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The study aims to determine the failure cause of an internal combustion engine, in a particular case for a medium displacement diesel engine. The general issue of internal combustion engines failure is very complex and comprehensive. The assumed analysis for achieving this objective is complex and involves a multidisciplinary and gradually approach of the problem, as well as the development of an appropriate methodology to ensure the accuracy of the outcome. In principle, the cause of the engine breakdown is related to its mobile equipment. Based on this assumption, the authors identified all the affected moving parts organs and defined the damage they recorded. Neither fixed collaterally affected parts have been neglected, due to the organic interaction between the mobile equipment and the fixed parts of the engine. The present paper is a real "good practice support" in approaching the causes of fatal destruction of engines, the theoretical considerations being accompanied by a case study.

Connecting rod; oil degradation; scanning electron microscope; surface chemical analysis; energy potentials