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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 ( 2 Of 12) >> Repair Instructions >> Crankshaft and Bearing Removal and Installation >> Disassemble Procedure

Disassemble Procedure

  1. GM5585082Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Left side shown, right side similar.
    • Pull only on the spark plug wire boot to remove the wire.
    • Inspect the spark plug wire for damage and replace if necessary.

    Twist the spark plug wire boot a 1/2 turn and remove the spark plug wire (8) from the gas engine ignition spark plug.

  2. Valve Rocker Arm Cover Bolt (3) - Remove [ 19x ] [ 9x ]
  3. Valve Rocker Arm Cover (2) - Remove [ 2x ]
  4. Valve Rocker Arm Cover Gasket (1) - Remove and DISCARD [ 2x ]
  5. GM5585083Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Valve Rocker Arm (1) - Remove [ 16x ]

  6. Valve Push Rod (2) - Remove [ 16x ]
  7. GM5585085Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Disconnect the valve rocker arm oil control valve extension harness connector (1) from the valve rocker arm oil control valve harness.

  8. Cylinder Head Bolt (2) - Remove and DISCARD
  9. Cylinder Head Bolt (3) - Remove and DISCARD [ 19x ]
  10. Cylinder Head (4) - Remove [ 2x ]
  11. Cylinder Head Gasket (5) - Remove and DISCARD [ 2x ]
  12. GM4997027Courtesy of GENERAL MOTORS COMPANY

    Oil Pan Bolt (1, 2) - Remove [ 2x ]

  13. Oil Pan (3) - Remove
  14. GM5577670Courtesy of GENERAL MOTORS COMPANY

    Oil Pan High Pressure Port Seal (2) - Remove and DISCARD

  15. Oil Pan Front Seal (3) - Remove and DISCARD
  16. GM5040234Courtesy of GENERAL MOTORS COMPANY

    Use the EN-24270  Cylinder Bore Ridge Reamer (1) in order to remove the cylinder bore ring ridge, if required.

    1. Turn the crankshaft until the piston is at the bottom of the stroke.
    2. Place a cloth on top of the piston.
    3. Use the EN - 24270  Cylinder Bore Ridge Reamer to remove a cylinder ring ridge.
    4. Turn the crankshaft so the piston is at the top of the stroke.
    5. Remove the cloth.
    6. Remove the cutting debris from the cylinder and piston.
  17. GM1552546Courtesy of GENERAL MOTORS COMPANY

    Using a paint stick or etching tool, place matchmarks or numbers on the connecting rods and the connecting rod caps. The connecting rods and caps MUST be assembled to their original position and direction.

    • A stamping mark on the side of the connecting rod, at the crankshaft journal, may affect component geometry.
    • Mark the top of the piston to the specific cylinder bore.
  18. GM5373143Courtesy of GENERAL MOTORS COMPANY

    Mark, sort, or organize the connecting rod bearings so they may be installed to their original position and location. The connecting rods and the bearing caps are NOT interchangeable.

    19. NOTE:

    The bolts are single use and must be discarded before final installation.

  19. Remove the connecting rod bolts (1), cap (2) and bearing (3).
  20. GM5373144Courtesy of GENERAL MOTORS COMPANY

    Install the EN-41556  Connecting Rod Guide (2) to the connecting rod (1).

  21. GM5373145Courtesy of GENERAL MOTORS COMPANY

    Using a hammer, tap lightly on the end of the EN-41556  Connecting Rod Guide (3) to remove the piston and connecting rod assembly (1) from the cylinder bore.

  22. Remove the bearing (2).
  23. Remove the EN-41556  Connecting Rod Guide (3).
  24. GM5373146Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The bolts are single use and must be discarded before final installation.

    Upon removal of the piston and connecting rod assembly (4), assemble the connecting rod cap (2) and bolts (1) onto the matching connecting rod.

  25. GM5039543Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Position Sensor (2) - Remove

  26. Crankshaft Position Sensor Bolt (1) - Remove
  27. GM5039544Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The crankshaft bearing caps are machined with the engine block, for the proper clearances. Mark or identify each crankshaft bearing cap location and direction before removal. The crankshaft bearing caps MUST be installed to their original position and direction.

    Crankshaft Bearing Cap Bolt- Inner (1) - Remove and DISCARD [ 10x ]

  28. Crankshaft Bearing Cap Bolt- Outer (2) - Remove and DISCARD [ 10x ]
  29. Crankshaft Bearing Cap Bolt - Side (3) - Remove and DISCARD [ 10x ]
  30. GM5039546Courtesy of GENERAL MOTORS COMPANY

    Before removal note the direction of the bearing caps arrows and location.

  31. GM1552495Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

    Install the J-41818  Crankshaft Bearing Cap Remover (2) and tighten to 11 N.m (100 lb/in).

  32. Install the J-6125-1B  Slide Hammer (1) to the J-41818  Crankshaft Bearing Cap Remover (2).
  33. GM5039549Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Use care when handling the crankshaft. Avoid damage to the CKP sensor reluctor ring teeth. Nicks, burrs or other damage to the teeth may affect on-board diagnostics (OBD) II system performance.

    Crankshaft Bearing Cap (1) - Remove

    [ 5x ]

  34. Crankshaft Lower Bearing (2) - Remove [ 5x ]
  35. Crankshaft (3) - Remove
  36. Crankshaft Upper Bearing (4) - Remove [ 5x ]
  37. Mark, sort, or organize the crankshaft bearings so they may be installed to their original position and location.
  38. Lay the crankshaft onto 2 wooden V-blocks or other protective surface.
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