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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 2.4L) >> Repair Instructions - On Vehicle >> Cylinder Head Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (GE 47716) .
    2. Fig 1: Radiator Inlet Hose Clamp
    GM2680016Courtesy of GENERAL MOTORS COMPANY
  2. Reposition the radiator inlet hose clamp (1) .
  3. Remove the radiator inlet hose from the cylinder head (2).
  4. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement (LUK, LEA) .
  5. Remove the intake manifold. Refer to Intake Manifold Replacement (LEA) .
  6. Remove the fuel pump. Refer to Fuel Pump Replacement .
  7. Remove the radiator surge tank air bleed hose from the cylinder head.
  8. Disconnect all electrical connectors as necessary.
  9. Remove the camshaft cover. Refer to Camshaft Cover Replacement (LUK)  or Camshaft Cover Replacement (LEA) .
  10. Remove the purge solenoid and bracket. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
    11. Fig 2: Upper Timing Chain Guide Bolts And Guide
    GM2633015Courtesy of GENERAL MOTORS COMPANY
  11. Remove the upper timing chain guide bolts (1) and guide (2).
    12. Fig 3: Loosening/Tightening Camshaft Actuator Retainer Bolts
    GM2066456Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • If the intake camshaft actuator is moving independently of the camshaft, this means the camshaft is not locked to the actuator. Rotate the camshaft counterclockwise while the holding tool is installed and this will lock the camshaft to the actuator.
    • Ensure the timing chain and the camshaft position actuators are marked for proper assembly.
  12. Rotate the intake camshaft clockwise and install the EN-48953  locking tool (1) to the actuators.
    13. CAUTION:

    Refer to Fastener Caution .

  13. Install the camshaft actuator retainer bolts and tighten to 10 N.m (89 lb in).
  14. Clean the timing chain and gears with solvent.
  15. Mark the timing gear sprockets and the timing chain. It is recommended that the paint marks are located in the 12 o'clock position.
  16. Use a 24 mm wrench on the hex flats of the camshaft to prevent camshaft rotation.
  17. Loosen, but do not remove the intake and exhaust camshaft actuator bolts.
  18. Remove the EN-48953  locking tool.
    19. Fig 4: Timing Chain Tensioner
    GM2660839Courtesy of GENERAL MOTORS COMPANY
  19. Remove the timing chain tensioner (1).
    20. Fig 5: View Of Timing Chain & Chain Retention Tool
    GM2066475Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure the tips of the EN-48749  retention tool are fully engaged into the timing chain. The retention tool rod can be used on the back side of the chain to ensure the teeth from the retention tool are engaged.

  20. Install the EN-48749  retention tool (1) to the intake side of the timing chain.
    21. Fig 6: View Of Timing Chain Retention Tool
    GM2066482Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The camshaft actuators should not rotate during the removal of installation.

  21. Install the EN-48749  retention tool (1) to the exhaust side of the timing chain.
    22. Fig 7: Exhaust Camshaft Actuator Bolt
    GM2633017Courtesy of GENERAL MOTORS COMPANY
  22. Remove and discard the exhaust camshaft actuator bolt (2).
  23. Remove the exhaust camshaft actuator (3) from the camshaft while also removing the actuator from the timing chain.
    24. Fig 8: Intake Camshaft Actuator Bolt
    GM2633020Courtesy of GENERAL MOTORS COMPANY
  24. Remove and discard the intake camshaft actuator bolt (1).
  25. Remove the intake camshaft actuator (2) from the camshaft while also removing the actuator from the timing chain.
    26. Fig 9: Aligning Marks On Cylinder Head In Relationship To Camshaft Actuator Notches
    GM2066509Courtesy of GENERAL MOTORS COMPANY
  26. Mark the cylinder head (1) in relationship to the camshaft actuator notch is on the camshaft (2).
    27. Fig 10: Fixed Timing Chain Guide Access Plug
    GM2633023Courtesy of GENERAL MOTORS COMPANY
  27. Remove the fixed timing chain guide access plug (1).
  28. Remove the fixed guide upper bolt.
    29. Fig 11: View Of Rubber Band To Pull Guides Together
    GM2066512Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The threaded rod from the timing chain retention tool can be used to help feed the rubber band around the chain guides.

  29. Install a rubber band (1) around the top of the upper timing chain guides (2) in order to pull the guides together.
    30. Fig 12: Cylinder Head Bolt Removal Sequence
    GM1825047Courtesy of GENERAL MOTORS COMPANY
  30. Remove the cylinder head bolts in the sequence shown. Discard the bolts.
    31. Fig 13: Cylinder Head
    GM2660945Courtesy of GENERAL MOTORS COMPANY
  31. Remove the cylinder head (1).
  32. Remove the cylinder head gasket (2).
  33. Clean all of the gasket surfaces.
  34. Use the following steps when cleaning the cylinder head and cylinder block surfaces:
    • Use a razor blade gasket scraper to clean the cylinder head and cylinder block gasket surfaces. Do not scratch or gouge either surface.
      • NOTE:

      DO NOT use any other method or technique to clean these gasket surfaces.

    • Use a NEW razor blade on the cylinder head and a NEW blade on the cylinder block.
      • NOTE:

      Be careful not to gouge or scratch the gasket surfaces. DO NOT gouge or scrape the combustion chamber surfaces. The feel of the gasket surface is important, not the appearance. There will be indentations from the gasket left in the cylinder head after all of the gasket material is removed. These small indentations will be filled in by the NEW gasket.

    • Hold the razor blade as parallel to the gasket surface as possible.
  35. Clean the old sealer/lube and any dirt from around the bolt holes.
    36. NOTE:

    DO NOT use a tap to clean the cylinder head bolt holes.

  36. Clean the bolts holes with a nylon bristle brush.
  37. When cleaning the cylinder head bolt holes use suitable commercial spray liquid solvent and compressed air from an extended-tip blow gun in order to reach the bottom of the holes.
  38. If replacing the cylinder head, transfer all parts as necessary.
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