{"product_id":"sierra-18-3070-yamaha-impeller","title":"Sierra 3070 Yamaha Impeller","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 3070 (18-3070) Impeller\u003c\/strong\u003e is a six-blade replacement lower-unit water pump impeller for select Yamaha two-stroke outboards. It rotates inside the water pump housing to draw cooling water through the gearcase and circulate it through the engine. Replaces Yamaha OEM impeller 688-44352-03-00. Included in Sierra water pump kits 18-3370 and 18-3371.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight — Best Use\u003c\/h2\u003e\u003cp\u003eNote that \u003cstrong\u003e47-3070 can resemble a Mercury OEM impeller number\u003c\/strong\u003e but is the Land ‘N’ Sea distributor SKU for Sierra 18-3070. Confirm that the Yamaha water pump diagram calls for 688-44352-03-00 before ordering — especially on 60–90 HP engines where Yamaha used several different pump designs across model years. The 688-series impeller spans a wide range of two-stroke models (1984–2009), so production year and full model code are both required for a reliable match.\u003c\/p\u003e\u003cp\u003eReplace every 2–3 seasons or 200 hours regardless of visible wear. Sand, silt, dry operation, and extended storage can harden or damage the flexible blades, reducing cooling-water delivery before any visible external sign of failure.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra part number: 18-3070\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eFits select Yamaha two-stroke 60–90 HP outboards (1984–2009)\u003c\/li\u003e\n\u003cli\u003eIncluded in Sierra water pump kits 18-3370 and 18-3371\u003c\/li\u003e\n\u003cli\u003eImpeller only — housing, wear plate, key, and seals not included\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315229\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eDocumented Yamaha applications:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e60 HP: 2004–2005\u003c\/li\u003e\n\u003cli\u003e70 HP: 2004–2009\u003c\/li\u003e\n\u003cli\u003eC75: 1994–1999\u003c\/li\u003e\n\u003cli\u003eE75: 1995–2000\u003c\/li\u003e\n\u003cli\u003eP75: 1996–1999\u003c\/li\u003e\n\u003cli\u003eC80: 1997\u003c\/li\u003e\n\u003cli\u003eC85: 1991–1996\u003c\/li\u003e\n\u003cli\u003eCV85: 1989–1990\u003c\/li\u003e\n\u003cli\u003e90 HP: 1984–2009\u003c\/li\u003e\n\u003cli\u003e90 Jet: 1986–1989\u003c\/li\u003e\n\u003cli\u003eB90: 1997–1999\u003c\/li\u003e\n\u003cli\u003eC90: 1997–2001\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAlways confirm by complete engine model code, production year, serial number, and OEM water pump parts diagram showing 688-44352-03-00.\u003c\/p\u003e\u003ch2\u003eAlternate Part Numbers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra: 18-3070 \/ 118-3070\u003c\/li\u003e\n\u003cli\u003eYamaha: 688-44352-03-00 \/ 688-44352-03\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89920\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45603, 9-45603-10\u003c\/li\u003e\n\u003cli\u003eAqua Power: 2006\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, stainless cup, wear plate, key, 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-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-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\u003c\/ul\u003e\u003ch2\u003eRelated Yamaha Impellers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3071-yamaha-impeller\"\u003eSierra 3071 (18-3071) Yamaha Impeller – 115–250HP\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3042-yamaha-impeller\"\u003eSierra 3042 (18-3042) Yamaha Impeller – F75\/F80\/F90\/F100\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3074-yamaha-mercury-mariner-impeller\"\u003eSierra 3074 (18-3074) Yamaha\/Mercury\/Mariner Impeller – 9.9–15HP\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3073-yamaha-mercury-mariner-impeller\"\u003eSierra 3073 (18-3073) Yamaha\/Mercury\/Mariner Impeller – 4–5HP\u003c\/a\u003e\u003c\/li\u003e\n\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\n\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":51156142456868,"sku":"47-3070","price":51.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-3070.jpg?v=1784926908","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3070-yamaha-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}