4-5
CAMSHAFT
In
the
D
type, the camshaft
is
integrally built with a cam gear
of
special cast iron, and has intake and exhaust cams. Also
the camshaft has aluminum
plain
bearings attached to both ends.
(No
ball bearing is used.) (See Fig.
8.)
In
the
B
type, the camshaft is made of carbon steel, and
EYlSB
type has a pressured-fitted cam gear and a driven sproket.
(See Fig.
9.)
The camshaft functions also as an output shaft, and is driven by
1/2
rotation
of
the crankshaft,
Ball
bearings
are used
in
the output shaft side.
J
Fig.
8
4-6
VALVE ARRANGEMENT
The exhaust vahe is located upstream
of
the coolingair with
the result that the exhaust valve
is
intensiveiy cooled
for
improved engine durability. The inner side
of
the valve head
is reinforced with hard alloy fused to it for added durability.
(See Fig.
10.)
Driven Sprocket
(Pressure-Fit)
Cam
Gear
Fig.
9
(E
Y
156)
I
Exhaust Valve
Direction
of
Cooling
Wind
Fig.
70
-6-
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