Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLESERVICE AND REPAIRUNIT REPAIRMULTI-PLATE CLUTCH
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Multi-Plate Clutch
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Multi-Plate Clutch
A: REMOVAL
The multi-plate clutch is removed in the same way that the extension case is removed.
B: INSTALLATION
The multi-plate clutch is installed in the same way that the extension case is installed.
C: INSPECTION
^ Check the drive plate facing for wear and damage.
^ Check the snap ring for wear, return spring for permanent set and breakage, and return spring for deformation.
^ Check the lathe cut ring for damage.
^ Measure the clearance of the multi-plate clutch and adjust it to within specifications.
D: ADJUSTMENT
1. Remove the drive plate and driven plate from the center differential carrier.
2. Measure the distance "L" from mating surface of extension case to multi-plate clutch (LSD) piston with ST.
ST 398643600 GAUGE
L= Measured value - 15 mm
(L= Measured value - 0.59 inch)
A: Measured value
B: ST thickness [15 mm (0.59 inch)]
L: Distance from end of extension case to end of rear drive shaft
3. Measure the height "e" from mating surface of the transmission case to end surface of the center differential clutch drum with ST.
ST 398744300 GAUGE
e = Measured value - 50 mm (t = Measured value - 1.97 inch)
A: Measured value B: ST thickness [50 mm (1.97 inch)]
e: Distance from mating surface of transmission case to multi-plate clutch (LSD) piston
4. Calculation equation:
T = (L + 0.45 mm) - e
[T = (L + 0.0177 inch) - t]
T: Measurements between end surface of clutch drum and multi-plate clutch (LSD) piston.
L: Distance from mating surface of extension case to multi-plate clutch (LSD) piston. 0.45: Gasket thickness
e: Distance from mating surface of transmission case to end surface of the center differential clutch drum.
NOTE: Measure thickness of driven and drive plates of multi-plate clutch (LSD) and determine clearance between measured value and "T".
Standard value: 0.2 - 0.6 mm (0.008 - 0.024 inch)
Allowable limit: 1.6 mm (0.063 inch)
If out of specification, replace plate set (drive and driven plate) and select a multi-plate clutch (LSD) piston side adjusting plate to make it within specification.
The multi-plate clutch is removed in the same way that the extension case is removed.
B: INSTALLATION
The multi-plate clutch is installed in the same way that the extension case is installed.
C: INSPECTION
^ Check the drive plate facing for wear and damage.
^ Check the snap ring for wear, return spring for permanent set and breakage, and return spring for deformation.
^ Check the lathe cut ring for damage.
^ Measure the clearance of the multi-plate clutch and adjust it to within specifications.
D: ADJUSTMENT
1. Remove the drive plate and driven plate from the center differential carrier.
2. Measure the distance "L" from mating surface of extension case to multi-plate clutch (LSD) piston with ST.
ST 398643600 GAUGE
L= Measured value - 15 mm
(L= Measured value - 0.59 inch)
A: Measured value
B: ST thickness [15 mm (0.59 inch)]
L: Distance from end of extension case to end of rear drive shaft
3. Measure the height "e" from mating surface of the transmission case to end surface of the center differential clutch drum with ST.
ST 398744300 GAUGE
e = Measured value - 50 mm (t = Measured value - 1.97 inch)
A: Measured value B: ST thickness [50 mm (1.97 inch)]
e: Distance from mating surface of transmission case to multi-plate clutch (LSD) piston
4. Calculation equation:
T = (L + 0.45 mm) - e
[T = (L + 0.0177 inch) - t]
T: Measurements between end surface of clutch drum and multi-plate clutch (LSD) piston.
L: Distance from mating surface of extension case to multi-plate clutch (LSD) piston. 0.45: Gasket thickness
e: Distance from mating surface of transmission case to end surface of the center differential clutch drum.
NOTE: Measure thickness of driven and drive plates of multi-plate clutch (LSD) and determine clearance between measured value and "T".
Standard value: 0.2 - 0.6 mm (0.008 - 0.024 inch)
Allowable limit: 1.6 mm (0.063 inch)
If out of specification, replace plate set (drive and driven plate) and select a multi-plate clutch (LSD) piston side adjusting plate to make it within specification.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.