817275A4 Water Pump Impeller Repair Kit for Mercruiser Alpha 1 GEN 2 D494569 Sterndrive Engine Cooling System Service Compatible with 46-847275A5 Replacement Sierra 18-3147 GLM Marine 12414

Water Pump Impeller Repair Kit - Fits Mercury MerCruiser Sterndrives Alpha 1 GEN 2 serial number D494569 + (and up)It helps support engine cooling and maintain water flow for your boat's performance on the water.Compatible for Mercury MerCruiser Sterndrives Motor Models(Verify your engine year and displacement):Fits Mercury MerCruiser Alpha 1 GEN 2 serial number D494569 + (and up)Feel free to share your engine serial number for compatibility confirmation.Replaces Part Numbers:Replaces Mercury Mercruiser Marine Sterndrive 817275A4, 817275A5, 817275K05Replaces Mercury Mercruiser Marine Sterndrive 817275Q4, 817275T4, 847275A5Replaces Mercury Mercruiser Marine Sterndrive 817275Q05 Replaces Mallory 9-48315Replaces GLM Marine 12414Replaces Sierra Marine 18-3147Package Include:1x Impeller（Replace Part #18-3056）2x Drain Screw Gasket（Replace Part #18-2945-9）2x Seal Ring（Replace Part #18-2944-9）1x Gasket, Impeller（Replace Part #18-2566-9）1x Impeller Key（Replace Part #18-3293）1x O-Ring（Replace Part #18-7420-9）1x Carrier Seal（Replace Part #18-2354）1x Face Seal and Tool（Replace Part #18-2599）1x Impeller Plate（Replace Part # 18-3122）2x Gasket1x Impeller Faceplate Replace Part #18-2564-1)please refer to the images for details.Key Features of Our Kit:Neoprene rubber impeller resists saltwater corrosion for pumping performance and service life.Drop-in design for DIY installation: ready in minutes with basic tools.Materials tested for heat resistance abrasion and operation in fresh or saltwater conditions.Why Regular Impeller Replacement MattersThe impeller draws in water to circulate through the engine for heat dissipation. Over time saltwater exposure debris dry running or wear can cause the rubber blades to crack deform or break off—reducing water flow and risking engine damage like warped cylinders or seized pistons. Marine sources suggest inspecting and replacing it every season or after 100 hours of use to help avoid repair costs and support performance.

• The Water Pump Impeller Repair Kit is designed for Mercury MerCruiser Sterndrives Alpha 1 GEN 2 serial number D494569 + (and up) motors. It helps keep the cooling system running smoothly during regular boating use
• The Outboard Impeller Kit for Mercury for MerCruiser Sterndrives 817275A4 817275A5 817275K05 is also compatible with Sierra 18-3147 GLM Marine 12414
• The Aftermarket Replacement Water Pump Repair Kit for Mercury for MerCruiser Sterndrive includes components: a rubber impeller, Key, Gaskets, Wear Plate and more
• The Water Pump Service Kit helps restore cooling performance by replacing worn parts that may cause overheating reduced water flow or water pump failure over time.
• The Marine Cooling System Impeller Repair Kit is recommended for seasonal or 100-hour maintenance and helps prevent unexpected cooling problems when operating in seawater shallow areas or waters with debris.