Starting System

Armature Inspection and Test

1. Inspect the armature for wear or damage due to contact with the field coil magnets.

2. A dirty or burnt commutator surface may be resurfaced with emery cloth or a lathe within the following specifications.

Commutator Diameter

	Standard (NEW)	Service Limit
Hitachi	40.0 mm (1.57 in)	39.0 mm (1.54 in)
Nippondenso	30.0 mm (1. 18 in)	29.0 mm (11. 14 in)
Mitsuba	28.0-28.1 mm (1.102-1.106 in)	27.5 mm (1.083 in)

Commutator Runout

	Standard (NEW)	Service Limit
Hitachi and Mitsuba	0.02 mm 0_ (0.0008 in)	0.05 mm (0.002 in)
Nippondenso	0.1 mm 0- (0.004 in)	0.4 mm (0.015 in)

3. If the commutator runout and diameter are within limits, check the commutator for damage or for carbon dust or brass chips between the segments.