Phenomenon: A knocking sound of the piston pin. When the diesel engine is working, the sound of a hammer striking the drill is heard in the vicinity of the cylinder. It is a front and a rear double ring and the pitch is high. When the diesel engine is running at a low speed, the sound is relatively slow. When the engine speed is increased, the sound is also increased.
Causes: 1. The piston pin and the connecting rod bush are worn too much and loose. 2, the piston pin and piston pin seat with loose.
Diagnosis: 1. When the diesel engine is running, use a screwdriver to resist the front of the cylinder (the side of the cylinder head), and put the ear on the wooden handle of the screwdriver to hear the sound. 2, remove the cylinder head, the piston to the top dead center, turn the piston by hand to the left and right, the piston has activity.
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