Breaker Point And Electronic Ignition Coils - Onan T260G Service Manual

T h e ignition timing is preset at the factory and is not
adjustable. For troubleshooting purposes, it is possible
to make an approximate check of the ignition timing by
removing blower housing and using the gearcase
timing marks.
FLYWHEEL TIMING
(TC)
MARK
M-1397
FIGURE 4. IGNITION TIMING MARKS
Continuity Test
1. Pull spark plug wires off spark plugs and remove
spark plugs and blower housing.
CAUTION
b e f o r e
failure to remove spark plugs
result in engine starting, which may cause severe
personal injury.
before turning engine over may
2. Turn ignition on.
3. Connect a voltmeter between the negative coil
terminal (larger diameter of the two threaded posts)
and a good engine ground.
WARNING
The electronic ignition will
plugs even when rotated by hand. Care should be
taken to avoid an electrical shock from the spark
deliver full voltage to the spark
plugs.
4. Rotate the flywheel slowly by hand in the clockwise
direction until the voltmeter reading jumps from
approximately 1 volt to battery voltage. At this point
the flywheel timing mark should line up with the
proper timing degree (see SPEClFlCATlONS) mark
located on the gearcase timing marks. To recheck
timing, the flywheel must be rotated another com-
plete revolution in the clockwise direction. Moving
the flywheel back and forth across the timing marks
will not activate the electronic ignition control.
5. Install spark plugs, wires, and blower housing.
BREAKER POINT AND ELECTRONIC,
IGNITION COILS
To test primary and secondary windings within the
ignition coil first make sure the ignition power is off and
coil is at room temperature of 70°F (21 "C).
1. Use, a Simpson 260 VOM or equivalent.
2. Place a black lead on the negative coil terminal
and a red lead on the positive coil terminal.
Primary resistance should read between 3.87-4.73
o h m s for breaker point coils, and between 2.90-3.60
for electronic ignition coils.
3. Change resistance setting on ohmmeter. Place
ohmmeter leads inside on spark plug cable holes
(Figure 5). Secondary resistance should read
between 12,600-15,400 ohms for breaker point
ignition coils, and between 14,500-19,800 ohms for
electronic ignition coils.
4. If any of the above conditions are not met, replace
coil.
O H M M E T E R
FIGURE 5. COIL TEST