Onan CCKA User Manual

GOVERNOR CUR
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.
WHEN GOVERNOR
IS PROPERLY
ASSEMBLED THE
DIMENSION SHOWN
ON DRAWING WILL.
BE AS INDICATED
CENTER PIN-
snap ring
GOVERNOR CUP
GOVERNOR FLYBALL
new, never one only. Use a gear pulling ring (number
420-0248) to remove the crankshaft gear. Be sure to
remove the snap ring first
The camshaft gear is pressed on and keyed to the
camshaft. The camshaft and gear must be removed as
an assembly after first removing the crankshaft gear
lock ring and washer. Before removing the camshaft
and gear assembly, remove the cylinder head and
valve assemblies. Remove the operating plunger for
the breaker points. Remove the fuel pump and
tappets.
The camshaft may be pressed out of the gear by useof
a hollow tool or pipe which will fit over the camshaft
center pin. Do not press on the center pin or damage it
in any way. The governor ball spacer is a press fit to
the camshaft gear.
When pressing a camshaft gear onto thecamshaft, be
sure the gear is started straight and that the key is
properly in place. When replacing the cam gear on
units having automatic spark advance mechanisms,
remove the spark advance mechanism and put blocks
beside the pins to avoid damage when pressing on
cam gear. Install the governor cup assembly before
installing the camshaft and gear in the engine.
FIGURE $1. GOVERNOR CUP
Replace any flyball that is grooved or has aflat spot If
the arms of the ball spacer are worn or otherwise
damaged, replace the entire timing gear set. The
governor cup 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. Figure 61.
Thecamshaftcenterpinextendsout3/4inch(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 dam¬
age. If the center pin extends out too far, the cup will
not hold the flyballs properly. If the distance is less
than 7/32 inch (5.6 mm), (the engine will race, espe¬
cially 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, install both gears
THESE MARKS MUST
ALIGN WHEN INSTALL¬
ING TIMING GEARS.
FIGURE 62. TIMING GEAR REMOVAL
AND INSTALLATION
54

Onan CCKA Specifications

General

Cylinders	2
Ignition System	Battery ignition
Engine Type	4-cycle
Bore	3.25 in (82.55 mm)
Power Output	Varies with model. e.g., 6.5 kW (CCK)
Horsepower	10 hp
Starter	Electric