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Old 24-08-2011, 15:31   #1
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Yanmar Engine Overheating

Just joined and wonder if any member could advise me how to solve an engine overheating problem.
I have twin Yanmar 4JH2-HTE on board...the port engine overheat when reaching 2500 RPM (I usually run them both at 2900 witout any problem maintaining 150 F.)
Last year I have replaced the heat exchanger. Just cleaned the intake water filter system, replaced the salt water pump impeller, the engine fresh water thermostat...but still have the same problem.
Checked all hoses for obstruction as well as the salt water intake valve.
Any idea of what might cause this problem ?


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Old 24-08-2011, 17:24   #2
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Re: Yanmar Engine Overheating

Did you check your exhaust riser where the cooling water is injected into the exhaust system? It will often get plugged and cause over heating.
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Old 25-08-2011, 05:16   #3
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Re: Yanmar Engine Overheating

Greetings and welcome aboard the CF, Philippe.
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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