Section 141 (Starting System & Charging System (H6DO)): Generator: Inspection: Brush

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Measure the length of each brush. Replace the brush if wear exceeds service limits. There is a service limit mark (A) on each brush.
Brush length:

Standard (1)

22.5 mm (0.886 in)

Limit (2)

5.0 mm (0.197 in)

Fig 1: Measuring Brush Length
Courtesy of SUBARU OF AMERICA, INC.
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.

Fig 2: Checking Brush Spring Pressure
Courtesy of SUBARU OF AMERICA, INC.