How to determine the repair size of automobile cylinder?

When the worn cylinder is repaired by honing cylinder, the maximum wear of the cylinder with the largest wear diameter (the cylinder with the largest wear diameter) plus the machining allowance (generally 0. 10mm, diameter 0.20mm) should be calculated first to determine the repair size. Then select the first-level repair quantity suitable for this value. After the repair size is determined, the filing amount and grinding amount of each cylinder must be carried out according to the same repair size. When using the positioning file cylinder, the eccentric wear of the cylinder should also be considered, and the corresponding repair size should be determined after repeated measurement. The repair size of gasoline engine cylinders is usually divided into six grades. Based on the nominal size of cylinder diameter, the repair size of several grades is increased by 0. 25 mm, i.e. +0.25mm, +0.50mm, +0.75mm,+1.00mm, etc. If the cylinder wear exceeds the maximum size, install the cylinder liner (dry) or replace the cylinder liner (wet).