{"product_id":"sierra-18-3001-johnson-evinrude-impeller","title":"Sierra 3001 Johnson\/Evinrude Impeller","description":"\u003cp\u003eThe Sierra 18-3001 is a six-blade replacement water pump impeller for select vintage Johnson, Evinrude and OMC outboards. It installs inside the lower-unit water pump housing and circulates cooling water through the engine. This impeller is intended for \u003cstrong\u003emetal water pump housings\u003c\/strong\u003e and replaces OEM numbers 277181 and 434424. Applications using a plastic pump housing require a different impeller.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra manufacturer part number: 18-3001\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eOutside diameter: approximately 2.75 inches\u003c\/li\u003e\n\u003cli\u003eThickness: approximately 0.50 inch\u003c\/li\u003e\n\u003cli\u003eShaft bore: approximately 0.43 inch\u003c\/li\u003e\n\u003cli\u003eKey slot: approximately 0.145 inch\u003c\/li\u003e\n\u003cli\u003eDesigned for metal water pump housings\u003c\/li\u003e\n\u003cli\u003eDrive key is not included\u003c\/li\u003e\n\u003cli\u003eReplaces Johnson\/Evinrude\/OMC 277181 and 434424\u003c\/li\u003e\n\u003cli\u003eUPC: 030999237118\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDocumented applications include select Johnson and Evinrude outboards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3 HP: 1952–1978\u003c\/li\u003e\n\u003cli\u003e4 HP: 1969–1972\u003c\/li\u003e\n\u003cli\u003e4 HP: 1973–1983 when equipped with a one-water-tube pump\u003c\/li\u003e\n\u003cli\u003e5 HP: 1965–1968\u003c\/li\u003e\n\u003cli\u003e5.5 HP: 1954–1964\u003c\/li\u003e\n\u003cli\u003e6 HP: 1952–1978\u003c\/li\u003e\n\u003cli\u003e7.5 HP: 1954–1958\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExact compatibility depends on the complete engine model number and the type of water pump housing installed.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDo not select this impeller by horsepower or approximate year alone. Older Johnson and Evinrude engines may use different water pumps within the same horsepower range.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete engine model number\u003c\/li\u003e\n\u003cli\u003eProduction year\u003c\/li\u003e\n\u003cli\u003eMetal water pump housing\u003c\/li\u003e\n\u003cli\u003eOne- or two-water-tube configuration where applicable\u003c\/li\u003e\n\u003cli\u003eOEM impeller number 277181 or 434424\u003c\/li\u003e\n\u003cli\u003eImpeller diameter, thickness and shaft bore\u003c\/li\u003e\n\u003cli\u003eDrive-key arrangement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor applications with a plastic water pump housing, verify the correct alternative impeller rather than using Sierra 18-3001.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace the impeller if:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCooling-water discharge becomes weak or intermittent\u003c\/li\u003e\n\u003cli\u003eThe engine begins running hotter than normal\u003c\/li\u003e\n\u003cli\u003eThe blades are cracked, torn, stiff or permanently bent\u003c\/li\u003e\n\u003cli\u003ePieces are missing from the blades\u003c\/li\u003e\n\u003cli\u003eThe rubber has developed a permanent set from storage\u003c\/li\u003e\n\u003cli\u003eThe centre hub slips inside the impeller\u003c\/li\u003e\n\u003cli\u003eThe engine has been operated without cooling water\u003c\/li\u003e\n\u003cli\u003eThe water pump's preventive-maintenance interval has been reached\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRegular inspection is particularly important on older outboards that may be operated only seasonally.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eLower-unit removal is normally required to access the water pump. During service:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect the ignition and battery where applicable\u003c\/li\u003e\n\u003cli\u003eFollow the correct shift-linkage and lower-unit removal procedure\u003c\/li\u003e\n\u003cli\u003eConfirm that the pump uses a metal housing\u003c\/li\u003e\n\u003cli\u003eInspect the housing, wear plate, key, water-tube grommet and seals\u003c\/li\u003e\n\u003cli\u003eRemove any broken impeller fragments from the cooling passages\u003c\/li\u003e\n\u003cli\u003eReuse the existing key only if it is undamaged, or obtain the correct replacement separately\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller with clean soapy water or approved assembly lubricant\u003c\/li\u003e\n\u003cli\u003ePosition the key correctly\u003c\/li\u003e\n\u003cli\u003eRotate the driveshaft in its normal operating direction while lowering the housing over the blades\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit according to the engine service manual\u003c\/li\u003e\n\u003cli\u003eConfirm strong cooling-water flow before operating under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNever operate the outboard without an adequate cooling-water supply.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra: 18-3001\u003c\/li\u003e\n\u003cli\u003eSierra catalogue reference: 118-3001\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude\/OMC: 277181\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude\/OMC: 0277181\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude\/OMC: 434424\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude\/OMC: 0434424\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89580\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45216\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45216-10\u003c\/li\u003e\n\u003cli\u003eCEF: 500350\u003c\/li\u003e\n\u003cli\u003eUPC: 030999237118\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe most important distinction with Sierra 18-3001 is the pump housing material. It is designed for the older \u003cstrong\u003emetal-housing water pump\u003c\/strong\u003e. Confirming both OEM number 277181 or 434424 and the housing type prevents confusion with similar-looking impellers used in later plastic pump housings.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCompatible \u0026amp; Related Products\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOther Sierra Johnson\/Evinrude impellers available at Marisol Marine:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3002-johnson-evinrude-impeller\"\u003eSierra 3002 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3043-johnson-evinrude-impeller\"\u003eSierra 3043 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3083-johnson-evinrude-impeller\"\u003eSierra 3083 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3090-johnson-evinrude-impeller\"\u003eSierra 3090 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3050-johnson-evinrude-impeller\"\u003eSierra 3050 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3051-johnson-evinrude-impeller\"\u003eSierra 3051 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156142391332,"sku":"47-3001","price":37.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-3001.jpg?v=1784926907","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3001-johnson-evinrude-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}