故障现象:发动机在运行中发生了活塞烧熔、环岸崩裂,或异响等后,就车更换了相关缸的活塞,却又出现了新的异响。有时再更换活塞,或连换数只活塞后,故障仍未排除。根据测得的气缸圆度、圆柱度偏差,亦没有超限。有的进行重新搪缸后,故障才消除;有的试着更换了多只异地生产的配件活塞后才解 Symptoms: engine running in the burning of the piston, cracking the ring shore, or abnormal sound, the car replaced the piston of the cylinder, but there have been new abnormal noise. Sometimes change the piston, or even change the number of pistons, the fault has not been ruled out. According to the measured cylinder roundness, cylindricity deviation, there is no overrun. Some of the re-boring, the fault was eliminated; and some tried to replace the piston after the production of more than just parts after the solution