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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) >> Timing Chain and Sprockets Replacement (LY6/L76/L92) >> Removal Procedure

Removal Procedure

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    Fig 1: View Of Special Tool & Bolts
    GM1658136Courtesy of GENERAL MOTORS CORP.
  1. Remove the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil Deflector Replacement (RPOs LC9/LMG/LY2/LY5) or Oil Pump, Screen and Crankshaft Oil Deflector Replacement (RPOs LY6/L76/L92) .
  2. Remove the starter motor. Refer to Starter Motor Replacement .
    3. 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 .
  3. 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).

    4. Fig 2: View Of CMP Actuator Alignment Mark & Crankshaft Sprocket Alignment Mark
    GM1670623Courtesy of GENERAL MOTORS CORP.
  4. Rotate the crankshaft sprocket until the camshaft position (CMP) actuator alignment mark (1) and the crankshaft sprocket alignment mark (2) are aligned.
    5. Fig 3: View Of CMP Actuator Solenoid Valve
    GM1670622Courtesy of GENERAL MOTORS CORP.
  5. Remove and discard the CMP actuator solenoid valve (234).
    6. 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.
  6. Remove the CMP actuator (235) and timing chain (208).
    7. Fig 5: View Of Proper CMP Actuator Removal
    GM1714936Courtesy of GENERAL MOTORS CORP.
    CAUTION: Do not push or pull on the reluctor wheel of the camshaft position (CMP) actuator during removal or installation. The reluctor wheel is retained to the front of the CMP actuator by 3 roll pins. Pushing or pulling on the wheel may dislodge the wheel from the front of the actuator. The actuator return spring is under tension and may rotate the dislodged reluctor wheel, causing personal injury.
  7. Loosen and separate the CMP actuator and timing chain from the camshaft. Position your fingers behind the actuator sprocket and pull the actuator away from the front of the camshaft. Never pull on the reluctor wheel when attempting to remove the actuator.
    8. Fig 6: View Of Tie Strap Through Center Of Actuator
    GM1714946Courtesy of GENERAL MOTORS CORP.
  8. Insert and secure a tie strap (1) through the center of the actuator and over the reluctor wheel.
    9. Fig 7: View Of Timing Chain Tensioner & Bolts
    GM1658178Courtesy of GENERAL MOTORS CORP.
  9. Remove the timing chain tension bolts (231) and tensioner (232).
    10. Fig 8: View Of Crankshaft Sprocket Special Tools
    GM1658180Courtesy of GENERAL MOTORS CORP.
  10. Using the J 41816-2  (1), the J 41558  (2), bolts (3) and the J 8433  (4) in order to remove the crankshaft sprocket. See Special Tools .
    11. Fig 9: View Of Crankshaft Sprocket
    GM1658182Courtesy of GENERAL MOTORS CORP.
  11. Remove the crankshaft sprocket (207).
    12. Fig 10: View Of Crankshaft Key & Keyway
    GM156149Courtesy of GENERAL MOTORS CORP.
  12. Remove the crankshaft sprocket key, if required.
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