1、 Avoid heating the piston with open flame

As the piston and piston pin are interference cooperation, the piston shall be subject to thermal expansion before installing the piston pin Crane rental company Our repairman will heat the piston directly on an open flame. This is very wrong. Because the thickness of the piston is uneven, the degree of thermal expansion and cold contraction will be different. Heating by open flame will cause uneven heating of the piston and simple deformation; Carbon ash will also be attached to the piston surface, reducing the service life of the piston. If the piston is cooled naturally after reaching a certain temperature, its metallographic structure will be damaged, and its wear resistance will be greatly reduced, and its service life will also be significantly shortened. When installing the piston pin, the piston can be evenly heated in hot oil to make it expand slowly. Never directly heat it with an open flame Huai'an Crane Leasing Company The small editor of Xinyu Big Piece will give you a detailed introduction:

2、 Do not use gauze to polish the bearing bush

For some inexperienced repairmen, scraping tile is a difficult operation. Because it is difficult to grasp the skill of scraping the bearing bush, it is not easy to meet the skill requirements. For this reason, when someone replaces the bearing bush, in order to increase the touch area between the bearing bush and the crankshaft, they use emery cloth to polish it instead of scraping the bearing bush. This method is extremely undesirable in practical repair. Because the abrasive grains on the abrasive cloth are hard while the bearing alloy is soft, the abrasive grains are simply embedded in the alloy during grinding, which will accelerate the wear of the journal during diesel engine operation and shorten the service life of the crankshaft.