Subaru Legacy III (2000-2003 year). Manual - part 457

SC(H4DOSTC)-16

STARTING/CHARGING SYSTEMS

GENERATOR

E: INSPECTION

1. ROTOR

1) Slip ring surface
Inspect the slip rings for contamination or any
roughness of the sliding surface. Repair the slip
ring surface using a lathe or sand paper.
2) Slip ring outer diameter
Measure the slip ring outer diameter. If the slip ring
is worn replace rotor assembly.

Slip ring outer diameter:

Standard

22.7 mm (0.894 in)

Limit

22.1 mm (0.870 in)

3) Continuity test
Check the resistance between slip rings using cir-
cuit tester.
If the resistance is not within specification, replace
the rotor assembly.

Specified resistance:

Approx. 1.8 — 2.2

Ω

4) Insulation test
Check the continuity between slip ring and rotor
core or shaft. If resistance is 1

Ω

or less, the rotor

coil is grounded, and so replace the rotor assem-
bly.

5) Ball bearing (rear side)
Check the rear ball bearing. Replace if it is noisy or
if the rotor does not turn smoothly.

2. BEARING (FRONT SIDE)

Check the front ball bearing. If the resistance is felt
while rotating, or if abnormal noise is heard, re-
place the ball bearing.

SC-00044

SC-00045

SC(H4DOSTC)-17

STARTING/CHARGING SYSTEMS

BATTERY

4. Battery

A: REMOVAL

1) Disconnect the positive (+) cable after discon-
necting the ground (

−

) cable of battery.

2) Remove the flange nuts from battery rods, and
then take off the battery holder.

3) Remove the battery.

B: INSTALLATION

Install in the reverse order of removal.

Tightening torque:

3.4 N·m (0.35 kgf-m, 2.5 ft-lb)

NOTE:
• Clean the battery cable terminals, and then apply
grease to retard formation of corrosion.
• Connect the positive (+) cable of battery and then
the ground (

−

) cable of battery.

C: INSPECTION

WARNING:
• Electrolyte has toxicity; be careful handling
the fluid.
• Avoid contact with skin, eyes or clothing. Es-
pecially at contact with eyes, blush with water
for 15 minutes and get prompt medical atten-
tion.
• Batteries produce explosive gasses. Keep
sparks, flame, cigarettes away.
• Ventilate when charging or using in enclosed
space.
• For safety, in case an explosion does occur,
wear eye protection or shield your eyes when
working near any battery. Never lean over a bat-
tery.
• Do not let the battery fluid contact eyes, skin,
fabrics, or paint-work because battery fluid is
corrosive acid.
• To lessen the risk of sparks, remove rings,
metal watch-bands, and other metal jewelry.
Never allow metal tools to contact the positive
battery terminal and anything connected to it
while you are at the same time in contact with
any other metallic portion of the vehicle be-
cause a short circuit will be caused.

1. EXTERNAL PARTS:

Check for the existence of dirt or cracks on battery
case, top cover, vent plugs, and terminal posts. If
necessary, clean with water and wipe with a dry
cloth.
Apply a thin coat of grease on the terminal 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.

3. SPECIFIC GRAVITY OF ELECTROLYTE:

1) Measure the specific gravity of electrolyte using
a hydrometer and a thermometer.
Specific gravity varies with temperature of electro-
lyte so that it must be corrected at 20

C (68

F) us-

ing the following equation:

= St + 0.0007

××××

−−−−

20)

: Specific gravity corrected at electro-

lyte temperature of 20

°°°°

St : Measured specific gravity
t : Measured temperature (

°°°°

Determine whether or not battery must be
charged, according to corrected specific
gravity.
Standard specific gravity: 1.220 — 1.290 [at
20

°°°°

C (68

°°°°

F)]

2) Measuring the specific gravity of the electrolyte
in battery will disclose the state of charge of bat-
tery. The relation between specific gravity and state
3) of charge is as shown in the figure.

SC-00053

SC-00094

1.28

Specific gravity [20

˚C (68

˚F)]

Specific gravity and state of charge

Complete charge

Charging condition

1.26

1.24

1.22

1.20

1.18

1.16

1.14

1.12

100%

75% 50%

22%

(%)

SC(H4DOSTC)-18

STARTING/CHARGING SYSTEMS

BATTERY

D: MEASUREMENT

WARNING:
• Do not bring an open flame close to the bat-
tery at this time.

CAUTION:
• Prior to charging, corroded terminals should
be cleaned with a brush and common baking
soda solution.
• Be careful since the battery electrolyte over-
flows while charging the battery.
• Observe the instructions when handling bat-
tery charger.
• Before charging the battery on vehicle, dis-
connect battery ground terminal. Failure to fol-
low this rule may damage alternator's diodes or
other electrical units.

1. JUDGMENT OF BATTERY IN CHARGED
CONDITION

1) Specific gravity of electrolyte is held at a specific
value in a range from 1.250 to 1.290 for more than
one hour.
2) Voltage per battery cell is held at a specific value
in a range from 2.5 to 2.8 volts for more than one
hour.

2. CHECK HYDROMETER FOR STATE OF
CHARGE

3. NORMAL CHARGING

Charge the battery at current value specified by
manufacturer or at approx. 1/10 of battery's am-
pere-hour rating.

4. QUICK CHARGING

Quick charging is a method in which the battery is
charged in a short period of time with a relatively
large current by using a quick charger.
Since a large current flow raises electrolyte temper-
ature, the battery is subject to damage if large cur-
rent is used for prolonged time. For this reason, the
quick charging must be carried out within a current
range that will not increase the electrolyte temper-
ature above 40

C (104

F).

It should be also remembered that the quick charg-
ing is a temporary means to bring battery voltage
up to a fair value and, as a rule, a battery should be
charged slowly with a low current.

CAUTION:
• Observe the items in 3. NORMAL CHARGING.
• Never use more than 10 amperes when
charging the battery because that will shorten
battery life.
MEMO:

Hydrometer

indicator

State of charge

Required action

Green dot

Above 65%

Load test

Dark dot

Below 65%

Charge battery

Clear dot

Low electrolyte