Mitsubishi diesel engines, Service Manual

Page: 171 / 219

ELECTRICAL SYSTEM - DISASSEMBLY, INSPECTION AND REASSEMBLY
7 - 12
1.2 Inspecting and correcting the starter
(1)
Inspecting the brushes
(a)
Brush wear
Measure the length of the brushes. If the
measured value is equal to or less than the
limit, replace both the brush assembly and the
brush holder assembly.
Unit: mm (in.)
Standard
value
Limit
M001T68281
16.5
(0.65)
10.0
(0.39) Brush
length
M008T70471A
M008T81071A 18.0
(0.71)
11.0
(0.43)
(b)
Measuring the brush spring load
Using a new brush and a spring balance as
illustrated, measure the spring load at which
the spring lifts from the brush. If the measured
value is equal to or less than the limit, replace
the spring.
Unit: N (kgf) [lbf]
Standard
value
Limit
M001T68281
17.5 to 23.7
(1.78 to 2.41)
[3.9 to 5.3]
6.90
(0.70)
[1.6]
Brush
spring
load M008T70471A
M008T81071A
29.4 to 39.2
(3.0 to 4.0)
[6.6 to 8.8]
13.7
(1.40)
[3.1]
(c)
Brush holder insulation
Measure between each brush holder and the
brush holder base for continuity. If continuity
is indicated, replace the entire brush holder
assembly.
Check the brush holder for looseness.
Inspecting the brushes
Measuring the brush spring load
Checking the brush holder insulation
Replace if the measured
brush length is equal to
or less than the limit.
Brush holder