Subaru 2002 IMPREZA Service Manual page 428

STARTING/CHARGING SYSTEMS
2) Insulation test
Inspect the stator coil for continuity between stator
core and each end of lead wire. If resistance is 1 Ω
or less, the stator coil is grounded, and so replace
the stator assembly.
4. BRUSH
1) Measure the length of each brush. If wear ex-
ceeds the service limit, replace the brush. Each
brush has the service limit mark (A) on it.
Brush length:
Standard
18.5 mm (0.728 in)
Service limit
5.0 mm (0.197 in)
GENERATOR
2) Checking brush spring for proper pressure
Using a spring pressure indicator, push the brush
into the brush holder until its tip protrudes 2 mm
(0.08 in). Then measure the pressure of brush
spring. If the pressure is less than 2.648 N (270 g,
9.52 oz), replace the brush spring with a new one.
The new spring must have a pressure of 4.609 to
5.786 N (470 to 590 g, 16.58 to 20.81 oz).
G6M0079
5. BEARING (FRONT SIDE)
1) Check the front ball bearing. If the resistance is
felt while rotating, or if abnormal noise is heard, re-
place the ball bearing.
2) Replacing front bearing
(1) Remove the front bearing retainer.
(2) Closely install a fit tool on the bearing inner
race. Press the bearing down out of front brack-
et with a hand press or vise. A socket wrench
can serve as the tool.
H6M0499B
(3) Set a new bearing and closely install a fit
tool on the bearing outer race. Press the bearing
down into place with a hand press or vise. A
socket wrench can serve as the tool.
SC-18
(A) Front bracket
(B) Socket wrench
G6M0143
S6M0409A