{"product_id":"water-pump-impeller-kit-fits-yamaha-f40-f70-4-stroke-replaces-6cj-w0078-00-00","title":"Water Pump Impeller Kit – Fits Yamaha F40\/F70 4-Stroke (Replaces 6CJ-W0078-00-00)","description":"\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Kit – Fits Yamaha F40\/F70 4-Stroke (Replaces 6CJ-W0078-00-00)\u003c\/strong\u003e contains all necessary components to service the water pump assembly on compatible Yamaha 4-stroke outboard motors. It includes the impeller, gaskets, seals, plates, and hardware for a complete overhaul.\u003c\/p\u003e\n\u003cp\u003eThis kit directly replaces Yamaha 6CJ-W0078-00-00, 6CJ-W0078-01-00; Sierra 18-3494; and Quicksilver 8M6012800.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for direct OEM-level replacement and installation.\u003c\/li\u003e\n\u003cli\u003eFeatures stainless steel components and a durable rubber impeller for longevity.\u003c\/li\u003e\n\u003cli\u003eEngineered to provide higher cooling flow to protect the engine from overheating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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\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\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\u003eSuperseded By\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\u003e6CJ-W0078-00-00\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-01-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3494\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eQuicksilver\u003c\/td\u003e\n        \u003ctd\u003e8M6012800\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\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis kit is confirmed for Yamaha F70 models and listed by some vendors for F40 models. Verify your specific OEM part number before ordering.\u003c\/p\u003e\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\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\u003eF70\u003c\/td\u003e\n        \u003ctd\u003e70\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-00-00\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 6CJ-W0078-01-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF40\u003c\/td\u003e\n        \u003ctd\u003e40\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-00-00\u003c\/td\u003e\n        \u003ctd\u003eDirect replacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eStainless steel components with rubber impeller\u003c\/dd\u003e\n  \u003cdt\u003ePackage Type\u003c\/dt\u003e\n\u003cdd\u003eComplete kit with all components\u003c\/dd\u003e\n  \u003cdt\u003ePrimary Components\u003c\/dt\u003e\n\u003cdd\u003eImpeller, housing cover, gaskets, seals\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eDesigned to provide higher cooling flow to protect engine\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Insert, Cartridge (63D-44322-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket, Water Pump (6CJ-44315-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Cover, Pump Housing (63D-44312-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Damper, Water Seal 2 (663-44366-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Impeller (6H3-44352-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Key, Woodruff (90280-03M03-00)\u003c\/li\u003e\n\u003cli\u003e2 x Oil Seal (93101-23070-00)\u003c\/li\u003e\n\u003cli\u003e1 x O-Ring (93210-46044-00)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket, Water Pump (6CJ-44316-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Outer Plate, Cartridge (6CJ-44323-00-00)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket, Cartridge (6CJ-44324-00-00)\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Pin, Dowel (93604-10M03-00)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Bolt, With Washer (90119-08M33-00)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Bolt, With Washer (90119-08M14-00)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and remove the engine cover.\u003c\/li\u003e\n\u003cli\u003ePlace the outboard in neutral and drain the gearcase oil from the lower unit.\u003c\/li\u003e\n\u003cli\u003eRemove the bolts securing the lower unit to the upper casing and carefully lower it.\u003c\/li\u003e\n\u003cli\u003eUnbolt and remove the water pump housing to access the old impeller and components.\u003c\/li\u003e\n\u003cli\u003eClean all mating surfaces thoroughly, removing any old gasket material or sealant.\u003c\/li\u003e\n\u003cli\u003eInstall the new Woodruff key, impeller, seals, and gaskets as provided in the kit. Ensure the impeller vanes are oriented correctly.\u003c\/li\u003e\n\u003cli\u003eReassemble the pump housing, torquing bolts to manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit, ensuring the driveshaft and water tube align correctly.\u003c\/li\u003e\n\u003cli\u003eRefill the gearcase with fresh oil before starting the engine.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the tell-tale outlet, and a dry, brittle, or cracked appearance on the old impeller upon inspection.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should I replace the impeller?\u003c\/summary\u003e\u003cp\u003eFor optimal reliability, most marine mechanics recommend replacing the water pump impeller and gaskets every 1-2 years or every 100-200 hours of operation, whichever comes first.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this kit fit my Yamaha F40?\u003c\/summary\u003e\u003cp\u003eThis kit is listed as compatible with certain Yamaha F40 4-Stroke models by multiple aftermarket sources. However, as year ranges are not confirmed, we strongly recommend verifying the OEM part number (6CJ-W0078-00-00) for your specific engine before purchasing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between part number 6CJ-W0078-00-00 and 6CJ-W0078-01-00?\u003c\/summary\u003e\u003cp\u003eThe part number 6CJ-W0078-01-00 superseded (replaced) 6CJ-W0078-00-00. They are functionally identical, and this kit serves as a replacement for both OEM versions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I reuse my old gaskets or seals?\u003c\/summary\u003e\u003cp\u003eNo. Always use the new gaskets and seals included in the kit to ensure a watertight and reliable repair. Reusing old components can lead to leaks and premature pump failure.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the pump housing included?\u003c\/summary\u003e\u003cp\u003eThis kit includes the pump housing cover (63D-44312-00-00) and other essential wear items like the cartridge insert and outer plate, but not the main lower housing body.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\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\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\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\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\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\u003c\/section\u003e\n\u003csection\u003e\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\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723975233851,"sku":"SIE-17KY003","price":25.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_YamahaF40_-_F70_6CJ-W0078-00_-_JLM_MARINE-8289200.jpg?v=1763038993","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-f40-f70-4-stroke-replaces-6cj-w0078-00-00","provider":"SeaSierra","version":"1.0","type":"link"}