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Home >> Subaru >> 2021 >> Forester Sport >> Repair and Diagnosis >> Transmission >> Automatic Trans >> CVT Transaxle System >> Forward Clutch >> Assembly >> Forward Clutch

Forward Clutch

  1. Install the forward clutch piston to forward clutch drum.
    NOTE: Apply CVTF to the seal of forward clutch piston.
    G08318070Courtesy of SUBARU OF AMERICA, INC.
  2. Install the return spring.
  3. Install the chamber and set the snap ring.
    NOTE: Apply CVTF to the sealing area of chamber.
  4. Compress the return spring using the ST1, ST2 and a press to install the snap ring.

    Preparation tool: 

    ST1: COMPRESSOR SPECIAL TOOL (18762AA010)

    ST2: COMPRESSOR (398673600)

    G08318063Courtesy of SUBARU OF AMERICA, INC.
  5. Check the operation of forward clutch piston by blowing compressed air from forward clutch carrier hole.
  6. Place the driven plate, drive plate and retaining plate neatly in this order on surface table.
  7. Using a magnet stand and a dial gauge (spindle type), set the dial gauge (spindle type) to the retaining plate, and read its scale.
    NOTE: The value, which is read in the gauge at this time, is zero point.
  8. Scale and record the weight "Z" of a flat board which will be put on retaining plate.
    NOTE:
    • Use a stiff board which does not bend against load as a flat board to be put on retaining plate.
    • Use a flat board weighing less than 5.3 kg (11.69 lb).
  9. Put the flat board on retaining plate.
    G10321124Courtesy of SUBARU OF AMERICA, INC.
  10. Using the following formula, read the push/pull gauge, and calculate "N".

    N = 52 N (5.3 kgf, 11.7 lb) - Z

    52 N (5.3 kgf, 11.7 lb): Load applied to clutch plate

    Z: Flat board weight

  11. Press the center of retaining plate by applying a force of "N" using push/pull gauge, and then measure the compression amount "A".
    NOTE: Measure at four points with a 90° interval and calculate the average.
    G13869502Courtesy of SUBARU OF AMERICA, INC.
  12. Install the dish plate, drive plate, driven plate and retaining plate in order, and install the snap ring.
    NOTE: Make sure to install in the right direction.
    G08318077Courtesy of SUBARU OF AMERICA, INC.
  13. Measure and record the clearance "B" between the retaining plate and snap ring.
    G08318078Courtesy of SUBARU OF AMERICA, INC.
  14. Calculate the piston stroke "S" with A and B dimensions recorded before.

    S mm (in) = A + B

    S: Piston stroke

    A: Compression amount of drive plate and dish plate

    B: Clearance between retaining plate and snap ring

    Specification: 

    1.0 - 1.4 mm (0.040 - 0.055 in)

    Service limit: 

    1.6 mm (0.063 in)

  15. If it exceeds the limit, using a new drive plate, select the retaining plate so that the piston stroke is within the standard value.
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