2.9.2. Selection of the piston to the cylinder

The settlement gap between the piston and the cylinder (for new details) is equal to 0,025-0,045 mm. It is defined by a measurement of details and is provided with installation of pistons of the same class, as cylinders. The most admissible gap (at wear of details) – 0,15 mm.
If at the engine which was in operation, the gap exceeds 0,15 mm, then it is necessary to pick up anew pistons to cylinders that the gap was perhaps closer to settlement.
In spare parts pistons of classes A, C, E are delivered. These classes are enough for selection of the piston to any cylinder at repair of the engine as pistons and cylinders are broken into classes with small overlapping of the sizes. For example, the class C piston can approach cylinders of classes B and D. As well the class C piston can approach worn-out cylinders of classes A and B.