柴油机使用过程中,沿活塞运动方向常会出现一些划伤痕迹,严重时还会发生咬缸,其直接原因大多是由于活塞与气缸壁间润滑油膜受到破坏而造成的。气缸拉伤后,活塞与气缸壁间会产生敲击声响。此外,由于活塞与气缸壁的配合间隙增大,密封性能变差,导致曲轴箱内机油窜入燃烧室,不 In the process of using diesel engine, some scratches often appear along the direction of the piston movement, and the bite tank may occur in severe cases. Most of the direct causes are the destruction of the lubricating oil film between the piston and the cylinder wall. After the cylinder strain, the percussion sound will be generated between the piston and the cylinder wall. In addition, due to the piston and cylinder wall with the gap increases, the sealing performance deteriorates, leading to the crankcase oil fleeing into the combustion chamber, not