{"product_id":"sierra-18-3090-johnson-evinrude-impeller","title":"Sierra 3090 Johnson\/Evinrude Impeller","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 3090 (18-3090) Impeller\u003c\/strong\u003e is a replacement water pump impeller for compatible Johnson, Evinrude, and OMC small-horsepower outboards. Installed inside the lower-unit water pump, its six flexible blades draw cooling water into the engine to maintain proper operating temperature. Replaces OEM numbers 387361 and 763735 and is specifically designed for applications using the later \u003cstrong\u003eplastic water pump housing\u003c\/strong\u003e.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight — Best Use\u003c\/h2\u003e\u003cp\u003eThe critical distinction with the 18-3090 is the plastic pump housing requirement. Matching by horsepower alone will lead to the wrong impeller — verify the OEM impeller number and confirm the plastic housing before opening the lower unit. This impeller fits a narrow band of small J\/E outboards (primarily 2–6 HP, mid-1970s to 1990), so always cross-reference the full model number, production year, and gearcase configuration before ordering.\u003c\/p\u003e\u003cp\u003eReplace every 2–3 seasons or 200 hours regardless of visible wear. Impeller vanes harden and lose flexibility before showing obvious damage, reducing cooling flow without warning.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra part number: 18-3090\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eDesigned for plastic water pump housings\u003c\/li\u003e\n\u003cli\u003eApproximate diameter: 1.52 in\u003c\/li\u003e\n\u003cli\u003eApproximate thickness: 0.72 in\u003c\/li\u003e\n\u003cli\u003eApproximate shaft bore: 0.44 in\u003c\/li\u003e\n\u003cli\u003eImpeller only — housing, plate, key, and seals not included\u003c\/li\u003e\n\u003cli\u003eUPC: 808282235000\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eConfirmed applications include compatible Johnson and Evinrude outboards:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2 HP models, approx. 1985–1990\u003c\/li\u003e\n\u003cli\u003e4 HP models, approx. 1976–1980 (90-degree gearcase)\u003c\/li\u003e\n\u003cli\u003e6 HP models, approx. 1979\u003c\/li\u003e\n\u003cli\u003eAdditional 1.2–6 HP applications using OEM impeller 387361 or 763735\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eExact fitment depends on model number, production year, gearcase, and water pump housing type. Do not order by horsepower alone.\u003c\/p\u003e\u003ch2\u003eFitment Verification Checklist\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eComplete outboard model number and production year\u003c\/li\u003e\n\u003cli\u003eGearcase configuration\u003c\/li\u003e\n\u003cli\u003ePlastic water pump housing confirmed\u003c\/li\u003e\n\u003cli\u003eOEM impeller number: 387361, 0387361, 763735, or 0763735\u003c\/li\u003e\n\u003cli\u003eImpeller dimensions and shaft\/drive-key configuration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAlternate Part Numbers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra: 18-3090 \/ 118-3090\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude\/OMC: 387361, 0387361, 763735, 0763735\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45210\u003c\/li\u003e\n\u003cli\u003eGLM: 89490\u003c\/li\u003e\n\u003cli\u003eCEF: 500358\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eThe lower unit must be removed to access the water pump. During service: inspect the 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 lubricant; rotate the driveshaft in its normal direction while seating the housing over the blades. Test for a strong cooling-water telltale before operating under load. Never run 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-3001-johnson-evinrude-impeller\"\u003eSierra 3001 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3002-johnson-evinrude-impeller\"\u003eSierra 3002 Johnson\/Evinrude Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3043-johnson-evinrude-impeller\"\u003eSierra 3043 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-3083-johnson-evinrude-impeller\"\u003eSierra 3083 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":51156142751780,"sku":"47-3090","price":46.39,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/bab7c4b2-b6f7-46f3-858e-ac0f867b5815.png?v=1785122042","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3090-johnson-evinrude-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}