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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Mechanical - 2.4L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove the intake manifold. Refer to Intake Manifold Replacement .
  2. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement (RPO LE5) .
  3. Remove the timing chain. Refer to Timing Chain, Sprockets, and/or Tensioner Replacement .
  4. Drain the cooling system. Refer to Draining and Filling Cooling System (2.2L (L61), 2.4L (LE5)) or Draining and Filling Cooling System (GE 47716 Fill) .
    5. Fig 1: Cylinder Head Bolt Removal Sequence
    GM465863Courtesy of GENERAL MOTORS CORP.
  5. Remove the cylinder head bolts in the sequence shown. Discard the bolts.
    6. Fig 2: View Of Cylinder Head And Gasket
    GM412427Courtesy of GENERAL MOTORS CORP.
  6. Remove the cylinder head.
  7. Remove the cylinder head gasket.
  8. Clean all of the gasket surfaces.
  9. 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.
      • IMPORTANT: 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.
      • IMPORTANT: 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.
  10. Clean the old sealer/lube and any dirt from around the bolt holes.
    11. IMPORTANT: DO NOT use a tap to clean the cylinder head bolt holes.
  11. Clean the bolts holes with a nylon bristle brush.
  12. 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.
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