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post #16 of Old 04-20-2012
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Re: Rebuilding Yanmar 3GM30F; need advise $?

Originally Posted by LakeSuperiorGeezer View Post
If there was coolant in the engine after the 20 minutes even if it was boiling, then almost certain there was no damage. Was there any coolant after you let the engine get cold?

If the coolant was gone, and the head is made of aluminum, there will almost always be cracks. A machine shop that specializes in welding of engine heads should have a look at it. Test the head for cracks. Almost always these cracks can be repaired, but the welder has to know what he is doing.

Cast iron can take a lot of abuse. Probably no cracks if coolant was boiled out of it, but need to check the head for cracks. Harder to weld and sometimes a new head is needed, cannot be repaired. Was the paint burned off the head?
it is aluminium, but there was coolant left after the whole ordeal. I remain hopeful that the head is crack-free, but will get it checked out.

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