GM Service Manual Online
For 1990-2009 cars only

    Object Number: 54238  Size: SH
  1. Prepare a piece of cardboard, or equivalent, numbered one to five for bearing identification. Main bearing journals are numbered from the front of the engine.
  2. Remove the upper main bearing halves from the upper crankcase.
  3. Place the upper main bearing halves on the cardboard in the correct positions. Note that the number three bearing is the thrust bearing.

  4. Object Number: 54237  Size: SH
  5. Remove the lower main bearing halves from the lower crankcase.
  6. Place the lower main bearing halves in the correct positions on the cardboard.