Phenomenon: When the diesel engine is running at a high speed, a continuous, rhythmic “bang, bang, and bang†percussion sound is emitted at the valve chamber cover. The higher the rotational speed, the louder the sound is.
Causes: 1. Valve clearance adjustment is too large. 2, rocker bushing worn too much. 3, rocker seat fastening screws loose. 4. The valve adjustment screw lock nut is loose.
Diagnosis: Remove the valve chamber cover, shake the piston to the top dead center of the compression stroke, and use a feeler gauge, visual inspection or a sense of sight to find out.
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