一磨合新柴油机使用前一定要先磨合,因为互相摩擦的零件表面上看光滑,实际上用放大镜看并不光滑。任何零件的表面都不是绝对的光滑的,零件表面总会存在着由较小间距峰谷组成的微观高低不平的痕迹。痕迹的波距小于1mm的属于表面粗糙度,也称为微观不平度。柴油机主轴颈和主轴瓦间隙0.07～0.11mm为正常,最大间隙为0.25mm。表面粗糙度的大小对零件的使用性能和寿命有很大影响。磨合时,柴油机转速应由小到大, A run-in diesel engine before use must first run-in, because the friction surface of the parts look smooth, in fact, with a magnifying glass to see and not smooth. The surface of any part is not absolutely smooth, the surface of the part there will always be composed of small pitch peaks microscopic rugged traces. Traces of wave pitch less than 1mm belong to the surface roughness, also known as micro-roughness. Diesel main journal and main bearing gap 0.07 ~ 0.11mm is normal, the maximum gap of 0.25mm. The size of the surface roughness of the parts performance and life expectancy have a significant impact. When running, diesel engine speed should be as small as possible,