Starting Motor Inspection: Armature

Inspect commutator for dirt or burn. Correct with sandpaper or lathe, if necessary.

Fig 1: Cleaning Commutator With Sandpaper
Courtesy of SUZUKI OF AMERICA CORP.
Check commutator for uneven wear with armature (1) supported on V-blocks (2). If deflection of dial gauge pointer exceeds limit, repair or replace.
NOTE: Below specification presupposes that armature is free from bend. Bent armature must be replaced.

Commutator out of round

Standard: 0.05 mm (0.002 in.) or less

Limit: 0.4 mm (0.016 in.)

Fig 2: Measuring Commutator Out Of Round
Courtesy of SUZUKI OF AMERICA CORP.
Inspect commutator for wear. If diameter is below limit, replace armature.
Commutator outside diameter

Standard: 29.4 mm (1.16 in.)

Limit: 28.8 mm (1.13 in.)

Fig 3: Checking Commutator Outside Diameter
Courtesy of SUZUKI OF AMERICA CORP.
Inspect commutator for insulator depth. Correct or replace if below limit.
Commutator insulator depth "a"

Standard: 0.4 - 0.6 mm (0.016 - 0.024 in.)

Limit: 0.2 mm (0.008 in.)

Fig 4: Checking Commutator Insulator Depth

Courtesy of SUZUKI OF AMERICA CORP.