{"product_id":"water-pump-repair-kit-fits-yamaha-6-15-hp-replaces-63v-44301-00-63v-w0078-00","title":"Water Pump Repair Kit – Fits Yamaha 6–15 HP (Replaces 63V-44301-00, 63V-W0078-00)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Repair Kit – Fits Yamaha 6–15 HP (Replaces 63V-44301-00, 63V-W0078-00)\u003c\/strong\u003e provides all essential components to restore your engine’s cooling system. It is designed for Yamaha 4-Stroke engines including 6 HP, 8 HP, 9.9 HP, 13.5 HP, and 15 HP models (1998–2008), as well as 2-Stroke 9.9 HP and 15 HP models (1998–2008).\u003c\/p\u003e\n\u003cp\u003eThis kit serves as a direct replacement for Yamaha part numbers in the 63V-W0078-00 through 63V-W0078-04 series, and interchanges with Sierra 18-3356\/18-3412, HJ YHJB-63V, Mallory 9-43254, and Parsun PAF15-06060001.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls in the lower unit gearcase to restore water circulation.\u003c\/li\u003e\n  \u003cli\u003eIncludes the impeller, cartridge, plate, seals, and hardware for a complete overhaul.\u003c\/li\u003e\n  \u003cli\u003eEngineered to match OEM specifications for fit and function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-00-00\u003c\/td\u003e\n        \u003ctd\u003eOriginal part number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded.\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-02-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-03-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-04-00\u003c\/td\u003e\n        \u003ctd\u003eLatest OEM revision.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3356\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3412\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent kit.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHJ\u003c\/td\u003e\n        \u003ctd\u003eYHJB-63V\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory Marine\u003c\/td\u003e\n        \u003ctd\u003e9-43254\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eParsun\u003c\/td\u003e\n        \u003ctd\u003ePAF15-06060001\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model and year in the table below to ensure accurate fitment.\u003c\/p\u003e\n\u003cp\u003eThis kit is designed for a range of Yamaha 2-stroke and 4-stroke outboard motors.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF9.9\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998–2008\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF13.5\u003c\/td\u003e\n        \u003ctd\u003e13.5\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2002–2007\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF15\u003c\/td\u003e\n        \u003ctd\u003e15\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998–2007\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF6\u003c\/td\u003e\n        \u003ctd\u003e6\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2008\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF8\u003c\/td\u003e\n        \u003ctd\u003e8\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2008\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e9.9F\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998–2008\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e13.5AWH\u003c\/td\u003e\n        \u003ctd\u003e13.5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2002–2007\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e15F, 15FMH, 15FMHS\u003c\/td\u003e\n        \u003ctd\u003e15\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998–2007\u003c\/td\u003e\n        \u003ctd\u003e63V-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 63V-W0078-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Location\u003c\/dt\u003e\n\u003cdd\u003eLower Unit\/Gearcase\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Insert, Cartridge (63V-44322-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Outer Plate, Cartridge (63V-44323-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller (63V-44352-01-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Seal Damper 2 (647-44366-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Key, Woodruff (664-44338-00-00)\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Bolt (97095-08045-00)\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e1 x O-ring (93210-44704)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and shift the outboard into neutral.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the lower unit (gearcase) to the engine.\u003c\/li\u003e\n  \u003cli\u003eCarefully lower the gearcase, being mindful of the shift shaft linkage.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the old water pump housing assembly.\u003c\/li\u003e\n  \u003cli\u003eClean the mounting surfaces and inspect the housing for wear, replacing if necessary.\u003c\/li\u003e\n  \u003cli\u003eInstall the new cartridge, impeller, key, and plate from the kit. Ensure the impeller vanes are oriented correctly.\u003c\/li\u003e\n  \u003cli\u003eLightly grease the interior of the housing and reinstall it with the new bolts and seals provided.\u003c\/li\u003e\n  \u003cli\u003eRe-attach the lower unit to the engine, ensuring the driveshaft and shift shaft align properly.\u003c\/li\u003e\n  \u003cli\u003eOnce assembled, start the engine in water and verify a strong, consistent stream from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my water pump is failing?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs of a failing water pump include the engine overheating at idle or low speeds, a weak or intermittent water stream from the tell-tale (peephole) outlet, or a completely dry\/brittle impeller found during inspection.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the recommended replacement interval for this kit?\u003c\/summary\u003e\n  \u003cp\u003eFor preventative maintenance and to ensure engine reliability, most marine mechanics recommend replacing the water pump impeller and associated seals every 1 to 2 years or every 100-200 hours of engine use, whichever occurs first.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this kit include the water pump housing?\u003c\/summary\u003e\n  \u003cp\u003eNo, this is a repair kit containing the wearable internal components (impeller, plates, seals, hardware). The water pump housing (Yamaha P\/N 63V-44301-00-00) is a separate component and should be inspected for melting, scoring, or warping and replaced if damaged.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhy are there multiple part numbers for this one kit?\u003c\/summary\u003e\n  \u003cp\u003eManufacturers like Yamaha often revise and update parts over time for design improvements, material changes, or to consolidate previous versions. This kit is built to the latest specification and directly replaces the entire 63V-W0078 series, from -00 to the current -04 revision.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part or an aftermarket one?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow fast is shipping and what does it cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly, with typical transit times of 5–15 days to most regions. Standard shipping is free for most orders. Expedited shipping options, where available, will be presented at checkout.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal operating conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard return window for unused items in their original condition. See our full policy page or contact us for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAlways verify the product images and specifications against your original part before installation. If anything differs—even if your model is listed as compatible—do not purchase or install the part.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an OEM part. Brand names and part numbers are used for reference purposes only.\u003c\/li\u003e\n  \u003cli\u003eFor safety and optimal performance, professional installation by a qualified marine mechanic is highly recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world performance and durability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — With free standard delivery to most regions, you can expect your parts in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with our manufacturing partners, we offer fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723981066555,"sku":"23KY076","price":41.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_6_to_15_hp_63V-44301-00_-_JLM_MARINE-8288887.jpg?v=1763039248","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-yamaha-6-15-hp-replaces-63v-44301-00-63v-w0078-00","provider":"SeaSierra","version":"1.0","type":"link"}