Join Date: Jun 2006
Location: Philadelphia, PA
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Re: problem diagnosis needed, no speed, smoke, low rpms
Is your wet exhaust discharging normally? if not, then check the elbow on your exhaust manifold. I had the exact same problem and realized the wet exhaust was exiting the elbow because it had a hole in it. The water drained to the bilge instead of out the exhaust pipe.
Overtime the interaction of seawater and exhaust gases cause minerals and carbon to precipitate on the walls of the elbow. Eventually the elbow clogs (like a heart attack) causing the exhaust pressure to build up and blow a hole in the manifold. You won't get an overheat alarm because the raw water is doing its job cooling the engine. The reason you have low rpms may be due to a pressure imbalance between the engine and the manifold. Replacing the elbow will eliminate the problem if this is indeed the problem.
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Last edited by Yamsailor; 01-09-2013 at 03:36 PM.