{"title":"Water Pump Housings \u0026 Base Kits","description":null,"products":[{"product_id":"sierra-18-3116-water-pump-housing-for-mercury-mercruiser-outboards-replaces-46-96148a1","title":"Sierra 18-3116 Water Pump Housing for MerCruiser Alpha One Sterndrives, Replaces 46-96148A1","description":"\u003cp\u003eThe Sierra 18-3116 Water Pump Housing is a direct-fit replacement housing for MerCruiser sterndrive and inboard cooling systems, designed to restore proper raw water circulation through the water pump assembly. Molded from durable plastic, this housing forms the outer body of the water pump and works together with the impeller, face plate, and related pump components to draw and route cooling water to the engine. It is engineered to meet or exceed the specifications of the original equipment part it replaces, giving boat owners a reliable option for water pump rebuilds and maintenance.\u003c\/p\u003e\u003cp\u003eThis housing is used across multiple MerCruiser sterndrive generations identified by unit serial number range, including units without a flush screw in the gear housing and MR\/Alpha I configurations. Because water pump housings differ by drive generation and gearcase design, buyers should confirm their unit's serial number range or drive designation before ordering to ensure correct fitment. The 18-3116 pairs with related Sierra water pump components such as the 18-3109 water tube guide and 18-3110 water pump housing bushing, and is commonly installed as part of a full water pump kit during routine impeller service or cooling system overhaul.\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 18-3116\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.46 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Water Pumps and Impellers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315519\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e GLM 12410, Mallory 9-43211, Mercury\/Mercruiser 46-96148A1, 46-96148T1, 46-64141A1, 46-48743A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser units, serial number range 2495186-2763441\u003c\/li\u003e\n\u003cli\u003eMerCruiser units without flush screw in gear housing, serial number range 2763442-6854392\u003c\/li\u003e\n\u003cli\u003eMerCruiser MR\/Alpha I, serial number range 6854393-0D594568\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 12410\u003c\/li\u003e\n\u003cli\u003eMallory 9-43211\u003c\/li\u003e\n\u003cli\u003eMercury\/Mercruiser 46-96148A1\u003c\/li\u003e\n\u003cli\u003e46-96148T1\u003c\/li\u003e\n\u003cli\u003e46-64141A1\u003c\/li\u003e\n\u003cli\u003e46-48743A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3116 used for?\u003c\/strong\u003e The Sierra 18-3116 is a water pump housing that forms the outer body of the water pump on applicable MerCruiser sterndrive units, routing raw cooling water through the pump assembly to the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3116 a direct replacement for the Mercury\/MerCruiser 46-96148A1?\u003c\/strong\u003e Yes, the Sierra 18-3116 water pump housing is interchangeable with Mercury\/MerCruiser 46-96148A1, along with 46-96148T1, 46-64141A1, and 46-48743A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-3116 housing made from?\u003c\/strong\u003e This water pump housing is made from plastic, matching the material used in the original equipment component it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3116 water pump housing weigh?\u003c\/strong\u003e The Sierra 18-3116 weighs 0.46 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3116 fit any MerCruiser sterndrive?\u003c\/strong\u003e No, fitment depends on unit serial number range and drive configuration; the 18-3116 applies to serial ranges 2495186-2763441, 2763442-6854392 (units without a flush screw in the gear housing), and 6854393-0D594568 (MR\/Alpha I units), so confirming your unit's serial number is recommended before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other parts does the 18-3116 work with?\u003c\/strong\u003e The 18-3116 housing is designed to pair with the Sierra 18-3109 water tube guide and 18-3110 water pump housing bushing, and is included in Sierra water pump kits such as the 18-3314, 18-3316, 18-3317, 18-3319, 18-3320, and 18-3321.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3116 come with the impeller included?\u003c\/strong\u003e No, the Sierra 18-3116 is the housing component only; the impeller and other wear parts are sold separately or as part of a complete water pump kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre GLM 12410 and Mallory 9-43211 the same part as the Sierra 18-3116?\u003c\/strong\u003e GLM 12410 and Mallory 9-43211 are interchangeable cross-reference numbers for the same water pump housing as the Sierra 18-3116.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3116 genuine OEM or aftermarket?\u003c\/strong\u003e The 18-3116 is a Sierra aftermarket replacement part manufactured to meet or exceed the specifications of the original MerCruiser equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-3116 be used on units with a flush screw in the gear housing?\u003c\/strong\u003e The 18-3116 is listed for units without a flush screw in the gear housing as well as certain earlier and MR\/Alpha I serial ranges; units retro-fitted with an Alpha-style lower unit require Alpha-style parts instead.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988140601563,"sku":"SIE-18-3116","price":39.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3116_lg__54180.1558125169.500.750.jpg?v=1785188912"},{"product_id":"water-pump-housing-for-yamaha-outboard-replaces-oem-61a-44311-00-00-sierra-18-3173-1","title":"Sierra Water Pump Housing 18-3173-1, Replaces 61A-44311-00-00, 61A-44311-01-00","description":"\u003cp\u003eThe Sierra Water Pump Housing 18-3173-1 is a replacement water pump housing for Yamaha two-stroke outboard motors. The housing is the structural body of the outboard's cooling water pump, mounting the impeller and directing raw water flow to keep the engine's cooling system operating correctly. Replacing a cracked, worn, or corroded water pump housing is a standard part of outboard lower unit water pump service and helps prevent overheating caused by a failing pump assembly.\u003c\/p\u003e\u003cp\u003eSierra manufactures this housing as a direct cross-reference to the original Yamaha part numbers listed below, making it a straightforward like-for-like replacement during a water pump rebuild or lower unit service. It is sold as the housing component only.\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 18-3173-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282362102\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.62 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Water Pumps and Impellers, Two-Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 61A-44311-00-00, 61A-44311-01-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Water Pump Housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Yamaha two-stroke outboard motors.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e61A-44311-00-00\u003c\/li\u003e\n\u003cli\u003e61A-44311-01-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3173-1 water pump housing used for?\u003c\/strong\u003e The Sierra 18-3173-1 is a water pump housing for Yamaha two-stroke outboard motors, serving as the body that holds the impeller and directs raw cooling water through the pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-3173-1 replace?\u003c\/strong\u003e It cross-references to Yamaha OEM numbers 61A-44311-00-00 and 61A-44311-01-00, so either original number matches this Sierra housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the water pump housing include the impeller?\u003c\/strong\u003e No, the Sierra 18-3173-1 is the housing component only; the impeller and other pump service parts are sold separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3173-1 water pump housing weigh?\u003c\/strong\u003e It weighs 0.62 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3173-1 a genuine Yamaha part or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket replacement housing, built to cross-reference directly with Yamaha OEM part numbers 61A-44311-00-00 and 61A-44311-01-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat outboard motors is the 18-3173-1 housing compatible with?\u003c\/strong\u003e The 18-3173-1 water pump housing is designed for Yamaha two-stroke outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-3173-1 to replace a cracked or corroded water pump housing?\u003c\/strong\u003e Yes, replacing a cracked or corroded housing with the Sierra 18-3173-1 is a common fix during outboard water pump service to restore proper cooling water flow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-3173-1?\u003c\/strong\u003e The order includes one Sierra water pump housing, part number 18-3173-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-3173-1 the same as Sierra part 18-3170 or 18-3171?\u003c\/strong\u003e No, 18-3170 and 18-3171 are separate Sierra water pump housing part numbers with their own distinct OEM cross-references; only 18-3173-1 replaces Yamaha 61A-44311-00-00 and 61A-44311-01-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the water pump housing need replacing during a pump service?\u003c\/strong\u003e Over time the housing can crack, wear, or corrode from heat and water exposure, which can allow cooling water to leak or bypass the impeller; installing a Sierra 18-3173-1 housing addresses this during a full pump rebuild.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988140994779,"sku":"SIE-18-3173-1","price":23.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3173-1__82423.1737864364.500.750.jpg?v=1785188437"},{"product_id":"sierra-18-3206-shaft-seal-for-omc-sterndrive-i-o-1972-1986-replaces-omc-907774-except-cobra","title":"Sierra 18-3206 Water Pump Housing - Replaces OMC 907774 - I\/O Stern Drives 1972-86, Except Cobra","description":"\u003cp\u003eThe Sierra 18-3206 is a water pump housing built for I\/O stern drive cooling systems covering the 1972-86 model span, except OMC Cobra units, which use a different housing. The water pump housing is the structural body that seats the impeller and directs raw water flow through the drive's cooling circuit, so a cracked, worn, or corroded housing is a common cause of overheating and reduced water flow on affected stern drives. This housing replaces OEM number 907774 and is sold as a single unit per package.\u003c\/p\u003e\u003cp\u003eBecause fitment on OMC-based stern drives is model-specific, buyers should confirm their drive is not a Cobra unit before ordering the 18-3206 - Cobra applications use a different Sierra part number. Installing the correct housing restores proper impeller seating and water passage geometry for reliable cooling performance.\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 18-3206\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 907774\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e I\/O stern drives, 1972-86, except Cobra models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282113032\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eI\/O stern drives, 1972-86, except Cobra models\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e907774\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3206 water pump housing fit?\u003c\/strong\u003e The Sierra 18-3206 fits I\/O stern drives from 1972-86, except OMC Cobra models, which require a different housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3206 fit an OMC Cobra stern drive?\u003c\/strong\u003e No. The Sierra 18-3206 water pump housing is specifically excluded from Cobra applications; Cobra stern drives use a separate housing part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-3206 replace?\u003c\/strong\u003e It replaces OEM number 907774 on applicable I\/O stern drives, 1972-86, except Cobra models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3206 water pump housing weigh?\u003c\/strong\u003e 0.35 pounds is the weight of the Sierra 18-3206 water pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many water pump housings are included when I order 18-3206?\u003c\/strong\u003e One water pump housing ships per package under Sierra part number 18-3206.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3206 covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3206 water pump housing is backed by Sierra's limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3206 water pump housing?\u003c\/strong\u003e The UPC for the Sierra 18-3206 is 808282113032.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat role does the 18-3206 housing play in the cooling system?\u003c\/strong\u003e As the water pump housing, the 18-3206 holds the impeller and directs raw water through the I\/O stern drive's cooling circuit; a worn or damaged housing can cause overheating or reduced coolant flow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3206 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-3206 is a Sierra-manufactured replacement housing built to meet or exceed the specifications of the original OEM housing it replaces, OEM 907774.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-3206 and a Cobra water pump housing like the 18-4833?\u003c\/strong\u003e The Sierra 18-3206 fits I\/O stern drives from 1972-86 except Cobra, while a part such as 18-4833 is built for OMC Cobra lower units (1986-93) without a cone clutch; these are different SKUs, so confirm which drive you have before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3206 fit any I\/O stern drive built between 1972 and 1986?\u003c\/strong\u003e It fits I\/O stern drives in that 1972-86 range with the exception of OMC Cobra models, which are excluded from this housing's fitment.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988141322459,"sku":"SIE-18-3206","price":33.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3206_lg__18022.1558126416.500.750.jpg?v=1785188755"},{"product_id":"sierra-18-32888-water-pump-base-repair-kit-replaces-mercruiser-46-862914a13-mercruiser-sterndrive","title":"Sierra Water Pump Base Repair Kit 18-32888, Replaces 46-862914A13","description":"\u003cp\u003eThe Sierra Water Pump Base Repair Kit, part number 18-32888, is a plastic water pump base repair kit designed to restore the base of a marine water pump assembly used in boat engine cooling systems. As a water pump base repair kit, it is intended to renew or replace the worn or damaged base housing that supports the impeller and related water pump components, helping restore proper cooling water flow to the engine. The kit is constructed of plastic material and is packaged as a single unit repair kit, making it a straightforward option for owners looking to service their existing water pump assembly rather than replace the entire pump. This part is a vehicle-specific fit for boat applications and is equivalent to OEM part number 46-862914A13, allowing it to serve as a direct replacement in systems that call for that OEM component. At 0.28 pounds, it is a lightweight component sized for the water pump base application it serves.\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 18-32888\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Mercruiser Water Pumps \u0026amp; Impellers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Water Pump Base Repair Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.28 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Service Type:\u003c\/strong\u003e Boat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomotive Fit Type:\u003c\/strong\u003e Vehicle Specific Fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282378875\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis kit is a vehicle-specific fit for boat water pump applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e46-862914A13\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-32888 water pump base repair kit used for?\u003c\/strong\u003e It is used to repair the base of a marine water pump assembly, restoring support for the impeller and related components so engine cooling water flow is maintained.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-32888 equivalent to an OEM part?\u003c\/strong\u003e Yes, Sierra part 18-32888 is equivalent to OEM part number 46-862914A13, so it can be used wherever that OEM number is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-32888 water pump base repair kit made of?\u003c\/strong\u003e The base repair kit is made of plastic.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-32888 kit weigh?\u003c\/strong\u003e The Sierra water pump base repair kit 18-32888 weighs 0.28 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the 18-32888 kit?\u003c\/strong\u003e The kit ships as a single unit count, containing one water pump base repair kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-32888 fit automotive or marine applications?\u003c\/strong\u003e This part is a vehicle-specific fit for boat applications, not automotive use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does the Sierra 18-32888 kit belong to?\u003c\/strong\u003e It is categorized under Mercruiser water pumps and impellers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-32888 water pump base repair kit is a genuine Sierra part, manufactured and sold under the Sierra brand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with part 18-32888?\u003c\/strong\u003e The box includes the water pump base repair kit itself as the sole included component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan 18-32888 replace part number 46-862914A13 directly?\u003c\/strong\u003e Yes, Sierra 18-32888 is listed as the OEM equivalent to 46-862914A13 and can be used as a direct replacement for that number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988142928091,"sku":"SIE-18-32888","price":105.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-32888__43069.1722507095.500.750.jpg?v=1785188988"},{"product_id":"sierra-18-3349-water-pump-housing-kit-for-omc-cobra-sterndrives-2-3-2-5-3-0-4-3-4-6-5-0-5-7-5-8-7-5","title":"Sierra 18-3349 Water Pump Housing Kit for OMC Cobra Drives 2.3, 2.5, 3.0, 4.3, 4.6, 5.0, 5.7, 5.8, 7.5","description":"\u003cp\u003eThe Sierra 18-3349 Water Pump Housing Kit is a replacement water pump housing built for OMC Cobra sterndrive units. This kit supplies the housing component of the raw water cooling system, which circulates water through the drive to keep the engine running at proper operating temperature. The housing is made of rubber, which provides a durable, flexible seal against the mounting surfaces of the drive and helps resist the wear that raw water cooling systems place on pump components over time.\u003c\/p\u003e\u003cp\u003eThis kit is designed to fit all OMC Cobra Drives across a wide engine range, covering 2.3, 2.5, 3.0, 4.3, 4.6, 5.0, 5.7, 5.8, and 7.5 configurations with the specific model years listed below. Boat owners running these OMC Cobra drive setups can use this housing kit as part of a routine water pump service or when replacing a worn or damaged housing. Installing a proper-fitting housing is an important step in keeping the cooling system sealed and functioning correctly, which protects the engine from overheating.\u003c\/p\u003e\u003cp\u003eThe kit weighs 0.61 pounds and ships as a single unit under UPC 808282180423.\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 18-3349\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Housing Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.61 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282180423\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e All OMC Cobra Drives - 2.3 (1987-90), 2.5 (1986), 3.0 (1986-93), 4.3 (1986-93), 4.6 (1989), 5.0 (1986-93), 5.7 (1986-93), 5.8 (1989-93), 7.5 (1987-89)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAll OMC Cobra Drives, 2.3 engine, 1987-90\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 2.5 engine, 1986\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 3.0 engine, 1986-93\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 4.3 engine, 1986-93\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 4.6 engine, 1989\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 5.0 engine, 1986-93\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 5.7 engine, 1986-93\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 5.8 engine, 1989-93\u003c\/li\u003e\n\u003cli\u003eAll OMC Cobra Drives, 7.5 engine, 1987-89\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3349 Water Pump Housing Kit used for?\u003c\/strong\u003e It is a replacement water pump housing kit for OMC Cobra sterndrives, used to service or replace the housing component of the drive's raw water cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OMC Cobra drive engines does part number 18-3349 fit?\u003c\/strong\u003e This housing kit fits all OMC Cobra Drives, covering the 2.3 (1987-90), 2.5 (1986), 3.0 (1986-93), 4.3 (1986-93), 4.6 (1989), 5.0 (1986-93), 5.7 (1986-93), 5.8 (1989-93), and 7.5 (1987-89) engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3349 kit fit the 5.0 liter OMC Cobra drive?\u003c\/strong\u003e Yes, the Sierra 18-3349 Water Pump Housing Kit fits the 5.0 engine on OMC Cobra Drives for the 1986-93 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3349 kit fit the 7.5 liter OMC Cobra drive?\u003c\/strong\u003e Yes, this housing kit fits the 7.5 engine on OMC Cobra Drives for the 1987-89 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-3349 water pump housing made of?\u003c\/strong\u003e The housing in kit 18-3349 is made of rubber.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3349 Water Pump Housing Kit weigh?\u003c\/strong\u003e It weighs 0.61 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many housing units come in the 18-3349 kit?\u003c\/strong\u003e The Sierra 18-3349 Water Pump Housing Kit includes one water pump housing unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3349 Water Pump Housing Kit?\u003c\/strong\u003e The UPC for this kit is 808282180423.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3349 housing kit an OEM or aftermarket part?\u003c\/strong\u003e The 18-3349 Water Pump Housing Kit is a Sierra-branded replacement part sold under the Sierra 18-3349 part number for OMC Cobra Drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the water pump housing on an OMC Cobra drive be replaced?\u003c\/strong\u003e The housing should be replaced when it is worn, cracked, or no longer sealing properly during routine water pump service, using a matching part such as the Sierra 18-3349 kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3349 kit fit the 2.3 liter OMC Cobra drive?\u003c\/strong\u003e Yes, the Sierra 18-3349 Water Pump Housing Kit fits the 2.3 engine on OMC Cobra Drives for the 1987-90 model years.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988144697563,"sku":"SIE-18-3349","price":48.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3349_lg__39771.1558125677.500.750.jpg?v=1785188284"},{"product_id":"sierra-18-3417-water-pump-base-for-mercruiser-replaces-46-57234a1-fits-mc-i-r-drives-without-flush-screw-in-housing-1970-1984","title":"Sierra Water Pump Base 18-3417, Replaces Mercruiser 46-57234A1, Fits MC-I \u0026 R Drives 1970-1984","description":"\u003cp\u003eThe Sierra 18-3417 Water Pump Base is a precision machined replacement base for the water pump assembly on MerCruiser MC-I \u0026amp; R stern drives without a flush screw in the gear housing. It is built to the same fit, form, and function as the original equipment part it replaces and is intended as a direct install for units within the applicable serial number range, restoring proper water pump seating and cooling system integrity on affected drives.\u003c\/p\u003e\u003cp\u003eThis is a compact, machined component measuring 0.39 x 0.39 x 0.39 inches and weighing 0.22 pounds. It is cross-referenced to GLM 12310, Mallory 9-43306, and Mercruiser 46-57234A1, so buyers who know any of these numbers can confirm they are ordering the correct part. Every Sierra part is backed by Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003eImportant fitment note: units that have been retro-fitted with an Alpha style lower unit (no pre-load pin in the top of the driveshaft) must use Alpha style parts instead, part numbers 18-3320 or 18-3420, rather than the 18-3417.\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 18-3417\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315908\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e MC-I \u0026amp; R drives without flush screw in gear housing (1970-1984)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Number Range:\u003c\/strong\u003e 2763442 - 6854392\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 12310, Mallory 9-43306, Mercruiser 46-57234A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eMC-I \u0026amp; R drives without a flush screw in the gear housing (1970-1984), serial numbers 2763442 through 6854392. Units retro-fitted with an Alpha style lower unit (no pre-load pin in top of driveshaft) require Alpha style parts 18-3320 or 18-3420 instead.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 12310\u003c\/li\u003e\n\u003cli\u003eMallory 9-43306\u003c\/li\u003e\n\u003cli\u003eMercruiser 46-57234A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3417 Water Pump Base fit?\u003c\/strong\u003e The 18-3417 fits MerCruiser MC-I \u0026amp; R drives that do not have a flush screw in the gear housing, covering units in the serial number range 2763442 through 6854392 (1970-1984).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3417 interchangeable with the Mercruiser OEM part?\u003c\/strong\u003e Yes, the 18-3417 is directly interchangeable with Mercruiser OEM number 46-57234A1, as well as GLM 12310 and Mallory 9-43306.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this water pump base weigh?\u003c\/strong\u003e The Sierra 18-3417 Water Pump Base weighs 0.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of part number 18-3417?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches, a compact machined component that sits within the water pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3417 fit a drive that has a flush screw in the gear housing?\u003c\/strong\u003e No. The 18-3417 is designed specifically for units without a flush screw in the gear housing; units with a flush screw use a different Sierra part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMy drive has been retro-fitted with an Alpha style lower unit, can I still use the 18-3417?\u003c\/strong\u003e No. Units retro-fitted with an Alpha style lower unit (no pre-load pin in the top of the driveshaft) must use Alpha style parts instead, Sierra part 18-3320 or 18-3420, not the 18-3417.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the finish on the 18-3417 Water Pump Base?\u003c\/strong\u003e The Sierra 18-3417 has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3417 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3417 Water Pump Base is covered under Sierra's customer satisfaction warranty like all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my serial number matches this part?\u003c\/strong\u003e The 18-3417 is designated for units without a flush screw in the gear housing falling within serial numbers 2763442 to 6854392; check your drive's serial number tag against this range before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3417 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-3417 is a Sierra aftermarket water pump base engineered to meet or exceed the original equipment part it replaces, Mercruiser 46-57234A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat years does the 18-3417 Water Pump Base cover?\u003c\/strong\u003e This water pump base is designated for MC-I \u0026amp; R drives without a flush screw in the gear housing from 1970-1984.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988147974363,"sku":"SIE-18-3417","price":29.92,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3417_lg__62852.1558125879.500.750.jpg?v=1785189212"},{"product_id":"sierra-18-3414-water-pump-base-for-mercury-mariner-outboards-replaces-oem-46-96146a5","title":"Sierra 18-3414 Water Pump Base for Mercury\/Mariner Outboard Motors - Replaces 46-77516A1","description":"\u003cp\u003eThe Sierra 18-3414 is a water pump base built for Mercury\/Mariner outboard motors, designed to meet or exceed original equipment quality. The water pump base is a core structural component of the outboard's cooling system, forming the housing that the impeller and related water pump components mount into and seal against. A properly fitted water pump base ensures the impeller can maintain the seal and pressure needed to draw raw water through the powerhead cooling passages, so replacing a cracked, worn, or corroded base restores reliable water flow and helps protect the engine from overheating.\u003c\/p\u003e\u003cp\u003eSierra manufactures this base as a direct cross-reference to several Mercury OEM part numbers, making it straightforward to identify as the correct replacement when servicing Mercury\/Mariner outboards that originally used any of those OEM numbers. At 0.21 pounds, it is a compact, precision-made component intended to be installed alongside the impeller and related water pump hardware during a cooling system service or 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 18-3414\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315885\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury\/Mariner outboard motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, 46-48745A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner outboard motor\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e46-77516A1\u003c\/li\u003e\n\u003cli\u003e46-73842A2\u003c\/li\u003e\n\u003cli\u003e46-68390A1\u003c\/li\u003e\n\u003cli\u003e46-65498A1\u003c\/li\u003e\n\u003cli\u003e46-48745A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3414 water pump base used for?\u003c\/strong\u003e It is the water pump base for Mercury\/Mariner outboard motor cooling systems, the housing component that the impeller and water pump assembly mount into to draw and seal raw water for engine cooling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Mercury outboard motors does part 18-3414 fit?\u003c\/strong\u003e The Sierra 18-3414 water pump base is built for Mercury\/Mariner outboard motors that use any of its cross-referenced Mercury OEM part numbers: 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, or 46-48745A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3414 the same as Mercury 46-77516A1?\u003c\/strong\u003e Yes, the Sierra 18-3414 water pump base cross-references directly to Mercury OEM part numbers 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, and 46-48745A1, so it is an equivalent replacement for any of those numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3414 water pump base weigh?\u003c\/strong\u003e The Sierra 18-3414 water pump base weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3414 come with the impeller included?\u003c\/strong\u003e No, the Sierra 18-3414 is the water pump base only; the impeller and drain gasket are separate components sold under their own part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-3414 replace?\u003c\/strong\u003e It replaces Mercury OEM numbers 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, and 46-48745A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3414 an aftermarket or genuine Mercury part?\u003c\/strong\u003e The Sierra 18-3414 is an aftermarket water pump base manufactured to meet or exceed original equipment quality, offered as a cross-reference replacement for the listed Mercury OEM part numbers rather than a Mercury-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-3414 is the correct water pump base for my outboard?\u003c\/strong\u003e Check the OEM number stamped on your existing water pump base against the cross-reference list for Sierra 18-3414 (46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, 46-48745A1); a match confirms fit is specific to those numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-3414 water pump base?\u003c\/strong\u003e The UPC for the Sierra 18-3414 water pump base is 030999315885.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace a water pump base on my outboard motor?\u003c\/strong\u003e A cracked, worn, or corroded water pump base can prevent the impeller from sealing properly, reducing raw water flow to the cooling system; replacing it with the Sierra 18-3414 restores the sealing surface needed for reliable cooling.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148170971,"sku":"SIE-18-3414","price":41.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3414_lg__69173.1558125764.500.750.jpg?v=1785188970"},{"product_id":"sierra-18-3419-water-pump-base-for-mercury-mariner-outboards-replaces-oem-46-42579a3","title":"Sierra 18-3419 Water Pump Base for Mercury\/Mariner Outboard Motors, Replaces Mercury 46-42579A3","description":"\u003cp\u003eThe Sierra 18-3419 Water Pump Base is a replacement component for the water pump housing assembly on Mercury and Mariner outboard motors. Built from aluminum, this base is designed to meet or exceed original equipment quality, giving boaters a durable, direct-fit foundation for the water pump impeller assembly that keeps the outboard's cooling system operating correctly. The water pump base is a wear item in the outboard's raw-water cooling circuit, and replacing it along with the impeller and related wear components during routine water pump service helps ensure consistent water flow to the engine.\u003c\/p\u003e\u003cp\u003eThis part is fit specific, so buyers should confirm the part number against their existing water pump base before ordering to ensure proper fit. The Sierra 18-3419 is manufactured to be interchangeable with the corresponding Mercury Marine OEM water pump base, making it a straightforward replacement option for outboard owners performing their own water pump maintenance.\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 18-3419\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFor Mercury and Mariner outboard motors. Fit specific; check part numbers against your existing water pump base to ensure proper fit.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 12360\u003c\/li\u003e\n\u003cli\u003eMallory 9-43307\u003c\/li\u003e\n\u003cli\u003eMercury 46-42579A3\u003c\/li\u003e\n\u003cli\u003e46-8M0077147\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3419 Water Pump Base used for?\u003c\/strong\u003e It is the water pump base component of the water pump housing assembly on Mercury and Mariner outboard motors, providing the mounting foundation for the impeller assembly in the engine's raw-water cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-3419 fit my Mercury outboard?\u003c\/strong\u003e The Sierra 18-3419 is designed for Mercury and Mariner outboard motors, but it is fit specific, so you should check part numbers against your existing water pump base before ordering to confirm proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3419 the same as Mercury part 46-42579A3?\u003c\/strong\u003e Yes, the Sierra 18-3419 Water Pump Base is interchangeable with Mercury Marine OEM part number 46-42579A3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other part numbers cross-reference to the Sierra 18-3419?\u003c\/strong\u003e The Sierra 18-3419 is interchangeable with GLM 12360, Mallory 9-43307, Mercury 46-42579A3, and 46-8M0077147.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-3419 Water Pump Base made from?\u003c\/strong\u003e This water pump base is made from aluminum.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3419 Water Pump Base weigh?\u003c\/strong\u003e The Sierra 18-3419 weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3419 a genuine Mercury part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-3419 is an aftermarket water pump base manufactured by Sierra to meet or exceed original equipment quality, built to be interchangeable with the equivalent Mercury Marine OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3419 come with the impeller included?\u003c\/strong\u003e No, the Sierra 18-3419 is the water pump base only; it does not include the impeller or other water pump kit components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the water pump base be replaced on an outboard?\u003c\/strong\u003e The water pump base is typically inspected and replaced during routine water pump service along with the impeller and other wear components to maintain proper cooling system performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy is fit verification important before ordering the Sierra 18-3419?\u003c\/strong\u003e Because water pump bases are fit specific across different Mercury and Mariner outboard models, confirming the part number against your existing base before ordering the Sierra 18-3419 helps ensure you receive a properly fitting replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148269275,"sku":"SIE-18-3419","price":24.66,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3419_lg__54457.1558125960.500.750.jpg?v=1785188116"},{"product_id":"sierra-18-3420-water-pump-base-for-mercruiser-alpha-one-mr-sterndrives-1985-1990-replaces-mercury-46-44292a3","title":"Sierra Water Pump Base 18-3420 for MerCruiser MR \u0026 Alpha One Drives (1985-1990), Replaces Mercury Marine 46-44292A3","description":"\u003cp\u003eThe Sierra 18-3420 Water Pump Base is an aluminum housing component for the raw water pump on MerCruiser MR and Alpha One stern drives (1985-1990). The water pump base serves as the mounting structure for the pump impeller assembly, directing raw water into the cooling circuit that keeps the engine and drive running at safe operating temperatures. Because it sits directly in the raw water flow path, the base is subject to corrosion and wear over time, and a compromised base can lead to reduced water flow, overheating, or impeller seal leaks -- making this a common maintenance and repair item for boaters servicing their MerCruiser cooling system.\u003c\/p\u003e\u003cp\u003eThis water pump base is built from aluminum for durability in a marine raw-water environment and is engineered as a fit-for-fit equivalent to Mercury Marine 46-44292A3. It is intended for MR and Alpha One drive owners performing a water pump rebuild or replacing a cracked, corroded, or worn original base as part of routine cooling system maintenance.\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 18-3420\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e MerCruiser MR \u0026amp; Alpha One drives (1985-1990)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315922\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser MR \u0026amp; Alpha One drives (1985-1990)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 46-44292A3\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3420 water pump base fit?\u003c\/strong\u003e The Sierra 18-3420 is designed for MerCruiser MR and Alpha One stern drives from 1985 to 1990.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3420 the same as Mercury Marine 46-44292A3?\u003c\/strong\u003e Yes, the 18-3420 is a direct equivalent to Mercury Marine part number 46-44292A3 and is built to match its fit and function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the water pump base made from?\u003c\/strong\u003e This water pump base, Sierra 18-3420, is made from aluminum.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3420 water pump base weigh?\u003c\/strong\u003e The Sierra 18-3420 water pump base weighs 0.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat role does the water pump base play in the cooling system?\u003c\/strong\u003e It is the housing that mounts the water pump impeller assembly on MerCruiser MR and Alpha One drives, directing raw water into the engine cooling circuit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace my water pump base?\u003c\/strong\u003e A cracked, corroded, or worn water pump base like the Sierra 18-3420 should be replaced if it is causing reduced water flow, leaks, or overheating in the raw water cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Mercury Marine part or an aftermarket part?\u003c\/strong\u003e The Sierra 18-3420 is an aftermarket water pump base manufactured by Sierra as an equivalent to Mercury Marine 46-44292A3, not an original Mercury Marine branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3420 come with the impeller included?\u003c\/strong\u003e No, the Sierra 18-3420 is the water pump base housing only; it does not include the impeller.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3420 fit later MerCruiser Alpha One Generation II drives?\u003c\/strong\u003e The Sierra 18-3420 is specified for MR and Alpha One drives from 1985 to 1990; it is not listed for Alpha One Generation II applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color or finish does the water pump base have?\u003c\/strong\u003e The Sierra 18-3420 water pump base has a natural aluminum finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3420 covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3420 water pump base is covered under Sierra's standard limited warranty against manufacturing defects.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148400347,"sku":"SIE-18-3420","price":30.12,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3420_lg__02303.1558126021.500.750.jpg?v=1785188108"},{"product_id":"complete-water-pump-seal-kit-for-mercruiser-alpha-one-mr-sterndrive-replaces-18-3320-oem-817275a1-cooling-system-repair-kit-26-01800-b","title":"Engineered Marine Products Complete Water Pump and Seal Kit 26-01800-B for Mercury Outboard Cooling Systems","description":"\u003cp\u003eThe Engineered Marine Products Complete Water Pump and Seal Kit, part number 26-01800-B, is a cooling system rebuild kit designed for Mercury outboard engines. It provides the components needed to restore proper raw-water circulation through the engine's cooling system, which is essential for preventing overheating and protecting the powerhead. The kit is built to OEM standards, giving installers a direct, reliable replacement solution rather than a partial or mismatched assortment of parts.\u003c\/p\u003e\u003cp\u003eEngineered Marine Products has supplied both OEM and aftermarket marine channels for over 40 years, engineering and sourcing components that meet original equipment quality expectations at a competitive price point. This water pump and seal kit carries a machined exterior finish and ships as a compact, complete package measuring 4 x 4 x 4 inches and weighing 1.112 pounds, making it easy to store and handle during a routine cooling system service.\u003c\/p\u003e\u003cp\u003eThis kit is intended for technicians and boat owners performing a water pump rebuild or seasonal cooling system maintenance on compatible Mercury outboard applications. Installing a complete kit at one time, rather than replacing individual worn components separately, helps ensure all wear parts are renewed together and reduces the chance of a follow-up failure from an overlooked seal or gasket.\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 26-01800-B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 840080416946\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 4 x 4 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.112 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Water Pump and Seal Kit, Cooling System\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Engineered Marine Products kit 26-01800-B?\u003c\/strong\u003e Part number 26-01800-B is a complete water pump and seal kit, packaged as a full set of cooling system components rather than a single piece, for a Mercury outboard water pump rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does this water pump and seal kit fit?\u003c\/strong\u003e The 26-01800-B kit is categorized for Mercury outboard water pump applications; consult your engine's model and serial number to confirm compatibility before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 26-01800-B water pump kit weigh?\u003c\/strong\u003e This kit weighs 1.112 pounds as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the water pump and seal kit box?\u003c\/strong\u003e The Engineered Marine Products 26-01800-B kit measures 4 x 4 x 4 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an OEM or aftermarket water pump kit?\u003c\/strong\u003e The 26-01800-B kit is an aftermarket kit manufactured by Engineered Marine Products and built to OEM standards for Mercury outboard cooling systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the housing have?\u003c\/strong\u003e Components in the 26-01800-B kit have a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace the whole kit instead of just the impeller?\u003c\/strong\u003e Replacing the full 26-01800-B water pump and seal kit at once renews all of the wear components together, which reduces the risk of a related seal or gasket failing soon after a partial repair.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I find the manufacturer part number on this kit?\u003c\/strong\u003e The manufacturer part number, 26-01800-B, identifies this specific Engineered Marine Products water pump and seal kit and can be used to confirm you are ordering the correct kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho makes this water pump and seal kit?\u003c\/strong\u003e This kit is made by Engineered Marine Products, a manufacturer that has supplied OEM and aftermarket marine cooling system parts for over 40 years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with part number 26-01800-B?\u003c\/strong\u003e The UPC for the Engineered Marine Products 26-01800-B water pump and seal kit is 840080416946.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991283806427,"sku":"EMP-26-01800-B","price":60.79,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP_26-01800-B_Mercury_MerCruiser_Water_Pump_Kit__87045.1722508034.500.750.jpg?v=1785189084"},{"product_id":"water-pump-kit-with-base-for-mercury-outboards-replaces-oem-46-42579a4-mpn-46-13171","title":"EMP Water Pump Kit with Base for Mercury Outboard, Replaces Mercury Marine 46-42579A4","description":"\u003cp\u003eThis EMP Water Pump Kit with Base is a complete water pump replacement kit for Mercury outboard motors, designed to restore proper cooling system function. The kit includes the water pump base along with the components needed to replace a worn or failing pump assembly, helping prevent overheating caused by reduced water flow through the cooling system. It is built as a direct equivalent to Mercury Marine 46-42579A4, so it installs in place of that OEM part without modification. Marine mechanics and boat owners performing routine maintenance or addressing an overheating outboard can use this kit to replace the water pump housing and base together rather than sourcing separate components. Because water pump wear is a common maintenance item on outboard motors, keeping a cross-referenced replacement kit on hand simplifies servicing and reduces downtime. This kit is cataloged under EMP part number 46-13171 for easy reordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e EMP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 46-13171\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Kit with Base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Mercury Outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 840080496603\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.891 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eMercury Outboard\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 46-42579A4\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the EMP 46-13171 water pump kit include?\u003c\/strong\u003e The EMP 46-13171 kit is a water pump kit with base, providing the pump housing and base needed to replace a Mercury outboard water pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs EMP 46-13171 the same as Mercury Marine 46-42579A4?\u003c\/strong\u003e Yes, EMP 46-13171 is a direct replacement for Mercury Marine 46-42579A4 and installs in its place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat outboard motors does this water pump kit fit?\u003c\/strong\u003e This water pump kit with base, EMP part number 46-13171, is designed to fit Mercury outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the EMP 46-13171 water pump kit weigh?\u003c\/strong\u003e The EMP 46-13171 water pump kit with base weighs 0.891 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit come with a base plate?\u003c\/strong\u003e Yes, the EMP 46-13171 kit is a water pump kit with base, so the base plate is included along with the pump housing components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs EMP 46-13171 an OEM Mercury Marine part or aftermarket?\u003c\/strong\u003e EMP 46-13171 is an aftermarket water pump kit manufactured to replace Mercury Marine 46-42579A4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the EMP 46-13171 water pump kit?\u003c\/strong\u003e The EMP 46-13171 water pump kit with base carries UPC 840080496603.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace my outboard's water pump kit?\u003c\/strong\u003e A worn water pump reduces cooling water flow to an outboard motor, and replacing it with a kit like the EMP 46-13171 helps restore proper engine cooling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use EMP 46-13171 to replace just the impeller, or is it a full pump kit?\u003c\/strong\u003e EMP 46-13171 is a full water pump kit with base rather than an impeller-only part, covering the pump housing and base assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is EMP 46-13171 listed under?\u003c\/strong\u003e EMP 46-13171 is categorized as a Mercury outboard water pump and impeller component, specifically a water pump kit with base.\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":48991289573595,"sku":"EMP-46-13171","price":49.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/EMP-46-13171-Merucry-Mariner-Water-pump-kit-with-base__18444.1722512570.500.750.jpg?v=1785329113"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/collections\/EMP-46-13171-Merucry-Mariner-Water-pump-kit-with-base__18444.1722512570.500.750.jpg?v=1785356525","url":"https:\/\/www.goodvibesmarina.com\/collections\/gvcat-propellers-drive-lower-unit-lower-unit-gearcase-water-pump-housings-base-kits.oembed","provider":"Good Vibes Marina","version":"1.0","type":"link"}