{"product_id":"water-pump-kit-for-yamaha-outboard-replaces-6l2-w0078-00-00-without-housing-sierra-18-3431-impeller-bolts","title":"Sierra Water Pump Kit 18-3431, Replaces Yamaha 6L2-W0078-00-00, Without Housing","description":"\u003cp\u003eThe Sierra 18-3431 Water Pump Kit is a complete rebuild kit for Yamaha outboard cooling systems, designed to replace a worn or failing water pump assembly without needing a new housing. This kit is built for outboard, inboard, and sterndrive engines that use this pump configuration, giving boat owners a direct path to restoring proper cooling flow and preventing overheating damage to the powerhead.\u003c\/p\u003e\u003cp\u003eEach kit includes the core wear components that typically fail first in a marine water pump: the impeller, the cup\/insert, and the mounting bolts. The impeller compound is formulated by Sierra based on the size and application of this specific pump, so it is matched to the demands of the Yamaha outboard cooling system rather than a generic rubber blend. All other components in the kit are manufactured to meet or exceed original equipment specifications, so fit and performance align with the original design intent.\u003c\/p\u003e\u003cp\u003eBecause this kit is supplied without a housing, it is intended for engines where the existing pump housing is still serviceable and only the internal wear parts need replacement. The kit is assembled and quality-checked at Sierra's Illinois factory and is backed by Sierra's 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 18-3431\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Pump Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Without Housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.44 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999975782\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e NSS Cup\/Insert, Impeller (Sierra 18-3065), Bolts (4)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha outboard engines using the 6L2-W0078-00-00 water pump assembly\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e6L2-W0078-00-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3431 Water Pump Kit include?\u003c\/strong\u003e The kit contains an NSS cup\/insert, an impeller (Sierra part 18-3065), and four mounting bolts, giving you the internal wear components needed to rebuild the water pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit come with a pump housing?\u003c\/strong\u003e No, the Sierra 18-3431 is supplied without a housing, so it is intended for use with an existing, still-serviceable pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Yamaha part number does the 18-3431 replace?\u003c\/strong\u003e It replaces Yamaha OEM number 6L2-W0078-00-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the water pump kit weigh?\u003c\/strong\u003e 0.44 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the impeller in this kit sized specifically for this pump?\u003c\/strong\u003e Yes, the impeller compound in the Sierra 18-3431 kit is formulated based on the specific size and application of this pump rather than being a generic universal impeller.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engine types is the Sierra 18-3431 designed for?\u003c\/strong\u003e This water pump kit is offered for outboard, inboard, or sterndrive applications, specifically for Yamaha outboard engines that use the 6L2-W0078-00-00 pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-3431 kit made?\u003c\/strong\u003e Sierra assembles this water pump kit at its factory in Illinois.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3431 backed by a warranty?\u003c\/strong\u003e Yes, it is backed by Sierra's warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bolts come in the kit?\u003c\/strong\u003e Four bolts are included in the Sierra 18-3431 Water Pump Kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this water pump kit?\u003c\/strong\u003e 030999975782 is the UPC for the Sierra 18-3431 Water Pump Kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the replacement impeller made to OEM specifications?\u003c\/strong\u003e The impeller and other components in the 18-3431 kit are constructed to meet or exceed original manufacturer specifications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148465883,"sku":"SIE-18-3431","price":31.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3431_lg__51692.1558126773.500.750.jpg?v=1785188485","url":"https:\/\/www.goodvibesmarina.com\/products\/water-pump-kit-for-yamaha-outboard-replaces-6l2-w0078-00-00-without-housing-sierra-18-3431-impeller-bolts","provider":"Good Vibes Marina","version":"1.0","type":"link"}