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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical >> Repair Instructions >> On-Vehicle Repair Instructions >> Camshaft Replacement >> Removal Procedure

Removal Procedure

    Fig 1: View Of Camshaft Sensor & Bolt
    GM260128Courtesy of GENERAL MOTORS CORP.
  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. NOTE: 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. Fig 2: View Of Camshaft Retainer & Bolts
    GM63211Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshaft retainer bolts and retainer.
    10. NOTE: 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.
    Fig 3: View Of Bolts installed In Camshaft Front Bolt Holes
    GM63212Courtesy of GENERAL MOTORS CORP.
  10. Remove the camshaft.
    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.
    2. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block.
    3. Remove the three bolts from the camshaft.
  11. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and Inspection .
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