GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN-48585 Crankshaft Balancer Guide
    • EN-48953 Camshaft Actuator Locking Tool
    • J 38112-A Crankshaft Balancer Holder
    • J 43653 Flywheel Holding Tool
    • J 45059 Angle Meter

For equivalent regional tools, refer to Special Tools.


    Object Number: 2148366  Size: SH

    Caution: Ensure both components are aligned correctly or serious engine damage will occur.

  1. Install the J 38112-A holder into the end of the crankshaft.
  2. Install the balancer (1) onto the EN-48585 guide . Use care to properly align the keyway and flats on the balancer with the oil pump drive.

  3. Object Number: 2148293  Size: SH

    Note: J 43653 locking tool may be used instead of J 38112-A holder to prevent crankshaft rotation.

  4. Install the J 38122-A holder  (1).
  5. Caution: Refer to Fastener Caution in the Preface section.

    Note: Always install a new crankshaft balancer retaining bolt and washer.

  6. Install a new retaining bolt and washer. Use the J 38122-A holder and a breaker bar to prevent the crankshaft from rotating when tightening the bolt. Tighten the bolt to 100 N·m (74 lb ft) plus 125 degrees using the J 45059 meter .

  7. Object Number: 2128100  Size: SH
  8. Install the EN-48953 locking tool  (1) and tighten the bolts into the cylinder head. Tighten the EN-48953 locking tool retaining bolts to 10 N·m (89 lb in).
  9. Release the timing chain tensioner by applying 45 N·m (33 lb ft) counterclockwise torque to the crankshaft balancer bolt.
  10. Remove the EN-48953 locking tool .