GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 41478 Crankshaft Front Oil Seal Installer
    • J 41665 Crankshaft Balancer and Sprocket Installer

    Object Number: 156149  Size: SH
  1. Install the key into the crankshaft keyway, if previously removed.

  2. Object Number: 1272887  Size: SH
  3. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.

  4. Object Number: 156150  Size: SH
  5. Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.

  6. Object Number: 63199  Size: SH
  7. Use the J 41478 and the J 41665 in order to install the crankshaft sprocket.
  8. Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

  9. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.

  10. Object Number: 63263  Size: SH

    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.

  11. Install the camshaft sprocket and timing chain.

  12. Object Number: 156158  Size: SH
  13. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
  14. Notice: Refer to Fastener Notice in the Preface section.

  15. Install the camshaft sprocket bolts.
  16. Tighten
    Tighten the camshaft sprocket bolts to 35 N·m (26 lb ft).