{"product_id":"water-pump-impeller-kit-fits-yamaha-f40-f70-4-stroke-replaces-6cj-w0078-00-6cj-w0078-01","title":"Water Pump Impeller Kit – Fits Yamaha F40\/F70 4-Stroke (Replaces 6CJ-W0078-00, 6CJ-W0078-01)","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\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis complete \u003cstrong\u003eWater Pump Impeller Kit – Fits Yamaha F40\/F70 4-Stroke 2010–2016 (Replaces 6CJ-W0078-00, 6CJ-W0078-01)\u003c\/strong\u003e provides all necessary components to service the water pump assembly in compatible Yamaha outboard lower units. It is designed for specific Yamaha F40 (6CY) and F70 (6CJ) 4-Stroke models manufactured between 2010 and 2016.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for Yamaha OEM part numbers 6CJ-W0078-00-00 and 6CJ-W0078-01-00, as well as Sierra 18-3494, JLM Marine AM6CJ-W0078-00, and Forestity 6CJ-W0078-00.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls in the lower unit (gearcase) to restore cooling system performance.\u003c\/li\u003e\n  \u003cli\u003eIncludes a new impeller, gaskets, seals, and housing cover for a complete rebuild.\u003c\/li\u003e\n  \u003cli\u003eOffers a choice between genuine OEM and high-quality aftermarket options.\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\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\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\u003eJLM Marine\u003c\/td\u003e\n        \u003ctd\u003eAM6CJ-W0078-00\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eForestity\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-00\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\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 specifically designed for Yamaha outboards. Please verify your model code (e.g., F70LA) and year range to ensure correct fitment.\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\u003e2010–2016\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      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF70LA\u003c\/td\u003e\n        \u003ctd\u003e70\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2010–2021\u003c\/td\u003e\n        \u003ctd\u003e6CJ-W0078-00-00, 6CJ-W0078-01-00\u003c\/td\u003e\n        \u003ctd\u003eAlso F70LA2 models\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\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Impeller Service Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eLower Unit \/ Gearcase\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eDirect Drive\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eGenuine OEM and high-quality aftermarket options available\u003c\/dd\u003e\n\u003c\/dl\u003e\n\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 (663-44366-00-00 \/ 663-44366-01-00)\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\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Oil Seal (93101-23070-00)\u003c\/span\u003e\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\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and place the outboard motor in the neutral gear position.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit (gearcase) from the outboard by unfastening the mounting bolts.\u003c\/li\u003e\n  \u003cli\u003ePosition the lower unit securely on a workbench. Remove the bolts securing the water pump housing.\u003c\/li\u003e\n  \u003cli\u003eCarefully lift the water pump housing, taking note of the position of all parts. Remove the old impeller, gaskets, seals, and wear plate.\u003c\/li\u003e\n  \u003cli\u003eClean all mating surfaces thoroughly, removing any old gasket material or corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstall the new components from the kit in the reverse order of disassembly. Lightly grease the new impeller and insert it while turning the driveshaft clockwise.\u003c\/li\u003e\n  \u003cli\u003eEnsure the Woodruff key is correctly seated and the impeller is properly engaged.\u003c\/li\u003e\n  \u003cli\u003eReinstall the water pump housing and torque its bolts to the manufacturer's specifications.\u003c\/li\u003e\n  \u003cli\u003eReattach the lower unit to the outboard motor.\u003c\/li\u003e\n  \u003cli\u003eOnce fully assembled, start the engine in water and verify a steady stream of water is exiting the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich Yamaha engines does this kit fit?\u003c\/summary\u003e\u003cp\u003eThis kit is confirmed to fit Yamaha 4-Stroke models F40 (2011–2016), F70 (2010–2016), and F70LA (2010–2021). Always check the specific model codes and notes in the compatibility table to ensure a perfect match.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between part 6CJ-W0078-00-00 and 6CJ-W0078-01-00?\u003c\/summary\u003e\u003cp\u003ePart number 6CJ-W0078-01-00 is a direct supersession for 6CJ-W0078-00-00. This means it is the updated version from Yamaha, and the kits are interchangeable. Our kit replaces both versions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should the water pump impeller be replaced?\u003c\/summary\u003e\u003cp\u003eAs a general maintenance rule, the impeller should be inspected annually and replaced every 2-3 years or every 200-300 hours of use, whichever comes first. This interval can be shorter if the engine is operated in saltwater or sandy\/silty conditions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include a weak or non-existent water stream from the tell-tale outlet, engine overheating alarms, and reduced engine performance. If you notice any of these signs, inspect the cooling system immediately.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this kit include the water pump housing?\u003c\/summary\u003e\u003cp\u003eThis is a complete service kit that includes the essential wear items. It contains the Cover, Pump Housing (63D-44312-00-00) and Cartridge Insert (63D-44322-00-00), but not the entire lower pump housing assembly.\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\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\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":50723975692603,"sku":"17KY003","price":37.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Yamaha_70HP_F70A_____6CJ-W0078-00-00_6CJ-W0078-01-00_-_JLM_MARINE-8286384.jpg?v=1763039004","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-f40-f70-4-stroke-replaces-6cj-w0078-00-6cj-w0078-01","provider":"SeaSierra","version":"1.0","type":"link"}