Function of thermostat on Yanmar 1GM

[cjrs472]

Hi
Could someone tell me if is it good to remove the Yanmar 1GM's thermostat to stop overheating???
Thanks

[Frenchy]

No, it's not a good idea to remove it. You can test it by putting it in a pot of water on the stove and bringing the water
to a boil. The thermostat should open. If not, replace. Other things you can check: The raw water pump impeller,
air leaks at the raw water strainer or hose connections and of course obstructions in the mixing elbow, a common trouble spot.
On my old Cal 27 with the GM-1, I found a stainless steel mixing elbow - much better than the original, which usually
rusted up after only a few years. Good luck tracing this down. - Jean

[steveg]

Hi,

This is not intended to sound ignorant, but how did you determine the engine was overheating? Did you feel it with your hand to be sure it was really hot. Did you use an infrared thermometer, at least I think that is what it is called.

Assuming it was in fact overheating, you should check a couple of things. First make sure there is water coming into the water pump from the hose to the seacock. Next, as has been suggested, check the impeller. Not sure how to check the mixing elbow. I removed mine and it was fine, but having it off and a new one in hand changed it anyway.

I agree there is no reason to remove the thermostat, unless it needs to be replaced.

There are many on this board with much superior mechanical knowledge than mine, and they may chime in as well.