Diesel Engine Early Fault Diagnosis Technology

Oil Analysis reports found that a copper content of the used oil sample taken from a diesel engine of Cummins K2000 series installed in a milling heavy-duty truck was over the warning line after using 350 hours. If this local fault had been not ruled out in time, the main oil pump would have been fault soon and caused the whole engine failure. In order to confirm the fault reason and reduce the maintenance cost, we adopted the wear partial analysis technology of lubricating oil to detect the using oil in engine. The results showed that the copper alloy engine parts had been not only severe abrasion on the surface but also high wear rate. Besides, a large amount of copper alloy wear particles were found after checking the oil filter element. Therefore, the engine was stripped down and the fault was diagnosed that the abnormal wear of copper alloy had been caused by the loosening of guide pins used in the main oil pump. After engine running 100 hours, the oil sample analysis results showed that all the abnormal wear disappeared.