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Home >> GMC >> 2021 >> Yukon XL AT4 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions ( 6 Of 12) >> Repair Instructions >> Crankshaft Rear Oil Seal Replacement (4WD) >> Installation Procedure

Installation Procedure

  1. GM5595495Courtesy of GENERAL MOTORS COMPANY

    Install the EN-41479-2B  Seal Installer Pilot (5) and 3 screws (6) onto the rear of the crankshaft.

  2. Hand tighten the 3 screws (6). Do NOT overtighten.
    3. NOTE:

    For proper orientation, note the installation direction of the crankshaft rear oil seal. The crankshaft rear oil seal is a reverse-lip design.

    Do NOT lubricate the oil seal sealing surface.

    Install the oil seal with "THIS SIDE OUT" facing away from the engine.

  3. Install the NEW crankshaft rear oil seal (4) to the EN-41479-2B  Seal Installer Pilot (5) and push the crankshaft rear oil seal (4) to the crankshaft rear oil seal housing.
  4. Install the EN-41479-10  Crankshaft Rear Oil Seal Installer Adapter (3) to the EN-41479-1  Seal Installer (2).
  5. Install the EN-41479-3  Seal Installer Handle (1) to the EN-41479-1  Seal Installer (2) and EN-41479-10  Crankshaft Rear Oil Seal Installer Adapter (3).
  6. Thread the EN-41479-3  Seal Installer Handle (1) into the EN-41479-2B  Seal Installer Pilot (5) until the EN-41479-10  Crankshaft Rear Oil Seal Installer Adapter (3) contacts the NEW crankshaft rear oil seal (4).
  7. Align the NEW crankshaft rear oil seal (4) onto the EN-41479-10  Crankshaft Rear Oil Seal Installer Adapter (3).
  8. Rotate the EN-41479-3  Seal Installer Handle (1) clockwise until the NEW crankshaft rear oil seal (4) enters the crankshaft rear oil seal housing and seats into the bottom of crankshaft rear oil seal housing.
  9. Remove the EN-41479-3  Seal Installer Handle (1), EN-41479-1  Seal Installer (2), and EN-41479-10  Crankshaft Rear Oil Seal Installer Adapter (3) from the EN-41479-2B  Seal Installer Pilot (5).
  10. Remove the EN-41479-2B  Seal Installer Pilot (5) and 3 bolts (6) from the crankshaft.
  11. GM5591311Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The automatic transmission flex plate does not use a locating pin for alignment and will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the automatic transmission flex plate bolts. This procedure requires a 2 stage tightening process.

    Automatic Transmission Flex Plate (1) - Install

  12. GM5591310Courtesy of GENERAL MOTORS COMPANY

    Due to the unknown shelf life of the adhesive patch, prepare the 8 NEW automatic transmission flex plate bolts (1) as follows:

    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Apply thread locking adhesive to the external threads of the components. Adhesives, Fluids, Lubricants, and Sealers
    4. Ensure there are no gaps in the thread locking adhesive once applied to the component.
    13. CAUTION:

    This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

  13. Automatic Transmission Flex Plate Bolt (1) - Install NEW and hand tighten [ 8x ]
    14. CAUTION:

    Refer to Fastener Caution .

  14. Automatic Transmission Flex Plate Bolt (1) - Tighten in sequence [ 8x ] - Fastener Specifications
  15. GM5591309Courtesy of GENERAL MOTORS COMPANY

    Remove the M10-1.5 x 120 mm (3) and M10-1.5 x 45 mm (2) bolts.

  16. EN-42386  Flywheel Holding Tool (1) - Remove
  17. Transmission - Install - Automatic Transmission Removal and Installation (L84, L87, 4WD and NP0) , or Automatic Transmission Removal and Installation (L84, L87, 4WD and NQH) , or
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