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yanmar 20gm cooling system?

water flow coming out of engine reduced.checked impeller seems correct. water intake clear.what else can i check.
nigel, March 2009
The cooler exchanger might be blocked. It is possible to remove the exchanger and clean it but you will need to replace a few seals. I suggest to check it the water from the exhaust is hot or luke warm. If luke warm you could leave it for a while.

Paul, April 2009
link Click here to see other fixes for Yanmar 20GM.