有一辆伏尔加轿车来我单位检修。听司机讲此车因动力不足、烧机油、排气管冒蓝烟等原因,更换了缸套、活塞及活塞环,出厂后第5天发动机出现“突突”声。经检查3缸不工作,机油里有水,初步判断为3缸缸垫冲坏。返回修理厂,修理人员拆下发动机缸盖,发现第3缸缸垫确实冲坏。同时用平规测量缸盖既不翘曲也不变形,故认为缸盖螺栓扭矩不够或缸垫质量差所致。更换新缸垫,按规定扭矩和顺序拧紧缸盖螺栓。但该车仅行驶3天又出 There is a Volga car to my unit overhaul. Listen to the driver to say this car due to lack of motivation, burning oil, exhaust pipe and other reasons, replaced the cylinder liner, piston and piston ring, the engine after 5 days the engine “bursts” sound. After checking the 3 cylinder does not work, there is water in the oil, initially judged as 3-cylinder cylinder pad washed. Returning to the repair shop, the mechanic removed the engine cylinder head and found that the 3rd cylinder head gasket did. At the same time using flat gauge cylinder head neither distortion nor warping, so that the cylinder head bolt torque is not enough or poor quality caused by the cylinder pad. Replace the new cylinder pad, tighten the cylinder head bolts in the specified torque and sequence. But the car only travel three days out