GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN-47812 Installer Bolt
    • J 41665-A Crankshaft Balancer and Sprocket Installer
    • J 42386-A Flywheel Holding Tool
    • J 45059 Angle Meter

For equivalent regional tools, refer to Special Tools

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1552525  Size: SH

    Note: 

       • If replacing the crankshaft balancer, note the location of any existing balance weights, if applicable. Install new balance weights into the new crankshaft balancer, if applicable. Crankshaft balance weights must be installed into the new balancer in the same location as the old balancer. A properly installed balance weight will be either flush or below flush with the face of the balancer. Refer to Engine Balancing and Crankshaft Balancer Cleaning and Inspection.
       • The crankshaft balancer installation and bolt tightening involves a 4 step 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.

  1. Install the J 42386-A holding tool and bolts.
  2. Use 1 M10 - 1.5 x 120 mm and 1 M10 - 1.5 x 45 mm bolt for proper tool operation and tighten the J 42386-A holding tool bolts to 50 N·m (37 lb ft).


    Object Number: 63153  Size: SH
  3. Using the old balancer as a reference, mark or scribe the new balancer in the same location, if applicable. Refer to Crankshaft Balancer Cleaning and Inspection.
  4. Install balance weights into the new balancer, if applicable.

  5. Object Number: 1759519  Size: SH
  6. Install the crankshaft balancer washer (1) onto the crankshaft balancer.

  7. Object Number: 1777113  Size: SH

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

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

  9. Object Number: 1552514  Size: SH
  10. Use the J 41665-A installer  (2) and the EN-47812 installer bolt  (1) in order to install the balancer.
  11. 6.1. Assemble the EN-47812 installer bolt  (1), nut, washer and the J 41665-A installer  (2).

    Insert the smaller end of the J 41665-A installer  (2) into the front of the balancer.

    6.2. Use a wrench and hold the hex end of the EN-47812 installer bolt  (1).
    6.3. Use a second wrench and rotate the installation tool nut clockwise until the balancer is started onto the crankshaft.
    6.4. Remove the J 41665-A installer  (2) and reverse the installation tool.

    Position the larger end of the J 41665-A installer  (2) against the front of the balancer.

    6.5. Use a wrench and hold the end of the EN-47812 installer bolt  (1).
    6.6. Use a second wrench and rotate the installation tool nut clockwise until the balancer is installed onto the crankshaft.
    6.7. Remove the balancer installation tools.

    Object Number: 1552516  Size: SH
  12. Install the NEW crankshaft balancer bolt (139) and:
  13. • Tighten the crankshaft balancer bolt a first pass to 150 N·m (110 lb ft).
    • Loosen the crankshaft balancer bolt a second pass 360 degrees.
    • Tighten the crankshaft balancer bolt a third pass to 50 N·m (37 lb ft).
    • Tighten the crankshaft balancer bolt a final pass to 230 degrees using the J 45059 meter .
  14. Remove the J 42386-A tool .