Join Date: Jan 2007
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yanmar 2GM low cooling water volume??
Started my new to me 25 year old 2GM (raw-water cooled) for the 1st time, and am concerned ablout the small amount of water coming out of the engine cooling system. With the intake hose in a bucket, there is barely a noticeable difference in the bucket water level, after running the engine for a minute. When I disconnect the hose to the exhaust elbow, water is coming out, but slowly. I disconnected the hose from the water pump, and seemed to have about the same amount - didn't want to run it long like that. Took the impeller out - looks fine. Belt / water pump are turning. As it is my 1st diesel, how much water should it use form a bucket in a minute or so??? It goes in the water soon, and I won't be able to see the exhaust, as it exits the boat, from a thru -hull, underneath the boat - not out the transom.
Forgot to mention - one of the 6 impeller cover screws broke / disinegrated when I put the cover back on, with a new paper gasket. Could that allow air in - reducing the pumps power?