Service Manual

STARTER SYSTEM 8-13
Electric Starter System
Armature Inspection
•
Inspect the surface of the commutator [A].
If it is scratched or dirty, polish it with a piece of very fine
emery cloth [B], and clean out the grooves.
•
Measure the depth of the grooves between the commu-
tator segments.
If the grooves are shallower than the specified limit, re-
place the armature with a new one.
If the grooves are only dirty, clean them carefully.
Commutator Groove Depth
Standard:
FX Models 0.6 mm (0.02 in.)
FR and FS Models
–––
Service Limit:
FX Models 0.2 mm (0.008 in.)
FR and FS Models 1.27 mm (0.05 in.)
Bad [A]
Segment [B]
Good [C]
0.2 mm (0.008 in.) limit [D]
Mica [E]
•
Measure the outside diameter [A] of the commutator [B]
at several points.
If the diameter is less than the service limit, replace the
armature with a new one.
Commutator Outside Diameter
Standard:
FX Models 28.0 mm (1.10 in.)
FR and FS Models
–––
Service Limit:
FX Models 27.0 mm (1.06 in.)
FR and FS Models 31.369 mm (1.235 in.)
•
Support the armature in an alignment jig at each end of
the shaft as shown. Position a dial indicator perpendicular
to the commutator.
•
Rotate the armature slowly and read the commutator
runout.
If runout is more than the service limit, replace the arma-
ture with a new one.
Commutator Runout
Service Limit:
FX Models 0.4 mm (0.016 in.)
FR and FS Models 0.043 mm (0.0017 in.)