Selecting a piston for a cylinder (VAZ-21213)

Calculated clearance between piston and cylinder (for new parts) is 0.025-0.045 mm. It is determined by measuring the parts and is ensured by installing pistons of the same class as the cylinders. The maximum permissible gap (when parts wear out) - 0.15 mm.

If the clearance of a previously used engine exceeds 0.15 mm, then it is necessary to re-select the pistons to the cylinders so that the clearance is as close as possible to the calculated one.

Spare parts are supplied in class A, C, E pistons. These classes are sufficient to select a piston for any cylinder during engine repair, since pistons and cylinders are divided into classes with a small overlap of sizes. For example, a class C piston can fit cylinders of classes B and D.