Starter Inner Parts Inspection: Armature

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Verify that there is no continuity between the commutator and the core at each segment using an ohmmeter.
- If there is continuity, replace the armature.
  
  Fig 1: Inspecting Starter Inner Parts
  Courtesy of MAZDA MOTORS CORP.
Verify that there is no continuity between the commutator and the shaft using an ohmmeter.
- If there is continuity, replace the armature.
  
  Fig 2: Checking Continuity Between Commutator And Shaft Using An Ohmmeter
  Courtesy of MAZDA MOTORS CORP.
Place the armature on V-blocks, and measure the runout using a dial indicator.
Runout

0. 1 mm {0. 004 in} max.

Fig 3: Measuring Runout Using A Dial Indicator
Courtesy of MAZDA MOTORS CORP.
Measure the commutator diameter.
- If it is less than the specification, replace the armature.
  Standard commutator diameter
  
  29. 4 mm {1. 16 in}
  
  Minimum commutator diameter
  
  28. 8 mm {1. 13 in}
  
  Fig 4: Measuring Commutator Diameter
  Courtesy of MAZDA MOTORS CORP.
Measure the segment groove depth of commutator.
- If it is less than the specification, undercut the grooves to the standard depth.
  Standard depth
  
  0. 5 mm {0. 02 in}
  
  Minimum depth
  
  0. 2 mm {0. 008 in}
  
  Fig 5: Measuring Segment Groove Depth Of Commutator
  Courtesy of MAZDA MOTORS CORP.