Starter Inner Parts Inspection: Armature

WARNING: This page is about a different car, the 2017 Mazda 3. 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 a tester.

Fig 1: Checking Continuity Between Commutator And Core At Each Segment Using Tester
Courtesy of MAZDA MOTORS CORP.
- 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 Using Tester
Courtesy of MAZDA MOTORS CORP.
- If there is continuity, replace the armature.
Place the armature on V-blocks, and measure the runout using a dial indicator.

Fig 3: Measuring Runout Using Dial Indicator
Courtesy of MAZDA MOTORS CORP.
- 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
Courtesy of MAZDA MOTORS CORP.
- 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
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}