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Can You Run a Mercruiser Without a Thermostat?

FAQs Jackson Bowman August 7, 2022

Yes, you can temporarily run your outboard without a thermostat without damaging the motor. No, you cannot remove the thermostat and keep the engine running for a long time without damaging the engine.

Can I run my 5.7 MerCruiser without a thermostat?

New member. I’ve run petrol engines without a thermostat. You have identified the problem of a slower warm-up period. As long as the engine finally gets up to temperature and you take it easy (otherwise the thicker oil could mean insufficient lubrication) I see no other problem.

What happens when you run an engine without a thermostat?

The motor goes into closed loop control when the motor has exceeded a certain temperature. If the temperature does not rise, the engine will clog and stop completely. This depends on how old the car is, but if you drive without a thermostat, the car will use more fuel.

What happens when a boat thermostat is stuck open?

In other words, if a thermostat fails in the open position, water will continuously flow through the engine and the engine will run too cold. In this case, condensation forms in the engine as hot engine oil comes into contact with cold engine surfaces.

What does a boat thermostat do?

The thermostat prevents the cooling water from reaching the cylinder walls until there is enough heat for efficient combustion. Once cylinder temperature is reached, the thermostat allows cooling water to flow from the water pump through the water jacket and out the exhaust.

What will happen if thermostat is removed?

TOM: But removing the thermostat can do quite a bit of damage on a modern car. Most cars now have computers constantly monitoring engine temperature and adjusting things accordingly. When the computer thinks the engine is cold – and it will be cold without a thermostat – the fuel mixture is enriched.

Will an engine overheat without a thermostat?

Operating an engine without a thermostat can cause the engine to overheat because the coolant flows through the engine too quickly and the coolant cannot absorb the engine’s heat.

Can I remove my thermostat?

Removing the thermostat just makes the engine too cold. This is bad. It increases fuel economy as the engine CTS (Coolant Temperature Sensor) assumes the engine has not reached normal operating temperature and simply injects more fuel.

What are the symptoms of a failing thermostat?

Is it OK to run outboard without thermostat?

Yes, you can temporarily run your outboard without a thermostat without damaging the motor. No, you cannot remove the thermostat and keep the engine running for a long time without damaging the engine.

What causes a thermostat to stick open?

The most obvious cause is a blocked radiator, low water level, or a failed fan. There are more complicated reasons including a failed/failing water pump, an internal obstruction in the radiator, or the engine itself.

Can you put a car thermostat in a boat?

If antifreeze is used (closed cooling system), use an automotive thermostat with the correct opening temperature. If you have a raw water cooled engine, go for the marine thermostat. Materials can vary (stainless steel vs coated steel spring, etc.) to withstand the corrosive effects of salt or fresh water.

How does a thermostat work on a boat motor?

The thermostat prevents the cooling water from reaching the cylinder walls until there is enough heat for efficient combustion. Once cylinder temperature is reached, the thermostat allows cooling water to flow from the water pump through the water jacket and out the exhaust.

Do inboard boats have thermostats?

Most marine inboard engines are fresh water cooled. Similar to your car, a trapped quantity of fresh water (coolant) is continuously circulated through a heat exchanger that keeps the engine at a thermostat-set temperature. Usually this is between 170 and 180 degrees.

References:

  1. https://forums.ybw.com/index.php?threads/can-i-run-my-engine-without-a-thermostat-mercruiser.100980/
  2. https://naijauto.com/car-maintenance/drive-a-car-without-the-thermostat-1570
  3. https://www.boats.net/blog/diagnosing-bad-outboard-thermostat
  4. http://www.ankn.uaf.edu/publications/vs/cooling.html
  5. https://www.cartalk.com/content/you-should-never-ever-remove-thermostat
  6. https://www.yourmechanic.com/question/no-thermostat-new-water-pump-still-overheating-by-jessica-w
  7. https://www.mrparts.ng/blogs/newsfeeds/why-you-should-never-remove-your-thermostat
  8. https://www.idolz.com/en/2022/02/21/5-thermostat-failure-symptoms-and-how-to-avoid-them/
  9. https://www.bornagainboating.com/outboards-without-thermostats/
  10. https://homex.com/ask/what-causes-thermostat-to-stick
  11. https://www.thehulltruth.com/boating-forum/15591-thermostat.html
  12. http://ankn.uaf.edu/publications/vs/cooling.html
  13. https://harborsailboats.com/7500-2/

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