Subaru IMPREZA 2004 Service Manual page 302

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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.

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:

18.5 mm (0.728 in)

Service limit

5.0 mm (0.197 in)

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 20.810 oz).

5. BEARING (FRONT SIDE)

Check the front ball bearing. If the resistance is felt

while rotating, or if abnormal noise is heard, re-

place the ball bearing.

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