GM Service Manual Online
For 1990-2009 cars only

    Object Number: 233793  Size: SH
  1. Remove the front engine lift bracket bolts.
  2. Remove the front engine lift bracket.

  3. Object Number: 235239  Size: SH
  4. Remove the camshaft position sensor bolt.
  5. Remove the camshaft position sensor.
  6. Remove and discard the camshaft position sensor O-ring.

  7. Object Number: 233789  Size: SH
  8. Remove the four chain guide access plugs located in the cylinder heads. Note the O-ring seal on each access plug.

  9. Object Number: 235192  Size: SH
  10. Loosen both primary camshaft drive chain tensioner bolts.
  11. Remove the lower primary camshaft drive chain tensioner bolt allowing the primary camshaft drive chain tensioner to swing downward and expand. This will release tension on the primary camshaft drive chain.
  12. Remove the upper primary camshaft drive chain tensioner bolt.
  13. Remove the primary camshaft drive chain tensioner (1).

  14. Object Number: 235189  Size: SH
  15. Remove the primary camshaft drive chain tensioner shoe bolt.
  16. Remove the primary camshaft drive chain tensioner shoe (1) by pushing the guide downward slightly and then pulling it up through the cylinder head.
  17. Remove the primary camshaft drive chain from the RH camshaft sprocket and allow the chain to fall into the oil pump area of the cylinder block.

  18. Object Number: 235173  Size: SH
  19. Remove the primary camshaft drive chain.

  20. Object Number: 263906  Size: SH
  21. Loosen the primary camshaft drive chain tensioner oil tube bolts.
  22. Remove the primary camshaft drive chain tensioner oil tube (1).