Note. According to the outer diameter, the fingers are divided into three categories through 0.004 mm. The category is indicated by a colored mark on the end of the finger: the blue mark is the first category, the green mark is the second, and the red mark is the third.
Piston pin-to-piston mating is checked by inserting a pin pre-lubricated with engine oil into the bore of the piston boss. For proper mating, it is necessary that the piston pin enters the hole by simply pressing the thumb (pic. 2-26) and did not fall out of the boss (pic. 2-27), if you hold the piston with the piston pin in a vertical position.
Replace the finger that falls out of the boss with another of the following category. If there is a third category finger in the piston, then the piston with the finger is replaced.