{"product_id":"water-pump-impeller-gasket-fits-yamaha-40hp-2-stroke-c40-replaces-676-44324-a0","title":"Water Pump Impeller Gasket – Fits Yamaha 40HP 2-Stroke C40 (Replaces 676-44324-A0)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\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  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\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 Impeller Gasket\u003c\/strong\u003e is designed for Yamaha 40HP 2-Stroke C40 outboard engines from 1990–1997, as well as select OMC Cobra stern drive models (235 and 240). Engineered as a direct-fit aftermarket replacement, this gasket ensures reliable sealing within the water pump housing to prevent leaks and maintain optimal cooling performance.\u003c\/p\u003e\n\u003cp\u003eThis gasket directly replaces Yamaha OEM part numbers 676-44324-A0, 676-44324-A0-00, and 676-44324-A1, offering seamless cross-reference compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEssential seal for water pump impeller housing integrity\u003c\/li\u003e\n  \u003cli\u003ePrecision-cut to OEM dimensions for drop-in installation\u003c\/li\u003e\n  \u003cli\u003eCompatible with both outboard and stern drive applications\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        \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\u003e676-44324-A0\u003c\/td\u003e\n        \u003ctd\u003ePrimary OEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e676-44324-A0-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e676-44324-A1\u003c\/td\u003e\n        \u003ctd\u003eSuperseded\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\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      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha Outboard\u003c\/td\u003e\n        \u003ctd\u003eC40\u003c\/td\u003e\n        \u003ctd\u003e40\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1990–1991\u003c\/td\u003e\n        \u003ctd\u003e676-44324-A0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha Outboard\u003c\/td\u003e\n        \u003ctd\u003eC40\u003c\/td\u003e\n        \u003ctd\u003e40\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1992–1997\u003c\/td\u003e\n        \u003ctd\u003e676-44324-A0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra Stern Drive\u003c\/td\u003e\n        \u003ctd\u003e235\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e1971\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra Stern Drive\u003c\/td\u003e\n        \u003ctd\u003e235\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e1975–1977\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra Stern Drive\u003c\/td\u003e\n        \u003ctd\u003e240\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e1978\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\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003ePart Type\u003c\/dt\u003e\n  \u003cdd\u003eWater Pump Impeller Gasket\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eRubber composite sealing material\u003c\/dd\u003e\n  \u003cdt\u003eOEM Replacement For\u003c\/dt\u003e\n  \u003cdd\u003eYamaha 676-44324-A0, 676-44324-A0-00, 676-44324-A1\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eYamaha 40HP 2-Stroke outboards (C40); OMC Cobra stern drives (235, 240)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e1 × Gasket 676-44324-A0\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect battery and remove lower unit per manufacturer service manual procedures.\u003c\/li\u003e\n  \u003cli\u003eRemove water pump housing cover and carefully lift out the impeller assembly.\u003c\/li\u003e\n  \u003cli\u003eClean all mating surfaces thoroughly, removing old gasket material and debris.\u003c\/li\u003e\n  \u003cli\u003eInspect impeller and housing for wear or damage; replace components as needed.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket evenly onto the pump housing, ensuring proper alignment with all bolt holes.\u003c\/li\u003e\n  \u003cli\u003eLubricate the impeller with glycerin or water-pump grease before reinstalling.\u003c\/li\u003e\n  \u003cli\u003eReinstall the impeller, rotating it gently to ensure blades seat correctly within the housing.\u003c\/li\u003e\n  \u003cli\u003eTorque housing bolts to manufacturer specifications in a star pattern to ensure even clamping pressure.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, reconnect the battery, and perform a water flow test before use.\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 gasket needs replacement?\u003c\/summary\u003e\n  \u003cp\u003eSigns include coolant leaks around the pump housing, overheating due to poor seal integrity, visible gasket deterioration during impeller service, or age-related hardening. Replace the gasket anytime you service the impeller to ensure proper sealing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse the old gasket during impeller replacement?\u003c\/summary\u003e\n  \u003cp\u003eNo. Gaskets are single-use components. Reusing a compressed or degraded gasket can cause leaks and lead to engine overheating. Always install a new gasket when servicing the water pump assembly.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this gasket compatible with both outboard and stern drive applications?\u003c\/summary\u003e\n  \u003cp\u003eYes. This gasket fits Yamaha 40HP 2-Stroke C40 outboards (1990–1997) and select OMC Cobra stern drive models (235 and 240 from the 1970s). Confirm your engine model and year before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat happens if the gasket is installed incorrectly?\u003c\/summary\u003e\n  \u003cp\u003eImproper alignment can cause coolant leaks, reduced water flow, or uneven clamping that leads to premature gasket failure. Ensure the gasket is seated evenly and all bolt holes align before tightening the housing cover.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should this gasket be replaced?\u003c\/summary\u003e\n  \u003cp\u003eReplace the gasket every time you service or replace the water pump impeller, typically every 2–3 years or 200–300 hours of operation, whichever comes first. Frequent saltwater use may require more frequent replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this gasket require any sealant during installation?\u003c\/summary\u003e\n  \u003cp\u003eTypically no additional sealant is required if the gasket and mating surfaces are clean and undamaged. Consult your engine's service manual for specific recommendations. Some technicians apply a thin film of grease to aid installation and prevent sticking.\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\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/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, 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\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","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025604378939,"sku":"2200","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_812783d2-7b29-4992-ad4b-3474157735c2.jpg?v=1772927997","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-gasket-fits-yamaha-40hp-2-stroke-c40-replaces-676-44324-a0","provider":"SeaSierra","version":"1.0","type":"link"}