4-2
MAIN BEARING COVER
The main bearing cover is an aluminum diecasting, which is mounted on the output shaft side of the crank-
case. Remove the main bearing cover to expose the inside
of
the engine for inspection.
n
The main bearing cover also serves
as
an oil pan, with a trochoid oil pump, oil filler and oil drain plug. (See
Figs.
2
and
3.)
Fig.
2
4-3
CRANKSHAFT
The crankshaft is forged carbon steel, and the crank
pin
is
induction-hardened. The output end of the
shaft has a crankshaft gear and balancer gear that are
pressed into position. (See Fig.
4.)
4-4
CONNECTING
ROD
and
PISTON
The connecting rod is forged aluminum alloy, and
its large and small ends serve as bearings. The piston
is
an
aluminum alloy casting, and carries two
com-
pression rings and one oil ring. The piston pin hole
is
offset from the center
of
the piston to reduce hit-
ting noise and improve durability.
(See
Fig.
5.)
Fig,
3
Induction Hardening
(Portion
of
Crankpin)
Crank Gear
(Press-fit)
Fig.
4
Fig.
5
-4-
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