The engine cylinder block is cast iron, with gray cast iron insert sleeves with an acid-resistant insert in the upper part of the sleeve, by clamping the sleeve shoulder between the block and the block head through an asbestos gasket, and the lower part by two rubber rings
Cylinder numbering is indicated on the engine intake pipes.
The arrangement of the cylinders and the sequence of their operation are shown in Figure 1.
Cylinder block heador cylinder head made of aluminum alloy with plug-in seats and valve guides.
Asbestos steel sheet gaskets are installed between the block and the heads.
Each cylinder head is attached to the cylinder block by seventeen bolts, including four rocker shaft bolts.
The bolts for fastening the heads to the block must be tightened with a special torque wrench that allows you to control the tightening torque, since the aluminum head of the block increases in height when heated more than the steel bolts that fasten it.
When the engine warms up, the block head tightening increases, when it cools, it decreases, so the tightening torque of the block head bolts should be 7-9 kgm on a cold engine
Moreover, at an engine temperature below minus 5 ° C, the bolt tightening torque should be closer to the lower limit (7 kGm), and at a temperature of plus 20-25 ° C, closer to the upper limit (9 kGm).
When the engine is fully heated, the tension of the block heads automatically increases to the desired limit.
Simultaneously with tightening the bolts for fastening the heads of the block, it is necessary to tighten the bolts for fastening the exhaust gas pipelines, as well as the clamps for sealing the components of the gas pipelines.
To ensure full contact between the planes of the heads and the block, it is necessary to follow the tightening order of the bolts indicated in fig. 2.
Tighten the cylinder head bolts evenly, in two steps.
After tightening all the bolts, bolts 1, 2, 3, 4 and 5 must be further tightened.
When changing gaskets, clean all water holes in the cylinder heads and cylinder block.
The head cover fastening nuts must be tightened evenly with a tightening torque of 0.5-0.6 kgm