{"product_id":"sierra-18-3434-water-pump-kit-without-housing-for-yamaha-40-60-hp-outboards-replaces-63d-w0078-01-00","title":"Sierra 18-3434 Water Pump Kit for Yamaha Outboard, Replaces 63D-W0078-01-00, Without Housing","description":"\u003cp\u003eThe Sierra 18-3434 is a water pump repair kit built for Yamaha outboard motors, supplying the core wear components needed to restore cooling system pressure and flow without replacing the entire pump housing. This kit is sold without the housing itself, so it is intended for rebuilding an existing pump body rather than a full pump replacement -- Sierra offers the same kit with the housing included under part number 18-3145 for buyers who need that additional piece.\u003c\/p\u003e\u003cp\u003eInside the kit you get the impeller, the pump case gasket, and the wear plate, the three parts that wear out fastest in a water pump and are the most common cause of overheating or reduced water flow. The impeller is the flexible-vane component that actually pumps raw water through the cooling passages, the wear plate provides a smooth, flat surface for the impeller vanes to seal against, and the gasket seals the pump case to prevent leaks and pressure loss. Replacing all three together, rather than piecemeal, is the standard approach for a proper pump rebuild since they wear as a set.\u003c\/p\u003e\u003cp\u003eThe 18-3434 is designed as a direct equivalent to Yamaha OEM part 63D-W0078-01-00 and is cross-referenced to 63D-44311-00-00 as well, so it drops into applications calling for either Yamaha number. It fits a range of Yamaha outboard models as detailed 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 18-3434\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Repair Kit (Without Housing)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Includes:\u003c\/strong\u003e Impeller, Pump Case Gasket, Wear Plate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpeller OEM Number:\u003c\/strong\u003e 697-44352-00-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Case Gasket OEM Number:\u003c\/strong\u003e 63D-44316-00-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear Plate OEM Number:\u003c\/strong\u003e 63D-44323-00-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 63D-W0078-01-00, 63D-44311-00-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Engine Brand:\u003c\/strong\u003e Yamaha Outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Kit (With Housing):\u003c\/strong\u003e Sierra 18-3145\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha 40\/50 hp (1995-03)\u003c\/li\u003e\n\u003cli\u003eYamaha P40 (1998)\u003c\/li\u003e\n\u003cli\u003eYamaha C40 3 cyl (1997-02)\u003c\/li\u003e\n\u003cli\u003eYamaha C50 (1999-01)\u003c\/li\u003e\n\u003cli\u003eYamaha F40 2.6L (1999)\u003c\/li\u003e\n\u003cli\u003eYamaha F50 (1995-03)\u003c\/li\u003e\n\u003cli\u003eYamaha P50 (1995-96)\u003c\/li\u003e\n\u003cli\u003eYamaha F60 (2002-03)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e63D-W0078-01-00\u003c\/li\u003e\n\u003cli\u003e63D-44311-00-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3434 water pump kit include?\u003c\/strong\u003e The kit includes an impeller, a pump case gasket, and a wear plate, the three components most commonly replaced during a Yamaha outboard water pump rebuild. It does not include the pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3434 come with the pump housing?\u003c\/strong\u003e No, this kit is sold without the housing. Sierra part number 18-3145 is the same kit but with the housing included, for buyers who need to replace that part as well.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Yamaha outboards does the Sierra 18-3434 fit?\u003c\/strong\u003e It fits Yamaha 40\/50 hp (1995-03), P40 (1998), C40 3 cyl (1997-02), C50 (1999-01), F40 2.6L (1999), F50 (1995-03), P50 (1995-96), and F60 (2002-03).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM Yamaha part numbers does 18-3434 replace?\u003c\/strong\u003e It replaces Yamaha OEM numbers 63D-W0078-01-00 and 63D-44311-00-00, so it is a direct fit anywhere either of those numbers is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the impeller in this kit a separate part number?\u003c\/strong\u003e Yes, the impeller included in the 18-3434 kit corresponds to Yamaha OEM number 697-44352-00-00 and is supplied as part of the full kit rather than sold separately in this listing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3434 water pump kit weigh?\u003c\/strong\u003e It weighs 0.35 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the wear plate included, and what OEM number does it match?\u003c\/strong\u003e Yes, a wear plate is included in the 18-3434 kit and matches Yamaha OEM number 63D-44323-00-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the gasket OEM number in this kit?\u003c\/strong\u003e The pump case gasket included with the Sierra 18-3434 matches Yamaha OEM number 63D-44316-00-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3434 a genuine Yamaha part or aftermarket?\u003c\/strong\u003e The 18-3434 is a Sierra-manufactured kit designed as a direct equivalent to Yamaha OEM numbers 63D-W0078-01-00 and 63D-44311-00-00, not a genuine Yamaha-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need 18-3145 instead of 18-3434?\u003c\/strong\u003e Choose 18-3145 if your pump housing itself is damaged and needs replacing; 18-3434 is the same rebuild kit but without the housing, for when the housing is still serviceable.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit fit both 2-stroke and 4-stroke Yamaha models?\u003c\/strong\u003e The 18-3434 fitment spans models like the 40\/50 hp, C40, C50, P40, P50, F40 2.6L, and F60, covering the specific Yamaha model years listed rather than a single engine type.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988149088475,"sku":"SIE-18-3434","price":35.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3434__89322.1739458751.500.750.jpg?v=1785188757","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3434-water-pump-kit-without-housing-for-yamaha-40-60-hp-outboards-replaces-63d-w0078-01-00","provider":"Good Vibes Marina","version":"1.0","type":"link"}