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4-3
CRANKSHAFT
The crankshaft is forged carbon steel, and
the
crank
The output end of the shaft has a crankshaft gear, and
balancer gear for
EH25-2
which are pressed into
position.
W
pin is induction-hardened.
44
CONNECTING
ROD
AND
PISTON
The connecting rod is an aluminum alloy diecasting,
and
its
large and smalI ends function as bearings.
The piston
is
an aluminum alloy casting, and carries
two compression rings and one
oil
ring.
4-5
PISTON RINGS
The piston rings are made
of
special cast iron.
The profile of the top ring
is
barrel face and the
second ring has a tapered
face.
The
oil
ring consists
of
a cutter ring and a
coil
expander for better sealing and less oil consumption.
B
TYPE
D
TYPE
Fig.
4-3
I
fig.
4-4
TOP
RING
SECOND
RING
OIL
RING
fig.
4-5
-9-