Turn the governor cup so that the metal lined hole is at
the three o'clock position. The smooth side of the
governor yoke must ride against the governor cup.
Turn the governor arm and shaft clockwise as far as
possible and hold in this position until the gear cover
is installed flush against the crankcase. Be careful not
to damage the gear cover oil
seal.
GOVERNOR
CUP
With the gearcover removed, the governor cup can be
taken off after removing the snap ring from the
camshaft center pin, Figure 54; Catch the flyballs
while sliding the cup off.
WHEN GOVERNOR
IS PROPERLY
ASSEMBLED THE
DIMENSION SHOWN
ON DRAWING WILL
BE AS INDICATED
CAMSHAFT
GEAR
CENTER PIN •
SNAP RING —
1
GOVERNOR CUP
GOVERNOR FLYBALL
FIGURE 54. GOVERNOR CUP DETAILS
Replace any flyball that is grooved or has
a
flat spot. If
the arms of the ball spacer are worn or otherwise
damaged,
remove the spacer by splitting with a chisel.
Replace the spacer with a new one. The governorcup
must spin freely on the camshaft center pin without
excessive looseness or wobble. If the race surface of
the cup is grooved or rough, replace it with a new one.
When installing the governor cup, tilt the engine so
the gear is up, put the flyballs in place and install the
cup and snap ring on the center pin.
The camshaft center pin extends out 3/4-inch from
the end of the camshaft. This distance provides an in
and out travel distance of 7/32-inch for the governor
cup,
as illustrated. Hold the cup against the flyballs
when measuring. If the distance is less (the engine
may race, especially at no load), remove the center
pin and press a new pin in only the required amount.
Otherwise, grind off the hub of the cup as required.
The camshaft center pin cannot be pulled outward
nor removed without damage. If the center pin
extends out too far, the cup will not hold the flyballs
properly.
PISTON
AND
RINGS
Whenever there is a noticeable wear ridge at the top of
each cylinder, remove the ridge before removing the
pistons. If not, the rings can catch the ridge when
pushing out the pistons and cause a ring land
fracture. See Figure 55.
FIGURE 55. REMOVING WEAR RIDGE
To remove the piston and connecting rod assemblies;
turn the crankshaft until a piston is at the bottom of
the stroke. Remove the nuts from the connecting rod
bolts.
Lift the rod bearing cap from the rod and push
the rod and piston assembly out the top of the
cylinder with the handle end of a hammer. Be careful
not to scratch the crankpin or the cylinder wall when
removing these parts.
Keep the connecting rod bearing caps and bearings with their
respective rods.
The pistons are fitted with two compression rings and
one oil control ring with an expander. Remove these
rings from the piston using a piston ring spreader.
Clean thepiston ringgrooves with a groove cleaner or
the end of a broken ring filed to a sharp point. All
passages should be cleaned with a non-caustic
solvent. Clean the rod bore and the back of the
connecting rod bearings thoroughly.
Mark each piston to make sure the rod will be
assembled on the piston from which it was removed.
Remove the piston pin retainer from each side and
push the pin out.
Inspect the pistons for fractures at the ring lands,
skirts and pin bosses. Check for wear at the ring land
37
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