{"product_id":"sierra-18-3042-yamaha-impeller","title":"Sierra 3042 Yamaha Impeller","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 3042 (18-3042) Impeller\u003c\/strong\u003e is a replacement lower-unit water pump impeller for compatible Yamaha 75–100 HP four-stroke outboards. Six flexible blades draw cooling water through the gearcase and circulate it through the engine. Replaces Yamaha OEM part number 67F-44352-00-00.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight — Best Use\u003c\/h2\u003e\u003cp\u003eNote that \u003cstrong\u003e47-3042 is the distributor SKU\u003c\/strong\u003e, not a Yamaha OEM-format number. When cross-referencing, match to Yamaha 67F-44352-00-00 and verify against the exact engine model and production year before opening the lower unit. Yamaha used different gearcase and water pump configurations within the same horsepower ranges, so HP alone is not a reliable selector.\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\u003cp\u003eThis impeller is included in Sierra water pump kits 18-3451 and 18-3409 for a complete pump service.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra part number: 18-3042\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eFits compatible Yamaha F75, F80, F90, F100 four-stroke outboards\u003c\/li\u003e\n\u003cli\u003eImpeller only — housing, plate, key, and seals not included\u003c\/li\u003e\n\u003cli\u003eUPC: 808282256852\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eDocumented Yamaha applications:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eF75: 2003–2005\u003c\/li\u003e\n\u003cli\u003eF80: 1999–2003\u003c\/li\u003e\n\u003cli\u003eF80 Jet Drive: 2001–2002\u003c\/li\u003e\n\u003cli\u003eF90: 2003–2005\u003c\/li\u003e\n\u003cli\u003eF90 Jet Drive: 2003–2004\u003c\/li\u003e\n\u003cli\u003eF100: 1999–2002\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAlways verify by full engine model number, production year, shaft length, gearcase configuration, and OEM parts diagram showing Yamaha 67F-44352-00-00.\u003c\/p\u003e\u003ch2\u003eAlternate Part Numbers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra: 18-3042 \/ 118-3042\u003c\/li\u003e\n\u003cli\u003eYamaha: 67F-44352-00-00 \/ 67F-44352-00\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45612\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eLower-unit removal is required to access the water pump assembly. During service: inspect the pump housing, wear plate, key, cup, and seals; 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\u003eCompatible Yamaha Water Pump Kits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3433-yamaha-water-pump-repair-kit\"\u003eSierra 3433 Yamaha Water Pump Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3434-yamaha-water-pump-repair-kit\"\u003eSierra 3434 Yamaha Water Pump Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3442-yamaha-water-pump-repair-kit\"\u003eSierra 3442 Yamaha Water Pump Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3371-yamaha-water-pump-repair-kit\"\u003eSierra 3371 Yamaha Water Pump Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3312-yamaha-water-pump-repair-kit\"\u003eSierra 3312 Yamaha Water Pump Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-33131-yamaha-water-pump-repair-kit\"\u003eSierra 33131 Yamaha Water Pump Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRelated Yamaha Impellers\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/products\/sierra-impeller-18-3086-ap-007-yamaha-outboard-water-pump-replacement\"\u003eSierra Impeller 18-3086 – Yamaha Outboard Water Pump Replacement\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eAlways confirm fitment against your Yamaha service manual and full model\/year before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156142686244,"sku":"47-3042","price":61.69,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-3042.jpg?v=1784926915","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3042-yamaha-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}