How do I test my outboard thermostat?

Published by Charlie Davidson on

How do I test my outboard thermostat?

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.

What temp should outboard thermostat open?

A thermostat is designed to hold the cooling water in the block until it reaches the temperature set by the engine manufacturer. Generally, this is between 50 and 60 degrees Celsius. It then opens to release the water before it gets too hot and overheats the outboard.

Can you run a outboard motor without a 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 engine 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.

What happens when you run an engine without a thermostat?

A car without a thermostat would never even warm to operating temperature, much less overheat. The lack of a thermostat would create a constant flow of coolant through the engine, thus a constant cooling effect on the engine.

Does an outboard motor have a thermostat?

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 to diagnose a bad outboard thermostat?

1 Step 1: Remove the thermostat from the motor. NOTE: Some outboards such as Yamaha V MAX models have two thermostats, in… 2 Step 2: Put the thermostat in a bowl and immerse it in boiling water. As the thermostat heats up, it should open. When… More

Where is the thermostat on an Evinrude Outboard?

Unbolt the thermostat housing located at the top of the cylinder head or exhaust plate (Note: for older V4 Evinrude/Johnson outboards this will be located at the bottom of the exhaust plate between the cylinder heads) 2. Remove the thermostat and place in a clear jar

What kind of thermostat do I need for my outboard engine?

Thermostats are manufactured in various shapes and sizes for different outboard engines. At we’ve made it easy to find the right parts for your outboard engine. Simply select your outboard’s brand, year, HP and model, and browse hundreds of OEM replacement parts, including thermostats.

Can you test the thermostat with a water probe?

So, if you have a temperature probe or thermometer you can wait until the water reaches say 65 degrees Celsius and then pour it on the thermostat to test. But, for the purpose of simply checking whether the thermostat is operational, the above method will work fine. To shop our range of thermostats, click here.

Categories: Contributing