the engine starts, the pinion (11) is driven faster than the shaft and is threaded back along the screw shaft (8) out of mesh
with the flywheel.
b. Removal (fig. 31).
(1) Unscrew the starting motor terminal nut (19) and disconnect the starting motor cable (20) from the starting
motor terminal (17). Tape the starting motor cable to prevent accidental arcing.
(2) Remove the starting motor mounting screws (13) and star lockwashers (12).
(3) Pull out the starting motor (16) from the flywheel housing (15).
1
Oiler cup
9
Drive shaft bearing
2
Brush
10
Antidrift spring
3
Thru bolt
11
Pinion
4
Terminal stud
12
Field coil
5
Armature shaft
13
Armature
6
Drive spring
14
Commutator
7
Drive housing
15
Cover band
8
Screw shaft
16
End bracket
Figure 30. Starting motor, sectional view.
c. Ispection. Inspect the commutator and brushes for wear, dirt, cracking, or damage. Check the mounting screws
and nuts for damaged or stripped threads. See that the star lockwasher edges are sharp enough to bite into the metal
surface. Replace the star lockwashers if they are flat or if the edges are broken or dull.
d. Cleaning the Commutator. The commutator is cleaned in the same manner as the battery generator commutator
e. Replacing Brushes. Refer to paragraph 112e.
f. Sanding Brushes. Refer to paragraph 112f.
g. Testing Brush Spring Tension. Refer to paragraph 112g.
96