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post #11 of 15 Old 11-08-2006
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Cruisingdad said temp guage and I agree, but check out all of the electrical componants. That is obviously where the problem resides since the engine does not produce heat when it is not running. It could be as simple as a bad ground.

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post #12 of 15 Old 11-08-2006
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My overheating problem turned out to be not enough solution in the closed side of the cooling system. Make sure that everything is full! Check the tank after each brief running of the engine .
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post #13 of 15 Old 11-08-2006
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When the engine isn't running, is the ignition still on? If the ingine is off and the ignition is off, it isn't likely to be an electrical issue w/guage.

Who looks at the temperature guage when the engine is off anyway?
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post #14 of 15 Old 11-09-2006 Thread Starter
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Well thanks to all you guys for the info and suggestions.

Since I live in Ontario Canada and sail in the North Channel of Lake Huron, winter is upon us and the sailboat is on land. I will only be able to check the engine, gauge and wiring in the spring. At least I know that the over heating problem above the hull speed is nothing to lose sleep over. As for the engine over heating while sailing, it never made sense to me either. I'll have to get more info from the previous owner and get back to you. It may be the transmission he's talking about.
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post #15 of 15 Old 11-13-2006
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To clarify my prior post, I had a problem like yours with a Yanmar 2GM that has a closed cooling system. The previous owner had reported the overheating problem to the broker.

The problem was a failure to completely fill the closed side of the system with coolant. We ultimately had to add increments of coolant over a period of about 1 hour with a short run of the engine in between each shot.

My engine has a hot water heater in the circuit, and I think that is where most of the added coolant went.

I have run the engine up to rated output for extended periods since and there has been no overheating.

Last edited by Goodnewsboy; 11-13-2006 at 09:49 PM.
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