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Hunter 33.1
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37 Posts
I've been reading that lots of ppl has temperature reading for their cooling water out from engine. This interest me. I've Yanmar 2GM20F. Anyone has photos of the setup ?
I have a 2GM20 which I installed myself in 1995. I have had overheating problems twice and both involved the exhaust elbow. I have a brass elbow which connects the water discharge line into the exhaust elbow once it was blocked with carbon the second time it was blocked by scale in the exhaust elbow. A long skinny screw driver cleared the debris both times. I now check the elbow each season. The engine normally runs below 180.
 

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Hunter 33.1
Joined
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37 Posts
Since the temp is only 122 with the thermostat out, the problem has to be in ther in some fashion. I have not been pleased with the replaced sold by Universal/Westerbeke. They don't last and do a lousy job of maintaining the correct temp. And the price has risen four-fold in the last 10 years!
Doodles I agree with JimCAL, it would seem to be a thermostat problem, do you have the manual which shows the cooling water circuit on both sides of the heat exchanger? Examine the area where the thermostat is installed and be sure it is not blocking a port, could be the wrong thermostat which seems almost impossible. Also check the gasket and be sure it is not blocking a port. It is not adding up.
 
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