Toyota Celica Supra 1986 Service And Repair Manual page 213

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STARTING SYSTEM - Staner ST-6
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2 . CHECK COMMUTATOR FOR OPEN CIRCUIT
Using an ohmmeter, check for continuity between the seg-
ments of the commutator.
If there is no continuity between any segment, replace the
armature.
Commutator
1 . INSPECT COMMUTATOR FOR DIRTY AND BURNT
SURFACES
II the surface Is dlny or burnt, correct with sandpaper
(No . 400) or a lathe.
2. CHECK COMMUTATOR RUNOUT
3.
Maximum circle runout : 0 .05 mm (0.0020 ln.)
If
runoutls greater than the maximum. correct with a lathe .
MEASURE DIAMETER OF COMMUTATOR
Standard diemeter: 30 mm 11.18 ln.)
Minimum diameter: 29 mm (1.14 1n.)
If the diameter of the commutator is less than the mini·
mum, replace the armature.
4 . CHECK SEGMENT
Check that the segment is clean and free of foreign pani-
cles. and smooth out the edge.
Standard undercut depth: 0.6 mm 10.024 1n.l
Minimum undercut depth: 0.2 mm (0.008 ln.)
If
the
undercut depth Is less than the minimum, comoct with
a hacksaw .
Field Coil
1. CHECK FIELD COIL FOR OPEN CIRCUIT
Using an ohmmeter. check for continuity between the lead
wire and field coil brush lead.
If there is no continuity. replace the field frame.