{"product_id":"water-pump-impeller-fits-mercury-mariner-3-5-9-8-hp-replaces-47-89980-47-68988","title":"Water Pump Impeller – Fits Mercury\/Mariner 3.5–9.8 HP (Replaces 47-89980, 47-68988)","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 Impeller\u003c\/strong\u003e is built for reliable performance in vintage Mercury and Mariner 2-stroke outboard motors from 3.5 HP to 9.8 HP, generally covering models from 1966–1986. Engineered as a direct-fit replacement, it ensures proper cooling system function by matching OEM specifications for flow and pressure.\u003c\/p\u003e\n\u003cp\u003eIt directly replaces OEM part numbers Mercury 47-89980 and 47-68988, and serves as an interchange for Sierra 18-3054, Mallory 9-45304, and others.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for direct OEM replacement installation.\u003c\/li\u003e\n  \u003cli\u003eConstructed from durable neoprene with a brass hub.\u003c\/li\u003e\n  \u003cli\u003eManufactured in an ISO9002 certified facility for quality assurance.\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 brands.\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      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-89980 \/ 89980\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-68988 \/ 68988\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3054\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-45304\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e89800\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSEI Marine\u003c\/td\u003e\n        \u003ctd\u003e96-260-03A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCEF\u003c\/td\u003e\n        \u003ctd\u003e500314\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003ctd\u003eAM47-89980\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 and serial number range in the table below. Pay close attention to the drive shaft diameter requirement noted in the Installation and FAQ sections.\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\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e-\u003c\/td\u003e\n        \u003ctd\u003e3.5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 6202173 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e-\u003c\/td\u003e\n        \u003ctd\u003e3.6\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 5404657 \u0026amp; UP, 7145388 \u0026amp; UP, 9252831 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e-\u003c\/td\u003e\n        \u003ctd\u003e4 (1 Cyl)\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 5589202 THRU 0A809600\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eModel 40\u003c\/td\u003e\n        \u003ctd\u003e4 (2 Cyl)\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 5589202 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eModel 45\u003c\/td\u003e\n        \u003ctd\u003e4.5 (1 Cyl)\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 5595532 \u0026amp; UP, 7147238 \u0026amp; UP, 8068065 \u0026amp; UP, 9258281 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eMerc 75\u003c\/td\u003e\n        \u003ctd\u003e7.5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 5206550 \u0026amp; UP, 7125388 \u0026amp; UP, 8057545 \u0026amp; UP, 9217756 \u0026amp; UP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eMerc 110\u003c\/td\u003e\n        \u003ctd\u003e9.8\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1966+\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eS\/N 5206550 \u0026amp; UP, 7127388 \u0026amp; UP, 8057545 \u0026amp; UP, 9217756 \u0026amp; UP\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\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM Replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene with Metal\/Brass Hub\u003c\/dd\u003e\n  \u003cdt\u003eNumber of Blades\u003c\/dt\u003e\n\u003cdd\u003e6\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eInner Diameter: 11.0 mm (0.438 inch), Outer Diameter: 32.0 mm (1.26 inches), Height: 14.4 mm (0.57 inches)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e12.76 g (0.45 oz)\u003c\/dd\u003e\n  \u003cdt\u003eQuality Standard\u003c\/dt\u003e\n\u003cdd\u003eMade to OEM specifications in ISO9002 certified factory\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 Water Pump Impeller (Replaces 47-89980)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003e Before disassembly, confirm your engine's drive shaft diameter is 0.438 inches (11.0 mm). Mercury used multiple shaft sizes on these vintage motors, and this impeller will not fit other diameters.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the battery and remove the engine cover.\u003c\/li\u003e\n  \u003cli\u003ePlace a drain pan under the lower unit and remove the gear oil drain\/fill screws to drain the lubricant.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.\u003c\/li\u003e\n  \u003cli\u003eLocate and unbolt the water pump housing.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller, noting the rotational direction of the existing blades.\u003c\/li\u003e\n  \u003cli\u003eClean the housing interior and install the new impeller. Apply a small amount of marine grease to the housing and impeller.\u003c\/li\u003e\n  \u003cli\u003eReassemble the water pump housing, reattach the lower unit, and refill the gearcase with fresh oil.\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 impeller fits my specific engine?\u003c\/summary\u003e\n  \u003cp\u003e\u003cstrong\u003eThis is critical for vintage Mercury motors.\u003c\/strong\u003e You must physically verify your drive shaft diameter is \u003cstrong\u003e0.438 inches (11.0 mm)\u003c\/strong\u003e. Even if your model and serial number seem to match, Mercury sometimes used different drive shafts. Do not purchase if your shaft diameter is different.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this impeller fit a 5 HP Mercury outboard?\u003c\/summary\u003e\n  \u003cp\u003eNo, this part will not fit 5 HP Mercury models. Those typically require part number 47-16154-3.\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 signs include the engine overheating at idle or low speeds, and a weak or non-existent water stream from the \"telltale\" indicator outlet on the engine.\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, it is best practice to replace the impeller every 100-200 operating hours or at least once per year, especially if operating in saltwater or silty\/sandy conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM Quicksilver\/Mercury part?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is for a high-quality aftermarket replacement, not an OEM component. It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 certified facility, with batch inspections for quality and consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow fast do you ship and what does it cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly, with a typical transit time of 5–15 days for most regions. Standard shipping is free, and expedited options may be available at checkout depending on your location.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eThis part is covered by a 1-year warranty against manufacturing defects under normal use. 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 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 and specifications against 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 part, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and optimal 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 reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days, getting you back on the water faster.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — We deliver fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963830587,"sku":"17IM005K","price":25.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Mercury_35_36_4_45_75_98_HP_47-89980_-_JLM_MARINE-8288504.jpg?v=1763038515","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-fits-mercury-mariner-3-5-9-8-hp-replaces-47-89980-47-68988","provider":"SeaSierra","version":"1.0","type":"link"}