ALTERNATOR
TESTING
BQlQr
1.
Measure
the
resistance across
the
slip rings with
an
ohmmeter.
2.
If the resistance
is
not the factory specification, replace
it.
3.
Check the continuity across the slip ring and core with
an
ohmmeter.
4.
If infinity
is
not indicated, replace
it.
I
Resistance
I
Factory
spec.
12.8
to
3.3
(l
Slip Rino
1.
Check the slip ring for score.
2.
If scored, correct with
an
emery paper or
on
a lathe.
3.
Measure the
0.0.
of slip ring with vernier calipers.
4.
If the measurement is less than the allowable limit, replace il.
Factory
spec.
22.7
mm
0.894
in.
Slip ring D.D.
Allowable
limit
22.1
mm
0.870 in.
Brush
Wear
1.
Measure the brush length with vernier calipers.
2.
If
the
measurement is less than allowable limit, replace il.
3.
Make sure that the brush moves smoothly.
4.
If
the
brush is defective, replace il.
Factory
spec.
18.5 mm
0.728 in.
Brush length
Allowable
limit
5.0mm
0.1.97
in.
Rectifier
1.
Check the continuity across
each
diode of rectifier with
an
ohmmeter.
2.
The rectifier is normal if
the
diode
in
the rectifier conducts
in
one direction
and
does not conduct
in
the reverse direction.
IC
Regulator
1.
Check the continuity across
the
"B" terminal
and
the
"F"
terminal of
IC
regulator with
an
ohmmeter.
2.
The
IC
regulator is normal if the conducts
in
one
direction
and
does not conduct
in
the reverse direction.
B
E
...v:
WESTERBEKE
Engines & Generators
39
MEASURING
SLIP
RINGS
MEASURING
BRUSH
LENGTH
CHECKING
CONTINUITY
B
8
TERMINAL
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