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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1678 (Engine Mechanical - 6.6L (LMM) - Repair Instructions - On Vehicle) >> Camshaft Replacement >> Removal Procedure

Removal Procedure

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    Fig 1: Locking Flywheel Using J 44643
    GM660308Courtesy of GENERAL MOTORS CORP.
  1. Remove the engine assembly. Refer to Engine Replacement .
  2. Remove the valve lifters. Refer to Valve Lifter Replacement .
  3. Install J-44643:  tool flush to the flywheel opening.
  4. Remove the engine front cover. Refer to Engine Front Cover Replacement .
    5. Fig 2: View Of Oil Pump Driven Gear & Nut
    GM738905Courtesy of GENERAL MOTORS CORP.
  5. Remove the oil pump driven gear nut.
  6. Remove the oil pump driven gear.
    7. Fig 3: View Of Oil Pump Drive Gear
    GM738904Courtesy of GENERAL MOTORS CORP.
    NOTE: 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.
  7. Remove the oil pump drive gear and crankshaft reluctor.
    • Do not remove the crankshaft reluctor bolts.
    • Do not damage the reluctor teeth.
    8. Fig 4: Measuring Camshaft End Play Using J 26900-12 & J 26900-13
    GM738903Courtesy of GENERAL MOTORS CORP.
  8. Using J-26900-12:  indicator (1) and J-26900-13:  base (2), measure the camshaft end play.
    • 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.
    9. Fig 5: View Of Camshaft Reluctor & Bolts
    GM739316Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshaft reluctor screws.
  10. Remove the camshaft reluctor.
    11. WARNING: The two piece cam gear must be bolted together to prevent the spring tension from unloading upon removal. Additionally, the two piece cam gear must remain bolted together until it is re-installed to the camshaft and fully engaged to the crankshaft gear. Failure to do so may result in personal injury.
  11. Remove the camshaft exciter ring.
    12. Fig 6: Using Exciter Ring Bolt To Secure Spring Tension
    GM1650679Courtesy of GENERAL MOTORS CORP.
  12. Align the threaded hole with a suitable tool and install an exciter ring bolt to secure the spring tension.
  13. Remove the camshaft thrust plate bolts through the holes in the camshaft gear.
    14. Fig 7: View Of Camshaft Thrust Plate Bolts
    GM738902Courtesy of GENERAL MOTORS CORP.
  14. In order to loosen the camshaft gear bolt use J-44643:  tool in order to hold the engine from turning.
  15. Loosen the camshaft gear bolt and leave the bolt finger tight.
  16. Remove the camshaft thrust plate bolts through the holes in the camshaft gear.
    17. Fig 8: View Of Camshaft & Camshaft Gear
    GM738901Courtesy of GENERAL MOTORS CORP.
  17. Remove the camshaft with the camshaft gear attached.
    18. Fig 9: View Of Camshaft, Camshaft Gear & Camshaft Thrust Plate
    GM660540Courtesy of GENERAL MOTORS CORP.
  18. Remove the camshaft gear bolt and discard.
  19. Remove the camshaft gear.
  20. Remove the camshaft thrust plate.
  21. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and Inspection .
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