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Old 31-05-2012, 03:29   #1
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Join Date: Sep 2010
Location: Bedford UK
Boat: Jeanneau, 45.2 Formidable
Posts: 7
Yanmar Using Cooling Water

Had small loss of coolant from my Yanmar 4JH3-TE for years. Not a big problem, the antifreeze lost just makes a mess on and under the engine.
Now have re positioned the header tank. Previously mounted on a bracket bolted directly to the engine. Now, using the same bracket, just turned around, mounted on the side wall near the engine. Problem solved.

I think that the water in the header tank was atomising at certain engine vibrations and exiting via the header tank overflow. It was not obvious where the coolant loss was coming from.

Whatever, this seems like a 100% cure and all you need is a suitable fixing bolt. Recommend this if your header tank giving a water loss problem.

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Old 31-05-2012, 05:10   #2
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Join Date: Nov 2006
Location: Maine and California
Boat: Tartan 37 "Velera"
Posts: 338
Re: Yanmar Using Cooling Water

I have a similar problem that I cannot figure out. My overflow tank is mounted off the engine, but there is still a leak. Small and just annoying, but I cannot seem to stop it. I have tightened everything.
Ray Durkee
S/V Velera
Tartan 37
Castine, Maine
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engine cooling water, water, yanmar

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