1.气门座圈柴油机的气门座圈是易损件,由于座圈的外径与气缸盖上的座圈孔是过盈配合,位置较小,难以拆卸。有的用户该换件时不换,致使气门与座圈孔密封不好,影响了柴油机的使用寿命,也有的用户拆卸时将座圈孔损伤。致使与新装上的座圈配合不紧,影响正常工作,严重时会损坏其它零件。因此,建议在气缸盖气门座圈孔的端面铣两个槽,其宽为8～10毫米,深为3～4毫米,如图1所示,以便工具插入拆卸。 2.飞轮柴油机的飞轮是维修中常拆卸的零件,该机飞轮的 1. Valve seat Diesel engine valve seat is wearing parts, because the seat ring diameter and seat ring hole is interference fit, the location is small, difficult to dismantle. Some users do not change when the change, resulting in poor sealing of the valve and seat hole, affecting the life of the diesel engine, and some users will be dismantled when the seat hole damage. Resulting in a new seat with a tight fit, affecting normal work, serious damage to other parts. Therefore, it is advisable to mill two grooves at the end face of the cylinder valve seat hole, which is 8 to 10 mm wide and 3 to 4 mm deep, as shown in Figure 1, so that the tool can be inserted and removed. 2. flywheel diesel engine flywheel is often disassembled parts, the flywheel