焦化发电机组发动机机体是由灰口铸铁原材料筑成的壳体，工作上承担各种各样里外负载，一般情形下机体毁坏有下列几类方式：

The engine body of coking generator set is a shell made of gray cast iron raw materials, which bears various internal and external loads. Generally, the body is damaged in the following ways:

1、冻破。这也是冬天发动机非常容易产生的毁坏。机体发生的裂纹仅有在没有承受力的位置才可以用喷焊法修复。更先在裂纹两边打止孔裂，随后沿裂纹栽多个颗钉子，再垂直平分裂纹方位补板若干块，用低碳钢焊条沿裂纹和补板焊牢。留意边焊边用铁锤轻拍焊接，所有焊过后再用火苗纠正。

1. Frozen. This is also very easy to cause damage to the engine in winter. The cracks of the engine body can only be repaired by spray welding at the position without bearing force. First, drill holes on both sides of the crack to stop the crack, then plant several nails along the crack, and then vertically divide several pieces of repair plates along the crack direction, and use low-carbon steel welding rod to weld firmly along the crack and the repair plate. Pay attention to tap welding with hammer while welding, and correct with flame after all welding.

2、左右平衡轴端205轴承孔损坏。这样的事情务必立刻维修。轴承孔损坏比较轻时，可以用增加205轴承外圆法修复，在轴承外侧用氧焊将刚丝对称点在个小一点，用锉调整一下，随后压进轴承孔就可以应用。另一种方式是用2mm厚的不锈钢板做一个内螺纹为50mm的大平垫圈，在平垫和机体上做三个丝孔，用平头螺钉固定不动上来。当轴承孔损坏比较严重时，可以镗大原孔镶套，并在嵌入的轴套和机体交接处做三个小丝孔，用螺丝固定不动。

2. The left and right balance shaft ends 205 bearing holes are damaged. Such things must be repaired immediately. When the bearing hole is slightly damaged, it can be repaired by adding 205 bearing outer circle. Use oxygen welding on the outside of the bearing to make the symmetrical point of the rigid wire smaller, adjust it with a file, and then press it into the bearing hole. Another way is to use 2mm thick stainless steel plate to make a large flat washer with internal thread of 50mm, make three wire holes on the flat washer and the body, and fix it with flat head screws. When the bearing hole is seriously damaged, the original hole insert sleeve can be bored, and three small wire holes can be made at the junction of the embedded shaft sleeve and the body, and fixed with screws.

3、缸头地脚螺栓孔滑丝或损坏。这样的事情是因为扭紧缸头螺帽时用劲过大或捣缸导致。如果是某些丝孔滑丝，可再次改丝，并生产加工一个与该丝孔配套设施的缸头地脚螺栓就可以。假如丝孔损坏或好几个丝孔滑丝则不可以修复。

3. The cylinder head anchor bolt hole is slipping or damaged. This kind of thing is caused by too much force when tightening the cylinder head nut or tamping the cylinder. If some thread holes are slippery, the thread can be changed again, and a cylinder head anchor bolt supporting the thread hole can be produced and processed. If the wire hole is damaged or several wire holes are slippery, it cannot be repaired.

4、砂眼。先用刚丝锥钻孔，随后用铝丝塞住，或用焊接法塞住就可以。

4. Trachoma. First drill with a steel tap, and then plug with aluminum wire, or plug with welding method.

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