Repair and Diagnosis: Electrical: Starter: Overhaul: Inspection: Commutator

1. Inspect commutator for dirt or signs of burning. If dirt or burning is present, sand lightly with No. 300-400 sand paper or turn on lathe as necessary to clean surface.
2. Using a dial indicator, check commutator for runout. Standard runout is .0019" (.05 mm) or less. Maximum runout is .016" (.4 mm). If runout exceeds maximum limit, replace commutator.
3. Using a micrometer, measure diameter of brush end of commutator. On Swift and Swift GT (A/T), standard measurement is 1.14" (29 mm). Minimum measurement is 1.13" (28.8 mm). On all GT (M/T), minimum measurement is 1.06" (27 mm). If measurement is less than minimum, replace commutator.
4. Measure depth of insulator grooves between commutator segments. See Fig 1 . On Swift and Swift GT (A/T), standard depth is .0196-.031" (.5-.8 mm). Minimum depth is .0078" (.2 mm). On all GT (M/T), minimum depth is .0078" (.2 mm). If measurement is less than minimum depth, replace commutator.

Fig 1: Measuring Depth Of Commutator Segment Grooves

Courtesy of SUZUKI OF AMERICA CORP.