Abstract
A previous investigation regarding actual circumstances of the wear of low speed, long stroke 2 stroke marine diesel engines clarified their abnormal wear conditions. Since then makers have taken various countermeasures against wear, and in order to confirm the effects, the Japan Ship Owners Association has been collecting wear data. This report describes the results of wear conditions, based on the data of two years (April 1987-March 1989). 1. Statistics of Oil Feed Rate of each type. There are no differences between the actual feed rates converted in catalogue MCO of A type and C type. 2. Analysis of Wear Rate of Linear and Piston Ring. Liner wear characteristics of A type is getting stable comparing with the last investigation. But on the contrary, excessive wear of ring takes place similarly on A type, C type and D type. 3. Analysis of Oil Feed Rate - Wear Rate. It has been clarified that wear rate differs with each diesel maker. 4. Analysis Derating Rate - Wear Rate - Oil Feed Rate. A higher wear rate is found in the higher derating engine, and it is clarified that the oil feed rate on a high derating engine is too small.
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