{"product_id":"water-pump-impeller-kit-fits-yamaha-150-300-hp-outboards-replaces-61a-w0078-a4-00-61a-w0078-a2-00-61a-w0078-a3-00","title":"Water Pump Impeller Kit – Fits Yamaha 150-300 HP Outboards (Replaces 61A-W0078-A4-00, 61A-W0078-A2-00, 61A-W0078-A3-00)","description":"\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 comprehensive \u003cstrong\u003eWater Pump Impeller Kit\u003c\/strong\u003e provides all necessary components for a complete service of the water pump on Yamaha 2-Stroke \u0026amp; 4-Stroke V6 150–300 HP outboard engines (1997–2014). It is designed for F150, F175, F200, F225, F250, and F300 models.\u003c\/p\u003e\n  \u003cp\u003eThe kit serves as a direct replacement for Yamaha OEM parts 61A-W0078-A4-00, 61A-W0078-A3-00, and 61A-W0078-A2-00. It also interchanges with aftermarket equivalents including Sierra 18-3396-1 and Mallory 9-48618.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation Location:\u003c\/strong\u003e Mounts in the Lower Unit\/Gearcase.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Features a housing made from high-strength Nylon PA66 plastic.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete Assembly:\u003c\/strong\u003e Includes the impeller, housing, wear plate, gaskets, Woodruff key, and all required hardware.\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 suppliers.\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\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eCurrent OEM part; supersedes earlier versions\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A3-00\u003c\/td\u003e\n          \u003ctd\u003eSuperseded by 61A-W0078-A4-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A2-00\u003c\/td\u003e\n          \u003ctd\u003eSuperseded by 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3396-1\u003c\/td\u003e\n          \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMallory\u003c\/td\u003e\n          \u003ctd\u003e9-48618\u003c\/td\u003e\n          \u003ctd\u003eAftermarket cross-reference\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 and year in the table below to ensure correct fitment.\u003c\/p\u003e\n  \u003cp\u003eThis kit is designed for the following V6 Yamaha outboard models. Please verify your specific model and year range.\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\u003eF150\u003c\/td\u003e\n          \u003ctd\u003e150\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1997–2014\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF175\u003c\/td\u003e\n          \u003ctd\u003e175\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1997–2014\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF200\u003c\/td\u003e\n          \u003ctd\u003e200\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1997–2014\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF225\u003c\/td\u003e\n          \u003ctd\u003e225\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1997–2014\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003eF250\u003c\/td\u003e\n          \u003ctd\u003e250\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1997–2005\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\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\u003e2004–2005\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eSupersedes 61A-W0078-A3-00\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYamaha\u003c\/td\u003e\n          \u003ctd\u003e150-300 HP\u003c\/td\u003e\n          \u003ctd\u003e150-300\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1997–2005\u003c\/td\u003e\n          \u003ctd\u003e61A-W0078-A4-00\u003c\/td\u003e\n          \u003ctd\u003eV6 models, supersedes 61A-W0078-A3-00\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 Kit with Housing\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 Fit\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eNylon PA66 Plastic\u003c\/dd\u003e\n    \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n    \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (Aftermarket)\u003c\/dd\u003e\n    \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eKit includes impeller, housing, insert cup, wear plate, gaskets, key, pins, 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 Cartridge Insert (61A-44322-02-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Gasket (6E5-44315-A0-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller (6E5-44352-01-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Cartridge Outer Plate (6G5-44323-01-00)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e4 x\u003c\/span\u003e Bolt with Washer (90119-08M14-00)\u003c\/li\u003e\n    \u003cli\u003e1 x Woodruff Key (90280-04M05-00)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (93210-37M67-00)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (93210-86M38-00)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Dowel Pin (93606-12019-00)\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 remove the propeller for safety.\u003c\/li\u003e\n    \u003cli\u003ePlace a drain pan under the lower unit and remove the drain screw to empty the gearcase oil.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and carefully lower the gearcase from the outboard's upper housing.\u003c\/li\u003e\n    \u003cli\u003eRemove the bolts securing the water pump housing to access the old impeller and components.\u003c\/li\u003e\n    \u003cli\u003eNote the orientation of all parts before removal. Clean all mating surfaces of old gasket material and debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new wear plate, gaskets, and insert cup from the kit.\u003c\/li\u003e\n    \u003cli\u003eSlide the new impeller onto the driveshaft with the Woodruff key properly seated.\u003c\/li\u003e\n    \u003cli\u003eInstall the new housing, apply a light waterproof grease to the interior, and torque bolts to manufacturer specifications.\u003c\/li\u003e\n    \u003cli\u003eRe-install the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.\u003c\/li\u003e\n    \u003cli\u003eRefill the gearcase with fresh marine gear lube to the proper level.\u003c\/li\u003e\n    \u003cli\u003eReconnect the battery, start the engine on a water supply (flushing muffs), and confirm a steady stream of water from the tell-tale port.\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\u003eHow do I confirm this kit fits my engine?\u003c\/summary\u003e\n    \u003cp\u003eThe best way is to check the Part Number Matrix and Engine \u0026amp; Model Compatibility tables on this page. Compare the OEM part numbers listed to your engine's service manual. Visually comparing the old pump to our product photos can also help confirm fitment.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failing water pump?\u003c\/summary\u003e\n    \u003cp\u003eCommon symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the \"tell-tale\" outlet, or an audible alarm from the engine's warning system. Steam from the engine cowling is also a critical indicator.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should a water pump impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a preventative maintenance item, most manufacturers recommend replacing the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. Refer to your owner's manual for specific service intervals.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a complete kit with the housing?\u003c\/summary\u003e\n    \u003cp\u003eYes, this is a complete water pump repair kit that includes the impeller, housing, gaskets, wear plate, and all necessary hardware shown in the \"What's in the Box\" section. No other components are typically needed for a standard replacement.\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\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","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723779838267,"sku":"MxtJM7J7x4B","price":39.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/MxtJM7J7x4B.png?v=1763031608","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-yamaha-150-300-hp-outboards-replaces-61a-w0078-a4-00-61a-w0078-a2-00-61a-w0078-a3-00","provider":"SeaSierra","version":"1.0","type":"link"}