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Old 04-01-2009
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Scanning through the entries, I can't find where anyone did this:

Start the engine cold. Leave the filler cap off the cooling system.

Rev it up just a little and watch for bubbles coming up through the coolant. There should be none. If there are bubbles coming up through the coolant that is an indication of a cracked cylinder head, blown gasket, or maybe even a crack in the cylinder walls.

What happens is, the engine is pushing hot gas into the cooling system. Under no-load conditions the engine can handle it fairly well, but when things start happening rapidly and lots of hot gas gets mixed with coolant, well, you know.
When you come to a "Y" in the road, take it....Yogi Berra
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Old 04-25-2011
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I use to own "Ranger" in the keys from 1990 to 1994, a Colvin design and built, 43' coreten stell hull with a gaff rigged main and a marconi misen.
I also experienced over heating problem and find out that the brass fitting going to the muffler was gloged by black residue and restricted the output of cooling raw water. from the helm it seems that it is pumping, but the flow is not fully released and after 15min the alarm ring.
let me know if that help.
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