{"product_id":"water-pump-repair-kit-fits-yamaha-9-9hp-15hp-4-stroke-replaces-63v-w0078-01-00-63v-w0078-00-00","title":"Water Pump Repair Kit – Fits Yamaha 9.9HP \u0026 15HP 4-Stroke (Replaces 63V-W0078-01-00, 63V-W0078-00-00)","description":"\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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eWater Pump Repair Kit – Fits Yamaha 9.9HP \u0026amp; 15HP 4-Stroke Outboard Engines\u003c\/strong\u003e is designed for consistent performance and durability. It provides a reliable solution for maintaining the cooling system on Yamaha 9.9HP and 15HP 4-Stroke outboard engines manufactured from 1996 to the present, including F15, F9.9, and high-thrust T9.9 models.\u003c\/p\u003e\n  \u003cp\u003eThis kit serves as a direct replacement for OEM part numbers 63V-W0078-01-00 and 63V-W0078-00-00, and is a cross-reference for Sierra parts 18-3433 and 18-3412.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEnables direct OEM-spec replacement for a perfect fit.\u003c\/li\u003e\n    \u003cli\u003eAvailable in two primary versions: with or without the water pump housing.\u003c\/li\u003e\n    \u003cli\u003eEngineered for marine environments to ensure longevity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\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-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003eOEM Part\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e63V-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003eOEM Part\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, includes housing.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3433\u003c\/td\u003e\n          \u003ctd\u003eAftermarket equivalent, without housing.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSeaSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3412\u003c\/td\u003e\n          \u003ctd\u003eAftermarket equivalent, includes housing.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSeaSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3433\u003c\/td\u003e\n          \u003ctd\u003eAftermarket equivalent, without housing.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; 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\u003eF15\u003c\/td\u003e\n          \u003ctd\u003e15\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998–2004\u003c\/td\u003e\n          \u003ctd\u003e63V-W0078-01-00, 63V-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\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\u003e1996–2004\u003c\/td\u003e\n          \u003ctd\u003e63V-W0078-01-00, 63V-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003e\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\u003e2005–Present\u003c\/td\u003e\n          \u003ctd\u003e63V-W0078-01-00, 63V-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003eAlso listed as \"2006 and Later\"\u003c\/td\u003e\n        \u003c\/tr\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\u003e2005–Present\u003c\/td\u003e\n          \u003ctd\u003e63V-W0078-01-00, 63V-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003eAlso listed as \"2006 and Later\"\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eT9.9\u003c\/td\u003e\n          \u003ctd\u003e9.9\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–Present\u003c\/td\u003e\n          \u003ctd\u003e63V-W0078-01-00, 63V-W0078-00-00\u003c\/td\u003e\n          \u003ctd\u003eHigh thrust models\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Impeller Repair Kit\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMetal\/Aluminum (varies by kit version)\u003c\/dd\u003e\n    \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.270 kg (0.595 lb)\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (varies by distributor)\u003c\/dd\u003e\n    \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eTwo versions available: with or without housing\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cp\u003e\u003cstrong\u003eWith Housing (18-3412 Version):\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Impeller (18-3040)\u003c\/li\u003e\n    \u003cli\u003e1 x Insert Cup (18-3444)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Housing (18-3356)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller Plate (18-3195)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Seal Damper (18-1833)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller Key (NSS)\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eWithout Housing (18-3433 Version):\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Impeller\u003c\/li\u003e\n    \u003cli\u003eGaskets and Seals\u003c\/li\u003e\n    \u003cli\u003eHardware Components\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery and remove the engine cover.\u003c\/li\u003e\n    \u003cli\u003eDrain the lower unit gear lube.\u003c\/li\u003e\n    \u003cli\u003eRemove the propeller and the lower unit mounting bolts.\u003c\/li\u003e\n    \u003cli\u003eCarefully slide the lower unit off the driveshaft housing.\u003c\/li\u003e\n    \u003cli\u003eRemove the old water pump housing bolts and lift the housing.\u003c\/li\u003e\n    \u003cli\u003eSlide the old impeller off the driveshaft, noting the keyway position.\u003c\/li\u003e\n    \u003cli\u003eClean all surfaces and install the new gaskets, plate, cup, and impeller.\u003c\/li\u003e\n    \u003cli\u003eReassemble the housing and torque bolts to manufacturer specifications.\u003c\/li\u003e\n    \u003cli\u003eReinstall the lower unit, refill with gear lube, and test the engine's cooling system.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich kit do I need—with or without housing?\u003c\/summary\u003e\n    \u003cp\u003eChoose the kit with housing (18-3412) if your existing housing is corroded, cracked, or warped. If your housing is in good condition, the kit without housing (18-3433) is a cost-effective choice for replacing just the impeller and seals.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eCommon signs include the engine overheating at idle or low speeds, a weak or non-existent \"telltale\" water stream, or a dry, cracked, or brittle impeller upon inspection. Reduced cooling performance can cause significant engine damage.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the water pump impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a general maintenance rule, it is recommended to inspect the impeller annually and replace it every 1 to 2 years, or after every 100-200 hours of use, depending on operating conditions (especially in saltwater or sandy\/silty water).\u003c\/p\u003e\n  \u003c\/details\u003e\n    \u003cdetails\u003e\n    \u003csummary\u003eDoes this fit all Yamaha 9.9HP engines?\u003c\/summary\u003e\n    \u003cp\u003eThis kit is specifically for 4-Stroke models (F9.9, T9.9) from 1996 to present. It does not fit 2-Stroke models. Always verify your engine's full model name and year before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch-inspections for consistency.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n    \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window if the product is unused and in its original condition. See our policy page or reach out for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement part, not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\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 tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723777315131,"sku":"QM-23KY705","price":22.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/QM-23KY705.png?v=1763031562","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-yamaha-9-9hp-15hp-4-stroke-replaces-63v-w0078-01-00-63v-w0078-00-00","provider":"SeaSierra","version":"1.0","type":"link"}