一台东方红-150拖拉机不易起动,工作无力。检查发现,活塞环严重磨损。更换一副新活塞环,工作不久又旧病复发。拆卸检查发现,活塞上各道环的开口均处在同一方位,又更换新气缸套后,发动机工作正常了。原因是旧气缸套失圆过大,当活塞环开口转到不圆处时被阻滞不转,造成各道活塞环开口集于同一 Dongfanghong -150 tractor is not easy to start, work weak. Inspection revealed that the piston ring was severely worn. Replace a new piston ring, work soon relapse. Demolition inspection found that the piston rings on the openings are in the same orientation, and replaced the new cylinder liner, the engine is working properly. The reason is that the old cylinder liner out of round too large, when the piston ring opening is not round at the block was not transferred, resulting in each piston ring openings set in the same