GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Avalanche - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Timing Chain and Sprocket Removal

Tools Required

    • J 8433 Two Jaw Puller
    • J 41558 Crankshaft Sprocket Remover
    • J 41816-2 Crankshaft End Protector
    • J 42386-A Flywheel Holding Tool

    Object Number: 1658140 Size: SH

    Important: Do not apply threadlock to the flex plate bolts at this time.

  1. Temporarily install the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Installation .

    2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1658136 Size: SH
  2. Install the J 42386-A  (1) and bolts. Use 1 M10 - 1.5 x 120 mm and 1 M10 - 1.5 x 45 mm bolt for proper tool operation.

    3. Tighten
    Tighten the J 42386-A bolts to 50 N·m (37 lb ft).


    Object Number: 1759750 Size: SH

    Notice: 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.

  3. Remove and discard the camshaft sprocket bolt (206).
  4. Remove the camshaft sprocket (205) and timing chain (208).

    5. Object Number: 1658178 Size: SH
  5. Remove the bolts (231) and timing chain tensioner (232).

    6. Object Number: 1658180 Size: SH
  6. Use the J 41816-2  (1), the J 41558  (2), bolts (3), and the J 8433  (4) in order to remove the crankshaft sprocket.

    7. Object Number: 1658182 Size: SH
  7. Remove the crankshaft sprocket (207).

    8. Object Number: 156149 Size: SH
  8. Remove the crankshaft sprocket key, as required.
  9. Remove the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Removal .
  10. Remove the J 42386-A and bolts.