CYLINDER
BLOCK
CONSTRUCTION
The special iron casting cylinder block is
of
a full jacket
type in which cylinder liners are integrated with the cylinder
block.
CYUNDER
BLOCK
The main bearings are made
of
metal-backed copper sin-
tered alloy (Kelmet) and an aluminum alloy. To improve run-
in characteristics, they are coated with a lead-tin alloy plating
on the journal surface, and tin flash-plating on the journal
surface and tin
flash~plating
over the entire bearing surface.
Crankshaft thrust is received by the flanged center bearing.
On the front bearing area
of
the camshaft, a metal-backed
special copper alloy rolled bushing is
pre!?sfitted.
The crankshaft is a precision-forging
of
carbon steel, which
is supported by five bearings to provide high rigidity.
Journals, pins and oil seal contact areas are induction-hard-
ened to improve wear resistance and durability.
The flywheel is made
of
cast iron, and the ring gear is made
of
carbon steel and is shrinkage-fitted to the flywheel. The
gear teeth are induction-hardened.
The pistons are made
of
an aluminum alloy to reduce engine
weight and to decrease bearing load during high-speed opera-
tion. Each piston forms a tapered cylinder with elliptical
cross section contour so as to obtain the best contact with the
cylinder bore. The piston crown surface has a cavity to
improve fuel combustion.
The piston pins are hollow, carbonized forgings. When con-
necting a piston to its rod, a piston pin is press-fitted into the
small end
of
the rod.
The piston rings are made
of
special cast iron. Each piston is
provided with three compression rings and one oil ring. The
outside surfaces
of
the top compression rings and oil rings
are hard chrome plated. The top rings are
of
the semi-key-
stone type and the oil rings are provided with a coil
expander.
PISTON
&
PISTON
RINGS
The connecting rod has an I-beam cross section and a hori-
zontally split big end to provide high rigidity.
The big end bearing is made
of
a metal-backed special cop-
per alloy and is flash-plated all over.
The front piate
and
gear case. The steel front plate is posi-
tioned by a dowel pin located
in
the upper part
of
the
camshaft area and a dowel pin
in
the lower part
of
the injec-
tion pump area.
It is bolted to the cylinder block through a
gasket.
On the left end rear surface, the lube oil pump gear
bearing housing is installed together with the gear case. The
aluminum casting gear case is attached to the front end sur-
face
of
the cylinder block through the front plate. The case
houses the lube oil pump front bearing and the governor
related parts.
It serves also as a camshaft and idler gear thrust
stopper.
Engines & Generators
21
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