发动机拉缸主要原因有以下4个方面:一是活塞与气缸壁配合间隙过小;二是活塞环折断或开口间隙过小;三是活塞销孔与销过盈配合过大导致活塞产生不正常变形;四是连杆变形使活塞在缸内倾斜。起初技术人员认为东风车拉缸是上述第一种原因造成的,后3种原因在一般正常的使用与维修条件下极少起作用,加上活塞一般都已改进了减少热变形量的结构,更加认定活塞与缸壁间隙过小是造成拉缸的原因。于是不断试验调整间隙,虽然拉缸现象后来少了一些,但效果不是很理想。一定还有其它造成拉缸的原因,据观察,拉缸 The main reason for pulling the cylinder engine has the following four aspects: First, the piston and cylinder wall with the gap is too small; Second, the piston ring is broken or opening clearance is too small; Third, the piston pin hole and pin interference with excessive lead to the piston is not normal Deformation; four is the connecting rod deformation so that the piston in the cylinder tilt. Initially, technicians think that the East Windmill cylinder is caused by the first reason mentioned above. The latter three causes are rarely used under the normal conditions of normal use and maintenance. In addition, the piston generally has a structure that reduces the amount of thermal deformation, Determine the piston and cylinder wall gap is too small is caused by pulling the cylinder. So constantly adjust the gap test, although the cylinder after a few less cylinder phenomenon, but the effect is not very satisfactory. There must be other reasons for pulling the cylinder, it is observed, pull the cylinder