小李:吴老师,我那台拖拉机的发动机工作很粗暴,汽缸中还发出“铛铛”的金属敲击声,这是怎么回事? 吴老师:这种现象就是我们平常所说的“敲缸”,产生这一故障的原因主要有以下几个方面:(1)供油时刻调整不当,使喷油泵供油时间提前;(2)出油阀减压 Xiao Li: Miss Wu, my tractor engine works very rudely. The cylinder also sends a “clang” metal percussion. What is going on? Wu: ​​This phenomenon is what we usually call “knocking Cylinder ”, the main reasons for the failure are the following aspects: (1) improper adjustment of fuel supply, fuel injection pump ahead of time; (2) the valve pressure