Attention! 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: a blue mark is the first category, a green mark is the second, and a red mark is the third.
1. Piston pin-to-piston mating is checked by inserting a pin, previously lubricated with engine oil, into the bore of the piston boss. For proper mating, it is necessary that the piston pin enters the hole with a simple thumb pressure.
2. Check piston pin fit. It should not fall out of the boss if you hold the piston with the piston pin in a vertical position.
3. Replace the finger that falls out of the boss with another, of the next category. If there is a third category finger in the piston, then the piston with the finger is replaced.