东方红—54/75拖拉机缸套与活塞组装时,按技术要求是分组选配的,其装配间隙为0.25～0.29毫米。但供应时却没有按分组供应,给修理装配带来很多麻烦。如我们这里,有时候只进Ⅱ组的缸套,尺寸是φ125_(0.03)~(0.05)毫米,而活塞是Ⅰ组的,尺寸是φ125_(-0.26)~(-0.24)毫米,其配合间隙为0.27～0.31毫米;有时候进来Ⅰ组缸套,其配合间隙也常常是0.27～0.29毫 Dongfanghong -54 / 75 tractor cylinder and piston assembly, according to technical requirements are grouped matching, the assembly gap of 0.25 ~ 0.29 mm. However, the supply was not provided by sub-group, which brought a lot of trouble to the repair and assembly. For example, in our case, there are only two sets of cylinder liners, the size is φ125_ (0.03) ~ (0.05) mm, and the piston is a set of φ125_ (-0.26) ~ (-0.24) mm, 0.27 ~ 0.31 mm; sometimes come in Group I cylinder liner, the gap is often with 0.27 ~ 0.29 milli