The main dimensions of the cylinder block
The cylinder block is cast from special low-alloy ductile iron. Cylinders are bored directly in the block and do not have insert sleeves. At the bottom of the cylinder block are five supports for the main bearings of the crankshaft. The crankshaft main bearing caps are machined as an assembly with the cylinder block, so they are not interchangeable and have risks on the outer surface to distinguish (see fig. Labels on the main bearing caps and conditional number of the cylinder block).
In front of the cylinder block there is a chain drive for the camshaft and the auxiliary drive shaft (oil pump, ignition distributor and fuel pump). The roller rotates in two steel-aluminum bushings pressed into the cylinder block. Since 1984, the rear hub has been made of sintered metal. Spare parts are supplied with bushings of nominal and repair size with an inner diameter reduced by 0.3 mm.
The camshaft drive cavity is closed by a cover with a front self-clamping crankshaft oil seal. At the rear, the crankshaft rear oil seal holder is attached to the cylinder block.
From below, the cylinder block is closed with a steel stamped oil sump. Cork-rubber gaskets are installed between the cylinder block and the crankcase, as well as between the cylinder block and the camshaft drive cover.