{"product_id":"water-pump-impeller-kit-fits-yamaha-4-stroke-70hp-f70a-replaces-6cj-w0078-00-6cj-w0078-01-sierra-18-3494","title":"Water Pump Impeller Kit – Fits Yamaha 4-Stroke 70HP F70A (Replaces 6CJ-W0078-00, 6CJ-W0078-01, Sierra 18-3494)","description":"\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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis aftermarket \u003cstrong\u003eWater Pump Impeller Kit\u003c\/strong\u003e is designed for Yamaha 4-Stroke outboard motors, including F70, F70A, F70LA, and F40G models from 2010 to current. It provides all necessary components for a complete water pump service to restore cooling system performance and prevent engine overheating.\u003c\/p\u003e\n  \u003cp\u003eThe kit serves as a direct cross-reference for Yamaha OEM part numbers 6CJ-W0078-00, 6CJ-W0078-01, and 6CJ-W0078-02, and it is an interchange for Sierra part 18-3494.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngineered as a direct OEM-equivalent replacement for a precise fit.\u003c\/li\u003e\n    \u003cli\u003eFeatures a durable neoprene rubber impeller and stainless steel hardware for corrosion resistance.\u003c\/li\u003e\n    \u003cli\u003eA complete kit including the impeller, housing, wear plate, gaskets, seals, and bolts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\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  \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\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\u003e6CJ-W0078-02\u003c\/td\u003e\n          \u003ctd\u003eCurrent active part number.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e6CJ-W0078-01\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 6CJ-W0078-00.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e6CJ-W0078-00\u003c\/td\u003e\n          \u003ctd\u003eOriginal part number.\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\u003eAftermarket interchange.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\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 to fit the following Yamaha outboard models. Always verify your specific model and year range 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\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\u003eF70\u003c\/td\u003e\n          \u003ctd\u003e70\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2010–Current\u003c\/td\u003e\n          \u003ctd\u003e6CJ-W0078-00\u003c\/td\u003e\n          \u003ctd\u003eSuperseded by 6CJ-W0078-01, 6CJ-W0078-02\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF70A\u003c\/td\u003e\n          \u003ctd\u003e70\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2010–Current\u003c\/td\u003e\n          \u003ctd\u003e6CJ-W0078-00\u003c\/td\u003e\n          \u003ctd\u003eSuperseded by 6CJ-W0078-01, 6CJ-W0078-02\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–Current\u003c\/td\u003e\n          \u003ctd\u003e6CJ-W0078-00\u003c\/td\u003e\n          \u003ctd\u003eModels 0113, 0114, 0115, 0116, 0310, 0410, 0112, 0411\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF40G\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n          \u003ctd\u003e6CJ-W0078-00\u003c\/td\u003e\n          \u003ctd\u003eMentioned in product description\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\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\u003eNeoprene Rubber Impeller, Stainless Steel\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.26 kg (0.57 lb)\u003c\/dd\u003e\n    \u003cdt\u003eOther Attributes\u003c\/dt\u003e\n\u003cdd\u003eComplete kit with all required gaskets, seals, and hardware\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Neoprene Impeller (6H3-44352-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cup, Insert (63D-44322-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Plate, Wear (6CJ-44323-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Gasket (6CJ-44315-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Gasket (6CJ-44316-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Gasket (6CJ-44324-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Housing Cover (63D-44312-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Grommet (663-44366-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (93210-46044)\u003c\/li\u003e\n    \u003cli\u003e1 x Woodruff Key (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\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x Dowel Pin (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\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery and shift the outboard into neutral.\u003c\/li\u003e\n    \u003cli\u003eRemove the lower unit (gearcase) from the outboard midsection. This typically requires removing several bolts.\u003c\/li\u003e\n    \u003cli\u003ePlace the lower unit on a workbench and locate the water pump housing, usually found on top of the gearcase.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and remove the water pump housing cover to access the impeller.\u003c\/li\u003e\n    \u003cli\u003eRemove the old impeller, wear plate, gaskets, and seals. Note the orientation of the impeller vanes.\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 gaskets, seals, wear plate, and insert cup from the kit.\u003c\/li\u003e\n    \u003cli\u003eInstall the new impeller. Lightly lubricate the inside of the housing and turn the driveshaft clockwise while pushing down to seat the impeller. The vanes should bend in a clockwise direction.\u003c\/li\u003e\n    \u003cli\u003eReinstall the housing cover and tighten the bolts to the manufacturer's specified torque.\u003c\/li\u003e\n    \u003cli\u003eReinstall the lower unit onto the outboard, ensuring the water tube and shift shaft are properly aligned.\u003c\/li\u003e\n    \u003cli\u003eOnce assembled, start the engine in water and verify that a steady stream of water is exiting the \"telltale\" outlet.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\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 intermittent water stream from the engine's telltale outlet, engine overheating alarms, or a \"hot engine\" warning light. Upon inspection, a worn impeller may have cracked, brittle, or broken vanes.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the water pump impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a general rule, inspect the impeller annually and replace it every 1 to 2 years or every 100 to 200 hours of operation, whichever comes first. Replacement intervals should be shorter if operating in sandy, silty, or saltwater environments.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this kit include the housing?\u003c\/summary\u003e\n    \u003cp\u003eYes, this is a comprehensive repair kit that includes the Water Pump Housing Cover (63D-44312-00-00), along with the impeller, insert cup, wear plate, gaskets, seals, and all hardware required for a full service.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this kit fit my Yamaha F40G outboard?\u003c\/summary\u003e\n    \u003cp\u003eThis kit is listed as compatible with certain Yamaha F40G models. However, because specific model years are not fully defined, we strongly recommend verifying that your engine's required part number matches one of the references in the Part Number Matrix before purchasing.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need any special tools or sealants for installation?\u003c\/summary\u003e\n    \u003cp\u003eBasic mechanic's tools are required. While no special tools are typically needed, a torque wrench is recommended for tightening bolts to factory specifications. A thin layer of marine grease on the new impeller can aid installation, but no other sealants are usually necessary.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this kit for saltwater or freshwater use?\u003c\/summary\u003e\n    \u003cp\u003eThe components, including the stainless steel hardware and neoprene impeller, are designed for reliable performance in both saltwater and freshwater environments.\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). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch inspections 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 is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available for your location.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\n    \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\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\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\n","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723973235003,"sku":"MRKY23KY715","price":42.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/MRKY23KY715.png?v=1763038896","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-4-stroke-70hp-f70a-replaces-6cj-w0078-00-6cj-w0078-01-sierra-18-3494","provider":"SeaSierra","version":"1.0","type":"link"}