{"product_id":"water-pump-impeller-kit-fits-yamaha-40-50-hp-2-stroke-f40-f50-f60-4-stroke-replaces-yamaha-sierra","title":"Water Pump Impeller Kit – Fits Yamaha 40-50 HP 2-Stroke \u0026 F40\/F50\/F60 4-Stroke (Replaces Yamaha, Sierra)","description":"\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 *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.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 *\/\ntable.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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis complete \u003cstrong\u003eWater Pump Impeller Kit – Fits Yamaha 40-50 HP 2-Stroke \u0026amp; F40\/F50\/F60 4-Stroke (Replaces 63D-W0078-01-00)\u003c\/strong\u003e provides all necessary components to rebuild your outboard's water pump. It is designed for reliable performance in Yamaha 40-50 HP 2-Stroke (1994–2005) and F40\/F50\/F60 4-Stroke (1996+) engines.\u003c\/p\u003e\n  \u003cp\u003eIt serves as a direct replacement for Yamaha part numbers 63D-W0078-01-00, 63D-W0078-02-00, and Sierra 18-3370.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngineered for direct-fit installation, simplifying maintenance.\u003c\/li\u003e\n    \u003cli\u003eIncludes the essential impeller, housing, gaskets, and O-ring for a full service.\u003c\/li\u003e\n    \u003cli\u003eConstructed with a durable composite housing and a robust neoprene impeller for longevity.\u003c\/li\u003e\n  \u003c\/ul\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 Cross-Reference\"\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\u003e63D-W0078-01-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e63D-W0078-02-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3370\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\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  \u003cp\u003eFits the following Yamaha 2-stroke and 4-stroke outboard models.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine and 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\u003eF40\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996+\u003c\/td\u003e\n          \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003e747cc, 3-cylinder\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF50\u003c\/td\u003e\n          \u003ctd\u003e50\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996+\u003c\/td\u003e\n          \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003e747cc, 3-cylinder\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF60\u003c\/td\u003e\n          \u003ctd\u003e60\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996+\u003c\/td\u003e\n          \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003e747cc, 3-cylinder\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1994–2005\u003c\/td\u003e\n          \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e50\u003c\/td\u003e\n          \u003ctd\u003e50\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1994–2005\u003c\/td\u003e\n          \u003ctd\u003e63D-W0078-01-00\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Impeller Kit\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003ePlastic\/Composite\u003c\/dd\u003e\n    \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eRubber\/Neoprene\u003c\/dd\u003e\n    \u003cdt\u003eKit Components\u003c\/dt\u003e\n\u003cdd\u003eIncludes complete rebuild components (impeller, housing, gaskets, O-ring)\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eLimited 3-year Pleasure\/Government, 1-Year Commercial\u003c\/dd\u003e\n  \u003c\/dl\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Water Pump Impeller (63D-W0078-01-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Housing\u003c\/li\u003e\n    \u003cli\u003e1 x Metal Cup\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery and shift the outboard to the neutral position.\u003c\/li\u003e\n    \u003cli\u003eRemove the lower unit bolts and carefully separate the lower unit from the engine.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and remove the old water pump housing and impeller assembly.\u003c\/li\u003e\n    \u003cli\u003eClean the mounting surfaces, ensuring they are free of old gasket material and debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new metal cup, impeller, and housing, applying a light marine grease to the impeller.\u003c\/li\u003e\n    \u003cli\u003eReinstall the lower unit, ensuring the driveshaft and water tube align correctly. Fasten all bolts to the manufacturer's torque specifications.\u003c\/li\u003e\n    \u003cli\u003eReconnect the battery and test the engine in the water, verifying water is exiting the tell-tale port.\u003c\/li\u003e\n  \u003c\/ol\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if this kit fits my Yamaha outboard?\u003c\/summary\u003e\n    \u003cp\u003eThis kit is designed for Yamaha 40-50 HP 2-Stroke engines (1994–2005) and F40\/F50\/F60 4-Stroke models (1996+). Please verify your engine's model and year against our compatibility table before ordering.\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 a weak or non-existent water stream from the tell-tale port, engine overheating alarms, and a noticeable decrease in engine performance. If you notice any of these symptoms, inspect your water pump immediately.\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\u003eFor preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-3 years, depending on usage hours and water conditions (e.g., saltwater, silty water).\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). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected 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 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\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\n  \u003c\/details\u003e\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  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003eManufacturer-Direct Value — 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":50723974250811,"sku":"23DC203","price":28.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23DC203.jpg?v=1763038951","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-40-50-hp-2-stroke-f40-f50-f60-4-stroke-replaces-yamaha-sierra","provider":"SeaSierra","version":"1.0","type":"link"}