8
8-31
4st 25/30 2022
6) Inspection of the Brush
1. Measure the brush length. Replace the brush holder
assembly if the brush length is shorter than the specified
value.
a
12
2. Check the conductivity of the brush holder assembly.
Replace it if the value is not as specified.
Brush Length a: Standard Value
13.9 to 14.2 mm (0.547 to 0.559 in)
Wear Limit a:
9.5 mm (0.374 in)
1
2. Measure the outer diameter of the commutator 1.
Replace the starter motor assembly if the value is below
the specified value.
Commutator Outer Diameter: Standard Value
28.2 to 28.5 mm (1.110 to 1.122 in)
Wear Limit:
28.0 mm (1.102 in)
b
c
d
2
4. Check the conductivity of the armature 2. Replace the
starter motor assembly if the value is not as specified.
a
3
3
3
3
3
3
1
3. Measure the undercut a of the commutator 1. Replace
the starter motor assembly if the value is below the
specified value.
Commutator Undercut: Standard Value
1.0 to 1.2 mm (0.039 to 0.047 in)
Wear Limit a:
0.7 mm (0.027 in)
Armature Conductivity:
b Between commutator
segments 3 and 3
Conductive
c Between segment and
armature core
Not conductive
d Between segment and
armature shaft
Not conductive
Conductivity Between Brushes
Between Brush 1 and
Brush 2
Not conductive
Between brushes 12 and
Ground
Not conductive
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