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Multi-Plate Clutch: Adjustment

WARNING: This page is about a different car, the 2003 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove drive plates and driven plates from the center differential carrier.
  2. Measure distance L from extension case mating surface to multi-plate clutch (LSD) piston with ST.

    ST 398643600 GAUGE

    L = Measured value - 15 mm

    (L = Measured value - 0.59 in)

    Fig 1: Measure Distance "L" From Extension Case Mating Surface To Multi-Plate Clutch (LSD) Piston With ST
    G01998968Courtesy of SUBARU OF AMERICA, INC.

    A:  Measured value

    B:  ST thickness [15 mm (0.59 in)]

    L:  Distance from end of extension case to end of rear drive shaft

  3. Measure the distance "l" from the transmission case mating surface to the center differential clutch drum end surface with ST.

    ST 398744300 GAUGE

    l = Measured value - 50 mm

    (l = Measured value - 1.97 in)

    ST 398744300 GAUGE

    Fig 2: Measure Distance "l" From Transmission Case Mating Surface To Center Differential Clutch Drum End Surface With ST
    G01998969Courtesy of SUBARU OF AMERICA, INC.

    A:  Measured value

    B:  ST thickness [50 mm (1.97 in)]

    l:  Measure distance from the transmission case mating surface to multi-plate clutch (LSD) piston.

  4. Calculation equation:

    T = (L + 0.45 mm) - l

    [T = (L + 0.0177 in) - l]

    T:  Distance from clutch drum to multi-plate clutch (LSD) piston

    L:  Distance from extension case mating surface to multi-plate clutch (LSD) piston

    0.45:  Gasket thickness

    l  : Distance from transmission case mating surface to center differential clutch drum

    NOTE: Measure the thickness of drive and driven plates of the mutli-plate clutch (LSD) and obtain the clearance between the measured value and "T".
    1. Standard:  0.2 - 0.6 mm (0.008 - 0.024 in)
    2. Standard:  0.2 - 0.6 mm (0.008 - 0.024 in)

    If out of specification, replace the plate set (drive and driven plates), and then select a side adjustment plate for the multi-plate clutch (LSD) piston so that the value becomes within specification.

    Fig 3: Available Driven Plates Chart
    G01998970Courtesy of SUBARU OF AMERICA, INC.
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