Subaru 1600 Service Manual page 672

ELECTRICAL SYSTEM
15-2. Battery, Fuse and Fusible Link
1. Battery
1) Removal & Installation
1) Disconnect the positive (+) tenni-
nal after disconnecting the negative (-)
tenninal of the battery.
2) Remove the flange nuts from the
battery rods and take off the battery
holder.
3) Remove the battery.
4) Installation should follow the
removal procedure in the reverse
order.
Fig. 15-1 Installing battery
NOTE:
a. Clean battery cable terminals and
apply grease to retard the forma-
tion of corrosion.
b. Connect the positive
(+)
terminal of
the battery and then the negative
(-) terminal of the battery.
2) Inspection
1) External parts
Check for the existence of dirt or
cracks on the battery case, top cover,
vent plugs, and tenninal posts. If nec-
essary, clean with water and wipe with
a dry cloth.
Apply a thin coat of grease on the
tenninal posts to prevent corrosion.
2) Electrolyte level
Check the electrolyte level in each cell.
If the level is below MIN LEVEL,
bring the level to MAX LEVEL by
pouring distilled water into the battery
cell. Do not fill beyond MAX LEVEL.
A9·002
Fig.
15-2
Electrolyte level
NOTE:
a. Electrolyte has toxicity; be careful
handling the fluid.
b. Avoid contact with skin, eyes or
clothing. Especially at contact with
eyes, blush with water for 15
minutes and get prompt· medical
attention.
c. Batteries produce explosive gasses.
Keep sparks, flame, cigarettes away.
d. Ventilate when charging or using in
enclosed space.
3) Specific gravity
Indicator is provided for checking the
specific gravity and the battery condi-
tion.
INDICATOR SIGN
~Blue
OK
@:::>-
Red or white
CHARGING
NECESSARY
A9-433
Fig.
15-3
Indicator sign
"OK"
"Charging
necessary "
Charged condition
Specific gravity> 1.15
The battery must be
recharged when engine
does not start.
Specific gravity
<
1.15
15-9
4) Voltage under high discharge
Charging (or discharging) the battery
raises (or lowers) the voltage but after
stopping the charging (or discharging)
the voltage gradually varies and finally
settles at about
2
volts per cell. There-
fore, to check the real condition of the
battery, it is necessary to measure the
voltage with the battery under high
discharge. A simple method is the use
of a high-discharge battery tester.
Check that the individual cell voltages
are more than 1.5 volts and the voltage
differences between the cells are with-
in 0.1 volt when the measurements are
made for 5 seconds per cell.
3) Charging
Measuring the specific gravity of the
electrolyte in the battery will disclose
the state of charge of the battery. The
relation between the specific gravity
and the state of charge is as shown in
figure.
~
1.280
!e
u
1.250
~
1.230
1.220
>
.; 1.190
co
a,
u
1.130
;;: 1
OO!-.;%:;---:;;7"='5%:::-::66"='%::-;-;:5""0%""'--""2'=57:%~':::"""
.~
\ Charging condition
(%)
en
Complete charge
A9·004
Fig. 15-4 Specific gravity and state of
charge
1) Nonnal charging
NOTE:
a. Remove all the vent plugs since
electrolyte generates gas toward the
end of charging.
b. Do not bring an open flame close to
the battery at this time.
c. Prior to charging, corroded termi-
nals should be cleaned with a brush
and common baking soda solution.