Repair Procedures: Inspection: Armature
- Remove the starter.
- Disassemble the starter as displayed at the beginning of this procedure.
- Inspect the armature for wear or damage from contact with the permanent magnet. If there is wear or damage, replace the armature.
- Check the commutator (A) surface. If the surface is dirty or burnt, resurface with emery cloth or a lathe within the following specifications, or recondition with #500 or #600 sandpaper (B).
- Check the commutator diameter. If the diameter is below the service limit, replace the armature.
Commutator Diameter
Standard (New): 29.4 mm (1.1575 in)
Service limit: 28.8 mm (1.1339 in)
- Measure the commutator (A) runout.
- If the commutator runout is within the service limit, check the commutator for carbon dust or brass chips between the segments.
- If the commutator run out is not within the service limit, replace the armature.
Commutator Runout
Standard (New): 0.05mm (0.0020in.) max
Service limit: 0.10mm (0.0039in.) max
- Check the mica depth (A). If the mica is too high (B), undercut the mica with a hacksaw blade to the proper depth. Cut away all the mica (C) between the commutator segments. The undercut should not be too shallow, too narrow, or v-shaped (D).
Commutator Mica Depth
Standard (New): 0.5 mm (0.0197 in.)
Limit: 0.2mm (0.0079 in.)
- Check for continuity between the segments of the commutator. If an open circuit exists between any segments, replace the armature.
- Check with an ohmmeter that no continuity exists between the commutator (A) and armature coil core (B), and between the commutator and armature shaft (C). If continuity exists, replace the armature.