The sound emitted by the engine during normal operation is crisp and uniform. Abnormal noise is generated early or late in the oil supply time. The collision sound between the pairs of movements is too large and the clearance is too great. The valve gap is mis-aligned. The friction sound after the parts are damaged. When overhauling, determine what kind of faults it belongs to based on the diesel engine's exhaust, smoke, noise frequency changes, vibration intensity, and the occurrence of fault signs, and adjust and repair according to technical requirements.
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