浅谈工程机械中五种零件的维修技巧(国外英文资料).doc

浅谈工程机械中五种零件的维修技巧(国外英文资料) Discussion on maintenance skills of five kinds of parts in construction machinery 2009-3-11 1 、 repair the deformation of engine cylinder head Our company two Japanese Kawasaki KLD85Z loader, the engine cylinder head because of the long-term work in high temperature, high pressure, heat load and alternating load and warp, cylinder pad from channel mouth washed out, causing the combustion chamber pressure drops, the power of the engine and radiator inlet water coming out. Continuously changed two times the cylinder pad, each use a month after it was washed again. After examination, it is found that the cylinder block and cylinder head all deform. The flatness error of the cylinder is 50 m, but also meet the technical requirements, but the flatness error of the cylinder head is up to 0.20mm, this is the main reason for the deformation of the cylinder are washed out. We use the method to repair, because the machine cover no combustion chamber concave, does not need to consider the change of combustion volume (change of combustion chamber volume value should not be greater than the volume of 4%), using the method of plane milling cylinder head plane; the joint channel at the mouth of a copper pad installed in the cylinder head and the cylinder (the copper pad thickness is 1.2 times the thickness of the concave channel mouth), instead of on the cylinder head gasket rubber sealing ring, and then install the cylinder pad, and the first cold heat tight tight solid cylinder head bolt. An engine that has been repaired by this method has no trouble with the flush pad. 2 、 emergency repair of dry type thin-wall cylinder liner Our company is a Komatsu WA420 loader, due to long-term work in the field, using the engine cooling water containing minerals are more, in addition to the neglect of maintenance of cooling system cleaner, engine crankcase cavitation occurred in II cylinder, the thin-walled cylinder is cavitation, the size of the hole diameter of 2