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Old 08-29-2011
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Yanmar 3YM30

Recently while motoring we had a belt break on the engine. I didn't realize that it had broken for a minute or two, and the engine had overheated. I shut her down and replaced the best. She started right up and sounded great. I thought I had made it through a potential catastrophe.

Now it seems that, after filling her with water to test her, the engine almost immediately blows the top off the overflow tank. I can run it from cold, for about 10 seconds, and pressure builds up in the overflow and the top pops off. The overflow will slowly fill and I have to shut it down. I noticed that if I have the radiator cap off, water fill spray out of the opening when I crank the engine.

Anyone seen this before? The engine is practically new with around 180 hours on it. Could it be that the water in the engine is almost immediately boiling and building too much pressure?
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1969 Crealock/Columbia 36 Sloop completely refitted in 2000 and new Yanmar in 2006.
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