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Crankshaft
Flywheel
and
ring gear
The
flywheel
is
made
of
a cast iron.
The
pilot
bearing for holding the
clutch
main
shaft
end
is
a ball bearing.
The
ring gear
is
made
of
a
carbon
steel and
shrink-fitted to
the
flywheel; its gear
teeth
are
induction-hardened.
Pistons,
piston
pins
and
piston
rings
The
piston
is
an aluminum-alloy die casting,
and possesses a minimized inertial mass so
that
the high-speed load
on
the
main
bearings
is
greatly reduced. Its
diameter
is
cam-ground and
tapered
to
optimize its fit in
the
bore when
the
block comes up
to
the
normal
operating
temper-
ature.
The
piston pin
is
a hollow forging, whose
finished surface
is
casehardened
by
carburization;
it
rotates in
the
piston
but
press-fitted
into
the
connecting rod,
thereby
presenting a semi-float-
ing
type
of
small
end
connection.
Piston
and
piston
pin
The
three compression rings are
of
a special
cast iron.
The
top
ring (compression) and oil
ENGINE
ring are plated with
hard
chromium
at
their
sliding faces.
Piston
and
piston
rings
Connecting rods
The
connecting
rod
has its big end split
horizontally
and
its
shank
forged
into
"I"
shape
in cross section for greater rigidity.
The
bearing
in
the
big end
is
of
the
same tri-metal
type
as
the
main bearings.
The
bearing shells are flash-plated.
®
Connecting
rod
Front
plate
and
gear case
The
front
plate
is
bolted
to
the cylinder
block;
it
is
a steel plate, located in place by a
positioning pin above the camshaft gear
and
another
pin below
the
injection
pump
gear. A
gasket
is
used between this plate and
the
block.
To
the
left-hand rear face
of
this plate
is
secured
the
hydraulic
pump
gear bearing housing
together
with
the gear case.
The
gear case
is
an aluminum casting secured
to
the
front
plate, and houses the
front
b~aring
for
the
hydraulic
pump
gear and also
other
parts
associated
with
the
governor.
It
should
be
noted
that
the gear case serves also
as
stoppers
for
the
camshaft and idle gear.
2-7
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