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目前,进口到我国的伏尔加轿车已有6代产品,前3代的缸盖螺栓都为10mm的细牙螺栓,规定的拧紧力矩为72～76N·m。由于该机采用的是湿式缸套,为了防止漏水,在修理中常人为地加大拧紧力矩,这样经常发生螺丝滑扣和拧断的事故。 一台3代的伏尔加发动机,大修后热试时,发现排气管侧的缸盖接合处渗水,随即又重新紧定缸盖螺栓,结果将第4缸(从前看)右侧的第一根螺栓拧断。拧断的部位如图1所示。拧断后留在缸体中的那一截螺栓,由于
At present, the Volga cars imported into our country have 6 generations of products. The first 3 generations of cylinder head bolts are 10mm fine bolts with the specified tightening torque of 72 ~ 76N · m. As the machine uses a wet cylinder liner, in order to prevent water leakage, often in the repair to increase tightening torque, so often happen screw skates and twist off the accident. A 3-generation Volga engine, hot overhaul after the test and found the exhaust pipe side of the cylinder head junction seepage, and then re-set the cylinder head bolts, the results will be the first 4 cylinder (previously seen) on the right of the first root Bolt twist off. Screw off the part shown in Figure 1. The bolt that remained in the cylinder after screwing off