Weichai 6113 crankshaft of the engine parts piston ring in the free state, the outer diameter greater than the inner diameter of the cylinder, after assembling its outer surface close to the cylinder wall to form an elastic seal, when the piston rings up and down as the piston reciprocating in the cylinder When the high-speed movement, ring and ring and ring and cylinder wall groove keep friction, if the high temperature and poor lubrication conditions, will wear very serious, leading to work piston ring surface scratches, bites or corrosion or rupture, so that the ring and the cylinder wall, ring and ring groove end clearance and backlash and the backlash changes, changes in physical and mechanical properties of the ring, elasticity, elastic sealing effect decreased, resulting in leakage and channeling oil, diesel engine power down, oil consumption increased piston ring is easy to break and not work, so the piston ring wear is caused by damage to the main reason. The main form of wear and tear are: adhesive wear, abrasive wear, corrosion, wear and fatigue wear four kinds.