一、汽缸间隙过大由于相互摩擦和高温、高压气体氧化、腐蚀而使缸套、活塞、活塞环磨损,造成气缸间隙过大、密封不良,产生敲击声。缸套与活塞磨损超过极限时,要搪缸,同时要换加大的活塞;活塞环失去弹性或开口间隙、侧间隙超限时,要更换活塞环。二、活塞与连杆小头铜套磨损活塞销与连杆小头铜套的间隙增大后,发动机低速运转时,在汽缸上方可听 First, the cylinder gap is too large due to mutual friction and high temperature, high pressure gas oxidation, corrosion and cylinder liner, piston, piston ring wear, resulting in excessive cylinder clearance, poor sealing, knocking sound. Cylinder liner and piston wear exceeds the limit, you want to cylinder, at the same time to change larger piston; piston ring loss of elasticity or opening clearance, side clearance exceeds the limit, to replace the piston ring. Second, the piston and connecting rod small copper sleeve wear piston pin and connecting rod small copper sleeve gap increases, the engine low speed operation, the cylinder above the audible