Question: How To Replace Thermostat In Mercury Outboard Motors?

Where is the thermostat located on a Mercury outboard?

Press down on the top cover lock. Lift the top cover up, forward and away from the motor. Make the boat safe to work on by removing the battery cables from the battery. Locate the thermostat cover on the top of each cylinder head; it’s a small oval-shaped cover, secured by two bolts.

How do I know if my outboard thermostat is bad?

Symptoms of a failed thermostat (open position)

  1. Engine slow to warm up.
  2. Engine not reaching its correct operating temperature.
  3. Poor cold weather performance.
  4. Water flowing from the exhaust pipe at idle.

Can I run my Mercury outboard without a thermostat?

Can I Run My Outboard Without The Thermostat? Yes, you can temporarily run your outboard without the thermostat and not harm the engine. No, you can not remove the thermostat and continue running the engine for long periods of time without causing harm to the engine.

Does an outboard motor have a thermostat?

One of the least appreciated components of an outboard motor is the lowly thermostat. That is made possible by having the proper engine temperatures and fuel mixtures. The brain of a thermostat is a component called a vernatherm that is fastened inside the thermostat housing.

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How do you check a thermostat on an outboard motor?

Step 2: Put the thermostat in a bowl and immerse it in boiling water. As the thermostat heats up, it should open. When you remove it from the boiling water, allow it to cool and it should close again. If the thermostat remains open or closed, it has failed and must be replaced.

How often should you replace outboard thermostat?

Typically, water pumps and thermostats should be serviced every two to three years. This varies on where you do most of your boating.

What are signs of a bad thermostat?

Symptoms of a Failing Car Thermostat

  • The temperature gauge reads high and the engine overheats.
  • The temperature changes erratically.
  • The vehicle’s coolant leaks around the thermostat or under the vehicle.

What causes an outboard motor to overheat?

The most common cause of outboard motor overheating is water pump failure. Lack of fresh water can be noted if there is a large increase in temperature between the inlet and and outlet of the heat exchanger. Water pump failure can also be caused by a defective heat exchanger, though this is harder to check.

How long does it take for water to come out of outboard motor?

Built-In Flush Connection If the boat is kept at a dock this type of flush connection usually can be used to flush the motor when it its tilted clear of the water. After connecting the hose to the motor, let the water run for about 10 minutes or as instructed in the owner’s manual.

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How much water should be coming out of outboard?

Re: how much water The thermostat will not open till the motor reaches around 140+degs. and water should come out the pee hole then as the stats open up. There should be an exhust/water port on the midsection back side that should have water spiting out of them at idle and till the stats open up.

Is it bad to remove thermostat?

TOM: Yes, Lee, removing the thermostat does make the car run cooler. But you should never, ever do it. When the engine is too cool, the thermostat closes and stops the coolant from flowing through the radiator, so the engine heats back up.

Can I run a diesel engine without a thermostat?

Motorsport Diesel You can run without a thermostat, if you restrict the flow of coolant. The closer the engine temp runs to 210, the more power it will produce, with less fuel consumption. The engine will also create less internal wear at this temperature.

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