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PART
13-1-GENERAL
CHARGING SYSTEM SERVICE
13-13
Check the specific gravity. If the
specific gravity reading is 1.230 or
below,
add water if necessary and
charge the battery until it is fully
charged.
The battery is fully charged when
the cells are all gassing freely and
the specific gravity ceases to rise
for three successive readings taken
at hourly
intervals.
Additional bat-
tery
testing will not be necessary
after the battery has been properly
charg-ed
.
7.
If
the voltag·e
reading
ob-
tained during the capacity test is
helow !1.6
volts,
check the specific
)!Tavity of each cell.
!l.
If
the difference between any
two cells
is
more than 50 points
(0.050), the battery is not satisfac-
tory for service and should be re-
placed.
9. If the difference between cells
is less than 50 points ( 0.050) the
battery should be charged according
to the charging schedule.
In some cases the electrolyte
level may be too low to obtain a
specific gravity reading.
In such
cases water should be added until
the electrolyte level just covers the
ring in the filler well, then charge
the battery at 35 amperes for the
maximum charging time indicated
in specifications, for capacity of the
battery being tested.
10.
After the battery has been
r:harged, repeat the capacity test.
If the capacity test battery voltage
is still less than 9.6 volts, replace
the battery. If the voltage is 9.6 or
more, the battery is satisfactory
for
service.
11
.
If the battery is found to be
discharged only, check for a loose
fan
belt,
loose
electrical connec-
tions,
charging
system
perform-
ance, and make a battery drain test
(in this secton).
9
COMMON ADJUSTMENTS AND REPAIRS
BELT ADJUSTMENT-
ALTERNATOR
1.
Loosen the alternator mount-
ing bolt and the adjusting arm
bolts.
2.
Apply pressure on the altern-
ator front housing only and tighten
the
adjusting arm to
alternator
bolt.
D
CLEANING AND INSPECTION
1.
The rotor, stator, and bear-
ings must not be cleaned with sol-
vent. Wipe these parts off with a
clean
cloth.
2.
Rotate
both
the
front and
rear bearings and assess their
con-
dition by feelin
g
for excessive play
or roughn ess.
Load the bearings
by hand pressure when checking
for roughness and rotate the outer
race at lea5
t
six
turns
in this man-
ner.
Look for excessive lubricant
leakage.
Replace bearings if any of these
conditions
exist.
3. Inspect
the
t·otor
assembly
for damage to the pole surfaces
due to contact with stationary com-
ponents; scores or bruises on the
slipring; loose slip ring; damaged
rotor leads; shaft thread damage etc.
Replace or repair this assembly
as required.
4.
Inspect the pulley and fan for
excessive
looseness
on the rotor
shaft.
Inspect the fan for cracks
and bent blades. Replace the fan if
cracks art! apparent.
5.
Check
both
end
heads
for
nacks, stripped threads
(particu-
lal'ly on the mounting lugs), distor-
tion
,
enlarged diode holes
etc.
Re-
place defective end-heads.
6.
Check the stator windings f01
signs of overheating. Make sure the
stator leads are not fractured or
broken oft' inside the sleeving.
BATTERY DRAIN TEST
This test will determine if there
is any external load
that would
cause unwanted battery discha rge.
Disconnect
the
battery
ground
cable and connect the positive lead
of a voltmeter to the
cable.
Con-
nect the negative lead of the volt-
meter to the battery negative post.
With all circuits off, the meter
should read zero. Any battery ex-
ternal load will cause th
e
voltmeter
to read full battery voltage.
If the car is equipped with an
electric clock. momentarily connect
the battery ground cable to the bat-
tery negative post to make certain
that the clock is wound. When the
clock
runs
down
at the end
of
approxima
tel
y
2 minutes the volt-
meter will show full battery vol-
tage.
3.
Check the belt tens ion using
tool 8620-B. Adjust the belt for
specified tension.
4.
Tighten all mounting
bolts.
Re-solder any poor
connections.
Replace
stator if insulation
is
burnt and
/
or flakin g·.
7.
Inspect the brush-card assem-
bly for distortion and
wear.
Inspect
brushes for wear and lead or spring
b,reakage.
This is best done by com-
parison
with
a
new
brush
and
sprin!('
assembly.
VERY IMPORTANT
Before assembling the Alternator,
refer to appropriate section for details
of Insulating Washers and the posi-
tion in which they are
used.
Failure to insulate the compon-
ents correctly can damage both the
Alternator and Regulator.
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