发动机上有不少小孔 ,由于位置不同其作用各异 ,在维修、保养中应保持其通畅 ,否则会产生种种不良后果。(1)活塞环槽径向孔、活塞销座轴向孔发动机工作时 ,为了使油环从气缸壁上刮下来的多余机油能及时地流回油底壳 ,活塞油环槽的底面和活塞销座上 ,分别钻有径向孔和轴向小孔 , There are many small holes on the engine, due to their different positions in different roles, maintenance, maintenance should be kept open, otherwise it will have all kinds of adverse consequences. (1) piston ring groove radial hole, piston pin axial hole engine work, in order to make the oil ring scraped from the cylinder wall excess oil can flow back to the oil pan in time, the underside of the piston oil groove and piston Pin seat, were drilled with radial holes and axial holes, respectively,