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Old 21-03-2016, 07:55   #16
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Join Date: Mar 2010
Location: Currently in Brunswick, GA
Boat: Bayfield 40
Posts: 138
Re: Yanmar Overheating

I had the same overheating issues and did everything mentioned above with no change. I finally replaced the heat exchanger and that did the trick (even though the HX had been serviced and pressure tested less than a year ago)._

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Old 21-03-2016, 15:49   #17
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Join Date: Oct 2010
Location: The boat - New Bern, NC, USA; Us - Kingsport, TN, USA
Boat: 1988 Pacific Seacraft 34
Posts: 309
Re: Yanmar Overheating

In my case with a different Yanmar engine (3HM35F) I have several times found that the root problem was a lack of sufficient raw water flow.

I hold a bucket under the exhaust and catch the water coming out over a 10 sec period. I compare it to the amount coming out at the same rpm measured in the past when the engine was not overheating. I can also compare it to the amount shown in the Yanmar service manual for a much faster engine rpm ratioed down to the 2000 rpm that I use.

In one case I had broken a couple of impeller blades one of which was lodged in the discharge of the water pump">raw water pump. In a second the pencil zinc that protects my refrigeration condenser had broken off and plugged the raw water hose. In a third case (not caught by this method) the mixing elbow was nearly plugged off with carbon and rust.

I talked about it on "the other forum" Overheating - SailNet Community

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Old 21-03-2016, 20:05   #18
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Join Date: Oct 2015
Location: Minnesota
Boat: Laser
Posts: 85
Re: Yanmar Overheating

Looks to me that the gauge is reading ten to fifteen deg higher than any part of the engine, check sender, gauge wiring.

Steven UK is offline   Reply With Quote

heating, overheating, yanmar

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