GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • J 6125-1B Slide Hammer Adapter
    • J 41818 Crankshaft Bearing Cap Remover

Crankshaft End Play Measurement

  1. Place a dial indicator at the crankshaft nose.
  2. Gently force the crankshaft to the extreme front and rear positions with a pry tool while monitoring the movement of the dial indicator.
  3. The crankshaft end play should not exceed specifications. Refer to Engine Mechanical Specifications .
  4. If the specifications are exceeded inspect the thrust bearing thrust OD and the crankshaft thrust wall for wear and/or excessive runout. Refer to Engine Mechanical Specifications .
  5. Replace the thrust bearing or crankshaft as necessary.

Crankshaft Removal


    Object Number: 902789  Size: SH
  1. Remove the crankshaft bearing cap side bolts.
  2. Remove the crankshaft bearing cap outer bolts.
  3. Remove the crankshaft bearing cap inner bolts.

  4. Object Number: 1905889  Size: SH
  5. Remove the crankshaft bearing caps using the J 6125-1B  (1) and J 41818  (2) .

  6. Object Number: 1866875  Size: SH
  7. Using two hands, lift the crankshaft straight up from the engine block.
  8. Place the crankshaft in a secure place.

  9. Object Number: 1864436  Size: SH
  10. Remove the crankshaft key from the nose of the crankshaft, if damaged.

Crankshaft Bearing Removal

  1. Prepare a piece of cardboard or equivalent, numbered 1-4 for bearing identification. Main bearing journals are numbered from the front of the engine.

  2. Object Number: 1313745  Size: SH
  3. Remove the crankshaft upper bearing halves from the cylinder block. Note the position of the thrust bearing (1) at the number 3 journal (2).
  4. Place the crankshaft upper bearing halves on the cardboard in the correct positions. Note that the number 3 bearing is the thrust bearing.

  5. Object Number: 902744  Size: SH
  6. Remove the crankshaft lower bearing halves from the crankshaft bearing caps.
  7. Place the crankshaft lower bearing halves in the correct positions on the cardboard.