury MerCruiser drive units. Whether you are replacing a torn exhaust bellows, a shift cable bellows, or servicing the gimbal ring during a routine drive unit teardown, this expander tool is sized for the bellows used on the drive units listed below.\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 18-9847\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Bellows Expander Tool\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 15.75 x 5.25 x 3.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.75 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Specialty Tools\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282109554\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e Mercury Marine 91-45497A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eInstalls exhaust bellows on MC-I, R-MR, Alpha One, Bravo One and Two, and Blackhawk drive units.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 91-45497A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat drive units does the Sierra 18-9847 fit?\u003c\/strong\u003e The Sierra 18-9847 Bellows Expander Tool installs exhaust bellows on MC-I, R-MR, Alpha One, Bravo One and Two, and Blackhawk drive units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this tool replace?\u003c\/strong\u003e It replaces Mercury Marine part number 91-45497A1, so it is a direct swap for that original tool in the same bellows installation procedure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-9847 made of?\u003c\/strong\u003e The tool is made of alloy steel, giving it the rigidity needed to expand exhaust bellows without deforming under repeated use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Bellows Expander Tool?\u003c\/strong\u003e The Sierra 18-9847 measures 15.75 x 5.25 x 3.25 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-9847 weigh?\u003c\/strong\u003e It weighs 0.75 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-9847 is a Sierra-branded specialty tool manufactured to meet or exceed the original equipment tool it replaces, Mercury Marine 91-45497A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat job does a bellows expander tool actually do?\u003c\/strong\u003e It stretches a new exhaust bellows over the gimbal housing and transom assembly so it seats evenly during drive unit installation, which is exactly what the Sierra 18-9847 is designed for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-9847 on an Alpha One drive unit?\u003c\/strong\u003e Yes, the Sierra 18-9847 is listed for use on Alpha One drive units in addition to MC-I, R-MR, Bravo One and Two, and Blackhawk units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this tool?\u003c\/strong\u003e You receive one Sierra 18-9847 Bellows Expander Tool.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this tool work on Bravo Two drive units?\u003c\/strong\u003e Yes, installing exhaust bellows on Bravo Two drive units is one of the applications listed for the Sierra 18-9847.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-9847 covered under warranty?\u003c\/strong\u003e Sierra parts, including the 18-9847 Bellows Expander Tool, are covered under Sierra's standard product warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988437709019,"sku":"SIE-18-9847","price":59.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-9847_lg__35991.1558133161.500.750.jpg?v=1785187976"},{"product_id":"sea-dog-521630-motor-well-boot-3-black-molded-rubber-accordion-cable-seal-with-mounting-ring","title":"Sea-Dog Motor Well Boot, 3 Inch, Black Molded Rubber, Part 521630","description":"\u003cp\u003eThe Sea-Dog Motor Well Boot (521630) organizes and protects engine control cables, wires, or fuel lines as they pass through the transom or motor well of a boat. It uses a black, accordion-style seal design that flexes with steering and throttle cable movement while keeping water and spray out of the boat. The boot includes a mounting ring for a secure, finished installation and is constructed of UV stabilized molded rubber, so it resists sun exposure, cracking, and saltwater without becoming brittle over time.\u003c\/p\u003e\u003cp\u003eThis boot measures 3 inches at dimension A and 3\/16 inch at dimension B, and it installs using #8 RH fasteners (fasteners are not included). It is a bulk\/display item packaged individually. Because it is a universal cable and wire boot rather than an engine-specific part, it is not tied to a particular make, model, or year of boat or outboard, and it works on any application where cables or lines need a protected pass-through with a flexible rubber seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sea-Dog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 521630\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Motor Well Boot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e UV Stabilized Molded Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter (A):\u003c\/strong\u003e 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight (B):\u003c\/strong\u003e 3\/16 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Type:\u003c\/strong\u003e #8 RH (not included)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Mounting ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 035514521031\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUniversal cable and wire pass-through boot; not limited to a specific make, model, or year.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sea-Dog 521630 Motor Well Boot used for?\u003c\/strong\u003e It organizes and protects engine control cables, wires, or fuel lines as they pass through a boat's motor well or transom, sealing out water while allowing the cables to flex.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is this motor well boot?\u003c\/strong\u003e The Sea-Dog 521630 measures 3 inches at its base (dimension A) and 3\/16 inch at dimension B.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sea-Dog 521630 boot made from?\u003c\/strong\u003e It is constructed of UV stabilized molded rubber, which resists sun exposure and saltwater without becoming brittle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 521630 boot include a mounting ring?\u003c\/strong\u003e Yes, the Sea-Dog Motor Well Boot 521630 includes a mounting ring for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre fasteners included with the 521630 Motor Well Boot?\u003c\/strong\u003e No, fasteners are not included. The boot is designed to install with #8 RH fasteners, which must be purchased separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sea-Dog 521630 Motor Well Boot weigh?\u003c\/strong\u003e It weighs 0.06 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this boot fit any boat make or model?\u003c\/strong\u003e The Sea-Dog 521630 is a universal cable and wire pass-through boot, so it is not restricted to a specific boat make, model, or engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 521630 Motor Well Boot?\u003c\/strong\u003e It is black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the Sea-Dog 521630 boot different from Sea-Dog's Split Motor Well Boot?\u003c\/strong\u003e The standard 521630 boot is a closed, one-piece accordion seal that cables must be threaded through during installation, while Sea-Dog's Split Motor Well Boot is cut so it can be installed around cables without disconnecting them.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the boot's design style?\u003c\/strong\u003e The 521630 uses a black, accordion-style seal that flexes with cable and steering movement while maintaining a watertight barrier.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 521630 Motor Well Boot sold individually?\u003c\/strong\u003e Yes, the Sea-Dog 521630 is packaged as an individual unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sea-Dog 521630 Motor Well Boot?\u003c\/strong\u003e The UPC for the Sea-Dog Motor Well Boot, part number 521630, is 035514521031.\u003c\/p\u003e","brand":"Sea-Dog","offers":[{"title":"Default Title","offer_id":48988826206427,"sku":"S-D-521630","price":2.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/5295.jpg?v=1784429765"},{"product_id":"sea-dog-521655-motor-well-boot-5-1-2-black-rubber-accordion-cable-seal-with-mounting-ring-10-pack","title":"Sea-Dog 521655 Motor Well Boot, 5-1\/2 Inch, Black Rubber, 10-Pack","description":"\u003cp\u003eThe Sea-Dog 521655 Motor Well Boot organizes and protects engine control cables, wires, or fuel lines where they pass through a boat's transom or motor well. The black accordion-style seal flexes with cable and wire movement while keeping water, spray, and debris out of the motor well, helping prevent corrosion and chafe damage to the cables and wiring it surrounds. It is constructed of UV stabilized molded rubber, which resists sun and saltwater exposure and keeps the boot flexible instead of cracking or hardening over time.\u003c\/p\u003e\u003cp\u003eA mounting ring is included with the boot to secure it in place during installation. The boot installs using #8 RH fasteners, which are not included and must be sourced separately. This listing is the 5-1\/2 inch boot, sold as a 10-pack, making it a practical option for boat builders, repair shops, or owners maintaining multiple boats or replacing several worn boots at once.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sea-Dog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 521655\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Motor Well Boot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimension A (Diameter):\u003c\/strong\u003e 5-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimension B:\u003c\/strong\u003e 9\/16 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Size:\u003c\/strong\u003e #8 RH (not included)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.36 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Pack Quantity:\u003c\/strong\u003e 10 each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e UV Stabilized Molded Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Accordion-style seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Mounting ring\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sea-Dog 521655 Motor Well Boot used for?\u003c\/strong\u003e The Sea-Dog 521655 Motor Well Boot organizes and protects engine control cables, wires, or fuel lines as they pass through a boat's motor well, shielding them from water and debris.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is this motor well boot?\u003c\/strong\u003e The Sea-Dog 521655 measures 5-1\/2 inches at dimension A and 9\/16 inch at dimension B.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sea-Dog 521655 boot?\u003c\/strong\u003e It is black, matching the accordion-style seal design typical of Sea-Dog motor well boots.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sea-Dog 521655 Motor Well Boot made of?\u003c\/strong\u003e It is constructed of UV stabilized molded rubber, which resists sun and saltwater exposure and stays flexible over time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sea-Dog 521655 come with a mounting ring?\u003c\/strong\u003e Yes, a mounting ring is included with the Sea-Dog 521655 Motor Well Boot.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat fasteners are needed to install the Sea-Dog 521655?\u003c\/strong\u003e Installation requires #8 RH fasteners, which are not included with the Sea-Dog 521655 Motor Well Boot and must be purchased separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many boots come in this package?\u003c\/strong\u003e The Sea-Dog 521655 is sold as a 10-pack.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sea-Dog 521655 Motor Well Boot weigh?\u003c\/strong\u003e The Sea-Dog 521655 has a listed weight of 0.36 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sea-Dog 521655 a solid or split boot?\u003c\/strong\u003e The 521655 is a solid molded rubber motor well boot, not the split version, which is a separate Sea-Dog part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sea-Dog 521655 be used for fuel lines as well as cables?\u003c\/strong\u003e Yes, the Sea-Dog 521655 Motor Well Boot is designed to organize and protect engine control cables, wires, or fuel lines passing through the motor well.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sea-Dog 521655 boot hold up in saltwater conditions?\u003c\/strong\u003e Its UV stabilized molded rubber construction is built to resist sun and saltwater exposure, which helps the 521655 boot stay durable in marine environments.\u003c\/p\u003e","brand":"Sea-Dog","offers":[{"title":"Default Title","offer_id":48988826304731,"sku":"S-D-521655","price":10.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/5295_f2fff355-6366-4619-b63f-632e4e866398.jpg?v=1784429774"},{"product_id":"gimbal-bearing-for-volvo-penta-blackhawk-sterndrive-1994-1995-cross-reference-18-21001-grease-lubricated-ball-bearing","title":"Engineered Marine Products Gimbal Bearing 30-00803, Volvo Penta Stern Drive, Ball Bearing","description":"\u003cp\u003eThe Engineered Marine Products Gimbal Bearing, part number 30-00803, is a ball-type gimbal bearing built to OEM specification for Volvo Penta stern drive applications. The gimbal bearing sits in the gimbal housing and supports the drive shaft coupling between the engine and the outdrive, transmitting engine rotation to the lower unit while allowing the drive to steer and tilt. A worn or failed gimbal bearing is a common source of drive-shaft vibration, coupler wear, and steering play, so replacing it with a properly rated bearing is important to protect the rest of the drivetrain.\u003c\/p\u003e\u003cp\u003eThis unit is constructed from metal components and uses a ball bearing design rated to OEM specification, and it is lubricated with marine bearing grease. It measures 4 x 1.62 x 4 inches, matching the compact footprint required to fit inside the gimbal housing bore. Engineered Marine Products has manufactured OEM-standard marine drivetrain components for over 40 years, engineering and sourcing parts to deliver reliable, competitively priced replacements for both OEM and aftermarket channels. The package includes the gimbal bearing itself, ready to install in place of a worn or damaged unit, and it carries a 1 year warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Engineered Marine Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 30-00803\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4 x 1.62 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Ball Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification Met:\u003c\/strong\u003e OEM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Gimbal Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.183 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 840080434018\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 year\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Engineered Marine Products 30-00803 gimbal bearing fit?\u003c\/strong\u003e The 30-00803 gimbal bearing is designed for Volvo Penta stern drive applications, seating in the gimbal housing to support the drive shaft coupling between the engine and the outdrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 30-00803 gimbal bearing built to OEM specification?\u003c\/strong\u003e Yes, the Engineered Marine Products 30-00803 gimbal bearing is manufactured to meet OEM specification, using a ball bearing design in place of the original unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this gimbal bearing?\u003c\/strong\u003e The 30-00803 gimbal bearing measures 4 x 1.62 x 4 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 30-00803 gimbal bearing weigh?\u003c\/strong\u003e It weighs 1.183 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Engineered Marine Products gimbal bearing made from?\u003c\/strong\u003e The 30-00803 gimbal bearing is made from metal components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of bearing is used in part number 30-00803?\u003c\/strong\u003e A ball bearing is used, which is the standard design for Volvo Penta-style gimbal bearings in this application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat lubricant should be used with this gimbal bearing?\u003c\/strong\u003e The 30-00803 gimbal bearing is designed to be lubricated with marine bearing grease.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 30-00803?\u003c\/strong\u003e The order includes one gimbal bearing, ready to install into the gimbal housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 30-00803 gimbal bearing come with a warranty?\u003c\/strong\u003e Yes, Engineered Marine Products backs the 30-00803 gimbal bearing with a 1 year warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a gimbal bearing needs replacement?\u003c\/strong\u003e Drive-shaft vibration, coupler wear, and steering play can indicate a worn gimbal bearing; replacing it with the 30-00803 restores proper support for the drive shaft coupling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho manufactures part number 30-00803?\u003c\/strong\u003e It is manufactured by Engineered Marine Products, a company that has produced OEM-standard marine drivetrain components for over 40 years.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991285018843,"sku":"EMP-30-00803","price":76.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP-30-00803-MerCruiser-Volvo_Gimbal-Bearing__21316.1722363374.500.750.jpg?v=1785188672"},{"product_id":"transom-service-kit-for-mercruiser-r-mr-alpha-one-sterndrives-replaces-30-803097t1-bellows-gimbal-bearing-seals-61-08397","title":"Engineered Marine Products Transom Service Kit 61-08397, Replaces 30-803097T1, Fits Mercruiser R, MR, Alpha One Drives","description":"\u003cp\u003eThe Engineered Marine Products Transom Service Kit (61-08397) is a complete bellows and gimbal bearing service kit for Mercruiser sterndrive units, built to restore a watertight, properly aligned transom assembly during routine drive service or bellows replacement. The kit is a direct replacement for OEM part 30-803097T1 and fits Mercruiser R, MR, and Alpha One drives (1983-90, S\/N 6225577 and up) as well as Alpha One SS drives (1986-89, S\/N OA 545004 and up).\u003c\/p\u003e\u003cp\u003eInside the kit you get the two core wear components that fail most often during a transom service: a gimbal bearing (cross-referencing to OEM 30-60794A4 and 30-60794A2) that supports the drive shaft and must be replaced any time the bellows are serviced, and a U-joint bellows (cross-referencing to OEM 60932A4) that seals the U-joint area against water intrusion. The kit's components carry a machined exterior finish for a precise, factory-style fit. Weighing 4.583 pounds and measuring 12 x 6 x 6 inches as packaged, the kit is sized for a standard transom service job without requiring separate part-by-part ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Engineered Marine Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 61-08397\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Type:\u003c\/strong\u003e Transom Service Kit (Bellows Kit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.583 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 12 x 6 x 6 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 840080483375\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Gimbal Bearing (18-2100), U-Joint Bellows (18-2751)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGimbal Bearing Cross-Reference:\u003c\/strong\u003e 30-60794A4, 30-60794A2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-Joint Bellows Cross-Reference:\u003c\/strong\u003e 60932A4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser R, MR, Alpha One (1983-90), S\/N 6225577 and up\u003c\/li\u003e\n\u003cli\u003eMercruiser Alpha One SS (1986-89), S\/N OA 545004 and up\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e30-803097T1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Engineered Marine Products transom service kit 61-08397 include?\u003c\/strong\u003e Kit 61-08397 includes a gimbal bearing (18-2100) and a U-joint bellows (18-2751), the two components typically replaced together during a Mercruiser transom service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Mercruiser drives does this kit fit?\u003c\/strong\u003e This kit fits Mercruiser R, MR, and Alpha One drives (1983-90, S\/N 6225577 and up) and Alpha One SS drives (1986-89, S\/N OA 545004 and up).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 61-08397 replace?\u003c\/strong\u003e Transom service kit 61-08397 replaces OEM Mercruiser part 30-803097T1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the gimbal bearing in this kit compatible with OEM part numbers?\u003c\/strong\u003e Yes, the gimbal bearing included in kit 61-08397 cross-references to OEM part numbers 30-60794A4 and 30-60794A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM number does the U-joint bellows in this kit cross-reference to?\u003c\/strong\u003e The U-joint bellows included in kit 61-08397 cross-references to OEM part number 60932A4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 61-08397 transom service kit weigh?\u003c\/strong\u003e The kit weighs 4.583 pounds as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the packaged dimensions of this kit?\u003c\/strong\u003e Kit 61-08397 measures 12 x 6 x 6 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Mercruiser part or an aftermarket kit?\u003c\/strong\u003e 61-08397 is an Engineered Marine Products kit, an aftermarket equivalent to OEM part 30-803097T1, not an original Mercruiser-branded kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace both the gimbal bearing and U-joint bellows during a transom service?\u003c\/strong\u003e Kit 61-08397 bundles both the gimbal bearing (18-2100) and U-joint bellows (18-2751) because both are commonly serviced together on Mercruiser R, MR, and Alpha One drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish do the components in this kit have?\u003c\/strong\u003e The components in the 61-08397 kit have a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this kit fit an Alpha One SS drive?\u003c\/strong\u003e Yes, kit 61-08397 fits Mercruiser Alpha One SS drives from 1986-89 with S\/N OA 545004 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this transom service kit?\u003c\/strong\u003e The UPC for Engineered Marine Products transom service kit 61-08397 is 840080483375.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991291343067,"sku":"EMP-61-08397","price":202.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP_61-08397_MerCruiser_Transom_Service_Kit__87278.1729003550.500.750.jpg?v=1785189139"},{"product_id":"transom-bellows-service-kit-for-omc-cobra-without-cone-clutch-replaces-3854270","title":"Engineered Marine Products Bellows Kit 18-2771, Replaces 3854270, for OMC Cobra without Cone Clutch","description":"\u003cp\u003eThis Engineered Marine Products Bellows Kit (18-2771) is a complete transom service kit built for OMC Cobra sterndrives without a cone clutch. It bundles the sealing and bellows components needed to service the transom assembly in one purchase, saving the time and guesswork of sourcing gaskets and bellows separately. The kit is engineered to OEM standards and is designed as a direct equivalent to OEM number 3854270, so it installs the way the original part did without modification.\u003c\/p\u003e\u003cp\u003eInside the kit you get an Outdrive Gasket Set (18-2613), a U-Joint Bellows (18-2765, equivalent to OE numbers 983973 and 987467), and an Exhaust Bellows (18-2764), covering the main wear points that fail during a transom or bellows service on this application. Engineered Marine Products has supplied both OEM and marine aftermarket channels for over 40 years, sourcing and engineering components to hold up to marine duty at a competitive price point.\u003c\/p\u003e\u003cp\u003eThis kit fits OMC Cobra sterndrives without a cone clutch. Because bellows and gasket kits are drive-specific, confirm your drive does not use a cone clutch before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Engineered Marine Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 61-08715\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Type:\u003c\/strong\u003e Bellows Kit (Transom Service Kit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e OMC Cobra without cone clutch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.361 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 12 x 6 x 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Outdrive Gasket Set (18-2613), U-Joint Bellows (18-2765), Exhaust Bellows (18-2764)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 3854270\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC Cobra without cone clutch\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3854270\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Engineered Marine Products Bellows Kit 61-08715?\u003c\/strong\u003e The kit includes an Outdrive Gasket Set (18-2613), a U-Joint Bellows (18-2765), and an Exhaust Bellows (18-2764), covering the main components needed for a transom bellows service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the 61-08715 bellows kit fit?\u003c\/strong\u003e This kit is designed for OMC Cobra sterndrives without a cone clutch.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit work on an OMC Cobra with a cone clutch?\u003c\/strong\u003e No, the 61-08715 kit is specified for OMC Cobra without cone clutch; a drive with a cone clutch requires a different kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this kit replace?\u003c\/strong\u003e The Engineered Marine Products Bellows Kit 61-08715 (catalog stem 18-2771) replaces OEM number 3854270.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the U-Joint Bellows in this kit equivalent to an OEM part?\u003c\/strong\u003e Yes, the U-Joint Bellows (18-2765) included in this kit is equivalent to OE numbers 983973 and 987467.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 61-08715 bellows kit weigh?\u003c\/strong\u003e The kit weighs 3.361 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of this bellows kit?\u003c\/strong\u003e It ships in a package measuring 12 x 6 x 6 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this kit made by the original equipment manufacturer or an aftermarket brand?\u003c\/strong\u003e Engineered Marine Products manufactures the 61-08715 kit to OEM standards as an aftermarket equivalent, not a re-boxed OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include an exhaust bellows and a gasket set, or only the U-joint bellows?\u003c\/strong\u003e It includes all three: the Outdrive Gasket Set (18-2613), U-Joint Bellows (18-2765), and Exhaust Bellows (18-2764), not just one component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does this bellows kit have?\u003c\/strong\u003e The 61-08715 kit is listed with a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my drive needs the without-cone-clutch version of this kit?\u003c\/strong\u003e The 61-08715 kit is built specifically for OMC Cobra drives without a cone clutch, so confirm your drive's clutch configuration before ordering to get the correct kit.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991291441371,"sku":"EMP-61-08715","price":171.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP-61-08715-Volvo--OMC-Bellows-Kit__34075.1731699084.500.750.jpg?v=1785189169"},{"product_id":"heavy-duty-u-joint-for-mercruiser-alpha-i-bravo-sterndrives-replaces-75832-mpn-94-01821","title":"Engineered Marine Products Heavy Duty U-Joint 94-01821, Marine Drive U-Joint","description":"\u003cp\u003eThe Engineered Marine Products Heavy Duty U-Joint, part number 94-01821, is a machined universal joint built for marine drive applications where reliable torque transfer between drive components is critical. It is manufactured to OEM standards, giving boat owners and marine technicians a dependable replacement option for drive-line service without compromising on fit or durability. The joint features a machined exterior finish for a precise, consistent fit, and its compact dimensions make it suitable for standard marine u-joint service work. Engineered Marine Products has supplied both OEM and marine aftermarket channels for over 40 years, sourcing and engineering drive parts designed to hold up under the vibration, torque, and saltwater exposure typical of marine u-joint service. This u-joint is categorized within Volvo Penta u-joint and gimbal bearing drive components, making it a relevant option when servicing drive-line assemblies of that type. Whether performing routine maintenance or replacing a worn or failed joint, this heavy duty u-joint is built to restore smooth, reliable power transfer in the drive coupling.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Engineered Marine Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 94-01821\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint (Heavy Duty)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 4 x 1.62 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.173 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication Category:\u003c\/strong\u003e Volvo Penta U-Joints and Gimbal Bearings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is part number 94-01821?\u003c\/strong\u003e 94-01821 is the Engineered Marine Products Heavy Duty U-Joint, a machined universal joint designed for marine drive-line service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this u-joint?\u003c\/strong\u003e The Engineered Marine Products 94-01821 u-joint measures 4 x 1.62 x 4 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 94-01821 u-joint weigh?\u003c\/strong\u003e It weighs 1.173 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does this u-joint have?\u003c\/strong\u003e The 94-01821 u-joint has a machined exterior finish for a precise, consistent fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this u-joint built to OEM standards?\u003c\/strong\u003e Yes, the Engineered Marine Products Heavy Duty U-Joint 94-01821 is manufactured to OEM standards for reliable drive-line performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of marine drive part is this?\u003c\/strong\u003e The 94-01821 u-joint falls under Volvo Penta u-joints and gimbal bearing drive components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho manufactures the 94-01821 u-joint?\u003c\/strong\u003e Engineered Marine Products, a company that has served both OEM and marine aftermarket channels for over 40 years, manufactures this heavy duty u-joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the u-joint made of?\u003c\/strong\u003e The 94-01821 u-joint has a machined construction, giving it a precise, durable fit for marine drive-line applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace a u-joint like this?\u003c\/strong\u003e A drive-line u-joint such as the 94-01821 typically needs replacement when it shows wear, vibration, or failure in the drive coupling during routine maintenance or repair.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 94-01821 u-joint suitable for regular maintenance use?\u003c\/strong\u003e Yes, this heavy duty u-joint is designed for both routine maintenance and replacement of worn or failed joints in marine drive-line service.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991293243611,"sku":"EMP-94-01821","price":55.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP_94-01821_MerCruiser_Volvo_U-Joint__88490.1722518319.500.750.jpg?v=1785188332"},{"product_id":"heavy-duty-u-joint-94-00801-replaces-75832-fits-mercruiser-1-alpha-one-tr-trs-ii-ssm-sterndrives","title":"Engineered Marine Products Heavy Duty U-Joint 94-00801, Replaces 75832, Fits Alpha One \u0026 TR\/TRS Units","description":"\u003cp\u003eThe Engineered Marine Products 94-00801 is a heavy duty U-joint built to handle the torque and shock loads of a marine stern drive coupling. It is machined for a precise fit and includes both a straight and a 90 degree grease fitting, so it can be serviced with a standard grease gun regardless of how the drive is oriented in the boat. This U-joint is designed as a direct replacement for worn or failed factory joints on #1 and Alpha One drive units within serial number range 1684188-B418818, as well as TR\/TRS and II SSM units.\u003c\/p\u003e\u003cp\u003eA U-joint transmits rotational power through an angle, and in a stern drive it is the critical link that lets the drive tilt and trim while still delivering engine power to the propeller shaft. Because this component takes constant load and vibration, Engineered Marine Products manufactures the 94-00801 to heavy duty specifications rather than a lighter passenger-vehicle-style joint. It is a common maintenance and rebuild item for boat owners servicing their drive coupler or replacing a joint showing wear, looseness, or corrosion.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Engineered Marine Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 94-00801\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Heavy Duty U-Joint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.185 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 4 x 4 x 1.63 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrease Fittings:\u003c\/strong\u003e Includes both straight and 90 degree grease fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 840080442839\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 75832, 75832A2, 75832T, 758321, 75832T1, 75832A1, 75832A3, 58749, 41431, 36312\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits all #1 and Alpha One units, serial numbers 1684188-B418818\u003c\/li\u003e\n\u003cli\u003eAlso fits TR\/TRS units\u003c\/li\u003e\n\u003cli\u003eAlso fits II SSM units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e75832\u003c\/li\u003e\n\u003cli\u003e75832A2\u003c\/li\u003e\n\u003cli\u003e75832T\u003c\/li\u003e\n\u003cli\u003e758321\u003c\/li\u003e\n\u003cli\u003e75832T1\u003c\/li\u003e\n\u003cli\u003e75832A1\u003c\/li\u003e\n\u003cli\u003e75832A3\u003c\/li\u003e\n\u003cli\u003e58749\u003c\/li\u003e\n\u003cli\u003e41431\u003c\/li\u003e\n\u003cli\u003e36312\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Engineered Marine Products 94-00801 U-joint fit?\u003c\/strong\u003e The 94-00801 U-joint fits all #1 and Alpha One drive units within serial number range 1684188-B418818, and also fits TR\/TRS and II SSM units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this U-joint a direct replacement for part number 75832?\u003c\/strong\u003e Yes, the 94-00801 U-joint replaces OEM part 75832 along with its variants 75832A2, 75832T, 758321, 75832T1, 75832A1, and 75832A3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other OEM numbers does the 94-00801 U-joint cross-reference to?\u003c\/strong\u003e Beyond the 75832 series, the 94-00801 also cross-references to OEM numbers 58749, 41431, and 36312.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this U-joint weigh?\u003c\/strong\u003e The Engineered Marine Products 94-00801 U-joint weighs 1.185 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 94-00801 U-joint?\u003c\/strong\u003e The 94-00801 measures 4 x 4 x 1.63 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the U-joint come with grease fittings?\u003c\/strong\u003e Yes, the 94-00801 includes both a straight grease fitting and a 90 degree grease fitting for servicing after installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this considered a heavy duty U-joint?\u003c\/strong\u003e Yes, the 94-00801 is manufactured to a heavy duty specification for use in stern drive couplings that see high torque and vibration loads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exterior finish on this U-joint?\u003c\/strong\u003e The 94-00801 has a machined exterior finish for a precise, accurate fit within the drive coupler.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this U-joint fit a TR\/TRS drive unit?\u003c\/strong\u003e Yes, in addition to #1 and Alpha One units, the 94-00801 U-joint is designed to fit TR\/TRS drive units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 94-00801 fit II SSM units?\u003c\/strong\u003e Yes, the 94-00801 U-joint is also designed to fit II SSM units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 94-00801 U-joint?\u003c\/strong\u003e Ordering the 94-00801 gets you one Engineered Marine Products heavy duty U-joint with both a straight and a 90 degree grease fitting already fitted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the serial number range matter for the 94-00801 U-joint?\u003c\/strong\u003e The 94-00801 is built to fit #1 and Alpha One units specifically within serial number range 1684188-B418818, so checking your drive's serial number against that range confirms correct fitment.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991293276379,"sku":"EMP-94-00801","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP_94-00801_MerCruiser-Volvo_U-Joint__61879.1722350567.500.750.jpg?v=1785188616"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/collections\/5295_1d2d3005-6aa6-413c-b770-7246d499595b.jpg?v=1785356960","url":"https:\/\/www.goodvibesmarina.com\/collections\/gvcat-propellers-drive-lower-unit-u-joints-bellows-shift-components-u-joints-bellows.oembed?page=2","provider":"Good Vibes Marina","version":"1.0","type":"link"}