Brands sold at West Marine include Jabsco, Johnson Pump, Sierra and others. For more information on this, see the West Advisor article Impeller Replacement 101. The dimensions you need to know are the number of blades, the width of the blades, the overall impeller diameter, the shaft diameter and the drive type. You can shop for a marine pump impeller by using our online Sierra Engine Parts Finder or by selecting one according to the dimensions of the one you want to replace. Not replacing an impeller can result in serious consequences, as is the case with engine water pump impellers which, when they go kaput, can result in engine overheating and costly damage. Back Next Generation Gen 2 DTS Controls DTS Rigging Kits 2007 and Up DTS Engine to Command Module Harnesses 14 Pin Instruments, Gauges & VesselView. The best way to extend the life of your flexible impeller is to never run a pump dry. DTS Sterndrive, Inboard & Outboard Controls. Because impellers wear out over time, they must be periodically replaced. Examples include engine belt-driven water pumps, engine raw water pumps, outboard motor water pumps, ballast pumps for wake board boats and many other applications. Most boats have one or more flexible impeller pumps that require periodic replacement. Buy Marine Inboard/Outboard Cooling Impeller MERCRUISER Water Pump WSM 18-3087 OEM 47-59362: Gaskets - FREE DELIVERY possible on eligible. On Bravo models this could be a non-sealing pump housing or loose connections on the inelt water hose.Boat Impellers for Every Application on Your Boat On Mercruiser Alpha models this could be an imporperly sealed pump housing in the sterndrive that draws air once the boat is up and running on plane. Step #5: Make sure that there are no leaks on the inlet side of the water pump that would allow the pump to draw air and therefore cavitate. This could be from loose hose clamps, bad sealing, etc. If your engine is equipped with an oil, power steering, fuel or engine cooler these will most likely be the areas for debris to become trapped. You should remove the hoses from the thermostat housing to the supply pump outlet as well as the pump inlet hose and backflush all the way out of the sterndrive to ensure there are not any restrictions. After all, it's the lifeblood of your boat's engine. Because of this, it's important to keep your inboard motor cooling system maintained and updated. It also ensures that it's operating at its best and at peak efficiency. Common causes of restriction are grass, weeds, and the remains from previous water pump impellers that come apart resulting from overheating. An inboard engine cooling system works by keeping your boat's engine from overheating. Step #4: Verify there are no restrictions to the water flow going to the engine. If you are replacing the impeller due to overheat issues versus routine maintenance, go ahead and replace the pump body as well. It is important to realize that even with a new impeller just a small amount of “scoring” to the pump body can effect the output flow of the pump significantly. Impellers should be replaced every other year. Step #3: Replace the Sea Water Pump Impeller (Watch “How To” Video) ![]() Although thermostats can fail this is normally NOT the cause of most overheat related problems. This could lead to it sucking in air when the boat is running causing an. Step #2: Remove the thermostat housing and verify that nothing is stuck in the thermostat and preventing it from opening properly. Water Pump Impeller for Volvo, PCM, Crusader For Use On GM Engines With V-belts. However, the rubber impeller wears and degrades requiring regular replacement. You can shoot the temperature of the thermostat housing which should tell you whether the temperature that the gauge on the dash is reading is accurate or not. In our opinion no boater should be without an IR-Thermometer on board the boat at all times. Bad gauges are one of the most common causes of problems. Step #1: Verify that the temperature gauge is reading accurately. MerCruiser Diagrams: See various part diagrams for Alpha Sterndrive models with water pump impeller located in the lower unit as well as the Bravo Sterndive models where the Sea Water Pump Impeller is mounted within the engine mounted Sea Water pump. When inserting an impeller, be sure to use durable water proof grease or other lubricating agent suitable for the purpose and approved by the pump manufacturer. This article will break down the most common problems and associated fixes. Response: Marine engine overheating can result from a number of different causes. What can I check to try and isolate the problem? ![]() Question #1: My Marine Engine is overheating. Topic: Marine Water Pumps & Engine Cooling System Overheat Diagnosis
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