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Starter Inner Parts Inspection: Armature

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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: Checking Continuity Between Commutator & Core At Each Segment
    G03699979Courtesy of MAZDA MOTORS CORP.
  2. 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 & Shaft
    G03699980Courtesy of MAZDA MOTORS CORP.
  3. Place the armature on V-blocks, and measure the runout using a dial indicator.
    • If not within the specification, repair using a lathe or replace the armature.

    Runout 

    1. 0.05 mm {0.002 in} max. 
    Fig 3: Measuring Runout Of Armature
    G03699981Courtesy of MAZDA MOTORS CORP.
  4. Measure the commutator diameter.
    • If not within the minimum specification, replace the armature.

    Standard commutator diameter 

    1. 29.4 mm {1.16 in} 

    Minimum commutator diameter 

    1. 28.8 mm {1.13 in} 
    Fig 4: Measuring Commutator Diameter
    G03699982Courtesy of MAZDA MOTORS CORP.
  5. Measure the segment groove depth of commutator.
    • If not within the minimum specification, undercut the grooves to the standard depth.

    Standard depth 

    1. 0.4-0.6 mm {0.016-0.023 in} 

    Minimum depth 

    1. 0.2 mm {0.008 in} 
    Fig 5: Measuring Segment Groove Depth Of Commutator
    G03699983Courtesy of MAZDA MOTORS CORP.
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