PERFORMANCE TEST Subaru Impreza WRX STI GR

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.

Scheme 38

1. No-load test With switch on, adjust the variable resistance until the voltage is 11 V, read the value of ammeter to measure starter speed. Compare these values with the standard. No-load test (standard): Voltage/Current MT model Max. 11 V/95A AT model Max. 11 V/90A Rotating speed MT model 2,500 RPM or more AT model 2,000 RPM or more
2. Load test 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 MT model 7.5 V/8.84 N.m (0.9 kgf-m, 6.5 ft-lb) AT model 7.7 V/16.7 N.m (1.7 kgf-m, 12.3 ft-lb) Current/Speed: MT model 300 A/870 RPM or more AT model 400 A/710 RPM or more
3. Lock test

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

MT model

4 V/680 A or less

AT model

3.5 V/960 A or less

Torque

MT model

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

AT model

31 N.m (3.2 kgf-m, 22.9 ft-lb) or more

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1. Disconnect the ground cable from the battery.
2. Remove the collector cover. (Turbo model)
3. Remove the collector cover cover bracket. (Turbo model)
4. Remove the V-belt covers. (Non-turbo model)
5. Disconnect the connector and terminal from generator.
6. Remove the front side belts. Refer to «FRONT SIDE BELT»(ref-325301-S19102835222009071800000) , REMOVAL, V-belt. Refer to «FRONT SIDE BELT»(ref-325302-S29866740192009071800000) , REMOVAL, V-belt.
7. Remove the bolts which install the generator onto bracket.

Scheme 42

Install in the reverse order of removal.

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)

Tightening torque

T1: 8.5 N.m (0.9 kgf-m, 6.3 ft-lb)

T2: 25 N.m (2.5 kgf-m, 18.4 ft-lb)

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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 bolt. CAUTION: When holding the rotor with a vise, place aluminum plates or wooden pieces on the vise jaws to prevent rotor from damage.
5. Use the following procedures to remove the ball bearings. Remove the bolt, and then detach the bearing retainer. Firmly attach an appropriate tool (such as a correct size socket wrench) to the bearing inner race. 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. Remove the screws which secure the IC regulator to the rear cover. Disconnect the connection between the IC regulator and rectifier, then remove the IC regulator.
9. Use the following procedures to remove the brush. Remove the cover A. Remove the cover B. Disconnect the connection and remove the brush.
10. Remove the rectifier as follows. Remove the bolts which secure the rectifier. Remove the cover on B terminal. Remove the nuts of B terminal, then remove the rectifier.