TM 5-4240-501-14P
IGNITION
FLYWHEEL TYPE—INTERNAL BREAKER
NOTE: Always clean breaker points after adjustment.
Open the points and insert a piece of lintless paper.
Draw the paper through the points. Open points when
removing paper so it will not tear, leaving paper between
the points.
Breaker Point Cover
The breaker point cover, Fig. 21, protects the points from
dirt. The opening for the primary and/or ground wire
should be sealed with No. 2 Permatex" or similar sealer
to prevent dirt from entering the breaker box. Cover
should not be distorted so as to lose its seal around the
outer edge. Replace if damaged.
NOTE: Engines used for winter applications use vented
breaker covers. See Engine Parts List.
Fig. 21 - Breaker Point Cover
Install Armature
Install governor blade and armature, Fig. 22. The
mounting holes in the armature laminations are slotted.
Push armature up as far as possible and tighten one
mounting screw to hold armature in place.
Fig. 22 - Install Armature and Governor Blade
Adjust Armature Air Gap
Three styles of armatures have been used (Fig. 23, Illus.
1, 2 and 3). Set air gap between the flywheel and
armature as shown in Table 1. With armature up as far
as possible, and one screw tightened, slip the proper
gauge between armature and flywheel. Fig. 24. Turn
flywheel - until magnets are directly below the armature.
Loosen the one mounting screw and the magnets should
pull the armature down firmly against the thickness
gauge. Then tighten the mounting screws.
Fig. 23 - Armature Style Variations
Fig. 24 - Adjusting Armature Air Gap
FLYWHEEL KEY
Inspect key for partial shearing. If sheared, replace.
Check flywheel and crankshaft keyways for damage. If
damaged, replace with new parts.
Install Flywheel, Nut and/or Starter Clutch
Remove all oil or grease, clean flywheel hole and
tapered end of crankshaft before assembling flywheel to
shaft. Insert zinc key into keyway. Slip spring washer
over crankshaft with hollow side toward flywheel. To
tighten flywheel nut or starter clutch, reverse removal
operation. See "Remove Flywheel Nut or Starter Clutch."
Torque to specifications listed in Table No. 1.
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