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Old 06-07-2009
noreault noreault is offline
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Yanmar raw water cooling problem

I have been having problems over the last several weeks with no flow in raw water. But has consistently clears quickly when running. Today it worked great on leaving the marina. After about an hour wind died and had to start it to move off lee shore when wind died. No water, but when I ran it up, water appeared and then ran dark black for a bit and cleared and ran well. I shut it down and after sailing for a few hours, on restarting no water.

The raw water intake is not plugged. I then removed the water pump. Water gets to the pump and the impeller looks in good shape. I am curious about the black flow of water

This is a new boat to me and does not yet have a raw water strainer. The engine is a Yanmar 2gm. The boat is 1976 Northern 29, but was repowered from Atomic to Yanmar, no idea when.


Any thoughs appreciated.

Last edited by noreault; 06-07-2009 at 09:56 AM.
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