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Installation Procedure

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NOTE:
  • 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 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 bolt and tighten as described in the second, third and fourth passes of the balancer bolt tightening procedure.
    Fig 1: Crankshaft Balancer
    GM1658138Courtesy of GENERAL MOTORS CORP.
    NOTE:

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

  1. Position the crankshaft balancer (138) onto the end of the crankshaft.
    2. Fig 2: Crankshaft Balancer Installation Special Tools
    GM1658286Courtesy of GENERAL MOTORS CORP.
  2. Install the J 41665 and the threaded rod from the J 41478 to crankshaft balancer and 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 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 J 41665 and the threaded rod.
    3. Fig 3: Crankshaft Balancer Bolt
    GM1658287Courtesy of GENERAL MOTORS CORP.
  3. Install the USED crankshaft balancer bolt (139). Tighten the USED bolt to 330 N.m (240 lb ft).
  4. Remove the USED crankshaft balancer bolt.
    5. Fig 4: Hub To Crankshaft Distance
    GM63245Courtesy of GENERAL MOTORS CORP.
    NOTE:

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

  5. Measure for a correctly installed balancer. If the balancer is not installed to the proper dimension, install the J 41665 and repeat the installation procedure.
    6. Fig 5: Crankshaft Balancer Bolt
    GM1658287Courtesy of GENERAL MOTORS CORP.
  6. Install the NEW crankshaft balancer bolt (139).
    1. Tighten the bolt a first pass to 150 N.m (110 lb ft).
    2. Loosen 360 degrees.
    3. Tighten the bolt a first pass to 80 N.m (59 lb ft).
    4. Tighten the bolt a final pass to 125 degrees using J 45059 .
    7. Fig 6: Flywheel Holding Tool
    GM1658136Courtesy of GENERAL MOTORS CORP.
  7. Remove the J 42386-A (1) and bolts.
  8. Install the starter motor. Refer to Starter Replacement .
  9. Install the cooling fan and shroud. Refer to Cooling Fan and Shroud Replacement (Non-HP2) .
  10. Install the A/C drive belt. Refer to Air Conditioning Compressor Belt Replacement (V8) .
  11. Perform the crankshaft position (CKP) system variation learn procedure. Refer to Crankshaft Position System Variation Learn .
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