Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 117
SC(STI)-24
Generator
STARTING/CHARGING SYSTEMS
(3) Disconnect the connection and remove the
brush.
10) Remove the rectifier as follows.
(1) Remove the bolts which secure the rectifier.
(2) Remove the cover on terminal B.
(3) Remove the nuts of terminal B, then remove
the rectifier.
D: ASSEMBLY
Assemble in the reverse order of disassembly.
NOTE:
• Refer to component for tightening torque of each
part. <Ref. to SC(STI)-5, GENERATOR, COMPO-
• After assembling, manually turn the pulley to
check that the rotor rotates smoothly.
1) Push of the brush
Before assembling the front and rear parts, press
the brush down into the brush holder, then fix the
brush in that position by inserting a wire [1 mm
(0.08 in) dia., 40 — 50 mm (1.6 — 2.0 in) long]
through the hole as shown in the figure.
CAUTION:
After assembling, remove the wire.
2) Install the ball bearings
(1) Set the ball bearings in the front cover, then
securely install an appropriate tool (such as a
socket wrench of proper size) to the bearing
outer race.
(2) Using a press to press the ball bearings into
the specified location.
(3) Install the bearing retainer.
3) Install the bearings.
CAUTION:
Do not apply grease to the bearings. If there is
any oil on the bearing box, remove it complete-
ly.
(1) Use a press to install the bearings to the ro-
tor shaft.
(2) Heat the bearing box in rear cover at 50 to
60°C (122 to 140°F), and then press the bear-
ing into rear cover.
SC-00088
SC-00089
SC-00090
SC-00091
(A) Wire
SC-00092
(A)
SC(STI)-25
Generator
STARTING/CHARGING SYSTEMS
E: INSPECTION
1. DIODE
CAUTION:
There is the possibility of damaging the diodes
if a mega-tester (used to measure high voltag-
es) or a similar measuring instrument is used.
Never use a mega tester or equivalent for this
test.
1) Check for continuity between the diode lead and
positive side heat sink. If resistance is 1 Ω or more
only in the direction from the diode lead to the heat
sink, replace the rectifier.
2) Check for continuity between the negative side
heat sink and diode lead. If resistance is 1 Ω or
more only in the direction from the heat sink to the
diode lead, replace the rectifier.
2. ROTOR
1) Inspect the slip rings for contamination or any
roughness on the sliding surface. Repair the slip
ring surface using a lathe or sand paper.
2) Measure the slip ring outer diameter. Replace
the rotor if the slip ring is worn.
Slip ring outer diameter:
Standard
22.7 mm (0.894 in)
Limit
22.1 mm (0.870 in)
3) Using a circuit tester, check the resistance be-
tween slip rings. If resistance exceeds the stan-
dard, replace the rotor.
Standard:
Approx. 1.8 — 2.2
Ω
4) Check the continuity between slip ring and rotor
core or shaft. If there is continuity, replace the rotor
because the rotor coil is grounded.
5) Check the bearings. If there is any noise, or the
rotor does not rotate smoothly, replace the bear-
ings.
(A) Diode lead
(B) Heat sink (positive side)
(A) Diode lead
(B) Heat sink (negative side)
SC-00042
(B)
(A)
(A)
(B)
SC-00043
SC-00044
SC-00045
SC(STI)-26
Generator
STARTING/CHARGING SYSTEMS
3. STATOR COIL
1) Inspect continuity between the stator coil lead
wire terminals. If the resistance is 1 MΩ or more, re-
place the stator coil.
2) Inspect the continuity between the stator coil sta-
tor core and lead wire terminals. If the resistance is
1 Ω or less, replace the stator coil.
4. BRUSH
1) Measure the length of each brush. Replace the
brush if wear exceeds service limits. There is a ser-
vice limit mark (A) on each brush.
Brush length:
Standard (1)
18.5 mm (0.728 in)
Limit (2)
5.0 mm (0.197 in)
2) Using a spring pressure indicator, push the
brush into the brush holder until its tip protrudes 2
mm (0.08 in). Then measure the pressure of brush
spring. If the pressure is 2.648 N (270 g, 9.52 oz) or
less, replace the brush spring with a new part.
4.609 — 5.786 N (470 — 590 g, 16.58 — 20.810
oz) pressure is required on the new spring.
5. BALL BEARING
Check the ball bearings. Replace the ball bearings
if there is resistance in the rotation, or if there is any
abnormal noise.
6. OTHER INSPECTIONS
Check that the generator does not have deforma-
tion, cracks and any other damage.
(A) Stator coil
(A)
SC-00047
SC-00048
SC-02313
(A)
(1)
(2)
SC-00093
SC(STI)-27
Battery
STARTING/CHARGING SYSTEMS
4. Battery
A: REMOVAL
1) Disconnect the positive (+) terminal after discon-
necting the negative (–) terminal of battery.
2) Remove the harness clip of the negative termi-
nal from the battery rod.
3) Remove the flange nut from battery rod and re-
move battery holder.
4) Remove the battery.
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
3.5 N·m (0.4 kgf-m, 2.6 ft-lb)
NOTE:
• Clean the battery cable terminals and apply
grease to retard the formation of corrosion.
• Connect the positive (+) terminal, and then con-
nect the negative (–) terminal of the battery.
• After the battery is installed, initial diagnosis of
the electronic throttle control is performed. Wait for
10 seconds or more after turning the ignition switch
to ON, and then start the engine.
C: INSPECTION
WARNING:
• Electrolyte is corrosive acid, and has toxici-
ty; be careful of handling the fluid.
• Make sure the electrode does not come into
contact with skin, eyes or clothing. Especially
at contact with eyes, flush with water for 15
minutes and get prompt medical attention.
• In addition, be careful not to let the electrode
contact with the coated parts.
• Be careful when handling the batteries be-
cause they produce explosive gases.
• Be sure to keep battery away from any fire.
• For safety, in case an explosion does occur,
wear eye protection or shield your eyes when
working near any battery. In addition, never
lean over the battery.
• Ventilate sufficiently when using or charging
battery in enclosed space.
• Before starting work, remove rings, metal
watch-bands, and other metal jewelry.
• Never allow metal tools to contact the posi-
tive battery terminal and anything connected to
it while you are at the same time in contact with
any other metallic portion of the vehicle.
1. EXTERNAL PARTS
Check the battery case, top cover, vent plugs, and
terminal posts for dirt or cracks. 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 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 calculation:
S
20
= St + 0.0007 × (t – 20)
S
20
: Specific gravity corrected at electrolyte
temperature of 20°C (68°F)
St: Measured specific gravity
t: Measured temperature (°C)
Judge whether or not the battery requires
charging according to corrected specific
gravity.
Standard specific gravity: 1.220 — 1.290 [at
20°C (68°F)]
SC-02238
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