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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Engine Mechanical - 4.8L, 5.3L, 6.0L Or 6.2L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Timing Chain and Sprocket Installation >> Procedure

Timing Chain and Sprocket Installation: Procedure

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    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: View Of Installed Crankshaft Key
    GM1272887Courtesy of GENERAL MOTORS CORP.
  2. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.
    3. Fig 3: View Of Crankshaft Sprocket
    GM1658182Courtesy of GENERAL MOTORS CORP.
  3. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
    4. Fig 4: View Of Crankshaft Sprocket & Installer
    GM1658237Courtesy of GENERAL MOTORS CORP.
  4. Use the J 41478  (1) and the J 41665  (2) in order to install the crankshaft sprocket. See Special Tools .

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

  5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
    6. Fig 5: View Of Compressed Tensioner
    GM1658249Courtesy of GENERAL MOTORS CORP.
  6. Compress the timing chain tensioner guide and install the EN 46330  . See Special Tools .
    7. Fig 6: View Of Timing Chain Tensioner
    GM1658251Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  7. Install the timing chain tensioner (232) and bolts (231).

    Tighten:  Tighten the timing chain tensioner bolts to 25 N.m (18 lb ft).

    8. Fig 7: View Of Camshaft Sprocket, Timing Chain & Bolt
    GM1759805Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Do not use the camshaft sprocket bolt again. Install a NEW bolt during assembly.
    • The sprocket teeth and timing chain must mesh.
    • The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.
  8. Install the camshaft sprocket (205), timing chain (208), and NEW bolt (206).
    9. Fig 8: Identifying Camshaft & Crankshaft Marks
    GM1658268Courtesy of GENERAL MOTORS CORP.
  9. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket (1) should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2) should be located in the 12 o'clock position.
    10. Fig 9: Locating Tensioner Pin
    GM1658271Courtesy of GENERAL MOTORS CORP.
  10. Remove the EN 46330  . See Special Tools .
    11. IMPORTANT: Do not apply threadlock to the flex plate bolts at this time.
  11. Temporarily install the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Installation .
    12. Fig 10: View Of Special Tool & Bolts
    GM1658136Courtesy of GENERAL MOTORS CORP.
  12. Install the J 42386-A  (1) and bolts. See Special Tools . Use 1 M10-1.5 x 120 mm bolt and 1 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).

    13. Fig 11: Tightening Camshaft Sprocket Bolt
    GM1658274Courtesy of GENERAL MOTORS CORP.
  13. Tighten the camshaft sprocket bolt.

    Tighten: 

    1. Tighten the camshaft sprocket bolt a first pass to 75 N.m (55 lb ft).
    2. Tighten the camshaft sprocket bolt a final pass an additional 50 degrees using the J 45059  . See Special Tools .

  14. Remove the J 42386-A  and bolts. See Special Tools .
  15. Remove the automatic transmission flex plate and bolt. Refer to Automatic Transmission Flex Plate Removal .
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