When overhauling Bare Engine, the connecting rod bushing must be replaced at the same time as the piston pin to restore its normal fit.

The outer diameter of the connecting rod bushing and the small end hole of the connecting rod should have an interference of 0.10~0.20mm to ensure that the bushing does not rotate during operation.

If the interference is too large, it will make the bushing difficult to press and even damage the bushing. The matching of the connecting rod bushing with the small end hole of the connecting rod and the piston pin should meet the technical requirements.

The new bushing should be pressed into the small end hole of the connecting rod on a press or a bench vise. Before pressing, check whether there are burrs, curling and other phenomena in the small end hole of the connecting rod.

In order to avoid scratching the outer cylindrical surface of the bushing, the oil holes should be aligned when pressing the bushing to ensure smooth flow of lubricating oil.