Generac 86640 - Manual (Page 82)

Section 8.2- TESTS, CHECKS AND ADJUSTMENTS
Ignition Coil
See Figure 3. Connect the test leads of an ohmmeter
across the positive and negative terminals of the primary
v/inding. Measure the resistance.
PRIMARY WINDING RESISTANCE
AT 68* F. (20‘ C.)
1.3-1.5 ohms
Connect the ohmmeter test leads across the secondary
winding terminal and the primary winding negative terminal.
Measure the resistance.
SECONDARY WINDING RESISTANCE
AT 68* F. (20* C.)
8700-11,700 ohms
Figure 4. Checking Secondary Winding Resistance
Checking the Condenser
Use a capacity tester to check the condenser. If a capac­
ity tester is not available, avolt-ohm-milliammeter(VOM) may
be used to test the condenser, as follows:
1. S^t the VOM to a high resistance scale, such as *Rx1 K" or
”Rx10,000". Zero the meter.
2. Connect VOM test leads across the condenser. If the VOM
needle swings violently, then moves back to “Infinity" grad­
ually, condenser is good. A reading of “zero” or a steady
reading indicates the condenser has failed.
Distributor Cap and Rotor Head
Inspect the cap and rotor head for dust, carbon deposits,
cracks. Replace, if necessary.
Contact Set
Inspect surfaces of the contact points. Irregularities may
be rernoved with No. 500 or 600 sandpaper or with oilstone.
Loosen the breaker point set screw and adjust gap with a
feeler gauge.
BREAKER POINT GAP
0.018-0.022 Inch (0.45-0.55mm)
Check Governor Advance
Turn the rotor shaft counterclockwise, then release it and
check that it returns to the clockwise position. Also check that
the rotor shaft is not excessively loose.
2. Use a spark plug wrench to remove spark plugs.
3. Clean the spark plugs in a sand blast cleaner. Inspect
insulators for cracks, chipping. Inspect gasket. Check elec­
trode for wear, burning or pitting. Replace plug(s) if defective.
4. Check spark plug gap (Figure 7).
SPARK PLUG GAP
0.031-0.035 inch
5. Install and tighten to 14-22 foot-pounds. Install wires.
Page 8.2-1