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CRANKCASE
Construction of Crankcase
Crankcase
The crankcase is of the full-jacket type, made of cast iron alloy and
formed integral with the cylinders.
The main bearing is of the bushing type, made of special copper alloy
with
back
metal
and
is
flash-plated.
The
crankshaft
thrust
is
received and maintained by the front bearing housing.
Crankshaft
The
crankshaft
is
a
high
carbon
steel
precision
forging,
and
the
ma1n
bearings and connecting rod
journals
are
induction-
hardened
to
increase
the
wear
resistance.
The
balancer is formed integral
with the crankshaft.
Flywheel and Ring Gear
The flywheel is designed to provide a great inertial efficiency and to
minimize torque variation.
The ring gear
is shrink-fitted to the
flywheel,
and
gear
teeth
are
induction-hardened
to
increase
their
resistance to wear.
Piston, Piston Pin and Piston Ring
The piston is made of special light alloy and is elliptic and tapered
(getting smaller upward) to provide the best contact with the cylinder
bore.
The piston pin is a hollow, special alloy steel pin and is carburized
throughout the surface.
The piston pin is pressed into the connecting
rod and fixed by use of a special fitting tool.
Each piston
is
provided
with
four
piston rings,
three compression
rings and one oil ring.
No.
1
ring and oil ring are hard chrome-
plated on the surface in contact with the cylinder.
44
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