LEMON Manuals: Even more car manuals for everyone
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 >> Engine Block Overhaul >> 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. GM4994654Courtesy of GENERAL MOTORS COMPANY

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

    8. NOTE:

    Do NOT DISCARD the automatic transmission flex plate bolt at this time.

  8. Automatic Transmission Flex Plate Bolt (1) - Remove [ 8x ]
  9. Automatic Transmission Flex Plate (2) - Remove
  10. GM5001783Courtesy of GENERAL MOTORS COMPANY

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

  11. 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.
  12. GM5001778Courtesy of GENERAL MOTORS COMPANY

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

    13. NOTE:

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

  13. Crankshaft Rear Oil Seal Housing (2) - Remove
  14. Crankshaft Rear Oil Seal Housing Gasket (3) - Remove and DISCARD
  15. Crankshaft Rear Oil Seal Housing Locating Pin (4) - Remove
  16. GM4997026Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator (1) - Remove

  17. Oil Level Indicator Tube Bolt (2) - Remove
  18. Oil Level Indicator Tube (3) - Remove
  19. Oil Level Indicator Tube Seal (4) - Remove and DISCARD
  20. 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 ]

  21. Exhaust Manifold Heat Shield - Left Side (3) - Remove [ 3x ]
  22. Exhaust Manifold Bolt (4) - Remove [ 5x ]
  23. Exhaust Manifold- Left Side (5) - Remove
  24. Exhaust Manifold Gasket (6) - Remove and DISCARD
  25. 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 ]

  26. Exhaust Manifold Heat Shield - Right Side (3) - Remove [ 3x ]
  27. Exhaust Manifold Bolt (4) - Remove [ 5x ]
  28. Exhaust Manifold- Right Side (5) - Remove
  29. Exhaust Manifold Gasket (6) - Remove and DISCARD
  30. GM5568606Courtesy of GENERAL MOTORS COMPANY

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

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

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

  33. Fuel Feed Pipe Bolt (2) - Remove
  34. Fuel Feed Intermediate Pipe (3) - Remove and DISCARD
  35. GM5568498Courtesy of GENERAL MOTORS COMPANY

    Fuel Pump Bolt (1) - Remove [ 2x ]

  36. Fuel Pump Cover (2) - Remove
  37. Fuel Pump Bolt Retainer (3) - Remove [ 2x ]
  38. Fuel Pump (4) - Remove
  39. Fuel Pump Bracket Gasket (5) - Remove and DISCARD
  40. 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 (4) from the gas engine ignition spark plug.

  41. Valve Rocker Arm Cover Bolt (1) - Remove [ 19x ]
  42. Valve Rocker Arm Cover (2) - Remove [ 2x ]
  43. Valve Rocker Arm Cover Gasket (3) - Remove and DISCARD [ 2x ]
  44. GM5585083Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

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

  45. Valve Push Rod (2) - Remove [ 16x ]
  46. 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.

  47. Cylinder Head Bolt (2) - Remove and DISCARD
  48. Cylinder Head Bolt (3) - Remove and DISCARD [ 19x ]
  49. Cylinder Head (4) - Remove [ 2x ]
  50. Cylinder Head Gasket (5) - Remove and DISCARD [ 2x ]
  51. GM5567748Courtesy of GENERAL MOTORS COMPANY

    Engine Block Valley Cover Bolt (1) - Remove [ 9x ]

  52. Engine Block Valley Cover (2) - Remove
  53. GM5567750Courtesy of GENERAL MOTORS COMPANY

    Engine Block Valley Cover Gasket (2) @ Engine Block Valley Cover (1) - Remove and DISCARD

  54. GM5035055Courtesy of GENERAL MOTORS COMPANY

    Positive Crankcase Ventilation Oil Separator Bolt (1) - Loosen until disengaged [ 4x ]

  55. Wiring Harness Connector Seal (2) @ Valve Rocker Arm Oil Control Valve Harness (3) - Remove and DISCARD
  56. Valve Rocker Arm Oil Control Valve Harness (3) @ Valve Lifter Oil Solenoid Valve (5) - Disconnect [ 8x ]
  57. Valve Rocker Arm Oil Control Valve Harness (3) - Remove
  58. Valve Rocker Arm Oil Control Valve Bolt (4) - Loosen until disengaged [ 8x ]
  59. Install the EN-52511  FAAFM Oil Control Solenoid Remover (6) to a valve lifter oil solenoid valve (5).
  60. Using the EN-52511  FAAFM Oil Control Solenoid Remover (6) to turn the valve lifter oil solenoid valve and then pull up to remove.
  61. GM4997043Courtesy of GENERAL MOTORS COMPANY

    Valve Lifter Follower Guide Bolt (1) - Remove

  62. Valve Lifter Follower Guide (2) - Remove
  63. Valve Lifter Follower (3) - Remove
  64. GM4997057Courtesy of GENERAL MOTORS COMPANY

    Valve Lifter Guide Bolt (1) - Remove [ 4x ]

  65. Valve Lifter Guide & Valve Lifter (2) - Remove
  66. Rotate the engine over on the engine stand.
  67. GM4997027Courtesy of GENERAL MOTORS COMPANY

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

  68. Oil Pan (3) - Remove
  69. Rotate the engine over on the engine stand.
  70. GM4994637Courtesy of GENERAL MOTORS COMPANY

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

  71. 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.
  72. GM4994647Courtesy of GENERAL MOTORS COMPANY

    Camshaft Position Sensor Bracket Bolt (1) - Remove [ 2x ]

  73. Camshaft Position Sensor Wire (2) - Remove
  74. Camshaft Position Sensor (3) - Remove
  75. Camshaft Position Actuator Magnet Bolt (4) - Remove [ 3x ]
  76. Camshaft Position Actuator Magnet (5) - Remove
  77. Camshaft Position Actuator Magnet Gasket (6) - Remove and DISCARD
  78. GM5001122Courtesy of GENERAL MOTORS COMPANY

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

  79. Engine Front Cover Bolt (2) - Remove [ 8x ]
  80. Engine Front Cover Bolt (3) - Remove [ 2x ]
    81. NOTE:

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

  81. Engine Front Cover (4) Remove
  82. GM5001776Courtesy of GENERAL MOTORS COMPANY

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

  83. Oil Pump (2) - Remove
  84. GM4994654Courtesy 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.
    • Do not apply threadlock to the flex plate bolts at this time.

    Automatic Transmission Flex Plate (2) - Install

  85. Automatic Transmission Flex Plate Bolt (1) - Install and hand tighten [ 8x ]
  86. GM5001787Courtesy of GENERAL MOTORS COMPANY

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

  87. 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)
  88. GM5001788Courtesy of GENERAL MOTORS COMPANY

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

  89. 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.

  90. GM5001790Courtesy of GENERAL MOTORS COMPANY

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

  91. 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.

  92. GM5001794Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Tensioner Bolt [ 2x ] (1) - Remove

  93. Timing Chain Tensioner (2) - Remove
  94. GM5001795Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Sprocket (1) - Remove

  95. Crankshaft Balancer Key (2) - Remove
  96. GM4994654Courtesy of GENERAL MOTORS COMPANY

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

  97. Automatic Transmission Flex Plate (2) Remove.
  98. EN - 42386-A  Flywheel Holding Tool - Remove
  99. GM5001773Courtesy of GENERAL MOTORS COMPANY

    Camshaft Retainer Bolt (1) - Remove [ 4x ]

  100. Camshaft Retainer (2) - Remove
  101. Camshaft (3) - Remove
  102. 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 (1) 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.
  103. 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.
  104. 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.

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

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

  107. 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.

  108. Remove the EN-41556  Connecting Rod Guide (3).
  109. GM5373146Courtesy of GENERAL MOTORS COMPANY

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

  110. GM5039543Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Position Sensor Bolt (1) - Remove

  111. Crankshaft Position Sensor (2) - Remove
  112. 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 ]

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

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

  116. 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).

  117. Install the J-6125-1B  Slide Hammer (1) to the J-41818  Crankshaft Bearing Cap Remover (2).
  118. 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 ]

  119. Crankshaft Lower Bearing (2) - Remove [ 5x ]
  120. Crankshaft (3) - Remove
  121. Crankshaft Upper Bearing (4) - Remove [ 5x ]
  122. Mark, sort, or organize the crankshaft bearings so they may be installed to their original position and location.
  123. Lay the crankshaft onto 2 wooden V-blocks or other protective surface.
  124. GM5019862Courtesy of GENERAL MOTORS COMPANY

    Knock Sensor Heat Shield Bolt (1) - Remove

  125. Knock Sensor Heat Shield (2) - Remove
  126. Knock Sensor Bolt (3) - Remove
  127. Knock Sensor (4) - Remove
  128. GM5572858Courtesy of GENERAL MOTORS COMPANY

    Knock Sensor Bolt (1) - Remove

  129. Knock Sensor (2) - Remove
  130. GM5366222Courtesy of GENERAL MOTORS COMPANY

    Cylinder Head Locating Pin (1) - Remove [ 4x ]

  131. Transmission Locating Pin (2) - Remove [ 2x ]
  132. Engine Block Oil Gallery Plug Seal (3) - Remove and DISCARD
  133. Engine Block Oil Gallery Plug (4) - Remove
  134. Engine Block Coolant Drain Hole Plug (5) - Remove
  135. Engine Block Oil Gallery Plug (6) - Remove
  136. Engine Block Oil Gallery Plug (7) - Remove
    137. NOTE:

    A loose camshaft bearing may be caused by an enlarged, out of round, or damaged engine block bearing bore.

  137. Prior to bearing removal, inspect the camshaft bearings for loose fit in the engine block bearing bores.
  138. Repair or replace the components, as required.
  139. GM5372343Courtesy of GENERAL MOTORS COMPANY

    Select the expanding driver (4 - 8) and washer (2 or 3) from the EN-33049  Camshaft Bearing Service Set.

  140. Assemble the tool.
  141. Insert the tool through the front of the engine block and into the bearing.
  142. Tighten the expander assembly (11) nut until snug.
  143. Push the guide cone (1) into the front camshaft bearing in order to align the tool.
  144. GM5372363Courtesy of GENERAL MOTORS COMPANY

    Drive the bearing (1) from the block bore.

    145. NOTE:

    In order to remove the inner camshaft bearings, operate the tool from either end of the block, using the driver bar extension and the guide cone in the front or rear camshaft bearing bore.

  145. Repeat the above procedures in order to remove the remaining bearings.
scientia non olet · About LEMON Manuals