Crankshaft Balancer Installation

Special Tools

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

Equivalent regional tools: Special Tools 

1. Courtesy of GENERAL MOTORS COMPANY

   CAUTION:

   Refer to Fastener Caution .

   NOTE:

   • Ensure the teeth of the tool engage the engine flywheel teeth.
   • The used crankshaft balancer bolt is used only during the installation procedure. Install a NEW crankshaft balancer bolt during final assembly.

   Install the J-42386-A  tool (1) and bolts.

   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  tool bolts to 50 N.m (37 lb ft).

2. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

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

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

3. Courtesy of GENERAL MOTORS COMPANY

   Use the J-41665  installer and the J-41478  installer in order to install the balancer.

   1. Assemble the J-41478  installer threaded rod, nut, washer and the J-41665  installer.

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

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

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

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

4. Courtesy of GENERAL MOTORS COMPANY

   Install the used crankshaft balancer bolt (139) and tighten to 330 N.m (240 lb ft) to fully seat the balancer.

5. Remove the used crankshaft balancer bolt.

6. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   The nose of the crankshaft should be recessed 2.40 - 4.48 mm (0.094 - 0.176 in) into the balancer bore.

   Measure for a correctly installed balancer. If the balancer is not installed to the proper dimensions, install the J-41665  installer and repeat the installation procedure.

7. Courtesy of GENERAL MOTORS COMPANY

   Install the NEW crankshaft balancer bolt (139):

   1. Tighten the crankshaft balancer bolt to 150 N.m (110 lb ft).
   2. Loosen the crankshaft balancer bolt 360 degrees.
   3. Tighten the crankshaft balancer bolt to 80 N.m (59 lb ft).
   4. Tighten the crankshaft balancer bolt a final pass to 125 degrees using the J 45059  meter.
8. Remove - J-42386-A  tool