{"product_id":"sierra-18-3068-yamaha-impeller","title":"Sierra 18-3068 Yamaha Impeller","description":"\u003cp\u003eThe Sierra 18-3068 is a six-blade replacement lower-unit water pump impeller for select Yamaha outboards. It installs inside the gearcase water pump and draws cooling water through the lower unit for circulation through the engine. The 47-3068 number is the Land 'N' Sea distributor SKU for Sierra part 18-3068. It replaces Yamaha impeller numbers 6H4-44352-00-00, 6H4-44352-01-00 and 6H4-44352-02-00.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra manufacturer part number: 18-3068\u003c\/li\u003e\n\u003cli\u003eDistributor SKU: 47-3068\u003c\/li\u003e\n\u003cli\u003eSix flexible impeller blades\u003c\/li\u003e\n\u003cli\u003eDesigned for select Yamaha outboards\u003c\/li\u003e\n\u003cli\u003eReplaces Yamaha 6H4-44352-00-00, 6H4-44352-01-00 and 6H4-44352-02-00\u003c\/li\u003e\n\u003cli\u003eUsed in Sierra water pump kits 18-3408, 18-3413, 18-3429, 18-3430, 18-3432, 18-3440 and 18-3490\u003c\/li\u003e\n\u003cli\u003eImpeller only; housing, wear plate, key, seals and gaskets are not included unless separately specified\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315205\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe strongest documented fitment is for select Yamaha 30, 40 and 50 HP outboards using an original 6H4-series water pump impeller. Additional catalogue references associate the impeller with certain Yamaha two-stroke and four-stroke applications from approximately 25 through 60 HP, but exact fitment depends on the engine model, year 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. Yamaha used more than one water pump configuration across engines carrying similar horsepower ratings.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete Yamaha engine model number\u003c\/li\u003e\n\u003cli\u003eProduction year and serial number\u003c\/li\u003e\n\u003cli\u003eGearcase and water pump assembly\u003c\/li\u003e\n\u003cli\u003eOriginal impeller number\u003c\/li\u003e\n\u003cli\u003eYamaha reference 6H4-44352-00-00, 6H4-44352-01-00 or 6H4-44352-02-00\u003c\/li\u003e\n\u003cli\u003eImpeller bore and drive-key arrangement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe original Yamaha water pump 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 running hotter than normal\u003c\/li\u003e\n\u003cli\u003eAn overheat warning activates\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 regularly in sandy or silty water\u003c\/li\u003e\n\u003cli\u003eThe scheduled water pump service interval has been reached\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA worn impeller may still rotate while no longer moving enough water to cool the engine safely.\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 lower-unit and shift-linkage removal procedure\u003c\/li\u003e\n\u003cli\u003eInspect the pump housing, stainless 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 Yamaha 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: 18-3068\u003c\/li\u003e\n\u003cli\u003eLand 'N' Sea distributor SKU: 47-3068\u003c\/li\u003e\n\u003cli\u003eSierra catalogue reference: 118-3068\u003c\/li\u003e\n\u003cli\u003eYamaha: 6H4-44352-00-00\u003c\/li\u003e\n\u003cli\u003eYamaha: 6H4-44352-01-00\u003c\/li\u003e\n\u003cli\u003eYamaha: 6H4-44352-02-00\u003c\/li\u003e\n\u003cli\u003eGLM Marine: 89900\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45601\u003c\/li\u003e\n\u003cli\u003eMallory Marine: 9-45601-10\u003c\/li\u003e\n\u003cli\u003eAqua Power: 2009\u003c\/li\u003e\n\u003cli\u003eUPC: 030999315205\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe 47-3068 number is a distributor stock number, not the Yamaha OEM number. Confirm that the engine's water pump diagram calls for one of the 6H4-44352 impeller numbers before ordering, particularly on 30–60 HP Yamaha outboards where several gearcase and pump configurations may be encountered.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCompatible \u0026amp; Related Products\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOther Sierra Yamaha impellers and water pump kits available at Marisol Marine:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-3069-yamaha-mercury-mariner-impeller\"\u003eSierra 18-3069 Yamaha\/Mercury\/Mariner Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3070-yamaha-impeller\"\u003eSierra 3070 Yamaha Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3071-yamaha-impeller\"\u003eSierra 3071 Yamaha Impeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-3042-yamaha-impeller\"\u003eSierra 3042 Yamaha Impeller\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\/quicksilver-8m6012796-impeller-repair-kit-yamaha-40-60hp\"\u003eQuicksilver 8M6012796 Impeller Repair Kit – Yamaha 40–60hp\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156142325796,"sku":"47-3068","price":47.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-3068.jpg?v=1784926904","url":"https:\/\/marisolmarine.com\/products\/sierra-18-3068-yamaha-impeller","provider":"Marisol Marine Company","version":"1.0","type":"link"}