Re: [Amel Yacht Owners] melted muffler
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Another source of air leak is the seachest screwed cover. It may be mis-threaded, and the engine sucks air in. The seachest does not leak out sea water because the fridge circulation pump is enough to depressurise it...
As a tell tale on the 54, the stream of water overflowing out of the engine gooseneck into the cockpit scupper (companionway side) should be continuous once the initial startup coughs have gone. No noticeable exhaust smells from there.
Hope that helps
AMEL 54 #122