Design features of the cylinder block (VAZ-2101)

The cylinder block is the basic part on which various mechanisms and auxiliary units of the engine are mounted. It is cast from special low-alloy high-strength cast iron. The cylinders are bored directly in the block and do not have insert sleeves. Both pistons and cylinders are divided into 5 classes by diameter (through 0.01 mm): A, B, C, D, E. Cylinder class (latin letter) is stamped on the lower plane of the block opposite each cylinder.

The lower part of the cylinder block contains five bearings for the crankshaft main journals with thin-walled steel-aluminum liners. The bearing caps are attached to the block with self-locking bolts, which cannot be replaced with any other bolts.

The bores for the main bearings are machined together with the caps, so the bearing caps are not interchangeable and have marks on the outer surface to differentiate them (see fig. 50). The bearing supports and their corresponding caps are counted from the front end of the cylinder block. In addition, each cylinder block and its main bearing caps (see fig. 50) are stamped with the same conventional number so that when repairing the engine, the covers are not accidentally installed in the "wrong" cylinder block. On the cylinder block, this number is stamped on its lower surface near the oil filter.

In the left front part of the cylinder block there is a small cavity in which the drive shaft of the oil pump and ignition distributor is installed parallel to the engine axis (see fig. 24). The roller rotates in two steel-aluminum bushings pressed into the cylinder block. Since 1984, the rear bushing has been made of metal ceramics. Bushings of nominal and repair sizes with an internal diameter reduced by 0.3 mm are supplied as spare parts.

The cylinder blocks of the 2101 and 21011 engines have different cylinder diameters and are therefore not interchangeable. They can be easily distinguished by the model number cast on the left side of the cylinder block.