Sierra 18-4563 Impellers & Parts The Sierra 18-4563 is a complete impeller kit designed specifically for Yamaha 70 horsepower outboard engines, covering model years 2021 through 2024. This comprehensive kit includes everything needed for a complete water pump impeller replacement, ensuring your engine's cooling system operates at peak efficiency. The impeller is the heart of your outboard's raw water cooling system, drawing water from outside the boat and circulating it through the engine to prevent overheating. Manufactured to meet or exceed OEM specifications, this Sierra impeller kit features a high-quality rubber impeller with precisely molded blades that create the pumping action necessary for proper water flow. The kit typically includes the impeller, gaskets, seals, and other components required for a complete service. Regular impeller replacement is one of the most critical maintenance tasks for outboard engines. Marine engine manufacturers typically recommend impeller replacement annually or every 100-200 hours of operation, whichever comes first. Impeller blades can become worn, cracked, or damaged from debris, dry running, or normal wear, leading to reduced water flow, overheating, and potentially catastrophic engine damage if not addressed promptly. Designed for Yamaha 70 HP engines from 2021-2024, this kit ensures proper fit and function for your specific engine model. The quality construction provides reliable performance and durability, giving you confidence that your engine's cooling system will function properly season after season. Regular impeller service is essential preventive maintenance that protects your investment and prevents costly repairs from overheating damage. Whether you're performing routine annual maintenance or replacing a failed impeller, this Sierra kit provides all the components needed for a professional-quality water pump service on your Yamaha outboard. Compatibility: Yamaha outboard engines: 70 HP Model years: 2021-2024 Complete kit with impeller and hardware Meets or exceeds OEM specifications High-quality rubber construction Essential for cooling system maintenance Interchange: Yamaha Outboard    6CJ-W0078-00-00Yamaha Outboard    6CJ-W0078-01-00 Normalized SKU: 184563UPC Code: 808282391683

Sierra 18-3017 Impellers & Parts Sierra's 18-3017 Impeller is designed for use with all #1, R, MR, Alpha Units (through s/n 0D494568), and raw water pump on 190 IB (s/n 1564539-1720903), 225 IB (s/n 1539620-2278646). It is interchangeable with Chrysler/Force/US Marine 47-803631T, 47-F694065, GLM 89840, Mallory 9-45306, Mercruiser Stern Drive 47-30221, 47-65960, 47-89984, 47-89984T4, Mercury Marine 47-30221, 47-65960, 47-85460, 47-89984, 47-899842, 47-899844 47-89984T3, 47-89984T4. Each Sierra product meets or exceeds the original equipment part it replaces. Designed for use with all #1, R, MR, Alpha Units (through s/n 0D494568), and raw water pump on 190 IB (s/n 1564539-1720903), 225 IB (s/n 1539620-2278646) Interchangeable with Chrysler/Force/US Marine 47-803631T, 47-F694065, GLM 89840, Mallory 9-45306, Mercruiser Stern Drive 47-30221, 47-65960, 47-89984, 47-89984T4, Mercury Marine 47-30221, 47-65960, 47-85460, 47-89984, 47-899842, 47-899844 47-89984T3, 47-89984T4 Includes one impeller per package Each Sierra product meets or exceeds the original equipment part it replaces OEM Interchange:CHRYSLER FORCE: 47-803631TCHRYSLER FORCE: 47-89984T4CHRYSLER FORCE: 47-F694065MERCURY MARINE: 47-30221MERCURY MARINE: 47-65960MERCURY MARINE: 47-89984MERCURY MARINE: 47-89984T4 Cooling: Impeller Normalized SKU: 183017UPC Code: 030999315045

Sierra 18-3003 Impellers & PartsImpeller fits OMC Johnson Evinrude 377178OEM Interchange:OMC: 377178OMC: 775519Cooling: ImpellerSierra Impeller #18-3003Normalized SKU: 183003UPC Code: 030999314994

Sierra 18-3102 Impellers & PartsImpeller PlateOEM Interchange:OMC: 305303Cooling: ImpellerSierra Impeller Plate #18-3102Normalized SKU: 183102UPC Code: 030999315410

Sierra 18-3103 Impellers & PartsImpeller PlateOEM Interchange:OMC: 303069Cooling: ImpellerSierra Impeller Plate #18-3103Normalized SKU: 183103UPC Code: 030999315427

Sierra 18-3107 Impellers & PartsImpeller PlateOEM Interchange:MERCURY MARINE: 32768MERCURY MARINE: 54705Cooling: ImpellerSierra Impeller Plate #18-3107Normalized SKU: 183107UPC Code: 030999315458

Sierra 18-3117 Impellers & PartsImpeller PlateOEM Interchange:MERCURY MARINE: 32435Cooling: Impeller PlateSierra Impeller Plate #18-3117Normalized SKU: 183117UPC Code: 808282258726

Sierra 18-3121 Impellers & PartsImpeller PlateOEM Interchange:OMC: 911703Cooling: Impeller PlateSierra Impeller Plate #18-3121Normalized SKU: 183121UPC Code: 030999315564

Sierra 18-3127 Impellers & PartsImpeller PlateOEM Interchange:OMC: 319275Cooling: Impeller PlateSierra Impeller Plate #18-3127Normalized SKU: 183127UPC Code: 030999753137

Sierra 18-3139 Impellers & PartsImpeller PlateOEM Interchange:MERCURY MARINE: 46895Cooling: Impeller PlateSierra Impeller Plate #18-3139Normalized SKU: 183139UPC Code: 030999315601

Sierra 18-3141 Impellers & PartsImpeller PlateOEM Interchange:OMC: 313176Cooling: Impeller PlateSierra Impeller Plate #18-3141Normalized SKU: 183141UPC Code: 030999315618

Sierra 18-3142 Impellers & PartsImpeller PlateOEM Interchange:YAMAHA: 68T-44323-00-00Cooling: Impeller PlateSierra Impeller Plate #18-3142Normalized SKU: 183142UPC Code: 808282200251

Sierra 18-3163 Impellers & PartsImpeller PlateOEM Interchange:YAMAHA: 6L5-44323-00-00Cooling: Impeller PlateSierra Impeller Plate #18-3163Normalized SKU: 183163UPC Code: 808282200220

Sierra 18-3182 Impellers & PartsImpeller PlateOEM Interchange:OMC: 317841Cooling: Impeller PlateSierra Impeller Plate #18-3182Normalized SKU: 183182UPC Code: 030999875396

Sierra 18-3186 Impellers & PartsImpeller PlateOEM Interchange:YAMAHA: 63D-44323-00-00Cooling: Impeller PlateSierra Impeller Plate #18-3186Normalized SKU: 183186UPC Code: 808282193980

Sierra 18-3188 Impellers & PartsImpeller PlateOEM Interchange:SUZUKI: 17471-98503Cooling: Impeller PlateSierra Impeller Plate #18-3188Normalized SKU: 183188UPC Code: 808282193997

Sierra 18-3189 Impellers & PartsImpeller PlateOEM Interchange:SUZUKI: 17471-87D01Cooling: Impeller PlateSierra Impeller Plate #18-3189Normalized SKU: 183189UPC Code: 808282194857

Sierra 18-3190 Impellers & PartsImpeller PlateOEM Interchange:SUZUKI: 17471-93902Cooling: Impeller PlateSierra Impeller Plate #18-3190Normalized SKU: 183190UPC Code: 808282185459