GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H2 🢒 Engine 🢒 Engine Cooling 🢒 Crankshaft Balancer Replacement

Special Tools

    • J 41478 Crankshaft Front Oil Seal Installer
    • J 41816 Crankshaft Balancer Remover
    • J 41816-2 Crankshaft End Protector
    • J 42386-A Flywheel Holding Tool
    • J 41665 Crankshaft Balancer and Sprocket Installer
    • J 45059 Angle Meter

Removal Procedure
  1. Remove the fan shroud. Refer to Cooling Fan and Shroud Replacement .
  2. Remove the starter motor. Refer to Starter Motor Replacement .

    3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 260126 Size: SH

    Important: 

       • Make sure that the teeth of the J 42386-A are fully engaged into the flywheel ring gear teeth.
       • The crankshaft balancer is balanced as an individual component. It is not necessary to mark the balancer prior to removal.

  3. Install the J 42386-A .

    4. Use one M10-1.5 x 120 mm and one M10-1.5 x 45 mm bolt for proper tool operation.

    Tighten
    Tighten the J 42386-A to 50 N·m (37 lb ft).


    Object Number: 260154 Size: SH
  4. Remove the crankshaft balancer bolt.

    5. Do not discard the crankshaft balancer bolt. The balancer bolt will be used during the balancer installation procedure.


    Object Number: 156164 Size: SH
  5. Use the J 41816 and J 41816-2 in order to remove the crankshaft balancer.
  6. Remove the J 41816 and the J 41816-2 from the crankshaft balancer.
  7. Clean and inspect the crankshaft balancer. Refer to Crankshaft Balancer Cleaning and Inspection .

Installation Procedure

Important: 

   • Make sure that the teeth of J 42386-A are fully engaged into the flywheel ring gear teeth.
   • The used crankshaft balancer bolt will be used only during the first pass of the balancer installation procedure. Install a NEW bolt and tighten as described in the second, third and forth passes of the balancer bolt tightening procedure.
   • The crankshaft balancer installation and bolt tightening involves a four stage tightening process. The first pass ensures that the balancer is installed completely onto the crankshaft. The second, third, and forth passes tighten the new bolt to the proper torque.
   • The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.


    Object Number: 260154 Size: SH
  1. Install the crankshaft balancer onto the end of the crankshaft.

    2. Object Number: 63187 Size: SH
  2. Use the J 41665 and J 41478 for the following steps:
    3. 2.1. Assemble the J 41478 threaded rod, nut, washer and J 41665 installer.

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

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

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

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

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 63245 Size: SH
  3. Install the used crankshaft balancer bolt.

    4. Tighten
    Tighten the USED crankshaft balancer bolt to 330 N·m (240 lb ft).

  4. Remove the used crankshaft balancer bolt.

    5. Important: The nose of the crankshaft should be recessed 2.4-4.48 mm (0.094-0.176 in) into the balancer bore.

  5. Measure for a correctly installed balancer.

    6. If the balancer is not installed to the proper dimensions, install the J 41665 .

  6. Install a NEW crankshaft balancer bolt.

    7. Tighten

    1. Tighten the crankshaft balancer bolt a first pass to 50 N·m (37 lb ft).
    2. Tighten the crankshaft balancer bolt a second pass to 140 degrees using the J 45059 .
  7. Remove the J 42386-A .
  8. Install the starter motor. Refer to Starter Motor Replacement .
  9. Install the fan shroud . Refer to Cooling Fan and Shroud Replacement .
  10. Install the accessory drive belt, if not equipped with A/C. Refer to Drive Belt Replacement - Accessory .
  11. Install the A/C drive belt, if equipped. Refer to Air Conditioning Compressor Belt Replacement .
  12. Perform the crankshaft position (CKP) system variation learn procedure. Refer to Crankshaft Position System Variation Learn .