GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2009 🢒 H2 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Camshaft Replacement

Removal Procedure

    Object Number: 260128 Size: SH
  1. Remove the hood. Refer to Hood Replacement.
  2. Remove the radiator support. Refer to Radiator Support Replacement.
  3. Remove the valve lifters from both cylinder heads. Refer to Valve Lifter Replacement.
  4. Remove the camshaft sensor bolt and sensor.
  5. Remove the engine front cover. Refer to Engine Front Cover Removal.
  6. Rotate the engine until the timing marks are aligned.

    7. Caution: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

  7. Remove the camshaft sprocket bolts.
  8. Remove the camshaft sprocket and reposition the timing chain.

    9. Object Number: 63211 Size: SH
  9. Remove the camshaft retainer bolts and retainer.

    10. Caution: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.


    Object Number: 63212 Size: SH
  10. Remove the camshaft.
    11. 10.1. Install three M8 - 1.25 x 100 mm (M8 - 1.25 x 4.0 in) bolts to the bolt holes in the front of the camshaft.
    10.2. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block.
    10.3. Remove the three bolts from the camshaft.
  11. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and Inspection.

Installation Procedure

    Object Number: 63212 Size: SH

    Caution: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

    Note: If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil.
  2. Install three M8 - 1.25 x 100 mm (M8 - 1.25 x 4.0 in) bolts to the bolt holes in the front of the camshaft.
  3. Using the bolts as a handle, carefully install the camshaft into the engine block.
  4. Remove the three bolts from the front of the camshaft.

    5. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 63211 Size: SH

    Note: The gasket surface on the engine block should be clean and free of dirt and/or debris.

  5. Install the camshaft retainer and bolts and tighten to 25 N·m (18 lb ft).

    6. Object Number: 260128 Size: SH
  6. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused.
  7. Lubricate the O-ring seal with clean engine oil.
  8. Install the camshaft sensor and bolt and tighten to 25 N·m (18 lb ft).
  9. Install the camshaft sprocket and timing chain. Refer to Camshaft Timing Chain and Sprocket Replacement.
  10. Install the engine front cover. Refer to Engine Front Cover Removal.
  11. Install the valve lifters. Refer to Valve Lifter Replacement.
  12. Install the radiator support. Refer to Radiator Support Replacement.
  13. Install the hood. Refer to Hood Replacement.
  14. Lower the hood to the normal position.