{"product_id":"sierra-18-3071-yamaha-impeller","title":"Sierra 3071 Yamaha Impeller","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 3071 (18-3071) Impeller\u003c\/strong\u003e is a six-blade replacement lower-unit water pump impeller for compatible Yamaha 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 numbers 6E5-44352-00-00 and 6E5-44352-01-00.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight — Best Use\u003c\/h2\u003e\u003cp\u003eNote that \u003cstrong\u003e47-3071 can resemble a Mercury-style OEM number\u003c\/strong\u003e but is the distributor SKU for Sierra 18-3071. The primary OEM cross-reference is Yamaha 6E5-44352-00-00 or 6E5-44352-01-00 — confirm that number in the engine parts diagram before removing the lower unit. Yamaha used the 6E5-series impeller across multiple high-HP engine families and years (115–250 HP, including F225, LF225 3.3L, and VF225 SHO 4.2L), so model number and production year verification is essential.\u003c\/p\u003e\u003cp\u003eReplace every 2–3 seasons or 200 hours regardless of visible wear. At 156 grams, this is one of the larger impellers in the Sierra Yamaha range — sized for high-volume cooling demands on big four-stroke outboards.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra part number: 18-3071\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eFits compatible Yamaha 115–250 HP outboards (including F225, LF225 3.3L, VF225 SHO 4.2L)\u003c\/li\u003e\n\u003cli\u003eImpeller only — housing, wear plate, key, seals, and gaskets not included\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315236\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eDocumented applications include compatible Yamaha outboards using OEM impeller 6E5-44352-00-00 or 6E5-44352-01-00:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e115 HP applications\u003c\/li\u003e\n\u003cli\u003e150 HP applications\u003c\/li\u003e\n\u003cli\u003e175 HP applications\u003c\/li\u003e\n\u003cli\u003e200 HP applications\u003c\/li\u003e\n\u003cli\u003e250 HP applications\u003c\/li\u003e\n\u003cli\u003eF225, LF225 3.3L, and VF225 SHO 4.2L models\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAlways confirm by complete engine model number, production year, serial number, gearcase configuration, and OEM water pump parts diagram. Do not order by horsepower alone.\u003c\/p\u003e\u003ch2\u003eAlternate Part Numbers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra: 18-3071 \/ 118-3071\u003c\/li\u003e\n\u003cli\u003eYamaha: 6E5-44352-00-00, 6E5-44352-01-00\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89930\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45609, 9-45609-10\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eLower-unit removal is required to access the water pump assembly. During service: inspect the pump housing, stainless cup, wear plate, key, seals, and driveshaft; remove any broken impeller fragments from the pump and 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\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":51156142522404,"sku":"47-3071","price":47.09,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/36055a01-0417-4fb2-beed-107ec7265465.png?v=1785124754","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3071-yamaha-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}