Yaroslavl Engine Plant YMZ-536 Operation Manual page 53

The six-cylinder block is made of grey cast iron. It serves as a
mounting base for all engine parts and units.
Each cylinder liner seat bore has a circular groove for the liner
collar in the upper part and a cylinder-shaped hole in the lower part
made coaxially.
The cylinder liner is wet type, made of phosphoric pig iron.
The liner is centered in the block by the outside diameter of the collar
and by the bore diameter in the lower part.
The liner cooling cavity is sealed by means of precision
finishing (w/o sealant or rubber rings) at the upper collar, and by
means of two rubber rings installed into the grooves in the lower part.
The walls of the water jacket form a sort of stiffener around
each cylinder seat bore and connect the upper and the lower decks of
the cylinder part of the block thus providing the required structural
stiffness.
For additional stiffness, near each of the crankshaft main
bearings on both sides the block has vertical stiffening cavities, from
the sump to the cylinder head. Through these cavities oil from the
cylinder head is drained into the oil sump.
The oil sump cross-walls of the block have seven seats with
inserts for the crankshaft main journals.
The main bearing caps are fixed on the block with two bolts.
The crankshaft seats bores are machined when the shaft is assembled
with the caps, therefore the main bearing caps are not interchangeable.
The cap sequence number is embossed on the cap bosses (near
the bolt heads). The counting starts from the block front. To prevent
caps from overturning, each of them has a tubular distance piece only
on one side. The cap transverse fixation is ensured by vertical slots in
the block.
CYLINDER BLOCK AND CYLINDER LINERS
BASIC PARTS
53