Does anyone have a vented loop on their engine cooling water hose (between the heat exchanger and the exhaust elbow)? Do you think it's necessary, and any regrets / things you would change? If you have one, where is it mounted? (particularly for LF38 layout, but any C&C over 32' would probably be relevant)
I searched the archives for previous discussion of this but couldn't find anything. A diesel mechanic I'm having work on the engine (Yanmar 3HMF) recommended a vented loop as a precautionary / extra-careful measure. Our exhaust elbow is a few feet above waterline, and I'm skeptical we could ever be heeled enough to bring it below heeled waterline (we've had the toerail in the water before, and afaik the boat has never had a waterlock issue). But I see his point about it maybe being cheap insurance against a big problem. Background: a vented loop is sometimes installed between the heat exchanger and the exhaust elbow to prevent water in the hose from siphoning into the engine, resulting in hydrolock or worse (engine being ruined). It has nothing to do with the exhaust hose exiting the boat (past the exhaust riser). The need for it is determined by whether the exhaust elbow can be below heeled waterline or not. Opinions on the Internet diverge (some people think they're necessary, some don't). So I'm interested in what C&C folks have since this is very specific to engine layout. -Patrick 1984 C&C LF38
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