GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN 47699 Flywheel Holding Tool
    • J 41478 Crankshaft Front Oil Seal Installer
    • J 41665 Crankshaft Balancer and Sprocket Installer
    • J 45059 Angle Meter

For equivalent regional tools, refer to Special Tools.

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1602753  Size: SH

    Note: 

       • The crankshaft balancer is balanced as an individual component. It is not necessary to mark the balancer prior to removal.
       • The crankshaft balancer installation and bolt tightening involves a 4 stage tightening process. The first pass ensures that the balancer is installed completely onto the crankshaft. The second, third and fourth passes tighten the NEW bolt to the proper torque.
       • The used crankshaft balancer bolt is used only during the first pass of the balancer installation procedure. Install a NEW crankshaft balancer bolt and tighten as described in the second, third and fourth passes of the balancer bolt tightening procedure.
       • Ensure the teeth of the tool engage the engine flywheel teeth.

  1. Install the EN 47699 tool  (2), spacer (1), and bolt (3) to the block and flywheel.

  2. Object Number: 1602754  Size: SH
  3. Tighten the EN 47699 tool bolt (1) to 60 N·m (44 lb ft).

  4. Object Number: 1411874  Size: SH

    Note: The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.

  5. Position the balancer (138) onto the end of the crankshaft.

  6. Object Number: 1411964  Size: SH
  7. Use the J 41478 installer and the J 41665 installer in order to install the balancer.
  8. 4.1. Assemble the J 41478 installer threaded rod, nut, washer and J 41665 installer installer.

    Insert the smaller end of the installer into the front of the balancer.

    4.2. Use a wrench and hold the hex end of the threaded rod.
    4.3. Use a second wrench and rotate the installation tool nut clockwise until the balancer is started onto the crankshaft.
    4.4. Remove the tool and reverse the installation tool.

    Position the larger end of the installer against the front of the balancer.

    4.5. Use a wrench and hold the hex end of the threaded rod.
    4.6. Use a second wrench and rotate the installation tool nut clockwise until the balancer is installed onto the crankshaft.
    4.7. Remove the balancer installation tools.

    Object Number: 1411870  Size: SH
  9. Install the NEW crankshaft balancer bolt (139).
  10. 5.1. Tighten the crankshaft balancer bolt a first pass to 150 N·m (110 lb ft).
    5.2. Loosen the crankshaft balancer bolt a second pass 360 degrees.
    5.3. Tighten the crankshaft balancer bolt a third pass to 50 N·m (37 lb ft).
    5.4. Tighten the crankshaft balancer bolt a final pass 230 degrees using the J 45059 meter .
  11. Remove the EN 47699 tool spacer and bolt.