{"product_id":"277181-water-pump-impeller-for-evinrude-johnson-3hp-4hp-5hp-5-5hp-6hp-7-5hp-jlm-marine","title":"277181 Water Pump Impeller for Evinrude Johnson 3HP 4HP 5HP 5.5HP 6HP 7.5HP | JLM Marine","description":"\u003ch2\u003eWater Pump Impeller 277181 – Fits Evinrude Johnson 3HP 4HP 5HP 5.5HP 6HP 7.5HP Outboard Motors\u003c\/h2\u003e\n\n\u003cp\u003eThis aftermarket water pump impeller is designed for \u003cstrong\u003eEvinrude Johnson outboard motors\u003c\/strong\u003e ranging from \u003cstrong\u003e3HP to 7.5HP\u003c\/strong\u003e, manufactured between \u003cstrong\u003e1952 and 1983\u003c\/strong\u003e. It provides reliable cooling system performance for a wide range of classic Johnson and Evinrude models, ensuring your engine operates at optimal temperatures.\u003c\/p\u003e\n\n\u003cp\u003eThis impeller directly replaces OEM part numbers \u003cstrong\u003e277181\u003c\/strong\u003e and \u003cstrong\u003e434424\u003c\/strong\u003e, as well as aftermarket equivalents including \u003cstrong\u003eSierra 18-3001\u003c\/strong\u003e and \u003cstrong\u003eCEF 500350\u003c\/strong\u003e. Engineered with high-performance neoprene rubber and a brass insert, it delivers durability and long-lasting performance in marine environments.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eConstructed from \u003cstrong\u003eneoprene rubber and brass\u003c\/strong\u003e for corrosion resistance and durability\u003c\/li\u003e\n\u003cli\u003eFeatures \u003cstrong\u003e6 flexible blades\u003c\/strong\u003e for efficient water flow\u003c\/li\u003e\n\u003cli\u003eIncludes impeller with \u003cstrong\u003ekey\/pin\u003c\/strong\u003e for easy installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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\u003eJohnson\/Evinrude (OEM)\u003c\/td\u003e\n\u003ctd\u003e277181\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude (OEM)\u003c\/td\u003e\n\u003ctd\u003e434424\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCEF\u003c\/td\u003e\n\u003ctd\u003e500350\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Johnson\/Evinrude owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/johnson-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eJohnson\/Evinrude Serial Number Guide\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eYears\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\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e3HP\u003c\/td\u003e\n\u003ctd\u003e1952-1978\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e1969-1972\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e4HP\u003c\/td\u003e\n\u003ctd\u003e1973-1983\u003c\/td\u003e\n\u003ctd\u003eFor water pump using 1 water tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e5HP\u003c\/td\u003e\n\u003ctd\u003e1965-1968\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e5.5HP\u003c\/td\u003e\n\u003ctd\u003e1954-1964\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e6HP\u003c\/td\u003e\n\u003ctd\u003e1972-1978\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJohnson Evinrude\u003c\/td\u003e\n\u003ctd\u003e7.5HP\u003c\/td\u003e\n\u003ctd\u003e1954-1958\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\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNeoprene Rubber and Brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Blades\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImpeller Height\u003c\/td\u003e\n\u003ctd\u003e12.8 mm \/ 0.50 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Diameter\u003c\/td\u003e\n\u003ctd\u003e69 mm \/ 2.72 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft Diameter\u003c\/td\u003e\n\u003ctd\u003e11 mm \/ 0.44 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e1.4 oz (approx. 45 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e1 × Outboard Rubber Impeller with Key \/ Pin\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the fuel line and remove the lower unit from the outboard motor following your engine's service manual.\u003c\/li\u003e\n\u003cli\u003eRemove the water pump housing and locate the old impeller inside the pump body.\u003c\/li\u003e\n\u003cli\u003eCarefully extract the old impeller, noting the direction of the blade rotation. Remove the old key\/pin from the driveshaft.\u003c\/li\u003e\n\u003cli\u003eClean the pump housing and driveshaft thoroughly, removing any debris, corrosion, or old gasket material.\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller blades with water pump grease or glycerin to ease installation and protect the rubber.\u003c\/li\u003e\n\u003cli\u003eInsert the new key\/pin into the driveshaft slot, ensuring it is seated properly.\u003c\/li\u003e\n\u003cli\u003eAlign the impeller keyway with the key\/pin and slide the impeller onto the driveshaft. Rotate the blades in the correct direction (typically counterclockwise when viewed from above).\u003c\/li\u003e\n\u003cli\u003eInstall a new gasket on the pump housing and carefully position the housing over the impeller.\u003c\/li\u003e\n\u003cli\u003eSecure the housing with the original bolts, tightening in a crisscross pattern to the manufacturer's torque specifications.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit onto the outboard motor, ensuring all fasteners are properly torqued.\u003c\/li\u003e\n\u003cli\u003eReconnect the fuel line and perform a water flow test by running the engine with the motor submerged or using flushing muffs.\u003c\/li\u003e\n\u003cli\u003eCheck for consistent water discharge from the tell-tale hole, confirming proper impeller function.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this impeller fits my engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Cross-reference your engine's horsepower and year range with the compatibility table above. Verify that your original impeller matches the dimensions listed (69 mm diameter, 6 blades, 11 mm shaft). If your engine uses OEM part numbers 277181 or 434424, this impeller is the correct replacement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: Most manufacturers recommend replacing the impeller every 2–3 years or 200–300 hours of operation, whichever comes first. If you notice reduced cooling efficiency, overheating, or visible blade damage during inspection, replace it immediately regardless of time elapsed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs of a failing impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include weak or no water flow from the tell-tale (indicator) stream, engine overheating, steam from the engine, or an audible high-temperature alarm. Inspect the impeller if any of these occur.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will this impeller fit 4HP models from 1973–1983?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, but \u003cstrong\u003eonly for water pumps using 1 water tube\u003c\/strong\u003e. Some 4HP models in this year range may have different water pump configurations, so verify your pump design before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Should I lubricate the impeller before installation?\u003c\/strong\u003e\u003cbr\u003e\nA: Absolutely. Coat the impeller blades with water pump grease, glycerin, or a silicone-based lubricant before installation. This prevents the rubber from tearing during the first dry start and extends impeller life.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM or aftermarket impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51940928192825,"sku":"17IO004K","price":11.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/10.webp?v=1771121278","url":"https:\/\/jlmmarine.com\/es\/products\/277181-water-pump-impeller-for-evinrude-johnson-3hp-4hp-5hp-5-5hp-6hp-7-5hp-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}