{"product_id":"sierra-18-3002-johnson-evinrude-impeller","title":"Sierra 3002 Johnson\/Evinrude Impeller","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 3002 (18-3002) Impeller\u003c\/strong\u003e is a six-blade replacement water pump impeller for compatible vintage Johnson, Evinrude, and OMC outboards. Installed inside the lower-unit water pump housing, it draws cooling water through the gearcase and circulates it through the engine. Directly replaces Johnson\/Evinrude OEM impeller numbers 375638 and 775518. Included in Sierra 18-3203 impeller kit and 18-3377 water pump kit.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight — Best Use\u003c\/h2\u003e\u003cp\u003eThe Sierra 18-3002 covers a broad range of vintage Johnson and Evinrude outboards (10–35 HP, approx. 1949–1978), but these engines frequently changed water pump designs without any change in horsepower rating. Matching OEM number 375638 or 775518 from the engine parts diagram is far more reliable than relying on the horsepower decal or approximate year. The number stamped on the removed impeller is the strongest fitment confirmation.\u003c\/p\u003e\u003cp\u003eReplace every 2–3 seasons or 200 hours regardless of visible wear. On vintage engines that may have sat for years, inspect the rubber for hardening and brittleness — a common failure mode on stored outboards that can cause sudden cooling loss.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra part number: 18-3002\u003c\/li\u003e\n\u003cli\u003eSix flexible neoprene blades\u003c\/li\u003e\n\u003cli\u003eApproximate outside diameter: 2-3\/4 in.\u003c\/li\u003e\n\u003cli\u003eApproximate depth: 7\/8 in.\u003c\/li\u003e\n\u003cli\u003eApproximate shaft opening: 3\/4 in.\u003c\/li\u003e\n\u003cli\u003eIncluded in Sierra 18-3203 impeller kit and 18-3377 water pump kit\u003c\/li\u003e\n\u003cli\u003eImpeller only — housing, wear plate, key, and seals not included\u003c\/li\u003e\n\u003cli\u003eUPC: 030999237125\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eAssociated with vintage two-stroke Johnson and Evinrude outboards, generally 10–35 HP, approx. 1949–1978, including selected 10, 15, 18, 20, 25, 30, and 35 HP models. Multiple lower-unit and water pump designs were used during this period — always verify by complete engine model number, production year, and OEM impeller number before ordering.\u003c\/p\u003e\u003ch2\u003eAlternate Part Numbers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra: 18-3002 \/ 118-3002\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude\/OMC: 375638, 0375638, 775518, 0775518\u003c\/li\u003e\n\u003cli\u003eRelated J\/E reference: 777829\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89650\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45215, 9-45215-10\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eLower-unit removal is required to access the water pump. During service: inspect the pump housing, wear plate, key, seals, and driveshaft; remove any broken impeller fragments from cooling passages; lubricate the new impeller with clean soapy water or approved assembly lubricant; rotate the driveshaft in its normal operating direction while seating the housing over the blades. Confirm strong cooling-water telltale flow before operating under load. Never operate the outboard without an adequate cooling-water supply.\u003c\/p\u003e\u003ch2\u003eRelated J\/E Impellers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3050-johnson-evinrude-impeller\"\u003eSierra 3050 (18-3050) Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3051-johnson-evinrude-impeller\"\u003eSierra 3051 (18-3051) Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3043-johnson-evinrude-impeller\"\u003eSierra 3043 (18-3043) Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3083-johnson-evinrude-impeller\"\u003eSierra 3083 (18-3083) Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3090-johnson-evinrude-impeller\"\u003eSierra 3090 (18-3090) Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3001-johnson-evinrude-impeller\"\u003eSierra 3001 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3055-johnson-evinrude-impeller\"\u003eSierra 3055 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3058-johnson-evinrude-impeller\"\u003eSierra 3058 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3059-johnson-evinrude-impeller\"\u003eSierra 3059 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-31041-johnson-evinrude-impeller\"\u003eSierra 31041 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible Water Pump Kits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-marine-water-pump-kit-18-3380-johnson-evinrude-40-75hp-cooling-system-rebuild\"\u003eSierra Marine Water Pump Kit 18-3380 – Johnson\/Evinrude 40–75HP\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-marine-water-pump-kit-18-3390-johnson-evinrude-85-300hp-v4-v6-cooling-system-rebuild\"\u003eSierra Marine Water Pump Kit 18-3390 – Johnson\/Evinrude 85–300HP V4\/V6\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eAlways confirm fitment against your engine service manual and full model\/year before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156142489636,"sku":"47-3002","price":37.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/92f76a91-5610-4939-bb3d-3ba58ef0d235.png?v=1785124914","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3002-johnson-evinrude-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}