Subaru 2009 IMPREZA Service Manual page 415

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1) Continuity test

Inspect continuity between the stator coil lead wire

terminals. If the resistance is 1 M

lead wire is damaged. Replace the stator assem-

2) Insulation test

Inspect the continuity between the stator coil stator

core and lead wire terminals. If the resistance is 1

or less, the stator coil is grounded. Replace the sta-

tor assembly.

1) Measure the length of each brush. Replace the

brush if wear exceeds service limits. There is a ser-

vice limit mark (A) on each brush.

or more, the

Brush length:

Service limit

2) Check that there is appropriate pressure on the

brush spring.

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 2.648 N (270 g, 9.52 oz)

or less, replace the brush spring with a new part.

4.609 — 5.786 N (470 — 590 g, 16.58 — 20.810 oz)

pressure is required on the new spring.

5. BEARING (FRONT SIDE)

Check the front ball bearing. Replace the ball bear-

ings if there is resistance in the rotation, or if there

is any abnormal noise.

STARTING/CHARGING SYSTEMS

18.5 mm (0.728 in)

5.0 mm (0.197 in)