Should water from outboard be hot?

Your water flow should appear steady in most outboards. You also want the water coming out to be warm, but not excessively hot.

What temp should an outboard run at?

There are two common tstats – 140 degree and 160 degree. If you’re running normal you should see temps about 10 degrees above the tstat.

How hot should a Mercury outboard run?

NORMAL idle temps should fall in the 120-140 degree range. Most commonly right around 125-132.

How long can you run a boat motor out of water?

The maximum amount of time you can run your boat motor without water is between 2 and 10 seconds if you must.

What causes a boat motor to run hot?

Overheating can also be caused by a worn or damaged water pump impeller. … Any debris left in the water passages may reduce flow, which leads to persistent overheating. When a new impeller is installed, run the engine or related system as soon as possible to ensure proper operation, as I learned from experience.

How hot should a 4 stroke outboard get?

Should be fully open at 150 degrees F. Mine is right at 123-125 as well, but after WOT and back on idle my engines temp will creep up to as high as 130 until it cools it back down.

Why is my Mercury outboard overheating?

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 do you test an 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.