{"product_id":"663-44324-a0-water-pump-impeller-gasket-for-yamaha-40hp-50hp-jlm-marine","title":"663-44324-A0 Water Pump Impeller Gasket for Yamaha 40HP 50HP | JLM Marine","description":"\u003ch2\u003eWater Pump Impeller Gasket – Fits Yamaha 2-Stroke 40HP \u0026amp; 50HP Outboards (663-44324-A0)\u003c\/h2\u003e\n\n\u003cp\u003eThis water pump impeller gasket is engineered to fit Yamaha 2-stroke outboard engines from 40HP to 55HP across multiple model years. It ensures a reliable seal within your water pump housing, preventing leaks and maintaining optimal cooling system performance.\u003c\/p\u003e\n\n\u003cp\u003eDirect replacement for Yamaha OEM part number \u003cstrong\u003e663-44324-A0\u003c\/strong\u003e. Designed for straightforward installation in compatible Yamaha outboard models spanning 1984–1996.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePrecision-cut gasket for water pump impeller assembly\u003c\/li\u003e\n  \u003cli\u003eCompatible with Yamaha 2-stroke engines: 40HP, 50HP, and 55HP\u003c\/li\u003e\n  \u003cli\u003eEssential component for water pump service and rebuild\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    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYamaha\u003c\/td\u003e\n      \u003ctd\u003e663-44324-A0\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\u003eOEM Part No.\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\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e40 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–1994\u003c\/td\u003e\n        \u003ctd\u003e663-44324-A0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e50 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–1987\u003c\/td\u003e\n        \u003ctd\u003e663-44324-A0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003ePro Series 50\u003c\/td\u003e\n        \u003ctd\u003e50 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1987–1990\u003c\/td\u003e\n        \u003ctd\u003e663-44324-A0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eP50\u003c\/td\u003e\n        \u003ctd\u003e50 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1995–1996\u003c\/td\u003e\n        \u003ctd\u003e663-44324-A0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e55 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e663-44324-A0\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\u003ePart Type\u003c\/td\u003e\n      \u003ctd\u003eWater Pump Impeller Gasket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e663-44324-A0\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eYamaha Outboard 2-Stroke Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHorsepower Range\u003c\/td\u003e\n      \u003ctd\u003e40HP – 55HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eEngine Type\u003c\/td\u003e\n      \u003ctd\u003e2-Stroke\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\u003eEach package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 x Water Pump Impeller Gasket (663-44324-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\u003eDisconnect the fuel line and remove the engine cowling to access the lower unit. Ensure the engine is completely cool before beginning work.\u003c\/li\u003e\n  \u003cli\u003eDrain the lower unit gear oil and remove the propeller. Disconnect the shift linkage carefully.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the lower unit from the midsection. Set it on a clean workspace.\u003c\/li\u003e\n  \u003cli\u003eRemove the water pump housing bolts and carefully separate the housing. Take note of the orientation of existing components.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller gasket and inspect the housing and base plate for corrosion or damage. Clean all mating surfaces thoroughly.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket (663-44324-A0) onto the water pump base plate, ensuring proper alignment with all bolt holes.\u003c\/li\u003e\n  \u003cli\u003eInstall the impeller, drive key, and any other water pump components per your service manual specifications.\u003c\/li\u003e\n  \u003cli\u003eReassemble the water pump housing, torquing bolts to manufacturer specifications in a crisscross pattern. Do not overtighten.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit onto the midsection, reconnect the shift linkage, and secure all mounting bolts.\u003c\/li\u003e\n  \u003cli\u003eRefill the lower unit with the correct grade and quantity of gear oil. Reinstall the propeller.\u003c\/li\u003e\n  \u003cli\u003eReconnect the fuel line and reinstall the cowling. Start the engine and verify strong water flow from the tell-tale (pilot hole).\u003c\/li\u003e\n  \u003cli\u003eCheck for leaks around the water pump housing and lower unit seals during the test run.\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 outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Check the compatibility table above for your engine's horsepower, stroke type, and year range. Cross-reference your existing part number (663-44324-A0) or consult your engine's parts diagram using the Yamaha Parts Catalog link provided.\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 replace the water pump impeller—typically every 2–3 years or 200–300 hours of operation. Always use a new gasket; never reuse old gaskets as they may leak.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my water pump gasket is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Symptoms include weak or no water flow from the tell-tale, engine overheating, coolant leaks around the lower unit, or visible water seepage from the pump housing. Inspect and replace the gasket during routine water pump maintenance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gasket if it looks okay?\u003c\/strong\u003e\u003cbr\u003e\nA: No. Gaskets compress and conform to mating surfaces during use; reusing them risks improper sealing, leaks, and potential engine damage from overheating. Always install a new gasket during water pump service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM or aftermarket part?\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":51966114496825,"sku":"2297","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_c2a5a163-8474-4720-bfeb-15b03754a6f0.jpg?v=1771923900","url":"https:\/\/jlmmarine.com\/es\/products\/663-44324-a0-water-pump-impeller-gasket-for-yamaha-40hp-50hp-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}