Onan CCKB User Manual

24 “-25° MARK
ON GEAR COVER
FIGURE 13. VACU-FLO TIMING MARKS
3. Turn in the main fuel adjustment screw (Figure
14) until engine speed drops. Then turn out screw
until engine speed returns to normal.
3. Remove load from the engine.
4. Turn the idle adjustment screw out until engine
speed drops slightly. Then turn the screw in until
speed returns to normal.
Carburetors equipped for gaseous fuel operation only are identical
to the carburetor shown in Figure 14, except the parts not
necessary for gaseous fuel operation (the choke, gasoline adjust¬
ment screws, and the float assembly) have been removed.
Loosen packing nut before turning gasoline
main adjustment and tighten to a snug fit after
adjustment has been made. Hold the adjustment while tightening
packing nut. This procedure will prevent air entry that causes rough
engine operation and fuel leaks. The fuel leaks occur when the
engine is not running and cause difficult starting because the float
level is lowered.
Mixture Screws Adjustment
The same adjustment procedures are used whether
the carburetor is operating on gasoline or gaseous
fuel. Carburetors running on gaseous fuel are factory
set for gas rated at approximately 1000 8TU. Ifthefuel
rating to be used is substantially different, a readjust¬
ment of the fuel mixture is required. To set the
adjustment screws, proceed as follows:
1. Start the engine and allow it to warm up (on
gasoline fueled engines, allow to warm until
choke is fully open).
2. Apply a full load to the engine.
Alternate Method (No Load Adjustment)
1. Start the engine and allow it to warm up.
2. Push in on the governor mechanism to slow the
unit down to about 400 to 500 rpm.
3. Release the governor mechanism to allow the
engine to accelerate. If the engine accelerates
evenly and without a lag, the main adjustment
screw setting is correct. If not, adjust the screw
outward about 1/2 turn and again slow down the
engine and release the mechanism. Continue
until the engine accelerates evenly and without a
time lag after releasing the governor.
4. Push in on the governor mechanism to slow the
unit to 400 to 500 rpm. Set the idle adjustment
screw so the engine is firing on both cylinders and
running smoothly.
FIGURE 14. GAS-FUELED CARBURETOR ADJUSTMENTS
13

Onan CCKB Specifications

General

Engine Model	CCKB
Fuel Type	Gasoline
Cooling System	Air-cooled
Phase	Single-phase
Governor Type	Mechanical
Rated RPM	1800 RPM
Frequency	60 Hz
Ignition System	Battery Ignition
Starting System	Electric
Voltage	120/240 V
Rated Output	4.0 kW (5.0 kVA)
Maximum Output	5.5 kW
Oil Capacity	2 quarts
Generator Type	Revolving field
Fuel Consumption at Full Load	0.75 GPH
Fuel Consumption at Half Load	0.4 GPH