TM 5-4320-218-15
Section VI. MAGNETO
(25) to the stationary contact. Remove the re-
93. Description
taining ring (24) and remove the contact arm
The magneto is designed to produce and dis-
and breaker arm wick (64).
tribute, to the spark plugs, correctly timed elec-
l. Remove the two screws (60 and 63) and
tric spark discharges of sufficient intensity to
the flat washer (62) that secure the stationary
fire the cylinders of the engine. An impulse
contact of the contact set (61) to the bearing
coupling automatically retards the timing of
support; remove the stationary contact and the
the ignition sparks to prevent engine back-
cam wick and holder.
firing, and intensifies the spark to facilitate
m. Remove the retaining ring (26) and the
starting.
rotor gear (27) from the rotor.
n. Remove the four screws (28) that hold
the bearing support (29) to the frame (39);
a. Remove the magneto as described in para-
remove the bearing support. Remove the re-
graph 66b.
taining ring (30) and remove the distributor
b. Remove the screws (7 and 8) that secure
gear. If damaged, remove the distributor
the end cap (73) to the frame (39); remove
bearing (23) and the cam end rotor bearing
the end cap and gasket (69).
from the bearing support.
c. Remove the assembled high-tension lead
o. Remove the two setscrews (38) that posi-
(20) and insulator (19) and remove the brush
tion the coil (57) in the frame (39); remove
and spring assembly (65) from the distributor
the coil.
Hock (66) .
p. Remove the lock wire (50) and nut (49)
d. Remove the screws (18) that secure the
from the end of the rotor (33) and remove the
distributor block (66) to the end cap; remove
magneto drive gear (51), bushing (52), and
the distributor block.
the assembled impulse coupling shell (53),
e. Remove the two screws (4) that secure
spring (54), and hub assembly (55). Carefully
the capacitor (5) to the end cap; remove the
release spring tension and disassemble the
capacitor and "O" ring (6).
parts.
f. Remove the screws (72) that secure the
q. Remove the oil slinger (45), outer seal
vent covers (71) to the end cap; remove the
washer (44), seal (43), and inner seal washer
vent covers and screens (70).
(42) from the end of the rotor.
g. Loosen the ground switch nut (79) and
r. Remove the retaining ring (41) and tap
remove the ground switch assembly from the
the rotor from the frame.
end cap. Remove the retaining ring (76) and
s. Remove the retaining ring (35) and re-
disassemble the switch parts.
move the shim (36) and bearing (37) from the
h. Remove the screw (17), nut (12), lock-
frame.
washer (11), and plain washer (10) that hold
t. Remove the screws (48) that secure the
the ground strip guide (13), capacitor contact
vent cover (47) and screen (46 ) to the frame;
(14), ground switch lead (15), and insulator
remove the parts.
bushing (16) to the end cap; disassemble the
parts.
95. Magneto Cleaning, Inspection and
Repairs
i. Remove the screw (17), nut (75). and
lockwasher (74) that hold the ground switch
a. Wash all metal parts in an approved
to contact support and the contact support strap
cleaning solvent, except the capacitor, coil,
(67) to push button strap (68) to the end cap;
bearings, and breaker contacts. Dry all parts
remove the parts.
with clean compressed air.
j. Remove the distributor rotor (21).
b. Inspect the vent screens for damage or
clogging. If necessary, blow the screens clean
k. Remove the screw (58) that secures the
with compressed air.
coil lead and the spring of the contact arm
