Crankshaft Balancer Installation (LS3, L99, or LSA)

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

For equivalent regional tools, refer to Special Tools .

Fig 1: Flywheel Holder
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.
1. Install the J 42386-A  holding tool and bolts.

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

Fig 2: Crankshaft Balancer Washer
Courtesy of GENERAL MOTORS COMPANY
2. Install the crankshaft balancer washer (1) onto the crankshaft balancer.
Fig 3: Crankshaft Balancer
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.

3. Position the balancer (1) and washer onto the end of the crankshaft.
Fig 4: Installing Balancer
Courtesy of GENERAL MOTORS COMPANY
4. Use the J 41665  balancer and sprocket installer and the J 41478  oil seal installer in order to install the balancer.
   1. Assemble the J 41478  oil seal installer threaded rod, nut, washer and the J 41665  balancer and sprocket 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 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.
Fig 5: Crankshaft Balancer Bolt
Courtesy of GENERAL MOTORS COMPANY
5. Install the used crankshaft balancer bolt (139) and tighten to 330 N.m (240 lb ft) to fully seat the balancer.
6. Remove the used crankshaft balancer bolt.
Fig 6: Identifying Hub To Crankshaft Distance
Courtesy of GENERAL MOTORS COMPANY
NOTE:

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

7. Measure for a correctly installed balancer.

   If the balancer is not installed to the proper dimensions, install the J 41665  balancer and sprocket installer and repeat the installation procedure.

Fig 7: Identifying Crankshaft Balancer Bolts
Courtesy of GENERAL MOTORS COMPANY
NOTE:

There are two crankshaft balancer bolt designs, one has a flanged head, no washer, and the other has a retained rotating washer. There are two different torque specifications for the final pass; the final torque angle is dependent on the bolt design.

8. Install the NEW crankshaft balancer bolt.
   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:
      • Balancer bolt with flanged head (1) tighten to 125 degrees using the J 45059  angle meter.
      • Balancer bolt with retained rotating washer (2) tighten to 200 degrees using the J 45059  angle meter.
9. Remove the J 42386-A  holding tool.