The main reason for the piston knocking cylinder
The main reasons for the piston knocking cylinder are as follows:
(1) The clearance between the piston and the cylinder wall is too large. The standard clearance of the piston skirt and cylinder of the WD615 series engine is 0.143-0.182, and the maximum wear limit is 0.35-0.40.
(2) After the engine runs for a period of time, the cylinder piston wears out, and the lubrication is not good. The matching clearance between the piston and the cylinder increases due to wear, and a serious step appears in the first gas ring slightly, causing the piston to knock. The cylinder hits an abnormal sound.
(3) After the piston skirt and the cylinder are running for a period of time, the wear is severe, causing serious rounding and knocking on the cylinder.
(4) Individual connecting rods are deformed due to various reasons, causing the piston to be eccentric, and the gap becomes large and the cylinder is knocked. The piston knocking cylinder will result in excessive engine fuel consumption, engine oil consumption, oil consumption, and poor economy. When the piston knocks the cylinder seriously, it will pull the piston and break the cylinder, so that the connecting rod breaks and the cylinder block is damaged.