When measuring cylinder clearance, it is not possible to measure in the direction of the piston skirt perpendicular to the piston pin hole and in other directions.
The structure of aluminum alloy piston is small at the top, large at the bottom, a cone, and the skirt section is oval, so the cylinder gap along the circumference direction is not equal.
According to experienced service personnel from SINOTENG, the clearance in the direction of the ellipse axis is required when measuring, i.e. the clearance in the direction of the piston skirt perpendicular to the piston pin hole.
This measurement is more convenient, accurate, and in the reciprocating movement, the piston skirt perpendicular to the direction of the piston pin hole due to the role of lateral pressure wear larger, so, when measuring cylinder clearance, should be in the piston skirt perpendicular to the direction of the piston pin hole measurement.