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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions (11 Of 11) >> Repair Instructions >> Crankshaft and Bearing Removal and Installation >> Disassemble Procedure

Disassemble Procedure

  1. GM5001787Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

    EN-42386-A  Flywheel Holding Tool (1) - Install

  2. Use one M10 - 1.5 x 120 mm and one M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the EN-42386-A  Flywheel Holding Tool bolts to 50 N.m (37 lb ft)
  3. GM4994636Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT DISCARD the crankshaft balancer bolt at this time.

    Crankshaft Balancer Bolt (1) - Remove

  4. EN-41816-5  Crankshaft End Protector (3) - Install
  5. EN-41816-A  Crankshaft Balancer Remover (4) - Install
  6. Crankshaft Balancer (2) - Remove
  7. Rotate the engine over on the engine stand.
  8. GM4997027Courtesy of GENERAL MOTORS COMPANY

    Oil Pan Bolt (1) - Remove [14x]

  9. Oil Pan Bolt (2) - Remove [2x]
  10. Oil Pan (3) - Remove
  11. GM5577670Courtesy of GENERAL MOTORS COMPANY

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

  12. Oil Pan Front Seal (3) - Remove and DISCARD
  13. Rotate the engine over on the engine stand.
  14. GM4994637Courtesy of GENERAL MOTORS COMPANY

    Install the EN-51096  Crankshaft Rear Seal Remover onto GE-23907-1  Slide Hammer.

  15. Slide the small bend of EN-51096  Crankshaft Rear Seal Remover between the lip of the front seal (1) and crankshaft. Ensure that the small bend of EN-51096  Crankshaft Rear Seal Remover engages the rear side of the front seal (1). While rotating EN-51096  Crankshaft Rear Seal Remover and GE-23907-1  Slide Hammer around the seal, use the slide hammer to remove and DISCARD the seal.
  16. GM5001122Courtesy of GENERAL MOTORS COMPANY

    {If equipped} Disconnect the oil pump flow control solenoid wire (1).

  17. Engine Front Cover Bolt (2) - Remove [8x]
  18. Engine Front Cover Bolt (3) - Remove [2x]
    19. NOTE:

    Use pry points to separate the engine front cover from the block.

  19. Engine Front Cover (4) Remove
  20. GM5001776Courtesy of GENERAL MOTORS COMPANY

    Oil Pump Bolt (1) - Remove [4x]

  21. Oil Pump (2) - Remove
  22. GM5001788Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do not use the camshaft position actuator solenoid valve again. Upon installation of the camshaft position actuator and timing chain, install a NEW valve.

    Camshaft Position Actuator Solenoid Valve (1) - Remove and DISCARD

  23. GM5001793Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Camshaft Position Actuator Removal and Installation Warning .

    Loosen and separate the camshaft position actuator and timing chain from the camshaft. Position fingers behind the actuator sprocket and pull the actuator away from the front of the camshaft. Never pull on the reluctor wheel when attempting to remove the actuator.

  24. GM5001790Courtesy of GENERAL MOTORS COMPANY

    Remove the camshaft position actuator solenoid valve (1) and timing chain (2).

  25. GM1714946Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Camshaft Position Actuator Removal and Installation Warning .

    Insert a tie strap (1) through the center of the camshaft position (camshaft position) actuator and over the reluctor wheel.

  26. GM5001795Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Sprocket (1) - Remove

  27. GM4994654Courtesy of GENERAL MOTORS COMPANY

    Mark or scribe the end of the crankshaft and the flex plate before removal.

  28. Automatic Transmission Flex Plate Bolt (1) - Loosen [8x]
  29. GM5001787Courtesy of GENERAL MOTORS COMPANY

    Remove the M10 - 1.5 x 120 mm and M10 - 1.5 x 45 mm bolts.

  30. EN-42386-A  Flywheel Holding Tool (1) - Remove
  31. GM4994654Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Flex Plate Bolt (1) - Remove and DISCARD [8x]

  32. Automatic Transmission Flex Plate (2) - Remove
  33. GM5001783Courtesy of GENERAL MOTORS COMPANY

    Install the EN-51096  Crankshaft Rear Seal Remover (2) onto GE-23907-1  Slide Hammer (3).

  34. Slide the small bend of EN-51096  Crankshaft Rear Seal Remover between the lip of the rear seal (1) and crankshaft. Ensure that the small bend of EN-51096  Crankshaft Rear Seal Remover (2) engages the rear side of the rear seal (1). While rotating EN-51096  Crankshaft Rear Seal Remover (2) and GE-23907-1  Slide Hammer (3) around the seal, use the slide hammer to remove and DISCARD the seal.
  35. GM5001778Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Rear Oil Seal Housing Bolt (1) - Remove [12x]

    36. NOTE:

    Use pry points to separate the crankshaft rear oil seal housing from the block.

  36. Crankshaft Rear Oil Seal Housing (2) - Remove
  37. Crankshaft Rear Oil Seal Housing Gasket (3) - Remove and DISCARD
  38. GM4997026Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator (1) - Remove

  39. Oil Level Indicator Tube Bolt (2) - Remove
  40. Oil Level Indicator Tube (3) - Remove
  41. Oil Level Indicator Tube Seal (4) - Remove and DISCARD
  42. GM6178912Courtesy 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 wires for damage and replace if necessary.

    Twist the 8 spark plug wire boots a 1/2 turn and remove the spark plug wires from the gas engine ignition spark plugs.

  43. GM4994649Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Spark plug wires will be removed with the valve rocker arm covers.

    Exhaust Manifold Heat Shield Bolt (2) - Remove [3x]

  44. Exhaust Manifold Heat Shield - Left Side (3) - Remove [3x]
  45. Exhaust Manifold Bolt (4) - Remove [5x]
  46. Exhaust Manifold- Left Side (5) - Remove
  47. Exhaust Manifold Gasket (6) - Remove and DISCARD
  48. GM4994650Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Spark plug wires will be removed with the valve rocker arm covers.

    Exhaust Manifold Heat Shield Bolt (2) - Remove [3x]

  49. Exhaust Manifold Heat Shield - Right Side (3) - Remove [3x]
  50. Exhaust Manifold Bolt (4) - Remove [5x]
  51. Exhaust Manifold- Right Side (5) - Remove
  52. Exhaust Manifold Gasket (6) - Remove and DISCARD
  53. GM5568606Courtesy of GENERAL MOTORS COMPANY

    Fuel Feed Intermediate Pipe Nut (1) @Fuel Feed Intermediate Pipe (2) - Loosen until disengaged [2x]

  54. Fuel Feed Intermediate Pipe (2) - Remove and DISCARD
  55. GM5612992Courtesy of GENERAL MOTORS COMPANY

    Fuel Feed Intermediate Pipe Nut (1) @Fuel Feed Intermediate Pipe (3) - Loosen until disengaged [2x]

  56. Fuel Feed Pipe Bolt (2) - Remove
  57. Fuel Feed Intermediate Pipe (3) - Remove and DISCARD
  58. GM5000805Courtesy of GENERAL MOTORS COMPANY

    Remove the fuel feed pipe bolt (1) and disconnect the fuel feed pipe (2) from the fuel pump. Metal Collar Quick Connect Fitting Service

  59. 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.

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

    Left side shown, right side similar.

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

  64. Valve Push Rod (2) - Remove [16x]
  65. 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.

  66. Cylinder Head Bolt (2) - Remove and DISCARD
  67. Cylinder Head Bolt (3) - Remove and DISCARD [19x]
  68. Cylinder Head (4) - Remove [2x]
  69. Cylinder Head Gasket (5) - Remove and DISCARD [2x]
  70. 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.
  71. 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.
  72. 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.

    73. NOTE:

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

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

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

  75. 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.

  76. Remove the bearing (2).
  77. Remove the EN-41556  Connecting Rod Guide (3).
  78. 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.

  79. GM5039543Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Position Sensor Bolt (1) - Remove

  80. Crankshaft Position Sensor (2) - Remove
  81. 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]

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

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

  85. GM1552495Courtesy of GENERAL MOTORS COMPANY

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

  86. Install the J-6125-1B  Slide Hammer (1) to the J-41818  Crankshaft Bearing Cap Remover (2).
  87. 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]

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