我公司现有EQ153型货车20辆以上,该型车装配康明斯6BT发动机,已运行8年,大多数发动机已进行过二三次镶套(采用康明斯6BT发动机气缸套配件)修理。随着运行时间和修理次数的增加,有的发动机气缸体底孔(气缸套承孔)的直径超过了允许极限,气缸套和气缸体底孔之间的配合由规定的过盈配合变成了间隙配合。如一发动机气缸体,镗缸前压出旧气缸套后,测得 Our company has more than 20 EQ153 trucks equipped with Cummins 6BT engines and has been operating for 8 years. Most of the engines have been repaired two or three times with Cummins 6BT engine cylinder liner fittings. With the increase of the running time and the number of repairs, the diameter of the bottom hole of the engine cylinder block (cylinder sleeve bearing hole) exceeds the allowable limit, and the cooperation between the cylinder sleeve and the bottom hole of the cylinder body becomes a prescribed interference fit Gap fit. Such as an engine cylinder block, boring cylinder out of the old cylinder liner, measured