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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 160 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (3 Of 5)) >> On-Vehicle Repair Instructions (2 Of 2) >> Camshaft Replacement (RPOs LY6/L76/L92) >> Removal Procedure

Removal Procedure

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IMPORTANT: If camshaft replacement is required, the valve lifters must also be replaced.
    Fig 1: View Of Special Tool & Bolts
    GM1658136Courtesy of GENERAL MOTORS CORP.
  1. Remove the radiator support. Refer to Radiator Support Replacement .
  2. Remove the valve lifters. Refer to Valve Lifter Replacement (RPOs LC9/LMG/LY5/L76/L92) or Valve Lifter Replacement (RPOs LY2/LY6) .
  3. Remove the engine front cover. Refer to Engine Front Cover Replacement (RPOs LC9/LMG/LY2/LY5) or Engine Front Cover Replacement (RPOs LY6/L76/L92) .
  4. Remove the starter motor. Refer to Starter Motor Replacement .
    5. NOTE: Refer to Fastener Notice .
    IMPORTANT: Ensure that the teeth of the J 42386-A  mesh with the teeth of the engine flywheel. See Special Tools .
  5. Install the J 42386-A  (1) and bolts. See Special Tools . Use one M10-1.5 x 120 mm and one M10-1.5 x 45 mm bolt for proper tool operation.

    Tighten:  Tighten the J 42386-A  bolts to 50 N. See Special Tools .m (37 lb ft).

    6. Fig 2: View Of CMP Actuator Alignment Mark & Crankshaft Sprocket Alignment Mark
    GM1670623Courtesy of GENERAL MOTORS CORP.
  6. Rotate the crankshaft sprocket until the camshaft position (CMP) actuator alignment mark (1) and the crankshaft sprocket alignment mark (2) are aligned.
    7. Fig 3: View Of CMP Actuator Solenoid Valve
    GM1670622Courtesy of GENERAL MOTORS CORP.
  7. Remove and discard the CMP actuator solenoid valve (234).
    8. Fig 4: View Of CMP Actuator & Timing Chain
    GM1658255Courtesy of GENERAL MOTORS CORP.
    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.
  8. Remove the CMP actuator (235) and timing chain (208).
    9. Fig 5: Camshaft Retainer & Bolts
    GM1552492Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshaft retainer bolts (204) and retainer (203).
    10. Fig 6: View Of Camshaft
    GM1704626Courtesy of GENERAL MOTORS CORP.
    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.
  10. Install the camshaft sprocket bolt into the camshaft front bolt hole.
  11. Using the bolt as a handle, carefully rotate and remove the camshaft from the engine block.
  12. Remove the bolt from the camshaft.
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