{"product_id":"water-pump-impeller-repair-kit-fits-yamaha-4-5hp-replaces-6f5-w0078-00-6f5-w0078-a0-00","title":"Water Pump Impeller Repair Kit – Fits Yamaha 4-5HP (Replaces 6F5-W0078-00, 6F5-W0078-A0-00)","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\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis is an aftermarket Water Pump Impeller Repair Kit for Yamaha 4-5HP 2-Stroke (1984–2002) and 4HP F4 4-Stroke (1999–2008) outboard motors. It's engineered to restore your engine's cooling system to its original performance, preventing overheating and ensuring reliability on the water.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for Yamaha OEM part numbers 6F5-W0078-00-00, 6F5-W0078-A0-00, and 6E0-W0078-A2-00, providing a complete solution for maintenance or repair.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls as a direct OEM-equivalent replacement.\u003c\/li\u003e\n\u003cli\u003eThe neoprene rubber impeller is designed for durability and efficient water flow.\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary gaskets, seals, plates, and hardware for a full service.\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.\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      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-A0-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\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\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eFor Mariner engines, this kit is only compatible with models having serial numbers starting with 6E0 or 6E3.\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\u003e4A\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–1999\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00\/6F5-W0078-A0-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e5C\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–2002\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00\/6F5-W0078-A0-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF4\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2001\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00\/6F5-W0078-A0-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF4\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2002–2008\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00\/6F5-W0078-A0-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003e4A (6E0)\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00\/6F5-W0078-A0-00\u003c\/td\u003e\n        \u003ctd\u003eOnly with Serial Number 6E0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003e5C (6E3)\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e6F5-W0078-00\/6F5-W0078-A0-00\u003c\/td\u003e\n        \u003ctd\u003eOnly with Serial Number 6E3\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 Impeller Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM Replacement\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene Rubber\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 Water Seal Damper 2 (663-44366-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Cartridge Insert (676-44322-00-00)\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Impeller (6F5-44352-00-00)\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Water Pump Gasket (676-44315-A1-00)\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e1 x Cartridge Outer Plate (676-44323-00-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Cartridge Gasket (676-44324-A1-00)\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Water Pump Gasket (679-44316-A0-00)\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e2 x Bolts (97095-08055-00)\u003c\/li\u003e\n  \u003cli\u003e2 x Bolts (97095-08045-00)\u003c\/li\u003e\n  \u003cli\u003e4 x Washers (92990-08600-00)\u003c\/li\u003e\n  \u003cli\u003e1 x Woodruff Key (90280-04M00-00)\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. Remove the lower unit (gearcase) from the engine.\u003c\/li\u003e\n  \u003cli\u003eLocate and unbolt the water pump housing, then carefully lift it off the driveshaft.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller, woodruff key, wear plate, gaskets, and seals. Take note of their orientation.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all mating surfaces of the pump housing and base to remove old gasket material and corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstall the new water seal damper and cartridge insert into the housing.\u003c\/li\u003e\n  \u003cli\u003ePlace the new woodruff key on the flat spot on the driveshaft.\u003c\/li\u003e\n  \u003cli\u003eApply a light coat of marine grease or a soap\/water solution to the new impeller and install it onto the driveshaft, twisting in a clockwise direction to bend the vanes correctly.\u003c\/li\u003e\n  \u003cli\u003eFit the new gaskets and outer plate into place.\u003c\/li\u003e\n  \u003cli\u003eSlide the water pump housing down over the impeller and driveshaft, ensuring a snug fit. Secure it with the provided bolts, tightening them to the manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, reconnect the battery, and test the engine in water to confirm a strong, steady 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\u003csummary\u003eHow do I know if my water pump impeller needs replacing?\u003c\/summary\u003e\u003cp\u003eCommon signs of a failing impeller include a weak or intermittent water stream from the tell-tale outlet, engine overheating alarms, or a noticeable reduction in water pressure. For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or 100-200 operating hours.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this kit fit an engine model not listed in the compatibility table?\u003c\/summary\u003e\u003cp\u003eNo. To avoid leaks, poor performance, or serious engine damage, you must only purchase this kit if your exact engine model and year range are listed in the compatibility section. Cross-referencing by the OEM part number is also a reliable method.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs it necessary to replace all parts included in the kit?\u003c\/summary\u003e\u003cp\u003eYes. For a comprehensive and reliable repair, it is crucial to replace all included seals, gaskets, O-rings, and the impeller as a complete set. Reusing old components can lead to premature failure and leaks.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I install just the impeller and reuse my old gaskets?\u003c\/summary\u003e\u003cp\u003eThis is strongly discouraged. Gaskets and seals compress and harden over time and will not provide a reliable seal if reused. Always use all new components provided in the kit to ensure the pump is sealed correctly.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the recommended replacement interval for this water pump kit?\u003c\/summary\u003e\u003cp\u003eFor optimal reliability and to prevent overheating, inspect your impeller annually. It is best to replace the full kit every 1-2 years or every 100-200 operating hours, especially if operating in saltwater or silty\/sandy conditions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\u003cp\u003eCovered 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 (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs 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, 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\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","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723968975163,"sku":"22KY013","price":49.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_4_5HP_6F5-W0078_-_JLM_MARINE-8288841.jpg?v=1763038739","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-repair-kit-fits-yamaha-4-5hp-replaces-6f5-w0078-00-6f5-w0078-a0-00","provider":"SeaSierra","version":"1.0","type":"link"}