TM 5-3810-288-12
three and remove electrical leads and the two mounting
screws and lockwashers. Then remove the magnetic
switch.
d. Distributor (Ignitor). The distributor on this machine
is called an ignitor, since both the distributor and the ignition
coil are combined into one unit. Replace a defective
distributor as follows:
Figure 3-42. Arrangement of exhaust and intake valves
(1) Removal.
(a) Refer to paragraph 3-49f and remove
suppression leads from spark plugs. Disconnect the
primary lead from the distributor and the ground strap from
the engine. Refer to figure 3-53.
(b) Refer to figure 3-53 and remove hold down
screws and clamps. Lift distributor from the tachometer
drive.
(2) Replacement.
(a) Breaker point adjustment. The breaker
points must be accurately adjusted for clearance. Refer to
before the distributor is installed on the engine. Remove
cover screws and remove the metal cover from distributor
on the high point of the cam (fig. 3-54) Loosen the clamp
screw (fig. 3-54) slightly. Ad- just breaker point clearance
by turning the ec0centric screw. Check clearance with a
0.022 inch round feeler gage. Tighten fixed breaker point
clamp screw. Turn shaft so that breaker points are closed.
Inspect breaker point alinement. Bend fixed point bracket
so that points are alined for full face contact. Check and
readjust breaker point clearance if necessary.
(b) Distributor installation. Turn the engine to firing
TDC (top dead center) position on the compression stroke
for number one cylinder as shown in figure 3-41. Install the
rotor and turn it so that it is pointing to the number one
suppression lead contact in the distributor cap. Insert the
drive shaft in the tachometer drive opening with the
distributor body held approximately the same as it was
when removed. Do not allow the shaft to turn. Install
Figure 3-43. Adjusting valve tappet clearance.
clamps and hold down screw (fig. 3-53) and tighten the
screws finger tight. Connect the primary lead to the
motor, since their purpose is to provide reduced
distributor and the ground strap to the engine.
starting power by cutting in one at a time. The
magnetic switches are electrically located in fig 1-14.
(c) Distributor timing. The timing of the spark depends
One magnetic switch is located beneath the
on the breaking of electrical con-
starting motor and the other on a bracket above the
flywheel housing, as shown in figure 1-8. Removal
and replacement procedures are the same for both
switches. Refer to figure 3-52, part
3-49
