GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Aurora 🢒 Engine 🢒 Engine Mechanical - 4.0L 🢒 Secondary Camshaft Drive Chain Replacement

Removal Procedure
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  2. Remove the camshaft covers. Refer to Camshaft Cover Replacement .
  3. Loosen both of the drive chain tensioner bolts.
  4. Remove the tensioner bolts and the tensioner. Allow the tensioner to expand as you remove the tensioner.

    5. Object Number: 53648 Size: SH
  5. Remove the chain guide access plugs located in the cylinder heads. Note the O-ring seal on each access plug.
  6. Remove the camshaft position sensor.

    7. Object Number: 53005 Size: SH
  7. Remove the secondary chain guide retaining bolts.
  8. Remove the secondary chain guides.

    9. Object Number: 53645 Size: SH
  9. Remove the camshaft sprocket retaining bolts.

    10. Object Number: 53644 Size: SH
  10. Slide the camshaft sprockets off of the camshafts.
  11. Remove the camshaft sprockets and the secondary drive chain together. Leave the intermediate sprocket in place.

Installation Procedure
  1. Retime the camshafts. Refer to Setting Camshaft Timing .
  2. Install the engine front cover. Refer to Engine Front Cover Replacement .

    3. Object Number: 52981 Size: SH
  3. Install the drive belt. Refer to Drive Belt Replacement .
  4. Install the camshaft covers. Refer to Camshaft Cover Replacement .