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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 6.6L - On Vehicle Repair Instructions) >> On-Vehicle Repair Instructions >> Camshaft Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove the valve lifters. Refer to Valve Lifter Replacement .
  2. Remove the charged air cooler. Refer to Charged Air Cooler Replacement .
  3. Remove the air conditioning (A/C) condenser. Refer to Condenser Replacement in Heating, Ventilation, and Air Conditioning.
  4. Remove the starter. Refer to Starter Motor Replacement (6.6L (LLY) Engine) .
  5. Install J 44643  flush to the flywheel opening. See Special Tools .
    Fig 1: Locking Flywheel Using J 44643
    GM660308Courtesy of GENERAL MOTORS CORP.
  6. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  7. Remove the oil pump driven gear nut.
    Fig 2: View Of Oil Pump Driven Gear & Nut
    GM738905Courtesy of GENERAL MOTORS CORP.
  8. Remove the oil pump driven gear.
    9. IMPORTANT: The crankshaft reluctor and the oil pump drive gear are timed together at the factory. Do not remove the crankshaft reluctor from the oil pump drive gear.
  9. Remove the oil pump drive gear and crankshaft reluctor.
    • Do not remove the crankshaft reluctor bolts.
    • Do not damage the reluctor teeth.
      • Fig 3: View Of Oil Pump Drive Gear
      GM738904Courtesy of GENERAL MOTORS CORP.
  10. Using J 26900-12  (1) and J 26900-13  (2), measure the camshaft end play. See Special Tools .
    Fig 4: Measuring Camshaft End Play Using J 26900-12 & J 26900-13
    GM738903Courtesy of GENERAL MOTORS CORP.
    • The production value is 0.050-0.114 mm (0.002-0.0045 in) and service limit is 0.20 mm (0.008 in).
    • Replace the camshaft gear or the camshaft thrust plate if measured value exceeds service limit.
  11. Remove the camshaft reluctor screws.
  12. Remove the camshaft reluctor.
    Fig 5: View Of Camshaft Reluctor & Bolts
    GM739316Courtesy of GENERAL MOTORS CORP.
  13. In order to loosen the camshaft gear bolt use J 44643  in order to hold the engine from turning. See Special Tools .
  14. Loosen the camshaft gear bolt and leave the bolt finger tight.
  15. Remove the camshaft thrust plate bolts through the holes in the camshaft gear.
    Fig 6: View Of Camshaft Thrust Plate Bolts
    GM738902Courtesy of GENERAL MOTORS CORP.
  16. Remove the camshaft with the camshaft gear attached.
    Fig 7: View Of Camshaft & Camshaft Gear
    GM738901Courtesy of GENERAL MOTORS CORP.
  17. Remove the camshaft gear bolt and discard.
    Fig 8: View Of Camshaft, Camshaft Gear & Camshaft Thrust Plate
    GM660540Courtesy of GENERAL MOTORS CORP.
  18. Remove the camshaft gear.
  19. Remove the camshaft thrust plate.
  20. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and Inspection .

    If the camshaft bearings are worn or damaged the engine will require removal in order to replace the camshaft bearings. Refer to Engine Replacement .

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