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. Step #2: Remove the thermostat housing and verify that nothing is stuck in the thermostat and preventing it from opening properly. 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. 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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