Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 116

SC(STI)-20

Starter

STARTING/CHARGING SYSTEMS

7. PERFORMANCE TEST

The starter should be submitted to performance

tests whenever it has been overhauled, to assure

its satisfactory performance when installed on the

engine.

Three performance tests, no-load test, load test,

and lock test, are presented here; however, if the

load test and lock test cannot be performed, carry

out at least the no-load test.

For these performance tests, use the circuit shown

in figure.

1) Adjust the variable resistance with the switch on

until the voltage is 11 V, and read the value dis-

played by the ammeter to measure starter speed.

Compare these values with the standard.
No-load test (standard):
Voltage/Current

6MT

Max. 11 V/90 A or less

5MT

Max. 11 V/95 A or less

Rotating speed

6MT

2,860 rpm or more

5MT

2,500 rpm or more

2) Apply the specified braking torque to starter. The

condition is normal if the current draw and starter

speed are within standard.
Load test (standard):
Voltage/Load

6MT

8 V/9.3 N·m (0.9 kgf-m, 6.9 ft-lb) or more

5MT

7.5 V/8.84 N·m (0.9 kgf-m, 6.5 ft-lb) or more

Current/Speed

6MT

280 A/860 rpm or more

5MT

300 A/870 rpm or more

3) With the starter stalled, or not rotating, measure

the torque developed and current draw when the

voltage is adjusted to standard voltage.
Lock test (standard):
Voltage/Current

6MT

4 V/515 A or less

5MT

4 V/680 A or less

Torque

6MT

16 N·m (1.6 kgf-m, 11.8 ft-lb) or more

5MT

17 N·m (1.7 kgf-m, 12.5 ft-lb) or more

8. OTHER INSPECTIONS

Check that the starter does not have deformation,

cracks and any other damage.

(A) Variable resistance
(B) Magnet switch

(C) Starter body

(A)

(B)

(C)

12V

+

A

V

B

S

M

SC-00077

SC(STI)-21

Generator

STARTING/CHARGING SYSTEMS

3. Generator

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the V-belt covers.

3) Disconnect the connector and terminal from

generator.

4) Remove the front side belts. <Ref. to ME(STI)-

40, FRONT SIDE BELT, REMOVAL, V-belt.> <Ref.

to ME(w/o STI)-38, FRONT SIDE BELT, REMOV-

AL, V-belt.>

5) Remove the bolts which install the generator

onto bracket.

B: INSTALLATION

Install in the reverse order of removal.
CAUTION:

Check and adjust the front side belt tension.

<Ref. to ME(STI)-46, FRONT SIDE BELT, IN-

SPECTION, V-belt.> <Ref. to ME(w/o STI)-44,

FRONT SIDE BELT, INSPECTION, V-belt.>
Tightening torque:

25 N·m (2.5 kgf-m, 18.4 ft-lb)

Tightening torque:

13 N·m (1.3 kgf-m, 9.6 ft-lb)

IN-00203

FU-03487

SC-02154

SC-00179

SC-00179

FU-03487

SC(STI)-22

Generator

STARTING/CHARGING SYSTEMS

C: DISASSEMBLY

1) Remove the four through-bolts.

2) Use a drier to heat the rear cover (A) portion to

50°C (122°F).

3) Insert the end of a flat tip screwdriver into the

gap between stator core and front cover. Pry them

apart to disassemble.

4) Using a vise, support the rotor and remove the

pulley nut, and remove the rotor from the front cov-

er.
CAUTION:

When holding the rotor with a vise, place alumi-

num plates or wooden pieces on the vise jaws

to prevent rotor from damage.

5) Use the following procedures to remove the ball

bearings.

(1) Remove the bolt, and then detach the bear-

ing retainer.

(A) Screwdriver

SC-00078

SC-00079

(A)

SC-00080

(A)

(A)

(A) Front cover
(B) Pulley

(C) Pulley nut
(D) Rotor

SC-00035

(A)

(B)

(C)

(D)

SC-00036

SC-00081

SC(STI)-23

Generator

STARTING/CHARGING SYSTEMS

(2) Firmly attach an appropriate tool (such as a

correct size socket wrench) to the bearing inner

race.

(3) Use the press to push the ball bearings out

from the front cover.

6) Using the bearing puller, remove the bearings

from the rotor.

7) Disconnect the connection between the rectifier

and stator coil, then remove the stator coil.
CAUTION:

The rectifier is easily damaged by heat. Do not

allow a 180 — 270 W soldering iron to contact

the terminals for 5 seconds or more at a time.

8) Use the following procedures to remove the IC

regulator.

(1) Remove the screws which secure the IC

regulator to the rear cover.

(2) Disconnect the connection between the IC

regulator and rectifier, then remove the IC reg-

ulator.

9) Use the following procedures to remove the

brush.

(1) Remove the cover A.

(2) Remove the cover B.

SC-00082

SC-00046

SC-00083

(A) Cover A

(A) Cover B

SC-00084

SC-00085

SC-00086

(A)

SC-00087

(A)