ALTERNATOR/REGULATOR
SERVICE
3. Tum the starting switch key to the ON position, and the
voltmeter
wilJ
indicate a value considerably lower than
the battery
vOltage. If the indication
is
near the battery
voltage, a ,defective generator
is
possible.
4.
With
the ammeter short-circuited, start
the
engine.
A
CAUTION:
"the
ammeter
is
not
short-cir-
cuited,
a
large
starting
current
will
bum
out
the
ammeter
coi/~
s.
Increase
the
engine
s~ed
to between 2000 and 3000 rpm
and read the ammeter.
6. If the ammeter reading does not exceed SA, read the
voltmeter at that state
(2000-3000 rpm). The voltmeter
reading is the regulated voltage.
7. If the ammeter reading exceeds
5A, continue charging
the battery until the ammeter reading drops to SA
or
below; or replace the battery with a fully-charged one; or
connect a
1/4Q (25W) resistor
in
series
to
the battery
to
restrict charging current.
S.
The
Ie
regulator is
of
the temperature compensation type
and, therefore, regulated voltage varies with temperature.
It
is necessary to measure the temperature
of
the rear
bracket (surrounding the regulator) and to use the
measurement for correction
of
regulated voltage.
AMMETER
CHECKING
THE
ICREGULATOR
VOLTAGE
REASSEMBLY
A
CAUTION:
Connect
the
altemator
properly.
Should
the
polarity
be
reversed,
a
powerful
current
would
flow
from
the
battery
into
the
alternator,
damaging
the
diodes
and
wiring
harness.
1.
Install the alternator support
bolt
through the alternator
leg (underside) into the engine casting.
2. Swing the alternator into position on the adjusting
bracket and fasten. Lightly tighten.
3. Adjust belt tension.
4.
Tighten both bolts and recheck belt tension.
Torque values:
Support bolt:
20-24
Nm
(15
18
ft-Ibs)
Adjusting bracket bolt:
12
- 14
Nm
(9
10
ft~lbs)
NOTE:
Make certain the belts are perfectly aligned with
the alternator
and
engine pulleys.
If
not, insert or remove
spacers
as
needed,
to
align the alternator.
Engines & Generators
64
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