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Captain Dave
Captain Dave, Marine Mechanic
Category: Boat
Satisfied Customers: 3847
Experience:  USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience
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how does a inboard motor boat overheat

Customer Question

how does a inboard motor boat overheat
Submitted: 8 years ago.
Category: Boat
Expert:  Captain Dave replied 8 years ago.
Hello. There are several things that could cause overheating, but the most likely is a failed water pump, which circulates sea or lake water through the motor to cool it and sends it out the exhaust. Another possibility is a faulty thermostat, or possibly a blockage of the cooling system. I'd bet on the water pump. If this is a boat that you can pull from the water, put a garden hose adapter (ear muffs) on it, start the motor, and see if water comes out the exhaust.