OILMISTDETECTOR (OMD) is an apparatus which measures oil mist level in the engine crankcase to avoid crankcase explosion． It is known that crankshaft damage due to main bearing problems results in long-term stoppage of vessel． Since oil mist is detected during such problems， the authors propose to utilize OMD as an early warning device to prevent main bearing damage by lowering its alarm level． conducted on a vessel to achieve the study’s purpose
