A diesel engine cold start abnormal noise troubleshooting and optimization scheme
This article addresses the strange noise of cold start idle speed of a diesel engine of a certain model by applying the subjective assessment of the test and simulation analysis,the test validated the NVH analysis method of the Gong and determined that the cold start odd noise issue with the diesel engine on this model was caused by the oil pump dampening hole being too large in diameter,causing the oil pump pressure relief valve spool to easily enter an over-regulated unstable vibration condition,which in turn caused the cooling system components to vibrate.The oil pump was simulated and tested,and the proper adjustment of the damper bore size eliminates the cold start idling noise issue on the diesel engine.
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