{"product_id":"sierra-18-3073-yamaha-mercury-mariner-impeller","title":"Sierra 3073 Yamaha\/Mercury\/Mariner Impeller","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 3073 (18-3073) Impeller\u003c\/strong\u003e is a replacement lower-unit water pump impeller for compatible Yamaha, Mercury, and Mariner 4–5 HP outboards. Six flexible blades rotate inside the pump housing to draw cooling water through the gearcase and circulate it through the engine. Replaces Yamaha 6E0-44352-00-00 and Mercury\/Mariner 47-96305M.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight — Best Use\u003c\/h2\u003e\u003cp\u003eNote that \u003cstrong\u003e47-3073 can resemble a Mercury OEM-format number\u003c\/strong\u003e but is the distributor SKU for Sierra 18-3073. This impeller covers both Yamaha and Mercury\/Mariner small-HP applications with different OEM cross-references — confirm the original impeller number from the engine parts diagram before removing the lower unit. For Yamaha, match to 6E0-44352-00-00; for Mercury\/Mariner, match to 47-96305M.\u003c\/p\u003e\u003cp\u003eReplace every 2–3 seasons or 200 hours regardless of visible wear. At only 9 grams, this is one of the smallest impellers in the Sierra J\/E and Yamaha range — easy to overlook during service, but critical for engine cooling on small portable outboards.\u003c\/p\u003e\u003cp\u003eThis impeller is included in Sierra water pump kits 18-3473 and 18-48619 for a complete pump service.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra part number: 18-3073\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eFits compatible Yamaha and Mercury\/Mariner 4–5 HP outboards\u003c\/li\u003e\n\u003cli\u003eIncluded in Sierra water pump kits 18-3473 and 18-48619\u003c\/li\u003e\n\u003cli\u003eImpeller only — housing, wear plate, key, and gaskets not included\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315250\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eDocumented applications:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eYamaha 4 HP two-stroke: approx. 1984–1999\u003c\/li\u003e\n\u003cli\u003eYamaha 5 HP two-stroke: approx. 1984–2002\u003c\/li\u003e\n\u003cli\u003eMariner 4A models with 6E0 serial code\u003c\/li\u003e\n\u003cli\u003eMariner 5C models with 6E3 serial code\u003c\/li\u003e\n\u003cli\u003eSelect Mercury and Mariner 4–6 HP outboards using OEM impeller 47-96305M\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAlways confirm by complete engine model number, production year, gearcase configuration, and OEM parts diagram. Do not order by horsepower alone.\u003c\/p\u003e\u003ch2\u003eAlternate Part Numbers\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSierra: 18-3073 \/ 118-3073\u003c\/li\u003e\n\u003cli\u003eYamaha: 6E0-44352-00-00 \/ 6E0-44352-00\u003c\/li\u003e\n\u003cli\u003eMercury\/Mariner: 47-96305M \/ 96305M\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45611\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89860\u003c\/li\u003e\n\u003cli\u003eAqua Power: 2172\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, 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\u003eRelated Yamaha\/Mercury 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-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\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-18-3090-johnson-evinrude-impeller\"\u003eSierra 3090 (18-3090) Johnson\/Evinrude Impeller\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":51156142555172,"sku":"47-3073","price":36.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-3073.jpg?v=1784926911","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3073-yamaha-mercury-mariner-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}