Contents: Checking the anchor ⬇ Starter brushes ⬇ Checking the brush holder ⬇ Checking the overrunning clutch ⬇
Checking the anchor
Attention. Depending on the year of manufacture and modification, some values given below may differ from the values of your vehicle's instruments.
1. Remove the starter assembly.
2. Disassemble the starter.
3. Check the anchor for wear or damage from contact with the permanent magnet.
4. Check the surface of the switch. If the surface is dirty or burnt, clean the surface with sandpaper.
5. Measure the commutator runout.
If the commutator runout is within the acceptable range, check the commutator for carbon dust or copper filings between the segments.
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If the commutator runout is outside the permissible limits, replace the anchor.
- Commutator beating (standard value): 0.02mm max.
- Commutator beating (limit value): 0.05 mm.
6. Check the groove depth (A) If the groove depth is too deep (B), trim it to the required depth with a hacksaw. Trim all grooves (C) between the anchor segments. The undercut should not be too shallow, too narrow or V-shaped (D). Standard groove depth: 0.5 mm, limit value 0.2 mm.
7. Check for continuity between the commutator segments. If there is a break in the circuit between any segment, replace the anchor.
8. Use an ohmmeter to check for electrical continuity between the commutator and the core of the armature coil and between the commutator and the armature shaft. If there is continuity, replace the armature.
Starter brushes
Worn or oily brushes must be replaced.
Checking the brush holder
1. Check for continuity between the (+) brush mount (A) and the (-) brush mount (B). If there is no continuity, replace the brush mount assembly.
Please note: The drawing below is schematic and may differ from the actual one.
2. Lift each brush spring with a screwdriver, then position the brush about halfway to its mount and loosen the spring to secure it in place.
3. Install the anchor on the housing and install the brush mount. Next, lift each brush spring again and lower the brushes down until they rest on the commutator, then loosen the spring opposite the end of the brush.
Note: To install the brushes, place sandpaper between the commutator and each brush and rotate the armature slowly. The contact surface of the brushes will follow the contour of the commutator.
Checking the overrunning clutch
1. Move the overrunning clutch along the shaft. Replace the overrunning clutch if the clutch does not move smoothly.
2. Turn the overrunning clutch in both directions. Lock it in one direction and turn it smoothly in the opposite direction. If it does not lock in either direction, replace the overrunning clutch
3. If the starter pinion is worn or damaged, replace the overrunning clutch assembly (gear not available separately).
Check the flywheel or torque converter ring gear if the starter pinion teeth are damaged.