故障现象某辆搭载东风康明斯6BTAA(155kW)增压空空中冷柴油机的东风牌载货车,行驶中感觉动力较以往有所下降,车辆负载后动力更加不足,尾气为蓝烟,且曲轴箱通风管向外排放机油和气体。过往维修出现故障后,该车曾在某修理厂按汽缸“下窜气”故障对发动机进行了一次大修,包括拆卸缸盖、取出活塞、检验活塞环、测量缸 Fault phenomenon Dongfeng Cummins equipped with 6BTAA (155kW) turbocharged air-cooled intercooled diesel Dongfeng trucks feel driving power than in the past declined, the vehicle load is more insufficient power, the exhaust is blue smoke, and crankcase ventilation Tube discharges oil and gas outward. After the past maintenance failure, the car had a repair shop in accordance with the cylinder “under the channeling gas ” failure of the engine overhaul, including removal of the cylinder head, remove the piston, check the piston ring, measuring cylinder