Commutator Test
- Clean surface and polish with No. 400 sandpaper if required. If surface is scored, out of round or pitted, turn commutator in a lathe.
- Maximum commutator runout and minimum diameter of commutator must not exceed specification after turning. See COMMUTATOR SPECIFICATIONS table.
- Commutator mica undercut depth should be .020 -.030" (.50 -.80 mm). Minimum mica undercut depth is .008" (.20 mm). If not within specification, undercut to standard depth.
COMMUTATOR SPECIFICATIONS
| Application | Maximum Runout In. (mm) | Minimum Diameter In. (mm) |
|---|---|---|
| B2200 M/T, Protege M/T 323 | .004 (.10) | 1.24 (31.4) |
| Miata | .001 (.03) | 1.21 (30.8) |
| MX-3 4-Cyl. | .004 (.10) | 1.22 (31.0) |
| RX7 M/T | .002 (.05) | 1.26 (32.0) |