{"product_id":"sierra-18-3066-mercury-mariner-yamaha-impeller","title":"Sierra 18-3066 Mercury\/Mariner\/Yamaha Impeller","description":"\u003cp\u003eThe Sierra 18-3066 is a six-blade replacement lower-unit water pump impeller for select Mercury, Mariner and Yamaha outboards. It installs inside the gearcase water pump and circulates cooling water through the engine. The 47-3066 number is a distributor SKU for Sierra part 18-3066, which replaces Mercury\/Mariner 47-11590M and Yamaha 6G1-44352-00-00.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra manufacturer part number: 18-3066\u003c\/li\u003e\n\u003cli\u003eDistributor SKU: 47-3066\u003c\/li\u003e\n\u003cli\u003eSix flexible neoprene impeller blades\u003c\/li\u003e\n\u003cli\u003eApproximately 1-9\/16-inch outside diameter\u003c\/li\u003e\n\u003cli\u003eApproximately 11\/16- to 3\/4-inch depth\u003c\/li\u003e\n\u003cli\u003eApproximately 0.470-inch shaft bore\u003c\/li\u003e\n\u003cli\u003eDesigned for select Mercury, Mariner and Yamaha 6–8 HP outboards\u003c\/li\u003e\n\u003cli\u003eIncluded in Sierra water pump kit 18-3460\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315182\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDocumented Yamaha applications include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha 6 HP two-stroke: approximately 1986–2000\u003c\/li\u003e\n\u003cli\u003eYamaha 8 HP two-stroke: approximately 1984–2009\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDocumented Mercury and Mariner applications include select 6C, 6D and 8C two-stroke outboards using OEM impeller 47-11590M. Exact compatibility depends on the complete model, production year, serial number and gearcase configuration.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDo not select this impeller by horsepower alone. Mercury, Mariner and Yamaha used different water pump assemblies across similar small-outboard families.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete engine model and serial number\u003c\/li\u003e\n\u003cli\u003eProduction year\u003c\/li\u003e\n\u003cli\u003eGearcase and water pump assembly\u003c\/li\u003e\n\u003cli\u003eOriginal impeller number\u003c\/li\u003e\n\u003cli\u003eMercury\/Mariner reference 47-11590M\u003c\/li\u003e\n\u003cli\u003eYamaha reference 6G1-44352-00-00\u003c\/li\u003e\n\u003cli\u003eImpeller diameter, depth and shaft bore\u003c\/li\u003e\n\u003cli\u003eDrive-key configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe original water pump parts diagram provides the most reliable fitment confirmation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace the impeller if:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCooling-water discharge becomes weak or intermittent\u003c\/li\u003e\n\u003cli\u003eThe engine begins operating hotter than normal\u003c\/li\u003e\n\u003cli\u003eThe blades are cracked, torn, stiff or permanently bent\u003c\/li\u003e\n\u003cli\u003eRubber fragments are missing\u003c\/li\u003e\n\u003cli\u003eThe centre hub slips inside the impeller\u003c\/li\u003e\n\u003cli\u003eThe engine has been operated without cooling water\u003c\/li\u003e\n\u003cli\u003eThe motor has operated in sandy or silty conditions\u003c\/li\u003e\n\u003cli\u003eThe scheduled water pump service interval has been reached\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDry operation, sand and silt can quickly damage the flexible impeller blades and reduce cooling-water delivery.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eLower-unit removal is normally required to access the water pump assembly. During service:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect the ignition and battery where applicable\u003c\/li\u003e\n\u003cli\u003eFollow the correct shift-linkage and lower-unit removal procedure\u003c\/li\u003e\n\u003cli\u003eInspect the pump housing, cup, wear plate, key, seals and driveshaft\u003c\/li\u003e\n\u003cli\u003eRemove broken impeller fragments from the pump and cooling passages\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller with clean soapy water or an approved assembly lubricant\u003c\/li\u003e\n\u003cli\u003ePosition the drive key correctly\u003c\/li\u003e\n\u003cli\u003eRotate the driveshaft in its normal operating direction while lowering the housing over the blades\u003c\/li\u003e\n\u003cli\u003eReplace worn gaskets, O-rings and pump components\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit according to the engine service manual\u003c\/li\u003e\n\u003cli\u003eConfirm strong cooling-water flow before operating under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNever operate the outboard without an adequate cooling-water supply.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra: 18-3066\u003c\/li\u003e\n\u003cli\u003eDistributor SKU: 47-3066\u003c\/li\u003e\n\u003cli\u003eSierra catalogue reference: 118-3066\u003c\/li\u003e\n\u003cli\u003eMercury\/Mariner: 47-11590M\u003c\/li\u003e\n\u003cli\u003eMercury shortened reference: 11590M\u003c\/li\u003e\n\u003cli\u003eYamaha: 6G1-44352-00-00\u003c\/li\u003e\n\u003cli\u003eYamaha shortened reference: 6G1-44352-00\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89870\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45610\u003c\/li\u003e\n\u003cli\u003eCEF: 500302\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315182\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe 47-3066 number resembles a Mercury OEM number, but it is the distributor SKU for Sierra 18-3066. Match the engine's original impeller to Mercury 47-11590M or Yamaha 6G1-44352-00-00 rather than ordering from horsepower alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCompatible \u0026amp; Related Products\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOther impellers and water pump kits for small Mercury\/Mariner and Yamaha outboards available at Marisol Marine:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3067-mercury-mariner-yamaha-impeller\"\u003eSierra 18-3067 Mercury\/Mariner\/Yamaha Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3056-mercury-mariner-impeller\"\u003eSierra 3056 Mercury\/Mariner Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mercury-water-pump-repair-kit-821354a2\"\u003eMercury Water Pump Repair Kit 821354A2\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156142260260,"sku":"47-3066","price":48.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-3066.jpg?v=1784926902","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3066-mercury-mariner-yamaha-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}