缸盖螺母扭矩过大除易引起螺栓、螺母、机体螺孔滑扣、螺栓拉长及折断外,实践证明,还有以下危害: 一、气门座易变形我们在对修后的发动机进行台架试验时,发现气门与气门座之间漏气。其现象是:发动机空转时,排气冒白烟且在进气管处能听到漏气的声音,怠速时,尤其明显。 Cylinder head cap nut torque is too large In addition to easily lead to bolts, nuts, body screw slide, bolt elongation and breakage, the practice proved that there are the following hazards: First, the valve seat is easy to deform We repair the engine after the bench During the test, it was found that there was a leak between the valve and the valve seat. The phenomenon is: the engine idling, exhaust white smoke and can be heard in the intake pipe leaks sound, idling, especially obvious.