Ferrographic Analysis of Lubricating Oil for Marine Diesel Engine

An investigation of the wear diagnosis of marine diesel engines is carried out to confirm the applicability of ferrography.In this report, as the first step, oil samples taken periodically from engines in service are analyzed by means of both quantitave and analytical ferrography.Results are summerized as follows:(1) The initial wear condition of the sliding machinery parts is distinguished from the normal wear condition by the observation of the wear particles concentration (WPC) and/or the wear severity index (Is) .(2) The quantity of wear particles in the cylinder/system oil increses where crank-pin bearengs failed.(3) The values of the wear particles concentration (WPC) and the wear severity index (Is) for the cylinder oil increase extremely where the abnormal wear of piston rings occured.These results suggest that the ferrography for lubricating oil is effective in the monitoning the condition of the diesel engines.