4
WHEN GOVERNOR
IS
PROPERLY
ASSEMBLED
THE
DIMENSION
SHOWN
ON
DRAWING
WILL
BE
AS
INDICATED
CENTER
PIN
,
RIGHT
WRONG
INSTALLATION
OF
BALL
SPACER
G1107
5
BALL
GOVERNOR
6
BALL
GOVERNOR
8
BALL
GOVERNOR
SI238
FLYBALL LOCATIONS
FIGURE
61.
GOVERNOR
CUP
DETAILS
GOVERNOR
CUP
With the gear cover removed, the governor cup can be
taken
off
after removing the snap ring from the camshaft
center pin. Catch the flyballs while sliding the cup
off
(Figure 61).
Replace with a new part any flyball which is grooved or
has a flat spot; the ball spacer if its arms are worn or
otherwise damaged; the gearispacer assembly if loose
on gear hub, and the governor cup if the race surface is
grooved or rough. The governor cup must be
a
free-
spinning fit on the camshaft center pin, but without any
excessive play.
If replacing the ball spacer, be sure to position
it
so
an
arm
is
lined up with the space on the camshaft gear (if
your camshaft gear does not have a space in it,
disregard this paragraph). If the ball spacer arm is not
lined up with the space in the camshaft gear,
a
flyball
can slip into the space and cause engine racing and
governing problems (Figure
61).
When installing the governor cup, tilt the engine
so
the
gear is up, put the flyballs in place (Figure61), and
install the cup and snap ring on the center pin.
The camshaft center pin extends out
3/4
inch
(19
mm)
from the end of the camshaft. This distance provides an
in-and-out travel distance of 7/32 inch
(5.6
mm) for the
governor cup, as illustrated. Hold the cup against the
flyballs when measuring. The camshaft center pin
cannot be pulled outward or removed without damage.
If the center pin extends out too far, the cup will not hold
the flyballs properly. If the distance is less than 7/32“
(5.6 mrn), (the engine will race, especially at no load)
remove the center pin and press in a new pin.
TIMING
GEARS
If replacement of either the crankshaft gear or the
camshaft gear becomes necessary, always install both
gears new.
The camshaft and gear must be replaced as an assembly.
Before removing the camshaft and gear assembly,
remove the cylinder head and valve assemblies. Then
remove the operating plunger for the breaker points and
tappets.
To
remove the crankshaft gear, first remove the snap
ring and retainer washer, then attach the gear pulling
ring using
two
No.
10-32 screws (Figure 62). Tighten
the screws alternately until both are tight. Attach a gear
puller to the puller ring and proceed to remove the gear.
Each timing gear is stamped with
“0
near the edge. The
gear teeth must mesh
so
that these marks exactly
coincide when the gears are installed in the engine.
When installing the camshaft gear and shaft assembly,
be sure that the thrust washer
is
properly in place
behind the camshaft gear. Then install the crankshaft
retaining washer and lock ring.
45
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