Checking The Commutator

Place the armature on a pair of V-blocks, and check the run - out by using a dial gauge.
Standard value

Armature run - out : 0.05 mm (0.002 in.)

Limit

Armature run - out : 0.1 mm (0.0039 in.)

Fig 1: Measuring Armature Run Out
Courtesy of KIA MOTORS AMERICA, INC.
Check the outer diameter of the commutator.
Standard value

Outer diameter of the commutator : 29.4 mm (1.157 in.)

Limit

Outer diameter of the commutator : 28.4 mm (1.118 in.)

Fig 2: Measuring Commutator
Courtesy of KIA MOTORS AMERICA, INC.
Check the depth of the undercut between segments.
Standard value

Depth of the undercut between segments

: 0.5mm (0.020 in.)

Limit

Depth of the undercut between segments

: 0.2mm (0.079 in.)

Fig 3: Measuring Undercut Depth

G00319469

Courtesy of KIA MOTORS AMERICA, INC.