Onan CCKB User Manual

ADJUSTMENTS
BREAKER POINTS - TIMING
For best engine performance, it is essential that the
breaker point gap and the ignition timing are correctly
set. Timing should always be checked when the
breaker points are adjusted or replaced. Always
replace breaker points that are burned or pitted.
Breaker Points
To check the breaker point gap, remove the breaker
box cover and crank the engine slowly by hand in the
direction of crankshaft rotation (clockwise as viewed
from engine front) until the points just start to open.
Continue turning until the points are fully separated
(about 1/4 turn). Using a clean, flat thickness gauge,
check for a proper separation of .020 inch (0.51 mm).
To adjust the gap (Figure 11), loosen locking screws
(A) and turn the off-center screw (B) until separation
is correct. Retighten the locking screws (A) and
recheck gap.
FOR MODELS WITH BREAKER BOX
FACING REAR OF ENGINE
^ -ADVANCE SPARK
retard spark-
PLACE A DROP OF
LIGHT OIL ON
BREAKER ARM PIVOT
SHAFT EVERY 200
OPERATING HOURS
To adjust gap
loosen screws A
turn cam B.
SET BREAKER POINT
GAP AT 0.020 '' (0.51 mm)
LOOSEN THE SCREWS
TO ADJUST POSITION OF
BREAKER BOX
REFERENCE MARK
FIGURE 11. BREAKER POINTS
Timing
The ignition timing marks can normally be viewed
through the blower housing on thef ront of the engine.
Align the timing mark stamped on the flywheel with
the marks stamped on the gear cover (Figure 12). If
more than one mark is stamped on the flywheel, align
the TC mark on the flywheel with the gear cover
marks. Engines equipped with Vacu-flo cooling have
a removable dot button on the blower housing for
viewing timing marks (Figure 13).
To check the ignition timing with the engine not
running, connect a continuity tester across the
breaker points. Turn the engine against crankshaft
rotation (counterclockwise as viewed from engine
front) until the points close (tester shows continuity).
Then slowly turn the engine with rotation until
continuity just ceases (points are just opening). At
this setting, the timing pointer should align with the
correct timing mark.
To check the ignition timing with the engine running,
connect an automotive timing light to either spark
plug and start the engine. With the engine running at
rated speed, the timing mark on the flywheel should
align with the correct timing mark on the gear cover.
To change the timing setting, loosen the two breaker
box mounting screws and slide the breaker box
assembly to advance or retard the ignition spark
(Figure 11).
CARBURETOR ADJUSTMENTS
Before attempting carburetor adjustments, makesure
the ignition system, choke, and governor are all
functioning properly. If the carburetor is completely
out of adjustment so the engine will not start, a
reasonably close preliminary setting can be obtained
by turning the adjustment screws in until lightly
seated and then turning them out 1 to 1-1/2 turns (3
turns for gaseous fueled carburetors operating on 800
BTU fuel). Do not force the screws tight against their
seats or damage may occur.
If operating on gas fuel with the gas-gasoline car¬
buretors, be sure to lock the electric choke open
(where used).
12

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