Starting System: Inspection: Commutator

1. Support the armature with a pair of V block and turn it to measure the runout of the surface not rubbed by the brushes using a dial gauge.

   Standard value: 0.05 mm (0.002 inch) or less 

   Limit: 0.1 mm (0.004 inch) 

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2. Measure the diameter of the commutator.

   Standard value: 29.4 mm (1.16 inches) 

   Limit: 28.8 mm (1.13 inches) 

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

3. Measure the depth of the undercut between segments.

Standard value: 0.5 mm (0.02 inch) 

Limit: 0.2 mm (0.01 inch) 

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.