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

Removal Procedure
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  2. Remove the oil pump. Refer to Oil Pump Replacement .
  3. Remove the camshaft covers. Refer to Camshaft Cover Replacement .

    4. Object Number: 53003 Size: SH
  4. Remove the three timing chain tensioners.

    5. Object Number: 53645 Size: SH
  5. Remove the camshaft sprocket bolts from all four camshafts.
  6. Remove the camshaft sprockets.

    7. Object Number: 52990 Size: SH
  7. Remove the secondary drive chains from around the intermediate shaft sprocket.
  8. Remove the one bolt from the intermediate shaft sprocket.

    9. Object Number: 62341 Size: SH
  9. Slide the gears and primary drive chain off the crankshaft and intermediate shaft.
  10. Do not remove the intermediate shaft unless wear is evident.

Installation Procedure
  1. Retime the camshafts. Refer to Setting Camshaft Timing .
  2. Install the oil pump. Refer to Oil Pump Replacement .
  3. Install the camshaft covers. Refer to Camshaft Cover Replacement .
  4. Install the engine front cover. Refer to Engine Front Cover Replacement .

    5. Object Number: 53228 Size: SH
  5. Install the idler puller and the belt tensioner.
  6. Install the drive belt. Refer to Drive Belt Replacement .