{"product_id":"water-pump-impeller-with-key-fits-yamaha-4hp-5hp-6hp-replaces-6e0-44352-00-18-3073-500325-9-45611","title":"Water Pump Impeller with Key – Fits Yamaha 4HP 5HP 6HP (Replaces 6E0-44352-00, 18-3073, 500325, 9-45611)","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 with Key\u003c\/strong\u003e is an aftermarket replacement designed for Yamaha 4HP, 5HP, and 6HP outboard motors. It fits both 2-stroke and 4-stroke engines manufactured from 1984 and up, ensuring reliable cooling system performance across a wide range of models including Yamaha F4, F6, and legacy 4HP\/5HP units.\u003c\/p\u003e\n\n\u003cp\u003eThis impeller directly replaces Yamaha OEM part numbers 6E0-44352-00, 6E0-44352-01, and 6E0-44352-03, as well as aftermarket equivalents from Sierra Marine (18-3073), CEF Marine (500325), and Mallory Marine (9-45611).\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes impeller key\/pin for secure installation\u003c\/li\u003e\n  \u003cli\u003e6-blade rubber design with precise OEM-spec dimensions\u003c\/li\u003e\n  \u003cli\u003eCompatible with both 2-stroke and 4-stroke Yamaha outboards\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\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\u003e6E0-44352-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-44352-01\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-44352-03\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra Marine\u003c\/td\u003e\n        \u003ctd\u003e18-3073\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCEF Marine\u003c\/td\u003e\n        \u003ctd\u003e500325\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory Marine\u003c\/td\u003e\n        \u003ctd\u003e9-45611\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\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      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF4\u003c\/td\u003e\n        \u003ctd\u003e4 hp\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF6\u003c\/td\u003e\n        \u003ctd\u003e6 hp\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2006 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e4 hp\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–1999\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e5 hp\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–2002\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\u003eBlades\u003c\/dt\u003e\n  \u003cdd\u003e6\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Height\u003c\/dt\u003e\n  \u003cdd\u003e12.6 mm \/ 0.50 inch\u003c\/dd\u003e\n  \u003cdt\u003eOverall Diameter\u003c\/dt\u003e\n  \u003cdd\u003e40.0 mm \/ 1.57 inch\u003c\/dd\u003e\n  \u003cdt\u003eHub Shaft Diameter\u003c\/dt\u003e\n  \u003cdd\u003e11.0 mm \/ 0.43 inch\u003c\/dd\u003e\n  \u003cdt\u003eNet Weight\u003c\/dt\u003e\n  \u003cdd\u003e0.35 oz\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\u003eOutboard Rubber Impeller with Key \/ Pin\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect fuel line and remove engine cowling to access the lower unit.\u003c\/li\u003e\n  \u003cli\u003eDrain lower unit gear oil completely before disassembly.\u003c\/li\u003e\n  \u003cli\u003eRemove water pump housing bolts and carefully separate the housing from the lower unit.\u003c\/li\u003e\n  \u003cli\u003eExtract the old impeller using pliers or an impeller puller; note the rotation direction of the blades.\u003c\/li\u003e\n  \u003cli\u003eClean the impeller chamber thoroughly, removing all debris, old gasket material, and corrosion.\u003c\/li\u003e\n  \u003cli\u003eLubricate the new impeller blades with glycerin or waterproof grease—never petroleum-based products.\u003c\/li\u003e\n  \u003cli\u003eInsert the impeller key into the driveshaft slot, ensuring it is fully seated.\u003c\/li\u003e\n  \u003cli\u003eInstall the new impeller by hand, bending blades in the correct rotational direction.\u003c\/li\u003e\n  \u003cli\u003eReplace the water pump gasket and O-rings; reattach the housing and torque bolts to manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003eRefill lower unit with appropriate gear oil and check for leaks.\u003c\/li\u003e\n  \u003cli\u003eRun the engine with water supply (muffs or tank) and verify steady water flow from the tell-tale port.\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 when to replace my impeller?\u003c\/summary\u003e\n  \u003cp\u003eReplace your impeller annually or every 200–300 operating hours, whichever comes first. Signs of failure include overheating, reduced or no water flow from the tell-tale, cracked or missing blades, and loss of engine power under load.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWill this impeller fit my specific Yamaha model?\u003c\/summary\u003e\n  \u003cp\u003eThis impeller is designed for Yamaha 4HP, 5HP, and 6HP outboards (both 2-stroke and 4-stroke) from 1984 onward. Cross-check your engine's model and serial number with the compatibility table above, and verify your current impeller part number matches one of the OEM references listed.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWhat's the correct way to install the impeller key?\u003c\/summary\u003e\n  \u003cp\u003eThe key must be inserted into the driveshaft slot before mounting the impeller. Ensure it sits flush and does not protrude beyond the shaft surface. The impeller hub will slide over the key, locking the impeller to the driveshaft for proper rotation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse the old gasket and O-rings?\u003c\/summary\u003e\n  \u003cp\u003eNo. Always replace gaskets and O-rings during impeller service to prevent leaks and ensure proper sealing. Reusing worn seals can lead to water intrusion, overheating, and premature impeller failure.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWhy is my engine still overheating after impeller replacement?\u003c\/summary\u003e\n  \u003cp\u003eCheck for blockages in the cooling passages, a damaged water pump housing, incorrect impeller installation (blades bent the wrong direction), a faulty thermostat, or a clogged tell-tale port. Ensure the impeller key is correctly seated and the pump plate is properly aligned.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWhat lubricant should I use on the impeller?\u003c\/summary\u003e\n  \u003cp\u003eUse glycerin, waterproof grease, or dishwashing liquid. Never use petroleum-based lubricants, as they will degrade the rubber and cause premature failure.\u003c\/p\u003e\n\u003c\/details\u003e\n\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\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\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":51025915511099,"sku":"UK17IY015","price":14.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_e9cfe596-fe90-4299-9327-aa126170c0f0.jpg?v=1773220535","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-with-key-fits-yamaha-4hp-5hp-6hp-replaces-6e0-44352-00-18-3073-500325-9-45611","provider":"SeaSierra","version":"1.0","type":"link"}