{"product_id":"sierra-18-3237-water-pump-impeller-repair-kit-for-mercruiser-bravo-i-ii-iii-sterndrives-1988-up-replaces-46-807151a12","title":"Sierra Water Pump Impeller Repair Kit 18-3237 for MerCruiser Bravo I, II, III (1988 \u0026 Up)","description":"\u003cp\u003eThe Sierra 18-3237 Impeller Repair Kit rebuilds the raw water pump on MerCruiser Bravo I, II, and III drives with a one-piece pump housing, built from serial number B664190 and up. It restores full cooling capacity to a worn or leaking pump by replacing the wear items that fail first: the impeller, the wear plate, and the sealing O-ring. Rather than replacing the entire water pump assembly, this kit lets you rebuild the existing housing at a fraction of the cost, restoring proper raw water flow to the engine's cooling system and preventing overheating caused by a cracked, glazed, or worn-down impeller.\u003c\/p\u003e\u003cp\u003eEach kit contains a Sierra 18-3087 impeller, a Sierra 18-3350 wear plate, and a Sierra 18-7163 O-ring, giving you every wear component needed for a complete pump rebuild in a single package. The kit is built from aluminum and cast iron components to match OEM fit and durability, and is designed as a direct fit for Bravo drives with the one-piece pump housing. Because MerCruiser Bravo drives rely on a properly functioning water pump to circulate raw water through the engine, keeping this kit on hand or installing it at recommended service intervals helps prevent costly overheating damage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3237\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Impeller Repair Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum, Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.59 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e 18-3087 Impeller, 18-3350 Wear Plate, 18-7163 O-Ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282105532\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser Bravo I, II, III (1988 \u0026amp; up), Serial #B664190 \u0026amp; up\u003c\/li\u003e\n\u003cli\u003eFits Bravo drives with a one-piece pump housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 12084\u003c\/li\u003e\n\u003cli\u003eMallory 9-48316\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3237 kit include?\u003c\/strong\u003e The kit contains a Sierra 18-3087 impeller, a Sierra 18-3350 wear plate, and a Sierra 18-7163 O-ring, which are the three wear components needed to rebuild the raw water pump on a compatible Bravo drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich drives does part number 18-3237 fit?\u003c\/strong\u003e This kit fits MerCruiser Bravo I, II, and III drives built 1988 and up, from serial number B664190 and up, specifically drives with a one-piece pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-3237 a full water pump or a repair kit?\u003c\/strong\u003e It is a repair kit, not a complete water pump assembly. It supplies the impeller, wear plate, and O-ring used to rebuild an existing one-piece Bravo pump housing rather than replace the whole pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit work on a Bravo drive with a two-piece pump housing?\u003c\/strong\u003e No. The Sierra 18-3237 kit is designed specifically for Bravo drives with a one-piece pump housing; a two-piece housing requires a different kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the OEM equivalent of the 18-3237 kit?\u003c\/strong\u003e The Sierra 18-3237 kit is interchangeable with GLM 12084 and Mallory 9-48316, so any of those part numbers should get you the correct kit for a one-piece Bravo pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3237 kit weigh?\u003c\/strong\u003e The Sierra 18-3237 Impeller Repair Kit weighs 0.59 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the impeller in this kit made from?\u003c\/strong\u003e The components in the Sierra 18-3237 kit, including the housing-facing wear plate, are made from aluminum and cast iron to match OEM specifications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my Bravo drive's water pump needs this kit?\u003c\/strong\u003e Signs include engine overheating, reduced raw water flow at the tell-tale, or a cracked and glazed impeller when the pump housing is opened for inspection; the 18-3237 kit addresses all three wear items in one purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3237 kit genuine Sierra or aftermarket?\u003c\/strong\u003e It is a genuine Sierra part, sold under Sierra part number 18-3237, and is covered by Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-3237 kit myself?\u003c\/strong\u003e Yes, the kit is designed as a drop-in rebuild for the existing one-piece Bravo pump housing, replacing the impeller, wear plate, and O-ring without needing a different pump assembly.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988141945051,"sku":"SIE-18-3237","price":44.12,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3237__09537.1558184833.500.750.jpg?v=1785188642","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3237-water-pump-impeller-repair-kit-for-mercruiser-bravo-i-ii-iii-sterndrives-1988-up-replaces-46-807151a12","provider":"Good Vibes Marina","version":"1.0","type":"link"}