Starter Inner Parts Inspection: Armature

Verify that there is no continuity between the commutator and the core at each segment using a tester.

Fig 1: Checking Continuity Between Commutator And Core At Segment
- If there is continuity, replace the armature.
Verify that there is no continuity between the commutator and the shaft using a tester.

Fig 2: Checking Continuity Between Commutator And Shaft
- If there is continuity, replace the armature.
Place the armature on V-blocks, and measure the runout using a dial indicator.

Fig 3: Checking Armature Runout Using Dial Indicator
- If not within specification, replace the armature.
  Starter armature runout
- 0.1 mm {0.004 in} max.
Measure the commutator diameter.

Fig 4: Measuring Commutator Diameter
- If not within the minimum specification, replace the armature.
  Starter commutator diameter
- Standard: 29.4 mm {1.16 in}
- Minimum: 28.8 mm {1.13 in}
Measure the segment groove depth of the commutator.

Fig 5: Measuring Segment Groove Depth Of Commutator
- If not within the minimum specification, undercut the grooves to the standard depth.
  Segment groove depth of starter commutator
- Standard: 0.5 mm {0.02 in}
- Minimum: 0.2 mm {0.008 in}