Suzuki 2000 Grand Vitara SQ625 Service Manual page 676

6G-14 CRANKING SYSTEM
1. Armature
2. V-block
3. Magnetic stand
4. Dial gauge
"a"
1. Commutator segment
2. Insulator
_ Check commutator for uneven wear with armature supported
on V-blocks. 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 (0.015 in.)
_ 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.)
_ Inspect commutator for insulator depth. Correct or replace if
below limit.
Commutator insulator depth "a"
Standard : 0.4 – 0.6 mm (0.015 – 0.023 in.)
Limit : 0.2 mm (0.008 in.)
_ Ground Test
Check commutator and armature core. If there is continuity, ar-
mature is grounded and must be replaced.