4-3
CRANKSHAFT
The crankshaft
is
forged of carbon steel, and the crankpin
is
induction-hardened. It has a crank gear premred-fitted on the
output end.
(See
Fig.
5.).
"he
EY
15B
type has a built-in drive sprocket. (See Fig.
6.)
Induction Hardening
(Portion
of
Crankpin)
Crank Gear
(Pressure-Fit)
Drive Sprocket
-
Fig.
5
Fig.
6
(E
Y
158)
4-4
CONNECTING
ROD,
PISTON
and
PISTON
RING
The connecting rod is forged of aluminum alloy, which it-
self serves as bearings at both the large and
small
ends. The
large end
has
a
built-in
oil
scraper for splashing the lubri-
cating
oil.
The piston is cast of aluminum alloy, and has grooves for
receiving two compression
rings
and one
oil
ring.
(See
Fig.
7.)
PISTON RINGS
for
EY28 ENGINE
This piston rings are made of special cast iron
and
the
shape
of
the top ring
is
barrel face, that of second
ring
is
taper under cut; and the
oil
ring has cutter expander. These
rings are very much effective for decreasing engine
oil
consumption.
Connecting
Rod
Rod
Lock
Washer
Oil Scraper
1
Fig.
7
-5-
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