LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 170 (Engine Mechanical - 2.7L (L3B) - Repair Instructions (2 Of 3)) >> Repair Instructions >> Cylinder Head Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. GM5456746

    Intake Manifold Cover Bolt (1) - Remove

  2. GM5456829

    Intake Manifold Cover Insulator (1) - Remove

  3. WARNING:

    Refer to Diesel/Gasoline Vapors Warning .

    WARNING:

    Refer to Safety Glasses Warning .

  4. Relieve the fuel system pressure. Fuel Pressure Relief
  5. Drain the coolant. Refer to Cooling System Draining and Filling (L3B Static Fill) , or Cooling System Draining and Filling (L3B GE 47716)
  6. Drain the engine oil. Engine Oil and Oil Filter Replacement (RWD) , or Engine Oil and Oil Filter Replacement (AWD)
  7. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
  8. Install the engine support fixture. Engine Support Fixture
  9. GM5129466

    Fuel Feed Pipe Bolt (1) - Remove

  10. GM5129475

    Disconnect the fuel feed pipe (1) from the fuel pump and the fuel feed pipe - underbody. Metal Collar Quick Connect Fitting Service

  11. Fuel Feed Pipe (1) - Remove
  12. GM5457059

    Electrical Connector (1) - Disconnect [5x]

  13. Wiring Harness (2) - Reposition
  14. GM5515361

    Retainer (1) @ Upper Intake Manifold Bracket (2) - Unclip [2x]

  15. GM5457857

    Upper Intake Manifold Cover Nut (1) - Remove [2x]

  16. Radiator Surge Tank Inlet Hose Clip (2) @ Upper Intake Manifold Bracket (3) - Remove
  17. GM5457786

    Upper Intake Manifold Cover Nut (1) - Remove [2x]

  18. Upper Intake Manifold Bracket (2) - Remove
  19. GM5395515

    Evaporative Emission Canister Purge Tube (1) - Remove - Plastic Collar Quick Connect Fitting Service

  20. GM5404490

    Disconnect the electrical connectors.

  21. Ignition Coil Bolt (1) - Remove [8x]
  22. Ignition Coil (2) - Remove [4x]
  23. GM5512092

    Electrical Connector (1) - Disconnect [2x]

  24. Retainer (2) - Unclip [5x]
  25. Engine Wiring Harness (3) - Reposition
  26. Positive Crankcase Ventilation Tube (4) - Disconnect - Plastic Collar Quick Connect Fitting Service
  27. GM5512093

    Retainer (1) - Unclip

  28. GM5398955

    Air Cleaner Outlet Duct Clamp (1) - Loosen [2x]

  29. Positive Crankcase Ventilation Tube (3) - Disconnect - Plastic Collar Quick Connect Fitting Service
  30. GM5398967

    Air Cleaner Outlet Duct (1) - Remove

  31. If replacing air cleaner outlet duct transfer parts as necessary.
  32. GM5399053

    Air Cleaner Bolt (1) - Remove

  33. GM5399073

    Air Cleaner Assembly (1) - Remove

  34. GM5145421

    Intake Manifold Cover Bolt (1) - Remove [2x]

  35. Disconnect the electrical connectors.
    • Intake Air Pressure and Temperature Sensor (3)
    • Throttle Body (4)
  36. GM5517399

    Wiring Harness Retainer (2) - Disconnect [2x]

  37. Reposition the engine wiring harness away from the intake manifold.
  38. GM5475553

    Radiator Surge Tank Inlet Hose Clip (3) - Remove [4x]

  39. Radiator Surge Tank Hose Clamp (1) - Disengage - Hose Clamp Replacement Guidelines - Spring Type
  40. Radiator Surge Tank Inlet Hose (2) - Remove
  41. GM5517402

    Wiring Harness Retainer (1) - Disconnect

  42. GM5478561

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

  43. Fuel Pump Shield Bolt (2) - Remove [2x]
  44. Fuel Injection Pump Bracket (3) - Remove
  45. GM5478583
    WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling 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.

    Fuel Pump Insulator (1) - Remove

  46. GM5404598

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

  47. GM5404599

    Fuel Injection Fuel Feed Pipe Bracket Bolt (1) - Remove

  48. Fuel Feed Intermediate Pipe (2) - Remove and DISCARD
  49. Electrical Connector @ Fuel Pump - Disconnect
  50. GM5003980
    CAUTION:

    Alternately loosen the fuel pump bolts one turn at a time until the pump is fully disengaged from fuel pump lifter follower. Trying to remove the pump bolts without even side-to-side loosening may result in pump plunger damage

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

  51. Fuel Pump (2) - Remove
  52. Fuel Pump Seal (3) - Remove and DISCARD
  53. Valve Lifter Follower (4) - Remove
  54. GM5399157

    Retainer Spring (1) - Release

  55. Charge Air Cooler Outlet Air Tube (2) @ Throttle Body (3) - Remove
  56. GM5517398

    Wiring Harness Retainer (1) @ Evaporative Emission Canister Purge Pump Bracket (2) - Unclip

  57. GM5402098

    Evaporative Emission Canister Purge Pump Bolt (1) - Remove [3x]

  58. Evaporative Emission Canister Purge Pump (2) - Remove
  59. GM5003920

    Oil Level Indicator (4) - Remove

  60. Oil Level Indicator Tube Bracket Bolt (1) - Remove
  61. Oil Level Indicator Tube (2) - Remove
  62. Oil Level Indicator Tube Seal (3) - Remove and DISCARD
  63. GM5145608

    Intake Manifold Cover (1) - Remove

  64. GM5145544

    Intake Manifold Bolt (1) - Remove [6x]

  65. Intake Manifold (2) - Remove
  66. GM5045008

    Intake Manifold Gasket (3) - Remove and DISCARD [4x]

  67. Crankcase Vent Passage Seal (4) - Remove and DISCARD
  68. GM5143856

    Hose Clamp (1) - Disengage [3x] - Hose Clamp Replacement Guidelines - Spring Type

  69. Engine Coolant Flow Control Valve Hose (2) @ Engine Coolant Flow Control Valve - Remove
  70. Engine Oil Cooler Coolant Inlet Hose (3) @ Engine Coolant Flow Control Valve - Remove
  71. Radiator Inlet Hose (4) @ Engine Coolant Flow Control Valve - Remove
  72. GM5517035

    Hose Clamp (1) - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  73. Thermostat Bypass Hose (2) @ Engine Coolant Flow Control Valve - Remove
  74. Disengage the hose clamp (3) and slide it towards the rear of the thermostat bypass hose. Hose Clamp Replacement Guidelines - Spring Type
  75. GM5143899

    Electrical Connector (1) @ Engine Coolant Flow Control Valve - Disconnect [2x]

  76. Engine Coolant Temperature Sensor Electrical Connector (2) @ Engine Coolant Flow Control Valve - Disconnect
  77. GM5472821

    Place shop cloths beneath the radiator surge tank inlet hose connection points to absorb any potential coolant spillage.

  78. Radiator Surge Tank Inlet Hose Clamp (1) - Disengage [3x] - Hose Clamp Replacement Guidelines - Spring Type
  79. Radiator Surge Tank Inlet Hose (2) - Remove
  80. GM5156644

    Engine Wiring Harness Bracket Nut (1) - Remove [2x]

  81. Engine Wiring Harness Bracket (2) - Remove
  82. GM5135183

    Exhaust Manifold Outlet Pipe Bolt (1) - Remove

  83. GM5135192

    Exhaust Manifold Outlet Pipe Bolt (1) - Remove [2x]

  84. Exhaust Manifold Outlet Pipe (2) - Remove
  85. Exhaust Manifold Outlet Pipe Gasket (3) - Remove and DISCARD
  86. GM5141724

    Engine Coolant Thermostat Housing Bracket Bolt (1) - Remove

  87. GM5144011

    Engine Coolant Flow Control Valve Bolt (1) - Remove [5x]

  88. GM5144023

    Separate the engine coolant flow control valve (1) from the thermostat bypass hose and remove the engine coolant flow control valve.

  89. Engine Coolant Flow Control Valve Seal (2) - Remove and DISCARD
  90. GM5132483
    WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling 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.

    Fuel Injection Fuel Rail Noise Shield (1) - Remove

  91. GM5417233

    Auxiliary Generator Battery Jumper Cable Terminal Nut (1) - Remove

  92. Auxiliary Generator Battery Jumper Cable (2) - Reposition away
  93. Retainer (3) - Disengage
  94. GM5417249

    Starter Stud (1) - Remove

  95. Starter Bolt (2) - Remove [2x]
  96. Reposition the starter to gain access to the electrical connections.
  97. GM5417288

    Battery Positive Cable Nut (1) @ Starter Solenoid - Remove

  98. Auxiliary Generator Battery Jumper Cable (2) - Remove
  99. Electrical Connector (4) - Disconnect
  100. Starter (3) - Remove
  101. GM5399121
    CAUTION:

    The use of excessive force may damage the threads in the exhaust manifold/pipe.

    NOTE:

    The heated oxygen sensor MAY be difficult to remove when the engine temperature is less than 48°C (120°F).

    NOTE:

    The heated oxygen sensor in-line connector and louvered end MUST be kept clear of all grease, dirt, and other contaminants. Do NOT use cleaning solvents of any type. Do NOT drop or roughly handle the sensor.

    Disconnect and reposition electrical connectors as necessary.

  102. Using the appropriate tool, remove the heated oxygen sensor (1).
  103. GM5395457

    Turbocharger Heat Shield Bolt (1) - Remove [2x]

  104. GM5395458

    Turbocharger Heat Shield Bolt (1) - Remove [2x]

  105. GM5395459

    Turbocharger Heat Shield (1) - Remove

  106. GM5399142

    Retainer Spring (1) - Release

  107. Charge Air Cooler Inlet Air Tube (2) @ Turbocharger (3) - Remove
  108. GM5494001

    Retainer (1) - Unclip

  109. GM5407967

    Water Pump Cover Bolt (1) - Remove [3x]

  110. Water Pump Cover (2) - Remove
  111. GM5491648

    Engine Mount Nut (1) - Remove

  112. Use the EN-51007  Engine Support Fixture to raise the engine off the engine mount.
  113. GM5491651

    Engine Mount Bracket Bolt (1) - Remove and DISCARD [4x]

  114. GM5495033

    Engine Mount Bracket (1) - Remove

  115. CAUTION:

    Phenolic spacer must be present to prevent galvanic/corrosive reaction and/or excessive temperature conduction between engine mount bracket and engine mount. Replace mount if phenolic spacer is missing or damaged. Failure to ensure phenolic spacer is intact and not damaged can lead to premature failure of engine mount and/or engine mount bracket.

  116. Ensure the phenolic spacer remains in place.
  117. Raise and support the vehicle. Lifting and Jacking the Vehicle
    GM5399124
  118. Disconnect and reposition electrical connectors as necessary.
  119. NOTE:

    The heated oxygen sensor MAY be difficult to remove when the engine temperature is less than 48°C (120°F).

    NOTE:

    The heated oxygen sensor in-line connector and louvered end MUST be kept clear of all grease, dirt, and other contaminants. Do NOT use cleaning solvents of any type. Do NOT drop or roughly handle the sensor.

  120. Using the appropriate tool, remove the heated oxygen sensor (1).
  121. GM5400756

    Floor Panel Number 4 Cross Bar Reinforcement Bolt (1) - Remove [6x]

  122. Floor Panel Reinforcement (2) - Remove
  123. GM5309188

    Catalytic Converter Nut (1) - Remove [2x]

  124. GM5394596

    Electrical Connector (1) @ Exhaust Control Valve Actuator - Disconnect [2x]

  125. GM5309202

    Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Left Side (2) - Separate

  126. Exhaust Muffler (1) @ Exhaust Rear Muffler Insulator-Left Side (3) - Separate
  127. GM5309211

    Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Right Side (2) - Separate

  128. Exhaust Muffler (1) @ Exhaust Rear Muffler Insulator-Right Side (3) - Separate
  129. GM5394598

    Exhaust Muffler (1) - Remove

  130. Catalytic Converter Gasket (2) - Remove and DISCARD
  131. GM5399464

    Front Crossmember Brace Nut (1) - Remove [4x]

  132. Front Crossmember Brace (2) - Remove
  133. GM5403738

    Exhaust Pipe Clamp (1) - Loosen

  134. GM5442538

    Catalytic Converter Brace Bracket Nut (1) - Remove [2x]

  135. Catalytic Converter Brace Bolt (2) - Remove [2x]
  136. Catalytic Converter Brace (3) - Remove
  137. GM5403768

    Warm Up Three-Way Catalytic Converter (1) - Remove

  138. Exhaust Pipe Clamp (2) - Remove and DISCARD
  139. Catalytic Converter Gasket (3) - Remove and DISCARD
  140. GM5395337

    Compressor Air Intake Turbocharger Wastegate Actuator Link Spring (1) - Remove

  141. Compressor Air Intake Turbocharger Wastegate Actuator Link Clip (2) - Remove
  142. Compressor Air Intake Turbocharger Wastegate Actuator Rod (3) @ Turbocharger Wastegate Actuator - Disconnect
  143. GM5395335

    Hose Clamp (1) - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  144. Turbocharger Coolant Feed and Return Pipe (2) @ Exhaust Manifold Outlet Pipe - Remove
  145. GM5395343

    Hose Clamp (1) - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  146. Turbocharger Coolant Feed Hose (2) @ Turbocharger Coolant Feed and Return Pipe - Remove
  147. GM5395358

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

  148. GM5395366

    Turbocharger Coolant Feed and Return Pipe (1) - Remove

  149. Turbocharger Coolant Feed and Return Pipe Gasket (2) - Remove and DISCARD
  150. GM5517316

    Retainer (1) - Disconnect [3x]

  151. Electrical Connector (2) - Disconnect [2x]
  152. Reposition the front axle vent hose (3), and electrical harness (4).
  153. GM5156836
    CAUTION:

    The Positive Crankcase Ventilation (PCV) line is tamper resistant and must always be replaced once it is removed. The fittings connected to the PCV line must also be replaced if they are damaged when the PCV line is removed. To reduce the risk of damage to the fittings, use a suitable cutting tool and carefully cut the connections away.

    NOTE:

    Disconnecting the tamper resistant connections will damage the positive crankcase ventilation tube, it must be replaced after removal.

    Use a suitable tool to disconnect the 6 locking tabs at each tamper resistant connection.

  154. Positive Crankcase Ventilation Tube (1) - Remove and DISCARD
  155. GM5146481

    Turbocharger Brace Nut (1) - Remove

  156. Turbocharger Bracket Bolt (2) - Remove [2x]
  157. Turbocharger Brace (3) - Remove
  158. Turbocharger Oil Feed Pipe Bolt (4) - Remove [4x]
  159. GM5146546

    Turbocharger Nut (1) - Remove and DISCARD [2x]

  160. Turbocharger Bolt (2) - Remove and DISCARD [2x]
  161. GM5146550

    Turbocharger Assembly (1) - Remove

  162. WARNING:

    When removing, handling or installing this component wear protective gloves. The sharp edges on the component may be very sharp and may cause injury.

  163. Turbocharger Gasket (2) - Remove and DISCARD
  164. GM5004022

    Turbocharger Oil Feed Pipe Bolt (1) @ Compressor Air Intake Turbocharger - Remove [2x]

  165. Turbocharger Oil Feed Pipe (2) - Remove
  166. Turbocharger Oil Return Pipe Gasket (3) - Remove and DISCARD
  167. Turbocharger Oil Feed Pipe Gasket (4) - Remove and DISCARD
  168. Turbocharger Oil Return Pipe Gasket (5) - Remove and DISCARD
  169. GM5918235

    Turbocharger Stud (1) - Remove and DISCARD [2x]

  170. GM5156329

    Use a suitable tool to rotate the drive belt tensioner (1) counterclockwise to relieve tension from the drive belt (2).

  171. Remove the drive belt (2) from the pulleys and tensioner (1).
  172. Slowly release tension on the drive belt tensioner (1).
  173. Clean and inspect the drive belt surfaces of all the pulleys.
  174. GM5500497

    Drive Belt Idler Pulley (2) - Remove

  175. GM5500583

    Drive Belt Tensioner Bolt (3) - Remove [2x]

  176. Drive Belt Tensioner (4) - Remove
  177. GM5003904

    Belt Idler Pulley (1) - Remove

  178. CAUTION:

    Phenolic spacer must be present to prevent galvanic/corrosive reaction and/or excessive temperature conduction between engine mount bracket and engine mount. Replace mount if phenolic spacer is missing or damaged. Failure to ensure phenolic spacer is intact and not damaged can lead to premature failure of engine mount and/or engine mount bracket.

  179. Ensure the phenolic spacer remains in place.
  180. Use the EN-51007  Engine Support Fixture to lower the right side of the engine onto the engine mount.
  181. GM5495033

    Engine Mount Bracket (1) - Install

  182. GM5491651

    Engine Mount Bracket Bolt (1) - Install and hand tighten [4x]

  183. Use the EN-51007  Engine Support Fixture to lower the engine onto the engine mount.
  184. Remove the engine support fixture. Engine Support Fixture
  185. GM5164169
    NOTE:

    The timing pin (3) is installed into the flexplate for engine timing procedures, it can be damaged if torque is applied to the flexplate with the timing pin engaged. The pin must be placed in the retracted position before torque is applied to the flexplate.

    Set the timing pin feature in the retracted position from the engaged position by pulling back and twisting the handle (1) 90 degrees.

  186. Install the EN-52476  Flywheel Lock and Alignment Tool (2) through the starter mounting hole.
  187. Install the slide (4) of the EN-52476  Flywheel Lock and Alignment Tool.
  188. GM5002064

    Camshaft Carrier Bolt (2) - Remove

  189. Camshaft Cover Core Hole Plug (1) - Remove [2x]
  190. GM5256287
    NOTE:

    The EN-52462-A  Camshaft Tool locking pins fit tightly into the camshafts. Rotate the engine in both directions in small increments using the crankshaft balancer bolt until the locking pins of the EN-52462-A  Camshaft Tool (1) drop into the slots in the camshafts. Momentarily retract the timing pin of the EN-52476  Flywheel Lock and Alignment Tool as necessary to seat the EN-52462-A  Camshaft Tool locking pins. Ensure the EN-52476  Flywheel Lock and Alignment Tool timing pin is re-engaged into the automatic transmission flex plate.

    EN-52462-A  Camshaft Tool (1) - Install

  191. Insert the EN-52462-A  Camshaft Tool bolt (2) into the camshaft carrier and tighten to secure the tool to the camshaft carrier.
  192. GM5003927

    Crankshaft Balancer Bolt (1) - Remove and DISCARD

  193. Crankshaft Balancer (2) - Remove
  194. GM5004060

    Engine Front Cover Bolt (1) - Remove [10x]

  195. Engine Front Cover (2) - Remove and DISCARD
  196. The engine block sealing surface must be cleaned with low VOC brake clean, allow it to sit on the surface for several minutes to loosen the RTV. Use a plastic putty knife or plastic scraper to remove the old RTV. Once the RTV is removed, spray a second application of low VOC brake cleaner to the sealing surface on the engine block, wipe off with a clean lint free cloth. Wipe the new cover with low VOC brake clean on the sealing surface / bead path, then wipe it off with a clean lint free cloth.
  197. Clean out the engine front cover locating pin bores with low VOC brake clean and then dry them out with shop air.
  198. GM5164169
    NOTE:

    The timing pin (3) is installed into the flexplate for engine timing procedures, it can be damaged if torque is applied to the flexplate with the timing pin engaged. The pin must be placed in the retracted position before torque is applied to the flexplate.

    Remove the slide (4) of the EN-52476  Flywheel Lock and Alignment Tool (2) and install the timing pin (3) by releasing the handle (1).

  199. GM5646821

    Camshaft Position Actuator Solenoid Valve Bolt (1) - Remove [2x]

  200. Camshaft Position Actuator Magnet (2) - Remove
  201. Camshaft Position Actuator Magnet Gasket (3) - Remove and DISCARD
  202. GM5646819

    Camshaft Position Actuator Solenoid Valve Bolt (1) - Remove [2x]

  203. Camshaft Position Actuator Magnet (2) - Remove
  204. Camshaft Position Actuator Magnet Gasket (3) - Remove and DISCARD
  205. GM5004054

    Timing Chain Upper Cover Bolt (1) - Remove [9x]

  206. Timing Chain Upper Cover Bolt (2) - Remove
  207. NOTE:

    Use pry points to remove the timing chain upper cover.

  208. Timing Chain Upper Cover (3) - Remove
  209. Timing Belt Front Upper Cover Seal (4) - Remove and DISCARD
  210. GM5256386

    Rotate both handles (4) of the EN-52462-A  Camshaft Tool towards the rear of the engine.

  211. NOTE:

    Ensure the camshaft carrier and cylinder head face are clean and free from RTV prior to installing the EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool.

  212. EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool (2) - Install [2x]
  213. Install and tighten the two EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool bolts (3) enough to secure the EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool (2) to the cylinder head.
  214. GM5257213

    EN-52461  Camshaft Actuator Holder (1) @ EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool (2) - Install

  215. Install and tighten the 2 EN-52461  Camshaft Actuator Holder bolts (3).
  216. GM5257293

    Engage the tangs of the EN-52461  Camshaft Actuator Holder (1) to the intake and the exhaust camshaft position actuator slots.

  217. Tighten the EN-52461  Camshaft Actuator Holder bolts (2) to lock the actuators in place.
  218. GM5257299

    Loosen the camshaft position actuator valve solenoid bolts (1).

  219. CAUTION:

    Hold the camshaft position actuator firmly and squarely during camshaft position actuator valve solenoid bolt removal/installation. Failure to do so may result in damage to the inside of the camshaft position actuator.

    NOTE:

    Pressure must be applied towards the engine on the EN-52461  Camshaft Actuator Holder at points (3) prior to and during any time the following two conditions are simultaneously met.

    • The camshaft position actuator valve solenoid bolt (1) is loosened or removed.
    • The EN-52461  Camshaft Actuator Holder bolts (2, 4) are loosened.
  220. Loosen the EN-52461  Camshaft Actuator Holder bolt (2) to un-lock the intake actuator.
  221. Loosen the EN-52461  Camshaft Actuator Holder bolt (4) to un-lock the exhaust actuator.
  222. GM5257323

    Remove timing chain tension from the camshaft position actuators and tighten the lower portion of the timing chain around the crankshaft sprocket.

    1. Use a wrench to turn the EN-52461  Camshaft Actuator Holder (1) counter-clockwise 6 N.m 53 lb in, then hold.
    2. NOTE:

      Ensure the EN-52461  Camshaft Actuator Holder bolt (2) is tightened enough that EN-52461  Camshaft Actuator Holder (1) is firmly clamped and will not slip.

    3. Tighten the EN-52461  Camshaft Actuator Holder bolt (1) to lock the intake actuator securely in place.
    4. Remove the wrench from EN-52461  Camshaft Actuator Holder (1).
    5. Use a wrench to turn the EN-52461  Camshaft Actuator Holder (4) clockwise 6 N.m 53 lb in, then hold.
    6. NOTE:

      Ensure the EN-52461  Camshaft Actuator Holder bolt (3) is tightened enough that EN-52461  Camshaft Actuator Holder (4) is firmly clamped and will not slip.

    7. Tighten the EN-52461  Camshaft Actuator Holder bolt (2) to lock the exhaust actuator securely in place.
    8. Remove the wrench from EN-52461  Camshaft Actuator Holder (4).
    9. GM5257323

      Relieve timing chain tension from the camshaft position actuators.

    10. NOTE:

      Pressure must be applied towards the engine on the EN-52461  Camshaft Actuator Holder at points (1, 4) prior to and during any time the following two conditions are simultaneously met.

      • The camshaft position actuator valve solenoid bolt is loosened or removed.
      • The EN-52461  Camshaft Actuator Holder bolts (2, 3) are loosened.
    11. Loosen the EN-52461  Camshaft Actuator Holder bolt (2) to release the intake actuator.
    12. Loosen the EN-52461  Camshaft Actuator Holder bolt (3) to release the exhaust actuator.
    13. GM5257330
      NOTE:

      Only remove the camshaft position actuator valve bolts that are defective, or as necessary to remove their corresponding actuators.

      Remove the camshaft position actuator valve solenoid bolts (1) and DISCARD.

    14. GM5299877
      NOTE:

      Hold the bottom of the actuator while disengaging the torque reaction tool to prevent the actuator from dropping.

      Slide the barrel (2) of the torque reaction tool away from the actuators.

    15. Remove the exhaust camshaft position actuator (3) and the intake camshaft position actuator (4).
  223. GM5004068

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

  224. NOTE:

    The timing chain tensioner plunger is spring loaded, hold the plunger in place as the tensioner is removed to prevent losing components of the timing chain tensioner.

  225. Timing Chain Tensioner (2) - Remove
  226. Timing Chain Tensioner Gasket (3) - Remove and DISCARD
  227. Timing Chain Guide Bolt (4) - Remove
  228. Timing Chain Guide (5) - Remove
  229. GM5004079

    Crankshaft Sprocket (3) - Remove

  230. Timing Chain Guide Bolt (1) - Remove [2x]
  231. Timing Chain Guide (2) - Remove
  232. Timing Chain (4) - Remove
  233. GM5257213

    Loosen the two bolts (3) of EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool.

  234. Remove EN-52461  Camshaft Actuator Holder (1).
  235. GM5256386

    Remove the two EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool bolts (3).

  236. EN-52461-200  Adapter 675T of Cam Phaser Torque Reaction Tool - Remove [2x]
  237. GM5004087

    Camshaft Cover Stud (1) - Remove

  238. Camshaft Cover Stud (2) - Remove [17x]
  239. Camshaft Cover Bolt (3) - Remove [4x]
  240. Camshaft Carrier (4) - Remove
  241. Camshaft Cover Gasket (5) - Remove and DISCARD
  242. GM5133779

    Electrical Connector (1) - Disconnect

  243. Fuel Injection Fuel Rail Bolt (2) - Remove [4x]
  244. Electrical Connector @ Knock Sensor - Disconnect [2x]
  245. GM5022863
    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.

    CAUTION:

    After removal, place the cylinder head on 2 wood blocks in order to prevent damage to the sealing surfaces.

    Cylinder Head Bolt (6) - Remove and DISCARD [2x]

  246. Cylinder Head Bolt (5) - Remove and DISCARD [3x]
  247. Cylinder Head Bolt (4) - Remove and DISCARD [3x]
  248. Cylinder Head Bolt (3) - Remove and DISCARD [10x]
  249. Cylinder Head (2) - Remove
  250. Cylinder Head Gasket (1) - Remove and DISCARD
  251. GM5133803
    NOTE:

    Use care to avoid contact with the fuel rail harness during special tool installation and fuel rail removal.

    Install the EN-49248  Injector Rail Assembly Remover.

  252. NOTE:
    • Turn BOTH handles simultaneously, in small, even increments
    • DO NOT twist the fuel injector fuel rail while removing.
  253. Turn both handles on the EN-49248  Injector Rail Assembly Remover to disengage the fuel injection fuel rail.
  254. Remove the EN-49248  Injector Rail Assembly Remover.
  255. Direct Fuel Injection Fuel Rail - Remove
  256. GM5026478

    Positive Crankcase Ventilation Oil Separator Bolt (1) - Remove [7x]

  257. Positive Crankcase Ventilation Oil Separator (2) - Remove
  258. Positive Crankcase Ventilation Oil Separator Gasket (3) - Remove and DISCARD
  259. GM5064709
    CAUTION:

    Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method.

    Fuel Injector Retainer (1) - Remove and DISCARD [4x]

  260. Direct Fuel Injector (2) - Remove [4x]
  261. GM5064712
    CAUTION:

    Do not use a metal tool to remove O-rings, spacers or injector seals. Care must be taken not to scratch or damage the tubes of the injector.

    Fuel Injector Bushing (4) - Remove and DISCARD [4x]

  262. Fuel Injector Seal (1) - Remove and DISCARD [4x]
  263. Fuel Injector Seal Spacer (2) - Remove and DISCARD [4x]
  264. Fuel Injector Nozzle Housing Seal (3) - Remove and DISCARD [8x]