Onan MJA Series Service Manual page 89

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ENG rNE DTSASSE MBL Y ..87
2. Turn governor yoke
50
the smooth side ,is toward governor cup.
3. Turn the gevernor cup so the stop pin in the gear cover will fit into
one of the holes in the cup surface, :Fig3. 9. B. Measure the dis""
tance from the end of the stop pin to the mounting face of the cover.
n
should be 25/32 in.
If
it isn't, replace the .
4. Use the oil seal driver or a piece of shim stock over the crank­
shaft keyway to protect the oil seal and install the gear cover.
Tighten the mounting screws to specified torque. Before tightening
the screws. be sure the stop pin is in the governor cup hole.
5. Install and retimethe ignition points (start-disconnect centrifugal
switch onM.JC). Sect 3. 3.
3.9.3 GOVERNOR CUP
ToremO\'e the governer cup. remove the snap ring fr0m the camshaft
center pin and slide the cup off .Be sure to catch the 10 flyballs that
williall out when the cup is removed.
3:.9. 3.. 1 Repair. - Replace any
flyballs that have flat spots or
grooves. Replace the cup
if
the race surface is grooved or
PROPERLY ASSEMBLED
DI'ME'NSION SHOWN
OWDRAWIN.(; WILL BE
A5INDICATED---
CENTER ·PIN
GOVERNOR FLY BALL
r'~"ln--CA'"
SHArT
GEAR
WHEN GOVERNOR IS
rough. The :governor cup must
THE
be a ireespinning fit on the
camshaft center pin, butshould
be replaced if excessively loose
er
Check the distance the center
extends from the camshaft
gear. This distance must be
25/32 to give the proper travel
distance .for the cup. If it is
less, the engine may race;
if
more, the cup won't hold the
baUs properly. If the distance
is too great, drive or press the
center pin in.
If it
is too small,
.replace the pin:
it
can't be removed without damaging the surface. In
some cases. if the distance is too small, the head of the governor cup
can be ground to the necessary 7/32 in. travel distance.
3.9.3:.2 Installation. - To install the governor assembly. tip the front
of the plant upward. Set the flyballs in their recesses and position the
governor cup on its shafLFinally, install the snap ring on the center