Failure Diagnosis on Damages of a Diesel Engine Caused by Contaminants
through Analysis of Wear Particles in Oils
Masaharu SUZUKI, Tetsuya HOSOYA, Kazuo NAKAMURA, Yasutomo SONE
In order to diagnose inner damages of a diesel engine caused by contaminants,
an artificial seizure between crank axle and crankpin bearings caused by contaminants
enclosed in crankpin bearings was examined using a real engine for railroad. Engine
oils sampled periodically during the tests are analysed by ferrography and also by
spectroscopy as required. The results are as follows; 1) The rate of wear in engine
in the presence of contaminants was several hundred or thousand times higher than that
under normal conditions. 2) The mechanism of an engine failure caused by contaminants
enclosed in crankpin bearings is shown schematically.