How to auscultate the abnormal sound of the piston rod group

When the engine is in operation, various types of abnormal sound may appear in the piston rod assembly. The main reasons for the abnormal sound are: the gap between the crankshaft main journal and the main bearing bush, connecting rod journal and connecting rod, piston and cylinder, piston pin and connecting rod copper bush is too large. For the abnormal sound, the following auscultation methods can be used to judge: 1. The knocking sound of the crankshaft journal and the bearing bush. When the main bearing bush wears or burns, the main bearing will suffer from heavy and stuffy sound. The method of auscultation is at the crankcase on the side of the valve train body, and it is listened to with a general rotation speed and an intermittent increase in rotation speed. 2. The knocking sound of the connecting rod journal and the bearing bush. If the connecting rod wears heavily, the bearing clearance increases and a louder, dumb sound is emitted. The sound after burning tile is even more violent and it is closer to the bell. The method of auscultation is to rotate the crankshaft at the side of the injection pump. After the engine is warmed up, it is heard at a low speed, and when the fuel supply to each cylinder is cut off, there is still a knocking sound. 3, piston and cylinder sleeve knocking sound. When the cylinder liner, piston wear, clearance increases, the piston swings its head under the effect of gas expansion at the top dead center, and a fierce dumb sound will be emitted. The method of auscultation is on the side of the fuel injection pump. When the positions of the cylinders are carefully listened at the top dead center of the piston, when the supply of oil is cut off from each cylinder, the sound disappears. 4. The knocking sound of piston pin and copper sleeve. When the piston pin bushing wears, the clearance increases, and a loud, “dang, dang,” sound is generated during engine operation. The method of auscultation is on the side of the fuel injection pump. He listens along the moving part of the piston and cuts off the oil supply. The sound disappears.

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