{"product_id":"water-pump-impeller-kit-fits-yamaha-4-5hp-replaces-6e0-w0078-a2-00","title":"Water Pump Impeller Kit – Fits Yamaha 4-5HP (Replaces 6E0-W0078-A2-00)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\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 *\/\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\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.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\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eWater Pump Impeller Kit\u003c\/strong\u003e provides all the necessary components for a complete service of the water pump on select Yamaha and Mariner outboards. It is engineered for a precise fit on Yamaha 2-Stroke 4HP (1984–1999) \u0026amp; 5HP (1984–2002) and 4-Stroke F4 (1999–2008) models, ensuring reliable cooling performance.\u003c\/p\u003e\n\u003cp\u003eThe kit serves as a direct cross-reference for Yamaha OEM part numbers 6E0-W0078-A2-00, 6E0-W0078-A3-00, 6E0-W0078-02-00, and several other equivalents, making it a versatile solution for maintenance and repairs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for direct replacement of the factory water pump assembly.\u003c\/li\u003e\n\u003cli\u003eIncludes all essential gaskets, plates, and hardware required for a full rebuild.\u003c\/li\u003e\n\u003cli\u003eBuilt with quality materials that meet or exceed OEM specifications for durability in marine environments.\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 suppliers.\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        \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\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003ePrimary Replacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A3-00\u003c\/td\u003e\n        \u003ctd\u003eInterchangeable\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-02-00\u003c\/td\u003e\n        \u003ctd\u003eInterchangeable\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eInterchangeable\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-00-00\u003c\/td\u003e\n        \u003ctd\u003eInterchangeable\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003ctd\u003eAM6E0-W0078-A2\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003ctd\u003eHJ YHJB-6E0\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\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model and year in the tables below. Proper fitment is critical.\u003c\/p\u003e\n\u003cp\u003eFor Yamaha applications, this kit covers specific 4HP and 5HP models across 2-stroke and 4-stroke platforms from 1984 to 2008.\u003c\/p\u003e\n\u003cp\u003eFor Mariner outboards, this kit fits specific 4HP and 5HP models designated with serial numbers starting in 6E0 or 6E3. Please verify your engine's serial number before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Compatible Engine Models\"\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\u003e4A, 4AC, 4ACMH, 4CMH\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–1999\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e4MLHU, 4MLHU2, 4MSHU, 4MSHU2\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1996\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e5C, 5CM, 5CMH\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1984–2002\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e5MLHU, 5MLHU2, 5MSHU, 5MSHU2\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1996\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF4\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2008\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003e4A(6E0)\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003eModels with Serial Number 6E0\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003e5C(6E3)\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003eModels with Serial Number 6E3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMariner\u003c\/td\u003e\n        \u003ctd\u003e96325T, 96325M\u003c\/td\u003e\n        \u003ctd\u003e4, 5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e6E0-W0078-A2-00\u003c\/td\u003e\n        \u003ctd\u003eOnly with Serial Number 6E0 \u0026amp; 6E3\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\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eHigh-quality materials designed to OEM specifications\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 Housing (6E0-44311-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Gasket (6E0-44315-A0-00)\u003c\/li\u003e\n\u003cli\u003e1 x Cartridge Insert (6E0-44322-02-00)\u003c\/li\u003e\n\u003cli\u003e1 x Cartridge Outer Plate (6E0-44323-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Impeller (6E0-44352-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Water Seal Damper 2 (6E0-44366-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Dowel Pin (93604-09066-00)\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Bolt (97080-06045-00\/97095-06045-00)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eBefore starting, disconnect the negative battery cable for safety.\u003c\/li\u003e\n\u003cli\u003ePosition a drain pan and carefully remove the lower unit (gearcase) from the outboard's midsection.\u003c\/li\u003e\n\u003cli\u003eLocate the water pump housing on top of the gearcase and remove its mounting bolts.\u003c\/li\u003e\n\u003cli\u003eLift off the housing and remove the old impeller, wear plate, and any gaskets. Note the orientation of the impeller vanes.\u003c\/li\u003e\n\u003cli\u003eThoroughly clean all mating surfaces, removing any old gasket material or corrosion.\u003c\/li\u003e\n\u003cli\u003eInstall the new gasket, wear plate, and cartridge insert from the kit.\u003c\/li\u003e\n\u003cli\u003eSlide the new impeller onto the driveshaft, ensuring the key or keyway is properly aligned. Turn the driveshaft clockwise to seat the vanes correctly inside the new housing.\u003c\/li\u003e\n\u003cli\u003eApply a light coat of marine grease to the inside of the housing and on the impeller.\u003c\/li\u003e\n\u003cli\u003eSecure the new housing with the provided bolts, tightening them to the manufacturer's specified torque in a crisscross pattern.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit, ensuring the driveshaft and shift shaft align correctly.\u003c\/li\u003e\n\u003cli\u003eOnce assembled, test the engine in a water-filled barrel or with a flush attachment to confirm a strong, steady stream of water from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow can I confirm this kit will fit my specific motor?\u003c\/summary\u003e\n  \u003cp\u003eThe most reliable method is to check your motor's model and serial number against the Engine \u0026amp; Model Compatibility table on this page. For Mariner applications, verifying the serial number prefix (e.g., 6E0, 6E3) is essential as year ranges can be unclear.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common symptoms of a worn or failed impeller?\u003c\/summary\u003e\n  \u003cp\u003eThe most common signs include a weak or non-existent water stream from the \"tell-tale\" outlet, an engine overheating alarm, or a noticeable reduction in engine performance. A damaged impeller cannot pump enough water to cool the engine effectively.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should a water pump impeller be replaced?\u003c\/summary\u003e\n  \u003cp\u003eAs a preventative maintenance item, it is recommended to replace the impeller and gaskets every 1 to 2 years, or every 100-200 hours of operation, whichever comes first. This interval may be shorter if you frequently operate in sandy, silty, or saltwater conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eMy old bolts have a slightly different part number. Can I use the bolts in this kit?\u003c\/summary\u003e\n  \u003cp\u003eYes. This kit includes bolts that cover common variations like 97080-06045-00 and 97095-06045-00. These are typically interchangeable for this specific water pump application, and our kits are confirmed to fit the models listed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs any special grease required for installation?\u003c\/summary\u003e\n  \u003cp\u003eYes, it is highly recommended to apply a light coat of a water-resistant marine grease (like lithium or silicone-based) to the inside of the pump housing and to the new impeller. This lubricates the impeller on its first dry start and helps it seat correctly.\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\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — 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":50723969007931,"sku":"17KY004","price":46.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_4HP_5HP___6E0-W0078-A2-00_6E0-W0078-02-00_6E0-W0078-01-00_6E0-W0078-00-00_-_JLM_MARINE-8286392.jpg?v=1763038741","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-4-5hp-replaces-6e0-w0078-a2-00","provider":"SeaSierra","version":"1.0","type":"link"}