GM Service Manual Online
For 1990-2009 cars only

Special Tools

EN-43650 Balancer Shaft Bearing Remover and Installer

For equivalent regional tools, refer to Special Tools.


    Object Number: 2146297  Size: SH
  1. Remove the balance shaft bearing carrier bolts.
  2. Note: 

       • It is possible to install the intake side balance shaft into the exhaust side and vice versa. Please use care not to install the balance shafts into the wrong bores. Engine vibration will result.
       • Do not remove the bolt holding the sprocket.

  3. Remove the balance shaft assemblies (1).

  4. Object Number: 2146298  Size: SH

    Caution: Proper centering of the tool is required on the balance shaft bushing. If the tool is not properly centered then damage to the bearing bore and block will occur.

  5. Install the EN-43650 remover / installer  (1) into the balance shaft hole. Insert the tool with the foot parallel to the shaft.

  6. Object Number: 2146299  Size: SH
  7. When the EN-43650 remover / installer is inserted in the block turn the EN-43650 remover / installer so that the foot becomes perpendicular to the shaft.
  8. Center the foot of the EN-43650 remover / installer on the balance shaft bushing.
  9. Once the EN-43650 remover / installer is centered on the balance shaft bushing, then insert the centering guide into the front balance shaft bore and tighten the nut with an appropriate wrench.
  10. When the EN-43650 remover / installer is properly installed, before removing the bushing, the end of the tool should be 116 mm (4.6 in) (a) from the block face.

    If the EN-43650 remover / installer is less than approximately 114 mm (4.5 in) (a), recheck the tool alignment.


    Object Number: 2146300  Size: SH
  11. Tighten the nut on the EN-43650 remover / installer  (1) until the tension releases. When the tension releases, remove the EN-43650 remover / installer and the balance shaft bushing (2).