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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> ENGINE MECHANICAL - 4.8L, 5.3L, AND 6.0L (2 Of 4) >> On-Vehicle Repair Instructions >> Timing Chain and Sprockets Replacement >> Installation Procedure

Installation Procedure

    Fig 1: View Of Crankshaft Key & Keyway
    GM156149Courtesy of GENERAL MOTORS CORP.
  1. Install the key into the crankshaft keyway, if previously removed.
  2. Fig 2: Identifying Crankshaft Sprocket Key Installation Position
    GM490871Courtesy of GENERAL MOTORS CORP.
  3. Tap the key (1) into the keyway until both ends of the key bottom onto the crankshaft.
  4. Fig 3: View Of Crankshaft Sprocket
    GM156150Courtesy of GENERAL MOTORS CORP.
  5. Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
  6. Use the J 41665  in order to install the crankshaft sprocket. See Special Tools .
    Fig 4: Using J 41665 To Install Crankshaft Sprocket
    GM63199Courtesy of GENERAL MOTORS CORP.

    Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

  7. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
  8. IMPORTANT:
    • Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole.
    • The sprocket teeth and timing chain must mesh.
    • The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

      Locate the camshaft sprocket alignment mark in the 6 o'clock position.

    Fig 5: Camshaft Sprocket, Bolt & Timing Chain
    GM63263Courtesy of GENERAL MOTORS CORP.
  9. Install the camshaft sprocket and timing chain.
  10. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
    Fig 6: View Of Camshaft & Crankshaft Sprockets Timing Marks Aligned
    GM156158Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  11. Install the camshaft sprocket bolts.

    Tighten:  Tighten the bolts to 35 N.m (26 lb ft).

  12. Install the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil Deflector Replacement .