GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

J 22888-20A Crankshaft Sprocket Remover.


    Object Number: 4900  Size: SH
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement
  2. Rotate the crankshaft until the number 1 piston is at Top Dead Center (TDC) of the compression stroke.

  3. Object Number: 4899  Size: SH

    Important: Make sure the dot on the timing chain sprockets line up.

  4. Remove the timing chain tensioner bolts.

  5. Object Number: 1152  Size: SH
  6. Remove the timing chain, tensioner and camshaft sprocket at the same time.
  7. Remove the crankshaft sprocket. Refer to J 5590 .

Installation Procedure

Tools Required

J 5590 Crankshaft Gear Installer.


    Object Number: 4897  Size: SH
  1. Install the crankshaft sprocket using J 5590 .
  2. Important: Make sure that the crankshaft sprocket is seated against the crankshaft.

  3. Install the timing chain and install the timing chain tensioner.

  4. Object Number: 30191  Size: SH
  5. Compress the timing chain tensioner spring.
  6. Insert a cotter pin or a nail into the hole in the tensioner to retain the timing chain tensioner shoe.

  7. Object Number: 4900  Size: SH
  8. Install the timing chain tensioner. Do not tighten the timing chain tensioner bolts.

  9. Object Number: 4899  Size: SH
  10. Align the crankshaft timing marks with the tab on the timing chain tensioner.
  11. Align the camshaft timing mark with the tab on the timing chain tensioner.
  12. Install the camshaft sprocket and install the timing chain.
  13. Tighten

    1. Tighten the timing chain tensioner bolts to 24 N·m (18 lb ft).
    2. Tighten the camshaft sprocket bolt to 130 N·m (96 lb ft).

    Refer to

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    in General Information.


    Object Number: 30191  Size: SH
  14. Remove the cotter pin or nail from the hole in the timing chain tensioner.
  15. Install the engine front cover and a new gasket. Refer to Engine Front Cover Replacement .