气门折断会造成不同程度的机件损坏,轻则局部损伤,重则全机报废,甚至造成人身事故。特别是经换气门修复的发动机,在试车或使用过程中,更要防止发生气门折断。产生这类故障,除气门本身质量不佳外,主要有以下原因(均指顶置式气门): 一、操作不当有些机手喜欢冷车时用轰油门 Valve breakage will cause varying degrees of damage to the machine, ranging from local damage, heavy machine was scrapped, or even cause personal accidents. In particular, the engine repair valve, during the test or use, but also to prevent the occurrence of valve break. Produce such failures, in addition to the poor quality of the valve itself, mainly for the following reasons (both refers to the top-mounted valve): First, the improper operation Some of the hand machines like cold when the throttle with the throttle