Taboos in construction machinery maintenance—Inaccurate measurement of cylinder clearance

When measuring the cylinder clearance, it is not possible to measure in the direction of the piston skirt perpendicular to the piston pin hole, but in other directions.

The structural characteristics of the aluminum alloy piston are that the top is small and the bottom is large, it is a cone, and the skirt section is oval, so the cylinder gaps along the circumferential direction are not equal. When measuring, it is stipulated that the gap in the direction of the long axis of the ellipse shall be taken as the standard, that is, the gap in the direction of the piston skirt perpendicular to the direction of the piston pin hole shall be measured. This measurement is more convenient and accurate, and during reciprocating motion, the direction of the piston skirt perpendicular to the piston pin hole is subject to greater wear due to the lateral pressure. Therefore, when measuring the cylinder clearance, the piston skirt should be perpendicular to the piston. Pin hole direction measurement.

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