Since the piston and the piston pin are interference fit, when installing the piston pin, the piston should be heated to expand.
This approach is very wrong, because the piston parts are thin and uneven, the degree of expansion and contraction will be different, open fire heating will make the piston heat uneven, easy to cause deformation; The piston surface will also adhere to carbon ash, reducing the service life of the piston.
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 be significantly shortened.
Therefore, SINOTENG cautions that when installing piston pins, the piston can be heated evenly in hot oil to slowly expand and should not be heated directly with an open flame.