{"product_id":"water-pump-impeller-repair-kit-fits-yamaha-f40-f70-4-stroke-replaces-6cj-w0078-00-6cj-w0078-01-00","title":"Water Pump Impeller Repair Kit – Fits Yamaha F40\/F70 4-Stroke (Replaces 6CJ-W0078-00\/6CJ-W0078-01-00)","description":"\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Repair Kit\u003c\/strong\u003e is engineered for Yamaha F40 and F70 4-Stroke outboard engines manufactured between 2011 and 2016 (models 6CY1-6CY7 and 6CJ1-6CJ7). It provides all necessary components to restore your engine’s cooling system to factory-level performance, ensuring optimal reliability and preventing overheating issues.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Yamaha part numbers 6CJ-W0078-00-00 and 6CJ-W0078-01-00, and interchanges with Quicksilver 8M6012800 and Sierra 18-3494.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for direct OEM replacement, ensuring a precise fit.\u003c\/li\u003e\n\u003cli\u003eConstructed with a premium rubber impeller and stainless steel hardware for durability in marine environments.\u003c\/li\u003e\n\u003cli\u003eManufactured in an ISO9002 certified facility to meet or exceed original equipment specifications.\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      \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      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-01-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eQuicksilver\u003c\/td\u003e\n        \u003ctd\u003e8M6012800\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3494\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\u003eFor Yamaha owners, this kit is specifically designed for F40 models designated 6CY1 through 6CY7 and F70 models designated 6CJ1 through 6CJ7.\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\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\u003eF40\u003c\/td\u003e\n        \u003ctd\u003e40\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2011–2016\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-00-00\/6CJ-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eModels 6CY1 to 6CY7\u003c\/td\u003e\n      \u003c\/tr\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\u003e2011–2016\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-00-00\/6CJ-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eModels 6CJ1 to 6CJ7\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 Impeller Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003ePremium rubber (impeller), Stainless steel (hardware)\u003c\/dd\u003e\n  \u003cdt\u003eCompatibility\u003c\/dt\u003e\n\u003cdd\u003eF40 and F70 Yamaha 4-stroke outboards\u003c\/dd\u003e\n  \u003cdt\u003eManufacturing Standards\u003c\/dt\u003e\n\u003cdd\u003eISO9002 certified factory\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eManufactured to OEM specifications\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 Water Pump Impeller (\u003cspan style=\"color:#d0021b;\"\u003e6CJ-W0078-00-00\u003c\/span\u003e)\u003c\/li\u003e\n  \u003cli\u003e1 x Housing Cover\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller Key\u003c\/li\u003e\n  \u003cli\u003e1 x O-ring\u003c\/li\u003e\n  \u003cli\u003e1 x Oil Seal\u003c\/li\u003e\n  \u003cli\u003e1 x Wear Plate\u003c\/li\u003e\n  \u003cli\u003e1 x Water Seal Damper\u003c\/li\u003e\n  \u003cli\u003e1 x Set of Water Pump Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 x Pin\u003c\/li\u003e\n  \u003cli\u003e1 x Set of Bolts and Washers\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 negative battery cable before starting work.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit (gearcase) from the outboard engine. You may need to disconnect the speedometer tube.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the water pump housing to access the old impeller.\u003c\/li\u003e\n  \u003cli\u003eSlide the old impeller off the driveshaft, removing the impeller key. Note the direction of the old vanes.\u003c\/li\u003e\n  \u003cli\u003eClean the housing interior and wear plate of any debris or corrosion. Replace the plate and gaskets.\u003c\/li\u003e\n  \u003cli\u003eInstall the new impeller key and slide the new impeller onto the driveshaft, rotating it in a clockwise direction to bend the vanes correctly.\u003c\/li\u003e\n  \u003cli\u003eReinstall the housing, applying a non-permanent sealant to the bolts if required.\u003c\/li\u003e\n  \u003cli\u003eRe-attach the lower unit to the engine, ensuring all connections are secure. Once assembled, test the engine in water to confirm a strong water stream from the tell-tale outlet.\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\n  \u003csummary\u003eHow do I know if this kit fits my Yamaha engine?\u003c\/summary\u003e\n  \u003cp\u003eThis kit is specifically for Yamaha F40 and F70 4-Stroke outboards from 2011–2016. Please check your engine's model code; it fits F40 models 6CY1 to 6CY7 and F70 models 6CJ1 to 6CJ7. If your model or year is different, do not purchase.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eCommon symptoms include a weak or inconsistent water stream from the \"tell-tale\" outlet, the engine overheating alarm sounding, or steam coming from the exhaust. Reduced cooling efficiency can cause severe engine damage if not addressed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace the water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eFor preventative maintenance, it is recommended to replace the impeller every 1 to 2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhy is this kit a better choice than buying just an impeller?\u003c\/summary\u003e\n  \u003cp\u003eThis is a complete kit that includes the housing, wear plate, gaskets, and seals. These peripheral parts wear out over time and can cause leaks or reduce pump efficiency even with a new impeller. Replacing all components at once ensures a reliable, long-lasting repair.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between part number 6CJ-W0078-00-00 and 6CJ-W0078-01-00?\u003c\/summary\u003e\n  \u003cp\u003eThe part number 6CJ-W0078-01-00 is a supersession, meaning it is a newer revision that has replaced the older 6CJ-W0078-00-00 part number. They are functionally identical and fully interchangeable. Our kit is a direct replacement for both.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I install this water pump kit myself?\u003c\/summary\u003e\n  \u003cp\u003eYes, installation is possible for those with mechanical experience and the correct tools. However, due to the critical nature of the engine's cooling system, professional installation is always recommended to ensure safety and correct function.\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\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\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":50723975201083,"sku":"23KY715","price":75.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_F40_-_F70_6CJ-W0078-00_-_JLM_MARINE-8289383.jpg?v=1763038990","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-repair-kit-fits-yamaha-f40-f70-4-stroke-replaces-6cj-w0078-00-6cj-w0078-01-00","provider":"SeaSierra","version":"1.0","type":"link"}