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Abstract

A failure investigation has been conducted on the exhaust system of a high speed marine diesel engine in Turkish ambulance boats. Premature failures were reported on the poor starting, on the loss of power, on the lubricating oil leakage and on the engine overload. It was observed some significant tracks of sea water found its way into the exhaust passages from condensation of the salt water vapour and also from entering some sea water into the exhaust system. In order to initiate a more accurate cause investigation, the engine went through an overhaul inspection, in which it was determined that there were corrosion and some deposits throughout the exhaust system. After performing the systematic cause analysis of the engine damage, it is concluded that erroneous design decisions cause to siphon sea water back into engine, doing expensive damage. Ever since water has been used to cool exhaust gases, there will be many cases of engines flooding with water from the exhaust system. Recognizing the potential problems mentioned in this paper, a wet–exhaust system is recommended to keep water out of all small and indoor marine propulsion engines

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