Lately, a kind of low-grade bunker fuel oil is being supplied for marine diesel engines at certain ports and causes them severe troubles like abnormal wear and scuffing of cylinder liners. The authors have got the sam-ples of such fuels and examined their combustion characteristics using a visual combustion chamber. It is a new facility for study of bunker fuel combustion. According to results of examinations, a cause of the trouble can be guessed with good confidence.
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