Onan CCK - Performance Adjustments

ADJUSTMENTS
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BREAKER POINTS
1. Remove the two screws and the cover on the
breaker box.
2. Remove the two spark plugs so engine can be
easily rotated by hand.
3. Turn flywheel in a clockwise direction ap¬
proximately 1/4 turn after top center (TC).
4. To adjust gap refer to Figure 15. Loosen screws
(A) and turn cam (B) until point gap measures
.020-inch with a flat thickness gauge. Retighten
screws (A) and recheck gap.
5. If points appear to be burned and pitted, replace
them with a new set.
6. Replace spark plugs and breaker box cover.
IGNITION TIMING
Both spark plugs on the CCK fire simultaneously,
thus the need for a distributor is eliminated. Spark
advance is set at 19° BTC (before top center) and
should be maintained for best engine performance.
Always check timing after replacing ignition points or
if noticing poor engine performance. Proceed as
follows:
Timing Procedure—Engine Running
1. To accurately check the ignition timing, use a
timing light when the engine is running . Connect
the timing light according to its manufacturer’s
instructions. Either spark plug can be used as
they fire simultaneously.
2. Remove the plug from the timing hole (Figure 16).
3. Start the engine and check the timing. The mark
on the flywheel should line up with the 19° BTC
mark on the cover.
4. If timing needs adjustment, loosen the mounting
screws on breaker box and move left to advance
or right to retard the timing.
5. Start engine to be sure mark on flywheel lines up
with 19° mark on cover.
6. Tighten all screws; replace timing plug.
Timing Procedure—Engine Not Running
1. Connect a continuity test lamp set across the
ignition breaker points. Touch one test prod to
the breaker box terminal to which the coil lead is
connected and touch the other test prod to a good
ground on the engine.
2. Turn crankshaft against rotation (coun¬
terclockwise) until the points close. Then slowly
turn the crankshaft with rotation (clockwise).
3. The lamp should go out just as the points break
which is the time at which ignition occurs
(19° BTC).
PLACE A DROP OF
LIGHT OILON
BREAKER ARM PIVOT
SHAFT EVERY 200
OPERATING HOURS
TO ADJUST GAP
LOOSEN SCREWS ®
TURN CAM (§)
RETARD SPARK —
— ADVANCE SPARK
SET BREAKER POINT
GAP WIDTH AT 0.020’
LOOSEN THESE-
SCREWS TO ADJUST
POSITION OF
BREAKER BOX f
REFERENCE MARK
FIGURE 15. BREAKER BOX AND TIMING MARK
FIGURE 16. TIMING ACCESS HOLE
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