Hughes 38 Mark II
Join Date: Jul 2006
Location: Annapolis, MD
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Probably just a Water Moccasin that swam into your thru hull and is clogging the intake hose.
Put your face real close to the hose coming out of the thru hull as you take it off!!
In all seriousness, Camaraderie has the step by step diagnosis. Anything from debris in your thru hull, to a semi-clogged strainer, to a bad impeller, to worst case scenario of a heat exchanger that needs to be replaced all could cause this.
While you are checking the raw water circulation system, don't forget to check that your coolant is topped off (50-50 mix) in the closed system that makes up the other half of the cooling system. Also check the oil dipstick to make sure you do not have coolant mixed in the oil.
My guess is that you have a bad impeller in the raw water system, but you have a spare impeller kit onboard, right? (hint)