Adjustments - Onan 3.0 AJ Operator's Manual

ADJUSTMENTS
TIMING AND BREAKER POINTS
Ignition points should break contact at 22°BTC (see
Figure 4). Proper 22° BTC timing is obtained by
setting breaker points and checking with a timing
light.
22° BTC timing can be checked at timing hole on the front of blower
housing ("D") or at another timing hole on the side of the blower
housing ("C") just above the governor adjustment. Breaker point
setting may vary from .017-.024 inch to get proper 22° BTC timing.
1. Turn engine over slowly in a clockwise direction
until the TC mark appears in the middle of the
window "D" (Figure 4). Turn slightly beyond this
point to ensure points are fully open.
2. Remove cover on breaker point box, loosen
screws "A" and turn cam "B" to obtain .020 inch
setting. Use a clean, flat feeler gauge.
3. Retighten screws "A", replace breaker box cover
and connect a timing light. With unit running and
warmed up, notch should appear In timing
reference hole "C". (If front of blower scroll is
accessible, direct the timing light to small hole
"D". 22° BTC mark should appear in this hole.)
CARBURETOR
Initial Adjustment
Adjust initially by turning idle and main (load)
adjustment screws gently onto their seats. Then back
off idle screw 1-1/4 turn and main screw 1-1/4 turns.
This adjustment will allow initial starting of the
generator set.
Adjustment
1. Start unit and allow it to warm up.
2. Remove all AC loads from the generator set.
3. Connect a voltmeter to the AC leads or use a plug¬
in voltmeter inserted into one of the receptacles.
Hold governor arm to minimum speed and adjust
the throttle stop screw so voltmeter indicates 75-
80 volts.
4. With voltmeter still connected, hold governor arm
against throttle stop and turn idle adjustment
screw in until voltage drops. Then turn it out until
the highest voltage is obtained. Release governor
arm. Engine should accelerate to governed speed
and become stable.
NOTCH REFERENCE
TIMING HOLE
FIGURE 4. IGNITION AND TIMING ADJUSTMENTS
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