How much do you know about the ten taboos in construction machinery maintenance? It’s been a week, so let’s continue looking at item 5 today.
Piston open flame heating
Since the piston and piston pin have an interference fit, when installing the piston pin, the piston should be heated and expanded first. At this time, some maintenance personnel will place the piston on an open flame to heat it directly. This approach is very wrong, because the thickness of each part of the piston is uneven, and the degree of thermal expansion and contraction will be different. Heating with an open flame will cause the piston to be heated unevenly and easily cause deformation; there will also be carbon ash attached to the surface of the piston, which will reduce the strength of the piston. service life. If the piston cools 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 placed in hot oil and heated evenly to cause it to expand slowly. Do not use an open flame for direct heating.
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Post time: Jun-12-2024