Installation Procedure

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Important:

Make sure that the teeth of J 42386-A mesh with the teeth of the engine flywheel.
The used crankshaft balancer bolt will be used only during the first pass of the balancer installation procedure. Install a NEW bolt and tighten as described in the second, third and forth passes of the balancer bolt tightening procedure.
The crankshaft balancer installation and bolt tightening involves a four stage tightening process. The first pass ensures that the balancer is installed completely onto the crankshaft. The second, third, and forth passes tighten the new bolt to the proper torque.

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

Install the crankshaft balancer onto the end of the crankshaft.

Fig 1: Installing Crankshaft Balancer
Courtesy of GENERAL MOTORS CORP.
Use the J 41665 in order to install the crankshaft 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 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 tool.
Fig 2: Installing Crankshaft Balancer Using J 41665
Courtesy of GENERAL MOTORS CORP.
Install the used crankshaft balancer bolt.
Tighten

Tighten the USED crankshaft balancer bolt to 330 N.m (240 lb ft).
Remove the used crankshaft balancer bolt.
Important: The nose of the crankshaft should be recessed 2.4-4.48 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 and repeat the installation procedure.

Fig 3: Measuring Recess Of Crankshaft Nose Into Balancer Bore
Courtesy of GENERAL MOTORS CORP.
Install a 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 J 36660-A .
Remove the J 42386-A and bolts.
Install the starter motor. Refer to STARTER MOTOR REPLACEMENT (4.8L, 5.3L & 6.0L) or STARTER MOTOR REPLACEMENT (4.3L) .
Install the fan shroud - lower. Refer to FAN SHROUD REPLACEMENT .
Install the accessory drive belt (if not equipped with A/C). Refer to Drive Belt Replacement - Accessory .
Install the A/C drive belt (if equipped). Refer to Drive Belt Replacement - Air Conditioning .
Perform the crankshaft position (CKP) system variation learn procedure. Refer to CKP SYSTEM VARIATION LEARN PROCEDURE .