The correct fit of Bare Engine can be achieved through processing methods such as reaming or boring of Bare Engine.

Select reamer: Select reamer according to the standard size of piston pin, and clamp the reamer vertically on the bench vise.

Usually, the blade is adjusted with one knife to expose 3~5mm of the plane on the Isuzu Engine, depending on the future processing allowance of each tool.

The allowance is large, and the nut can be rotated and adjusted by 60mm. °~90°, the allowance is small, and the adjustment nut is rotated 30°~60°.

Practice has proved that too much or too small back cutting will cause the reamer to jump during reaming, and the dumplings will have edges or bell mouths.

Reaming: When reaming, hold the small end of the connecting rod with one hand, apply slight pressure downward, hold the big end of the connecting rod with the other hand, and pull the connecting rod evenly in a clockwise direction for reaming. When reaming, the connecting rod axis should be perpendicular to the knife axis to prevent reaming from biasing the Isuzu Engine.