Subaru XT 1988 Service Manual page 1194

I
ENGINE ELECTRICAL SYSTEM 6-1
4) Armature short circuit test
Check armature for short circuit by placing it on growler
tester. Hold a hacksaw blade against armature core while
slowly rotating armature. A short-circuited armature will
cause the blade to vibrate and to be attracted to core. If the
hacksaw blade is attracted or vibrates, the armature, which is
short-circuited, must be replaced or repaired.
Growler tester
LS-14S9
Fig. 18
5) Armature ground test
Using circuit tester, touch one probe to the commutator
segment and the other to shaft. There should be no continuity.
If there is a continuity, armature is grounded.
Replace armature if it is grounded.
Fig. 19
YOKE
Make sure pole is set in position.
OVERRUNNING CLUTCH
Inspect teeth of pinion for wear and damage. Replace it if
damaged. Rotate pinion in direction of rotation (clockwise).
It should rotate smoothly. But in opposite direction, it should
be locked.
Do not clean overrunning clutch with oil to prevent grease
BRUSH AND BRUSH HOLDER
1) Brush length
Measure the brush length and replace if it exceeds the service
limit.
Replace if abnormal wear or cracks are noticed.
Brush length:
Fig.
20
MIT
70381
Standard
Service limit
MIT
74081
17.0
mm
(0.669
in)
11.5 mm (0.453 in)
Standard
17.5 mm (0.689
in)
Service limit
12.0
mm
(0.472
in)
,
I
':-I!-I
~
_ _
.L...-+-I --Wear limit line
I II ,
I I,
I
I II I
~
II ,
'-J..L---~.JBrUSh
2) Brush movement
Be sure brush moves smoothly inside brush holder.
3) Insulation resistance of brush holder
L6-1461
Be sure there is no continuity between brush holder and its
plate.
L6-1462
from flowing out.
Fig. 21
13