在柴油机修理实践中,经常会发现活塞顶部有被气门撞出的凹坑。这当然是很不正常的故障现象,如不及时处理往往还会引发更严重的事故和零件损坏据笔者的实践体会,该故障的常见原因一般有以下几种。 1.活塞气门间距过小 柴油机同汽油机相比,压缩比高得多,故压缩上止点时,气门与活塞顶面间隙甚小。更换气门组件时,如果气门 In the practice of diesel engine repair, it is often found that the top of the piston is pitted by the valve. Of course, this is a very unusual phenomenon of failure, if not promptly dealt with will often lead to more serious accidents and parts damage According to the author’s practice experience, the common causes of the failure are generally the following. 1. Piston valve space is too small Diesel compared with the gasoline engine, the compression ratio is much higher, so compression on the dead center, the valve and piston top clearance is very small. When replacing the valve assembly, if the valve