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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Mechanical - 3.0L (Lm2) Diesel - Repair Instructions (3 Of 11)) >> Repair Instructions >> Cylinder Head Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    Use all components included with the service kit.

  1. Engine - Remove - Engine Removal and Installation (F48 & RC1 - F47) , or Engine Removal and Installation (RWL & RC1 - F47) , or Engine Removal and Installation (F48 & RC1 & F47) , or Engine Removal and Installation (RWL & RC1 & F47) , or Engine Removal and Installation (F48 & WTX & F47) , or Engine Removal and Installation (RWL & WTX & F47) , or Engine Removal and Installation (F48 & WTX - F47) , or Engine Removal and Installation (RWL & WTX - F47)
  2. GM5207474Courtesy of GENERAL MOTORS COMPANY

    EN-52449  Engine Stand Adapter (2) @Engine Block - Install

  3. Engine@ EN-52449  Adapter (2) - Install the engine to a suitable engine stand.
  4. Remove the EN-52474  Engine Lift Bracket Set.
  5. GM5137110Courtesy of GENERAL MOTORS COMPANY

    Install the EN-49979  Crankshaft Holder (1) with EN-956-1  Extension (3).

  6. Crankshaft Pulley Bolt (2) - Loosen [4x]
  7. GM5133550Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Flex Plate Bolt (2) - Remove and DISCARD [8x]

  8. Automatic Transmission Flex Plate (1) - Remove
  9. GM5137110Courtesy of GENERAL MOTORS COMPANY

    Remove the EN-49979  Crankshaft Holder (1) with EN-956-1  Extension (3).

  10. GM5137111Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Pulley Bolt (2) - Remove [4x]

  11. Crankshaft Pulley (1) - Remove
  12. GM5190250Courtesy of GENERAL MOTORS COMPANY

    Engine Front Cover Bolt (1) - Remove [8x]

  13. NOTE:

    It is likely you will bend the crankshaft front oil seal during the removal. Use care to not damage the engine block.

  14. Crankshaft Front Oil Seal (2) - Remove and DISCARD
  15. GM5214756Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Pulley Bolt (1) - Install and hand tighten [4x]

  16. Rotate the crankshaft with a suitable tool in the direction of the arrow at the crankshaft pulley bolts (1), until the following alignment is achieved:
    • The crankshaft locking divot (2) aligns with the engine block (3)
    • The crankshaft timing mark, dimension a, is at 40 degrees TDC
  17. NOTE:

    Once the EN-52586  Crankshaft Fixing Pin is installed, do not remove until all timing components have been installed.

  18. Install the EN-52586  Crankshaft Fixing Pin (4).
  19. GM5389340Courtesy of GENERAL MOTORS COMPANY

    Remove the 16 timing chain cover bolts (1, 2).

  20. GM5389368Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Avoid prying close to the transmission pins.

    Using a suitable tool at the locations indicated by the arrows to pry, loosen the timing chain lower cover carefully from the engine block.

  21. GM5145911Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Lower Cover (1) - Remove and DISCARD

  22. GM5135087Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise canceling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.

    Camshaft Housing Cover Insulator (1) - Remove

  23. GM5156855Courtesy of GENERAL MOTORS COMPANY

    Remove the 2 high pressure diesel fuel feed to rail pipe bracket bolts (1).

  24. Unclip the fuel injector fuel return pipe retainer (2).
  25. GM5156867Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 2 high pressure diesel fuel feed to rail pipe fittings (1) from the high pressure diesel fuel injection rail.

  26. GM5156838Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 2 high pressure diesel fuel feed to rail pipe fittings (1) from the high pressure diesel fuel pump.

  27. GM5156840Courtesy of GENERAL MOTORS COMPANY

    Fuel Feed Pipe Clip Bolt (1) - Remove

  28. Fuel Return Pipe Clip Bolt (2) - Remove
  29. GM5154341Courtesy of GENERAL MOTORS COMPANY

    Diesel Fuel Separator Bracket Bolt (1) - Remove

  30. GM5628961Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT reuse the high pressure diesel fuel feed pipes.

    Remove the high pressure diesel fuel feed to rail pipe (2) and DISCARD.

  31. GM5223903Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Fuel Feed Pipe Bracket Bolt (1) - Remove [2x]

  32. Fuel Injector Fuel Return Hose Bracket (2) Remove
  33. GM5158555Courtesy of GENERAL MOTORS COMPANY

    Remove the fuel injection fuel feed pipe bracket bolt (1).

  34. Remove the fuel injection fuel feed pipe bracket (2).
  35. GM5158567Courtesy of GENERAL MOTORS COMPANY

    Loosen the 12 high pressure diesel fuel feed pipe nuts (1) from the fuel injectors and the fuel injection rail.

  36. NOTE:

    Do NOT reuse the high pressure diesel fuel feed pipes.

  37. Remove and DISCARD the 6 high pressure diesel fuel feed to injector pipes (2).
  38. GM5621181Courtesy of GENERAL MOTORS COMPANY

    Disconnect and reposition the fuel injector wiring harness, as needed.

  39. Retainer (3) - Disengage
  40. Fuel Injection Fuel Return Pipe Locking Spring (4) - Disengage [6x]
  41. GM5621182Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Fuel Return Pipe (1) - Reposition

  42. GM5159300Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 6 high pressure diesel fuel injector electrical connectors (1).

  43. Disconnect the 8 fuel injector wiring harness retainers (2) and reposition the fuel injector wiring harness out of the way.
  44. GM5136920Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Bolt (1) - Remove [6x]

  45. Multiport Fuel Injector Bracket (2) - Remove [6x]
  46. GM5136921Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Mark the location of the high pressure diesel fuel injectors.

    Using the EN-52451  Fuel Injector Remover (3) and EN-51146-1-3  Sliding Hammer (1), remove the 6 high pressure diesel fuel injectors (2).

  47. GM5136923Courtesy of GENERAL MOTORS COMPANY

    Remove and DISCARD the 6 fuel injector seal rings (2) and 6 fuel injector washers (3).

  48. GM5203904Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Wiring Harness Retainer (3) @Engine Coolant Air Bleed Hose - Separate [2x]

  49. Remove the wiring harness.
  50. GM5203915Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Engine Coolant Air Bleed Pipe Bolt (1) - Remove [2x]

  51. Engine Coolant Air Bleed Hose Stud (2) - Remove
  52. Engine Coolant Air Bleed Hose (3) - Remove
  53. GM5609033Courtesy of GENERAL MOTORS COMPANY

    Turbocharger Coolant Feed and Return Pipe Gasket (1) - Remove and DISCARD [2x]

  54. GM5135103Courtesy of GENERAL MOTORS COMPANY

    Positive Crankcase Ventilation Hose Clamp (1) - Release [2x] - Hose Clamp Replacement Guidelines - Spring Type

  55. Positive Crankcase Ventilation Hose (2) - Remove
  56. GM5795384Courtesy of GENERAL MOTORS COMPANY

    Exhaust Gas Recirculation Valve Bracket Nut (1) - Remove

  57. GM5135382Courtesy of GENERAL MOTORS COMPANY

    Exhaust Gas Recirculation Valve Bolt (1) - Remove [2x]

  58. Remove the exhaust gas recirculation valve (2) and exhaust gas recirculation cooler inlet pipe as an assembly.
  59. Exhaust Gas Recirculation Valve Inlet Gasket (3) - Remove and DISCARD
  60. GM5136702Courtesy of GENERAL MOTORS COMPANY

    Turbocharger Oil Return Pipe Bolt (7) - Remove [2x]

  61. Lower Crankcase Extension Bolt (9) Remove
  62. Turbocharger Oil Return Pipe Bolt (8) - Remove [2x]
  63. Turbocharger Nut (2, 4) - Remove and DISCARD [3x]
  64. Turbocharger Assembly (1) - Remove
  65. Turbocharger Gasket (3) - Remove and DISCARD
  66. Turbocharger Oil Return Pipe Gasket (6) - Remove and DISCARD
  67. Turbocharger Oil Return Pipe Gasket (5) - Remove and DISCARD
  68. GM5136722Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Heat Shield Bolt (2) - Remove

  69. Exhaust Manifold Heat Shield (1) Remove
  70. GM5136724Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Flange Bolt (3) - Remove [12x]

  71. Exhaust Manifold (2) - Remove
  72. Exhaust Manifold Gasket (1) - Remove and DISCARD
  73. GM5613883Courtesy of GENERAL MOTORS COMPANY

    Intake Air Pressure and Temperature Sensor Bolt (1) - Remove

  74. Intake Air Pressure and Temperature Sensor (2) - Remove
  75. GM5160480Courtesy of GENERAL MOTORS COMPANY

    Disconnect and remove the glow plug wiring harness (1).

  76. Detach the wiring harness retainers from the intake manifold.
  77. GM5160483Courtesy of GENERAL MOTORS COMPANY

    Remove the 3 high pressure diesel fuel injection rail nuts (1).

  78. GM5160608Courtesy of GENERAL MOTORS COMPANY

    Remove the high pressure diesel fuel injection rail (1).

  79. Charge Air Cooler Bracket - Remove
  80. GM5227671Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Fuel Rail Stud (1) - Remove [3x]

  81. GM5136780Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover Retainer (2) - Remove [2x]

  82. WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise canceling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.

  83. Intake Manifold Cover (1) - Remove
  84. GM5136785Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Bolt (2) - Remove [9x]

  85. Intake Manifold (1) - Remove
  86. Intake Manifold Gasket (3) Remove and DISCARD [6x]
  87. GM5222242Courtesy of GENERAL MOTORS COMPANY

    Camshaft Housing Cover Bolt (1) - Loosen [7x]

  88. Camshaft Housing Cover Bolt (2) - Loosen [3x]
  89. Camshaft Housing Cover Bolt (3) - Loosen [9x]
  90. Camshaft Housing Cover Bolt (4) - Loosen [7x]
  91. GM5138527Courtesy of GENERAL MOTORS COMPANY

    Camshaft Cover (1) - Remove

  92. Camshaft Housing Gasket (2) - Remove and DISCARD [2x]
  93. Camshaft Housing Cover Insulator (3) - Remove and DISCARD [26x]
  94. GM5138598Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Glow plugs must be discarded whenever removed, and replaced with NEW.
    • If the cylinder head is removed, the accompanying glow plugs must be discarded and replaced with NEW.
    • Handle with extreme care, do not allow glow plugs to touch each other.

    Glow Plug (1) - Remove and DISCARD [6x]

  95. Inspect each glow plug tip and ensure the glow plug is not broken. If a broken tip is suspected, inspect the combustion chamber for the glow plug tip.
  96. GM5138708Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Cover Bolt (3) - Remove [4x]

  97. Timing Chain Cover Bolt (4) - Remove [2x]
  98. Timing Chain Upper Cover (1) @Cylinder Head - Remove
  99. GM5191770Courtesy of GENERAL MOTORS COMPANY

    Camshaft Position Sensor Bolt (1) - Remove

  100. Camshaft Position Sensor (2) - Remove
  101. GM5144300Courtesy of GENERAL MOTORS COMPANY

    Cylinder Head Temperature Sensor (1) - Remove

  102. GM5147527Courtesy of GENERAL MOTORS COMPANY

    Ensure that the camshaft notches (1) are in the 12 o'clock position.

  103. GM5214756Courtesy of GENERAL MOTORS COMPANY

    If the camshaft notches are not in the 12 o'clock position, remove the EN-52586  Crankshaft Fixing Pin and rotate the crankshaft until the camshaft notch is in the 12 o'clock position, and the crankshaft aligns with the EN-52586  Crankshaft Fixing Pin locking location.

  104. Install the EN-52586  Crankshaft Fixing Pin (4).
  105. GM5147734Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52445-1  Camshaft Tool (3) to the camshaft housing.

  106. Check that the tab (1) of the EN-52445-1  Camshaft Tool sits correctly under the camshaft bearing rear cap (2).
  107. Check that the pins (6) of the EN-52445-1  Camshaft Tool sit correctly in the camshafts (5).
  108. GM5147723Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52445-2  Camshaft Tool (1) on the camshafts.

  109. GM5146036Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Tensioner (2) - Remove

  110. Timing Chain Tensioner Gasket (1) - Remove and DISCARD
  111. GM5147813Courtesy of GENERAL MOTORS COMPANY

    Push the timing chain guide (1) in direction of the arrow to compress the tensioner piston.

  112. Install one EN-52234  Timing Chain Tensioner Retaining Pin (2) to lock the timing chain tensioner in position.
  113. GM5145742Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Guide Bolt (2) - Remove [2x]

  114. Timing Chain Guide (1) - Remove
  115. GM5147541Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket Bolt (3) - Remove and DISCARD

  116. Camshaft Position Sensor Exciter Wheel (1) - Remove
  117. Camshaft Sprocket (2) - Remove
  118. GM5146077Courtesy of GENERAL MOTORS COMPANY

    Secondary Timing Chain (1) - Remove

  119. GM5146206Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket Bolt (1) - Remove and DISCARD

  120. Camshaft Sprocket (2) - Remove
  121. GM5147442Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Tensioner Shoe Bolt (2) - Remove

  122. Timing Chain Guide (1) - Remove
  123. GM5870220Courtesy of GENERAL MOTORS COMPANY

    Camshaft Housing Bolt (1) - Loosen in sequence [16x] - Fastener Specifications

  124. Camshaft Housing Bolt (1) - Remove [16x]
  125. GM5147728Courtesy of GENERAL MOTORS COMPANY

    Install the 2 J-43301  Coil Pack Pullers (1).

  126. GM6049696Courtesy of GENERAL MOTORS COMPANY

    Loosen the 6 bolts (1) of the EN-52445-1  Camshaft Tool a half-turn each in sequence, until disengaged from the cylinder head.

  127. GM5147729Courtesy of GENERAL MOTORS COMPANY

    Using the J-43301  Coil Pack Pullers (2), remove the camshaft housing (1).

  128. Camshaft Housing Gasket (3) - Remove and DISCARD [5x]
  129. Camshaft Housing Gasket (4) - Remove and DISCARD
  130. GM5147723Courtesy of GENERAL MOTORS COMPANY

    Remove the EN-52445-2  Camshaft Tool (1) from the camshafts.

  131. GM5147734Courtesy of GENERAL MOTORS COMPANY

    Remove the EN-52445-1  Camshaft Tool (3) from the camshaft housing.

  132. GM5867315Courtesy of GENERAL MOTORS COMPANY

    Camshaft Bearing Cap Bolt (1) - Remove [16x]

  133. GM5148177Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Many internal engine components will develop specific wear patterns on their friction surfaces.
    • Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.
    • Tag or mark each part immediately when removed. Indicate the location, direction, or orientation when necessary.

    Camshaft Bearing Rear Cap (1) - Remove

  134. Camshaft Bearing Cap (2) - Remove [6x]
  135. Intake Camshaft (4) - Remove
  136. GM5872270Courtesy of GENERAL MOTORS COMPANY

    Camshaft Bearing Cap Bolt (1) - Remove [12x]

  137. GM5148177Courtesy of GENERAL MOTORS COMPANY

    Camshaft Bearing Cap (2) - Remove [6x]

  138. Exhaust Camshaft (3) - Remove
  139. GM5149797Courtesy of GENERAL MOTORS COMPANY

    Loosen the 17 cylinder head bolts (1, 2) in sequence.

  140. Cylinder Head Bolt (1) - Remove and DISCARD [14x]
  141. Cylinder Head Bolt (2) - Remove [3x]
  142. GM5149800Courtesy of GENERAL MOTORS COMPANY

    Cylinder Head (1) - Remove

  143. Cylinder Head Gasket (2) - Remove and DISCARD
  144. Using the appropriate tool, clean and prepare the applicable sealing surface.