Crankshaft Balancer Installation (LS3 with Z52 Option, LS7)

Special Tools

• EN-47812:  Installer Bolt
• 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 Holding Tool
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to Fastener Caution .
NOTE:
• Note the position of the crankshaft balancer before removal. The balancer does not use a key or keyway for positioning. Mark or scribe the end of the crankshaft and the balancer before removal. The crankshaft balancer must be installed to the original position. 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 .
• 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: Balancer Weight
Courtesy of GENERAL MOTORS CORP.
2. 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 .
3. Install balance weights into the new balancer, if applicable.
Fig 3: Crankshaft Balancer Washer
Courtesy of GENERAL MOTORS CORP.
4. Install the crankshaft balancer washer (1) onto the crankshaft balancer.
Fig 4: View Of Crankshaft Balancer
Courtesy of GENERAL MOTORS CORP.
NOTE: The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.
5. Position the balancer (138) onto the end of the crankshaft.
Fig 5: Installer Tools
Courtesy of GENERAL MOTORS CORP.
6. Use the J 41665:  installer (2) and the EN-47812:  bolt (1) in order to install the balancer.
   1. Assemble the EN-47812:  bolt (1), nut, washer and the J 41665:  installer (2).

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

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

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

   5. Use a wrench and hold the end of the EN-47812:  bolt (1).
   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 6: View Of Crankshaft Balancer Bolt
Courtesy of GENERAL MOTORS CORP.
7. Install the used crankshaft balancer bolt (139) and tighten to 330 N.m (240 lb ft) to fully seat the balancer.
8. Remove the used crankshaft balancer bolt.
Fig 7: Identifying Hub To Crankshaft Distance
Courtesy of GENERAL MOTORS CORP.
NOTE: The nose of the crankshaft should be recessed 2.40-4.48 mm (0.094-0.176 in) into the balancer bore.
9. 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.
Fig 8: View Of Crankshaft Balancer Bolt
Courtesy of GENERAL MOTORS CORP.
10. 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 200 degrees using the J 45059:  meter.
11. Remove the J 42386-A:  holding tool.