{"product_id":"679-44316-a0-water-pump-impeller-gasket-for-yamaha-c40-jlm-marine","title":"679-44316-A0 Water Pump Impeller Gasket for Yamaha C40 | JLM Marine","description":"\u003ch2\u003eWater Pump Impeller Gasket – Fits Yamaha 2-Stroke 40 HP C40 Outboard | 679-44316-A0\u003c\/h2\u003e\n\n\u003cp\u003eThis water pump impeller gasket is designed for \u003cstrong\u003eYamaha 2-stroke 40 HP outboard engines\u003c\/strong\u003e, specifically the \u003cstrong\u003eC40 series (1990–1997)\u003c\/strong\u003e. It also fits select \u003cstrong\u003eOMC Cobra stern drive models (235 and 240)\u003c\/strong\u003e from the 1970s. Engineered to create a reliable seal within the water pump housing, this gasket helps maintain optimal cooling system performance and prevents leaks during operation.\u003c\/p\u003e\n\n\u003cp\u003eThis gasket directly replaces Yamaha OEM part numbers \u003cstrong\u003e679-44316-A0\u003c\/strong\u003e and \u003cstrong\u003e679-44316-A1\u003c\/strong\u003e, ensuring seamless compatibility with your original equipment. It is an essential component for routine water pump maintenance and rebuild procedures.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for Yamaha part numbers 679-44316-A0 and 679-44316-A1\u003c\/li\u003e\n  \u003cli\u003eSuitable for both Yamaha outboard engines and OMC Cobra stern drives\u003c\/li\u003e\n  \u003cli\u003eCritical gasket for water pump rebuild and maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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\u003e679-44316-A0\u003c\/td\u003e\n      \u003ctd\u003ePrimary OEM number\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e679-44316-A1\u003c\/td\u003e\n      \u003ctd\u003eSuperseded part number\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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\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\u003eC40\u003c\/td\u003e\n        \u003ctd\u003e40 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1990–1991\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eC40\u003c\/td\u003e\n        \u003ctd\u003e40 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1992–1997\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra\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\u003eStern Drive\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra\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\u003eStern Drive\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra\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\u003eStern Drive\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e679-44316-A0\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSuperseded Part Numbers\u003c\/td\u003e\n      \u003ctd\u003e679-44316-A1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eWater Pump Impeller Gasket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePrimary Fitment\u003c\/td\u003e\n      \u003ctd\u003eYamaha 2-Stroke 40 HP (C40)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSecondary Fitment\u003c\/td\u003e\n      \u003ctd\u003eOMC Cobra Stern Drive (235, 240)\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eYour purchase includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × Water Pump Impeller Gasket (679-44316-A0)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisconnect the fuel line\u003c\/strong\u003e and remove the engine cowling to access the lower unit. Ensure the engine is completely off and cool before starting.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove the lower unit\u003c\/strong\u003e by disconnecting the shift linkage and unbolting the mounting hardware. Carefully separate the lower unit from the mid-section.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccess the water pump housing\u003c\/strong\u003e by removing the propeller, propeller shaft, and any retaining components securing the pump assembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisassemble the water pump\u003c\/strong\u003e by removing the pump housing bolts and separating the housing from the lower unit. Take note of the orientation of all components.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove the old impeller gasket\u003c\/strong\u003e from the mating surfaces. Clean all residue, old gasket material, and debris thoroughly using a gasket scraper and solvent.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInspect all water pump components\u003c\/strong\u003e including the impeller, housing, and wear plate for damage or excessive wear. Replace any worn parts as needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePosition the new gasket\u003c\/strong\u003e (679-44316-A0) onto the clean, dry mating surface, ensuring proper alignment with all bolt holes and passages.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReassemble the water pump housing\u003c\/strong\u003e by installing the impeller (lubricate with glycerin or soapy water) and securing the housing with bolts in a star pattern to ensure even torque.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReinstall the lower unit\u003c\/strong\u003e onto the mid-section, reconnecting the shift linkage and tightening all mounting bolts to manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReattach the propeller shaft and propeller\u003c\/strong\u003e, ensuring all hardware is properly secured and torqued to specification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReconnect the fuel line\u003c\/strong\u003e and replace the engine cowling. Perform a visual inspection to ensure all connections are secure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTest the cooling system\u003c\/strong\u003e by running the engine in a test tank or on-water and verifying proper water discharge from the telltale indicator.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this gasket fits my Yamaha engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine model is a Yamaha C40 40 HP 2-stroke manufactured between 1990 and 1997. Cross-reference your current gasket's part number with 679-44316-A0 or 679-44316-A1, or consult the Yamaha parts diagram for your specific serial number.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the water pump impeller gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the gasket every time you service or rebuild the water pump assembly, typically every 2–3 years or 200–300 hours of operation. Always use a new gasket during impeller replacement to ensure a proper seal and prevent leaks.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that this gasket needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include visible coolant leaks around the water pump housing, reduced water flow from the telltale indicator, engine overheating, or water contamination in the lower unit. If you notice any of these issues, inspect and replace the gasket immediately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gasket if it looks undamaged?\u003c\/strong\u003e\u003cbr\u003e\nA: No, it is not recommended to reuse old gaskets even if they appear intact. Gaskets compress and conform to mating surfaces during use, and reusing them can result in improper sealing, leaks, and potential engine damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will this gasket fit OMC Cobra stern drive models?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, this gasket is compatible with OMC Cobra 235 (1971, 1975–1977) and 240 (1978) stern drive models. Confirm your model and year match the compatibility table before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM or aftermarket gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51962603864377,"sku":"2199","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_75095bf4-6153-447e-9be8-c60c03f68392.png?v=1771804955","url":"https:\/\/jlmmarine.com\/products\/679-44316-a0-water-pump-impeller-gasket-for-yamaha-c40-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}