The main dimensions of the cylinder block are given in fig. 2-25. The cylinder block is cast from special low-alloy cast iron. Cylinder diameters are divided into five classes through 0.01 mm, denoted by the letters A, B, C, D, E. The cylinder class is stamped on the lower plane of the cylinder block (pic. 2-26).
It is possible to bore cylinders for repair pistons, increased in diameter by 0.4 and 0.8 mm.
The main bearing caps are machined complete with the cylinder block. Therefore, they are not interchangeable and have risks on the outer surface to distinguish (rice. 2-13).