Generac Power Systems GTH760, Service Manual

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SeCTIoN 2: IGNITIoN
GROUND WIRE ROUTING
Figure 2-6. Installing Ignition coil
ADJUST IGNITION COIL AIR GAP:
1. Rotate flywheel until magnet is under ignition coil
laminations.
2. Place 0.20-.30 mm (.008"-.012") thickness, non-magnetic
gauge between magnet and ignition coil laminations,
Figure 2-7.
3. Loosen mounting screws so magnet will pull ignition coil
down against thickness gauge.
a. Torque screws to 4.75 Nm (40 in. lbs.).
0.20-0.30mm SHIM
GROUND WIRE TERMINAL
SOCKET
WRENCH
Figure 2-7. Adjusting Air Gap
4. Rotate flywheel to remove thickness gauge.
5. Repeat for second ignition coil.
Note: Route ignition coil ground wire under breather
tube and away from the flywheel (see Figure 2-9).
FlYwHeel
REMOVE FLYWHEEL:
1. Remove two screws that attach fan and fan retainer
to flywheel.
2. Remove fan retainer and fan.
3. Remove flywheel nut and washer, Figure 2-8.
4. Reinstall flywheel nut. Turn nut down flush with top of
threads.
5. Install flywheel puller.
6. Tighten puller screws equally until flywheel loosens,
Figure 2-9.
Figure 2-8. Removing Flywheel Nut
*
Caution: Flywheel puller bolts may damage lighting
coil if turned in too far.
*
Caution: do NoT strike flywheel with a hard object
or a metal tool as this may cause flywheel to shat-
ter in operation. Always use approved flywheel
removal tools.
INSPECT FLYWHEEL KEY, KEYWAYS, FLYWHEEL AND
CRANKSHAFT:
Check flywheel key for damage. Check flywheel for cracks or
keyway damage. Also check crankshaft keyways and taper for
damage, Figure 2-10. Replace crankshaft, if damaged.
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