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Thanks everyone for your comments, I found the problem. Half way up the intake tube was partially blocked and one of the hoses was falling in on itself. All fixed and my trip around the Island was success and I ran her WOT for a good hour too with perfect temperature. The only problem I can see...

Hey John, that's an interesting idea - Air in the System. I should take the hose off anyway to see if the problem is at the pump or after the exchanger. My boat is moored at Westport same spot since 1974. I, however, just acquired her after 2 years of friendly negotiations with the original...

Thanks guys but as I mentioned before I've cleaned the heat exchangers (engine & trans), cleaned the intake strainer and replaced the impeller. I had the boat out of the water for new bottom coat and checked the water intake, free & clear. I was hoping their might be a common area elsewhere I...

Hello, I am looking for suggestions on what might be hanging up my raw water cooling system from flowing freely. The boat is new to me but built in the 70's and the previous owner says the water should be flowing a lot faster than what's happening, especially at higher RPM's. The engine is a DD...