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4.
GENERAL DESCRIPTION
OF
ENGINE
COMPONENTS
/"
ROBIN
EH63V/
65V
series engine is air-cooled, 4-stroke, twin-cylinder,
OHV
arrangement gasoline en-
gine. The twin-cylinder is located in the angle
of
90 degree;
#I
cylinder is in the
RH
side and
#2
cylinder
in
LH
side as viewed from flywheel (cooling fan) side.
4-1
CYLINDER
AND
CRANKCASE
The twin-cylinder and crankcase is single piece
aluminum die-casting.
The cylinder liner, made
of
special cast iron,
is
molded into the aluminum casting.
The crankcase has a mounting surface on the out-
put shaft side, where the main bearing cover is
attached.
4-2
MAIN
BEARING
COVER
Fig.
4-1
The main bearing cover is an aluminum die-cast-
ing, which
is
mounted on the output shaft side
of
the crankcase.
It
is
easy to inspect inside
of
the engine, after re-
moving the main bearing cover.
Fig.
4-2
4-3
CRANKSHAR
The crankshaft is
forged
carbon
steel, and the
crank pin is induction-hardened.
The output end of the shaft has a crankshaft gear
pressed into position.
Engine oil passages are provided onto the jour-
nal and pin
portions
of
crankshaft
for
lubrication.
I
Fig.
4-3
-
6-