Commutator Check

Place the armature on a pair of V-blocks, and check the deflection by using a dial gauge. See Fig 1.
1. Standard value: 0.05 mm (0.002 inch)
2. Limit: 0.1 mm (0.004 inch)
Fig 1: Checking Commutator
Courtesy of CHRYSLER CORP.
Check the outer diameter of the commutator. See Fig 2.
1. Standard value: 29.4 mm (1.16 inch)
2. Minimum limit: 28.8 mm (1.13 inch)
Fig 2: Checking Diameter of Commutator
Courtesy of CHRYSLER CORP.
Check the depth of the undercut between segments. See Fig 3.
1. Standard value: 0.5 mm (0.02 inch)
2. Minimum limit: 0.2 mm (0.008 inch)
Fig 3: Checking Depth On Commutator
Courtesy of CHRYSLER CORP.