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Is Your Boat's Engine Overheating? Find Out What's Causing It

Marine engine problems are not entirely inevitable. If you own a motorboat, you may have to deal with a few faulty issues down the line. Overheating is one of the problems many boat owners face. And it's no minor issue because it can cause boat fires. Therefore, knowing some of the common culprits behind marine engine overheating goes a long way in preventing serious damage to your engine or severe occurrences like boat fires. Generally, overheating marine engines have quite clear indicators that will help you know something is up. For instance, many boats have alarms and temperature gauges that will let you know your engine is running hot. Loss of power, hard starting and excessive steam from your exhaust are other indicators to watch out for. If you notice any of these symptoms, here are some of the components you need to check and fix.

Your Engine Thermostat 

Your marine engine's thermostat regulates the temperature at which it runs. Generally, thermostat valves stay shut when your engine is cold, allowing it to warm up. Once the engine heats up to the correct temperature, the thermostat valves will open to allow the coolant or cooling water to flow and cool the engine. If your thermostat is faulty, your engine is likely to run at extreme temperatures and overheat.

Your Water Pump and Impeller

Cooling system problems are other top causes of overheating in marine engines. For this, water pumps are typically the culprits behind the cooling issues. Generally, many boats, especially those with outboard motors, rely on water pumps that draw water from the river, lake or ocean to cool the engine. If the pump fails, the entire cooling process will be affected, causing overheating. Determining if you have a faulty water pump is usually easy. Water pumps have inlet and outlet water streams. If water from the outlet stream feels hotter to the touch than usual, chances are the pump is failing.

The impeller is a critical component of your water pump's assembly. It is a rotating propeller whose role is to draw the cooling water into your engine. Impellers are generally made of rubber, which can wear out over time. Worn or broken water pump impeller blades will struggle to draw the right amount of water needed to cool the engine.

Your Engine Drive Belt

The engine drive belt is the critical engine component that powers the water pump. Drive belts need to be tensioned to function properly. However, they can loosen over time or wear out, affecting their ability to power the water pump properly. 

For more information about boat engines, such as Volvo Penta marine engines, contact a supplier.