Starter Inner Parts Inspection: Armature

WARNING: This page is about a different variant/trim than selected.

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

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- If there is conductivity, replace the armature.
Verify that there is no conductivity between the commutator and the shaft using a tester.

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- If there is conductivity, replace the armature.
Place the armature on V-blocks, and measure the runout using a dial indicator.

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- If not within specification, replace the armature.
  Starter armature runout
  
  0.1 mm {0.004 in} max.
Measure the commutator diameter.

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- 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.

Courtesy of MAZDA MOTORS CORP.
- 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}