2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Drive Pinion: Installation

  1. Check the projection (A) of the knock pins.
    NOTE: When attached on the converter case side, install them on the drive pinion retainer side.
    G13950810Courtesy of SUBARU OF AMERICA, INC.

    Specification:Β 

    8.0 - 9.0 mm (0.31 - 0.35 in)

    G13950811Courtesy of SUBARU OF AMERICA, INC.
  2. Select the drive pinion washer.
    1. Measure the dimension "A" of a new taper roller bearing (front) inner race.
      G13950812Courtesy of SUBARU OF AMERICA, INC.
    2. Measure the dimension "B" of a new taper roller bearing (rear) inner race.
      G13950813Courtesy of SUBARU OF AMERICA, INC.
    3. Measure the dimension "C" of the drive pinion spacer.
      G13950814Courtesy of SUBARU OF AMERICA, INC.
    4. Place the drive pinion retainer on the surface plate, and set the taper roller bearing (rear) inner race to the taper roller bearing (rear) outer race.
      NOTE: Be careful not to tilt the taper roller bearing (rear) inner race when setting.
    5. Measure the height "H1" from the end face of the taper roller bearing (rear) inner race to the surface plate.
      G13950815Courtesy of SUBARU OF AMERICA, INC.
    6. Set the taper roller bearing (front) inner race to the taper roller bearing (front) outer race.
      NOTE: Be careful not to tilt the taper roller bearing (front) inner race when setting.
    7. Using the ST, measure and record the height "H2" from the ST end face to the taper roller bearing (front) inner race.

      Preparation tool:Β 

      ST: GAUGE (499575400)

      G13950816Courtesy of SUBARU OF AMERICA, INC.
    8. Using the following calculation, calculate an appropriate thickness "T1" of the drive pinion washer.
      NOTE: Adjust using 1 - 3 pieces.

    T1 = H1 - (A + B + C + H2 - 15 mm (0.6 in))

    T1 Drive pinion washer thickness (mm (in))
    H1 Measured value (mm (in)) of step (5)
    A Measured value (mm (in)) of step (1)
    B Measured value (mm (in)) of step (2)
    C Measured value (mm (in)) of step (3)
    H2 Measured value (mm (in)) of step (7)
    15 mm (0.6 in) Thickness of ST (GAUGE)
  3. Select the drive pinion shim.
    1. Using the ST, measure the height "H3" from the ST end face to the drive pinion retainer mating surface.

      Preparation tool:Β 

      ST: GAUGE (499575400)

      G13950817Courtesy of SUBARU OF AMERICA, INC.
    2. Using the following calculation, calculate the height "H4" from the transmission case mating surface of the converter case to the drive pinion retainer mating surface.

      H4 = H3 - 15 mm (0.6 in)

      H4 Height (mm (in)) from the transmission case mating surface of the converter case to the drive pinion retainer mating surface
      H3 Measured value (mm (in)) of step (1)
      15 mm (0.6 in) Thickness of ST (GAUGE)
    3. Place the converter case on the surface plate.
    4. Measure the inner diameter "D1" of the differential side retainer installation hole of the converter case.
      NOTE: Perform the measurement at the contact surface of the side bearing outer race.
      G13950818Courtesy of SUBARU OF AMERICA, INC.
    5. Using the following calculation, calculate the radius "R" of the differential side retainer installation hole.

      R = D1/2

      R Differential side retainer installation hole radius (mm (in))
      D1 Measured value (mm (in)) of step (4)
    6. Prepare a proper round bar, and measure its diameter at several locations.
    7. Mark locations with the same measured values and refer to the values as "D2".
    8. Set the marked location on the installation hole of the differential side retainer, and measure the height "H5" from the top end of the other marked location to the surface plate.
      G13950819Courtesy of SUBARU OF AMERICA, INC.
    9. Using the following calculation, calculate the height "H6" from the bottom end of the differential side retainer installation hole to the transmission case mating surface of the converter case.

      H6 = H5 - D2

      H6 Height (mm (in)) from the bottom end of the differential side retainer installation hole to the transmission case mating surface of the converter case
      H5 Measured value (mm (in)) of step (8)
      D2 Measured value (mm (in)) of step (7)
    10. Using the following calculation, calculate the distance "S" from the center of the front differential to the transmission case mating surface of the converter case.

      S = R + H6

      S Distance (mm (in)) from the center of the front differential to the transmission case mating surface of the converter case
      R Calculated value (mm (in)) of step (5)
      H6 Calculated value (mm (in)) of step (9)
      G13950820Courtesy of SUBARU OF AMERICA, INC.
    11. Using the following calculation, calculate an appropriate thickness "T2" of the drive pinion shim.
      NOTE: Adjust using 1 - 3 pieces.

    T2 = (S - H4 + H2 - 15 mm (0.6 in)) - 90.8 mm (3.57 in)

    T2 Drive pinion shim thickness (mm (in))
    S Calculated value (mm (in)) of step (10)
    H4 Calculated value (mm (in)) of step (2)
    H2 Measured value (mm (in)) of assembly step 2. (7)
    15 mm (0.6 in) Thickness of ST (GAUGE)
    90.8 mm (3.57 in) Ideal distance from the front differential center to the drive pinion end surface
    G13950821Courtesy of SUBARU OF AMERICA, INC.
  4. Set the drive pinion shim.
    G13950822Courtesy of SUBARU OF AMERICA, INC.
  5. Press-fit the taper roller bearing (front) inner race using the ST1, ST2 and a press.

    Preparation tool:Β 

    ST1: INSTALLER (899580100)

    ST2: EXTENSION DRIVE SHAFT (927130000)

    G13950823Courtesy of SUBARU OF AMERICA, INC.
  6. Install the drive pinion spacer and drive pinion washer.
    NOTE: Install the O-ring after checking and adjusting the tooth contact of hypoid gear set.
    G13950824Courtesy of SUBARU OF AMERICA, INC.
  7. Set the drive pinion.
    CAUTION: Be careful not to damage the oil seal.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.