GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 7872 Dial Indicator Set

For equivalent regional tools, refer to Special Tools.


    Object Number: 660540  Size: SH
  1. Install the camshaft thrust plate to the camshaft.
  2. Install the camshaft driven gear.
  3. Install a new camshaft driven gear bolt.
  4. Leave the bolt finger tight.


    Object Number: 663813  Size: SH
  5. Install the camshaft and gear assembly into the cylinder block, aligning the camshaft gear to the crankshaft gear as shown.
  6. Caution: Refer to Fastener Caution in the Preface section.

  7. Install the camshaft thrust plate bolts and tighten to 22 N·m (16 lb ft).

  8. Object Number: 1650679  Size: SH

    Note: Use a suitable tool to relieve the spring tension while removing the locking bolt.

  9. Remove the exciter ring bolt that was installed to hold the spring tension of the two piece cam gear.

  10. Object Number: 663091  Size: SH
  11. Install the camshaft position sensor exciter ring to the camshaft gear.
  12. Install the camshaft position sensor exciter ring bolts and tighten to 9 N·m (80 lb in).

  13. Object Number: 660539  Size: SH
  14. Block the crankshaft from turning using a wooden handle.
  15. Install the new camshaft gear bolt and tighten to 234 N·m (173 lb ft).

  16. Object Number: 663816  Size: SH
  17. Measure the camshaft end play with J 7872 Dial Indicator Set .
  18. • The production value is 0.050-0.114 mm (0.0020-0.0045 in) and service limit is 0.2 mm (0.0079 in).
    • Replace the camshaft gear or the camshaft thrust plate if measured value exceeds the service limit.