Crankshaft Balancer Installation

Tools Required

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

Fig 1: Install J 42386 Crankshaft Balancer
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice in Cautions and Notices.
IMPORTANT:
• Note the position of the crankshaft balancer before removal, on manual transmission applications. 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 balancer 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.
• 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 will be 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.

   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.m (37 lb ft).

Fig 2: Installing/Removing Balancer Weights In Crankshaft Balancer
Courtesy of GENERAL MOTORS CORP.
2. Using the old balancer as a reference, mark or scribe the NEW balancer in the same location, if required.

   Install balance weights into the NEW balancer, if required. Refer to Engine Balancing and Crankshaft Balancer Cleaning and Inspection .

Fig 3: Identifying Harmonic Balancer Bolt
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
• Align the scribe mark on the balancer with the scribe mark on the crankshaft.
• The balancer should be positioned onto the end of the crankshaft, as straight as possible, prior to tool installation.
3. Install the balancer onto the end of the crankshaft.
Fig 4: Installing Balancer Using J 41665
Courtesy of GENERAL MOTORS CORP.
4. Use the J 41665  in order to install the balancer.
   1. Assemble the threaded rod, nut, washer and 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 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 tool.
Fig 5: Identifying Hub To Crankshaft Distance
Courtesy of GENERAL MOTORS CORP.
5. Install the used crankshaft balancer bolt.

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

6. Remove the used crankshaft balancer bolt.
IMPORTANT: The nose of the crankshaft should be recessed 2.40-4.48 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  and repeat the installation procedure.

Fig 6: Identifying Harmonic Balancer Bolt
Courtesy of GENERAL MOTORS CORP.
8. Install the NEW crankshaft balancer bolt.

   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  .

9. Remove the J 42386-A  .