Starter Inner Parts Inspection: Armature

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

Verify that there is no continuity between the commutator and the core at each segment using a tester.
- If there is continuity, replace the armature.
  
  Fig 1: Verifying Continuity Between Commutator And Core At Each Segment
  Courtesy of MAZDA MOTORS CORP.
Verify that there is no continuity between the commutator and the shaft using a tester.
- If there is continuity, replace the armature.
  
  Fig 2: Verifying Continuity Between Commutator And Shaft
  Courtesy of MAZDA MOTORS CORP.
Place the armature on V-blocks, and measure the runout using a dial indicator.
Starter armature runout

0.05 mm {0.002 in} max.

Fig 3: Placing Armature On V-Blocks
Courtesy of MAZDA MOTORS CORP.
Measure the 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}

Fig 4: Measuring Commutator Diameter
Courtesy of MAZDA MOTORS CORP.
Measure the segment groove depth of the commutator.
- If not within the minimum specification, undercut the grooves to the standard depth.
Segment groove depth of starter commutator

Standard: 0.4-0.6 mm {0.016-0.023 in}

Minimum: 0.2 mm {0.008 in}

Fig 5: Measuring Segment Groove Depth Of Commutator
Courtesy of MAZDA MOTORS CORP.