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Inspected the muffler when I had the exhaust hose off. Totally clear inside. No muskrats. We did have exhaust coming out of the one way flapper at the stern before the incident. Will have the diver peek in there tomorrow.

Right now I can only guess that there may have been an obstruction at the intake like seaweed or plastic? And I can only assume that the antifreeze coolant in the closed half of the cooling system kept the engine cool. I idled back to the harbor slip (under a mile), so as to avoid overheating...

Thanks for your tips! Interesting thought on the squeal noise? That sounded like fan belts slipping and more like it was coming from the rear than forward where the belts are so I hope that your theory is correct. Raw water pump is confirmed to be operational and working my way back to exhaust...

I am a new owner of a 1986 Fu Hua(sp?) 34' Trawler with a Ford Lehman 120 diesel. Took it out for my 3rd very short harbor shake down test run. Allowed engine to warm up before leaving the slip and was out for approx 10 minutes, running at about 1500 rpm and reading 180 degrees temperature...