{"product_id":"water-pump-repair-kit-fits-yamaha-f300-f350-300-350-hp-replaces-yamaha-6aw-w0078-00-sierra-18-3477","title":"Water Pump Repair Kit – Fits Yamaha F300\/F350 300-350 HP (Replaces Yamaha 6AW-W0078-00, Sierra 18-3477)","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 \u003cstrong\u003eWater Pump Repair Kit – Fits Yamaha F300\/F350 Outboard Motors (Replaces 6AW-W0078-00)\u003c\/strong\u003e is designed for Yamaha 4-Stroke outboard motors from 300–350 HP, specifically models F300, F350, LF300, and LF350 manufactured between 2007 and 2011. It provides all necessary components for a complete and reliable water pump service to restore cooling system performance.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Yamaha part numbers 6AW-W0078-00, 6AW-W0078-00-00, and Sierra 18-3477.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eEngineered for a direct OEM factory replacement fit.\u003c\/li\u003e\n    \u003cli\u003eKit includes a new impeller, gaskets, O-rings, and all required hardware for a full rebuild.\u003c\/li\u003e\n    \u003cli\u003eNote: This kit is for use with water pump housing 6AW-44311-01-00 (sold separately).\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 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\u003e6AW-W0078-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3477\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\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\u003eF300\u003c\/td\u003e\n        \u003ctd\u003e300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2007–2011\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00\u003c\/td\u003e\n        \u003ctd\u003eV8 Engine\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eLF300\u003c\/td\u003e\n        \u003ctd\u003e300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2007–2011\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00\u003c\/td\u003e\n        \u003ctd\u003eCounter-Rotation V8\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF350\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2007–2011\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00\u003c\/td\u003e\n        \u003ctd\u003eV8 Engine\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eFL350\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2007–2011\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00\u003c\/td\u003e\n        \u003ctd\u003eCounter-Rotation V8\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eLF350\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2007–2011\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00\u003c\/td\u003e\n        \u003ctd\u003eCounter-Rotation V8\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eF350TUR\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2010–2011\u003c\/td\u003e\n        \u003ctd\u003e6AW-W0078-00\u003c\/td\u003e\n        \u003ctd\u003eV8 Engine\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 Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eOEM Factory Direct Replacement\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eFor use with water pump housing 6AW-44311-01-00 (sold separately)\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 Gasket, Water Pump (6AW-44315-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Insert, Cartridge (6AW-44322-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Outer Plate, Cartridge (6AW-44323-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Key (6AW-44336-00-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller (6AW-44352-00-00)\u003c\/li\u003e\n    \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Bolt, With Washer (90119-08M14-00)\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (93210-37M67-00)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (93210-94003-00)\u003c\/li\u003e\n    \u003cli\u003e2 x Pin, Dowel (93606-12019-00)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eDisconnect the battery and ensure the engine is in a safe, stable position.\u003c\/li\u003e\n    \u003cli\u003eDrain the lower unit gear case oil.\u003c\/li\u003e\n    \u003cli\u003eRemove the lower unit (gear case) from the outboard motor.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and remove the existing water pump housing.\u003c\/li\u003e\n    \u003cli\u003eCarefully inspect the housing for wear, scoring, or warping. Replace if damaged.\u003c\/li\u003e\n    \u003cli\u003eRemove the old impeller, gaskets, plates, and seals. Clean all mating surfaces thoroughly.\u003c\/li\u003e\n    \u003cli\u003eInstall the new components from the kit in the reverse order of removal. Lightly grease the new impeller and insert.\u003c\/li\u003e\n    \u003cli\u003eReinstall the water pump housing, ensuring bolts are tightened to the manufacturer's specified torque.\u003c\/li\u003e\n    \u003cli\u003eReattach the lower unit to the outboard, refill the gear case oil, and reconnect the battery.\u003c\/li\u003e\n    \u003cli\u003eStart the engine in a safe environment with a water supply (flushing muffs) to verify proper water flow and check for leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this kit fits my specific Yamaha outboard?\u003c\/summary\u003e\n  \u003cp\u003eThis kit is specifically for the Yamaha F300, LF300, F350, and LF350 (300–350 HP) V8 models made between 2007 and 2011. Always verify your engine model and year against the compatibility table. Do not purchase if your model is not listed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs the water pump housing included in this kit?\u003c\/summary\u003e\n  \u003cp\u003eNo, the water pump housing (part number 6AW-44311-01-00) is not included and must be purchased separately. It is critical to inspect your existing housing for wear, cracks, or warping and replace it if necessary for a successful repair.\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 intermittent water stream from the \"tell-tale\" port, engine overheating alarms, and reduced engine performance. A visual inspection may reveal cracked, brittle, or missing impeller vanes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the recommended replacement interval for the water pump kit?\u003c\/summary\u003e\n  \u003cp\u003eAs a preventative maintenance measure, most marine mechanics recommend replacing the water pump impeller and related components every 1-2 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\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. All our parts are manufactured in an ISO 9002 facility and are batch-inspected for consistency and quality.\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. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. Please see our full policy page or reach out for instructions.\u003c\/p\u003e\n\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":50723965763899,"sku":"23KY099","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_YamahaF300_-_F350_6AW-W0078-00_-_JLM_MARINE-8289078.jpg?v=1763038605","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-yamaha-f300-f350-300-350-hp-replaces-yamaha-6aw-w0078-00-sierra-18-3477","provider":"SeaSierra","version":"1.0","type":"link"}