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Old 04-27-2016, 09:56 PM   #1
RonM55
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City: Port Salerno, FL
Join Date: Apr 2016
Posts: 5
SP 135 Knocking Sound

Hoping for some thoughts here. Our starboard 1987 SP 135 has started making a very unpleasant loud knocking sound. Im no a mechanic (at all) but here is what the "mechanics" have done.

Had normal servicing done on Heat Exchangers and coolers. Bad fitting and hoses replaced, coolant replaced.

At sea trial, starboard engine shuts down. Mechanic blends some air, but engine won't stay running.

Next day mechanic starts engine at dock...runs fine. Run the engine in gear at dock...runs fine.

2nd sea trial after 40 min engine starts making loud knocking sound.

Mechanic suspects fuel prob.

Today mechanic tests fuel system. Checks out.

Mechanic fears water has entered 4,5 & 6 via exhaust elbow causing cylinder damage.

Here is what I know.

Engine has never: hydro locked, overheated, burned exclusive oil or had any issues starting. There is heavy corrosion on the 4, 5, 6 side of the exhaust manifold interior.

Really appreciate any thoughts.
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