Crankshaft Balancer Installation

Tools Required

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

Fig 1: View Of Special Tool & Bolts
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice .
IMPORTANT:
• The crankshaft balancer is balanced as an individual component. It is not necessary to mark the balancer prior to removal.
• The crankshaft balancer installation and bolt tightening involves a 4 stage tightening process. The first pass ensures that the balancer is installed completely onto the crankshaft. The second, third, and fourth passes tighten the NEW bolt to the proper torque.
• The used crankshaft balancer bolt is used only during the first pass of the balancer installation procedure. Install a NEW crankshaft balancer bolt and tighten as described in the second, third, and fourth passes of the balancer bolt tightening procedure.
• Ensure the teeth of the tool engage the engine flywheel teeth.
1. Install the J 42386-A  and bolts. See Special Tools .

   Use 1 M10 - 1.5 x 120 mm and 1 M10 - 1.5 x 45 mm bolt for proper tool operation.

   Tighten:  Tighten the J 42386-A  bolts to 50 N. See Special Tools .m (37 lb ft).

Fig 2: View Of Crankshaft Balancer
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.
2. Position the balancer (138) onto the end of the crankshaft.
Fig 3: View Of Balancer Installation Special Tools
Courtesy of GENERAL MOTORS CORP.
3. Use the J 41665  and the J 41478  in order to install the balancer. See Special Tools .
   1. Assemble the J 41478  threaded rod, nut, washer and the J 41665  installer. See Special Tools .

      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.
Fig 4: View Of Used Crankshaft Balancer Bolt
Courtesy of GENERAL MOTORS CORP.
4. Install the used crankshaft balancer bolt (139).

   Tighten:  Tighten the crankshaft balancer bolt to 330 N.m (240 lb ft).

5. Remove the used crankshaft balancer bolt.
Fig 5: Identifying Hub To Crankshaft Distance
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The nose of the crankshaft should be recessed 2.4-4.48 mm (0.094-0.176 in) into the balancer bore.
6. Measure for a correctly installed balancer.

   If the balancer is not installed to the proper dimensions, install the J 41665  and repeat the installation procedure. See Special Tools .

Fig 6: View Of New Crankshaft Balancer Bolt
Courtesy of GENERAL MOTORS CORP.
7. Install the NEW crankshaft balancer bolt (139).

   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  . See Special Tools .

8. Remove the J 42386-A  . See Special Tools .