一台装载机在使用过程中,出现柴油机工作无力,曲轴箱通风口大量冒烟的现象。拆检时发现5个缸活塞环全部对口,于是更换了新活塞环并重新安装。但工作10多天后,故障重复出现。再次拆检时发现Ⅴ缸活塞环又出现了对口现象,其他缸的活塞环也有不同程度的开口错位,初步认为是活塞环质量可能存在问题,随即更换了优质的活塞环, A loader in use, there is a diesel engine work, crankcase ventilation a lot of smoke phenomenon. Dismantling found 5 cylinder piston rings all counterparts, then replaced the new piston ring and reinstall. However, more than 10 days after work, the fault recurring. Another dismantling found that the Ⅴ piston ring appeared counterparts phenomenon, the other cylinder piston ring also have different degrees of opening dislocation, the initial view that there may be problems with the quality of the piston ring, then replace the high-quality piston rings,