On the Abnormal Piston Ring Wear of a Marine Diesel Engine

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  • 船用ディーゼル機関ピストンリングの過大摩耗について
  • フネヨウ ディーゼル キカン ピストンリング ノ カダイ マモウ ニ ツイテ

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Abstract

Since the cylinder lubrication condition of marine diesel engine recently becomes very severe, sometimes piston ring wears to an abnormal extent. Authors investigated the mechanism of abnormal wear and its preventive measures by analyzing the initial lubricating condition of piston rings. As a result they have come to the following conclusions : 1. Severance of lubrication condition at the end of the stroke causes ring scuffing and accelerates secondary abrasive wear with its hard abrasives. 2. Cylinder oil of high alkalinity makes hard sludges at high temperature and accelerates scuffing because of its poor thermal stability. 3. The characteristics of metal compound are major factors of the abnormal ring wears, but the effect of total carbon and silicon contents is little. 4. The use of chamfered ring or liner with machine-finished surfece is effective for the prevention of abnormal wear.

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