GMC 1976 ZEO 6083 Maintenance Manual page 690

ROTATE
GOVERNOR CUP
SO THAT ROLL PIN'
FITS INTO THE
METAL LINED
HOLE IN THE CUP
GOVERNOR
SHAFT YOKE
(Smooth Side
Toward Cup)
A-1598
The camshaft center pin extends out 3/4" from
the end of the camshaft . This distance provides an in
and out travel distance of 7/32" for the governor
cup, as illustrated in Figure 10 . Hold the cup against
the flyballs when measuring. If the distance is less
(the engine will race especially at no load), replace
camshaft . 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 .
WHEN GOVERNOR
IS PROPERLY
ASSEMBLED THE
DIMENSION SHOWN
ON DRAWING WILL
BE AS INDICATED
A-1599
Figure 10-Governor Cup (Cross-Section)
Figure 9-Gear Cover Assembly
ONAN MOTOR GENERATOR
24C- 1 3
TIMING GEARS
If replacement of either the crankshaft gear or
the camshaft gear becomes necessary, always install
both gears new.
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 11).
Tighten the screws alternately until both are tight.
Attach a gear puller to the puller ring and proceed
to remove the gear.
The camshaft and gear must be replaced as an
assembly . Before removing the camshaft and gear
assembly, remove the cylinder head and valve assem
blies. Then remove the operating plunger for the
breaker points and tappets.
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 assem-
bly, be sure that the thrust washer is properly in
place behind the camshaft gear. Then install the
crankshaft retaining washer and lock ring .
PISTONS AND CONNECTING RODS
REMOVAL
Observe the following procedure when removing
pistons and connecting rods from the engine .