CTS 2003-2005

Crankshaft Damper (Balancer)

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Removal & Installation



2.8L & 3.6L Engines
  1. Remove the A/C compressor and power steering pump drive belt.
  2.  
  3. Remove the generator and water pump drive belt.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Remove the transmission bell housing inspection hole cover.
  8.  
  9. Install the EN-48018 Flywheel Holding tool.
  10.  
  11. Remove the front air deflector.
  12.  
  13. Remove the crankshaft balancer bolt.
  14.  
  15. Using a puller, remove the crankshaft balancer.
  16.  

To install:

  1. Use the Crankshaft Balancer Installer J-41998-B nut, bearing and washer to install the crankshaft balancer.
    NOTE
    Do not lubricate the crankshaft front oil seal or crankshaft balancer sealing surfaces. The crankshaft balancer is installed into a dry seal.

  2.  
  3. Apply lubricant to the inside of the crankshaft balancer hub bore.
  4.  
  5. Place the crankshaft balancer in position on the crankshaft.
  6.  
  7. Thread the balancer tool in the crankshaft. Ensure you engage at least 10 threads before pressing the crankshaft balancer in place.
  8.  
  9. Push the crankshaft balancer into position by tightening the nut on the tool until the large washer bottoms out on the crankshaft end.
  10.  
  11. Remove the tool.
  12.  
  13. Install the crankshaft balancer bolt.
  14.  
  15. Tighten the crankshaft balancer bolt to 74 ft. lbs. (100 Nm).
  16.  
  17. Tighten the crankshaft balancer bolt an additional 150 degrees.
  18.  
  19. Remove the flywheel holding tool.
  20.  
  21. Install the transmission bell housing inspection hole cover.
  22.  
  23. Install the generator and water pump drive belt.
  24.  
  25. Install the A/C compressor and power steering pump drive belt.
  26.  

3.1L & 3.4L Engines

WARNING
The inertial weight section of the crankshaft balancer (also called a Crankshaft Damper, or Torsional Damper) is assembled to the hub with a rubber type material. The correct installation procedures, with the proper tools, must be followed or movement of the inertial weight section of the hub will destroy the tuning of the crankshaft balancer.

  1. Remove the drive belt. Please see Section 1.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the right front tire assembly. Locate and remove the right splash shield.
  6.  
  7. On the 3.4L (VIN X) engine, remove the three bolts holding the crankshaft pulley and remove the pulley.
  8.  
  9. Remove the crankshaft balancer bolt and washer.
  10.  
  11. Remove the crankshaft balancer using a three-leg puller such as J 24420-B, or equivalent.
  12.  



Click image to see an enlarged view

Fig. Crankshaft balancer removal-3.1L engine

To install:

  1. Clean all parts well. Apply a thin coat of sealer GM #12345739, or equivalent, to the keyway of the balancer. This is to help prevent oil from wicking along the keyway and causing a leak.
  2.  
  3. Install the crankshaft balancer using tool J 29113 Crankshaft Balancer Installer or equivalent, to draw the balancer onto the crankshaft. Do not hammer on the balancer.
  4.  
  5. Install the crankshaft bolt and washer and torque to 76-80 ft. lbs. (103-108 Nm).
  6.  
  7. Install the remainder of the components in the reverse order of removal.
  8.  

3.2L Engine
  1. Remove the intake air resonator.
  2.  
  3. Remove the drive belt.
  4.  
  5. Remove the crankshaft balancer bolts.
  6.  
  7. Remove the crankshaft balancer from the crankshaft sprocket.
  8.  

To install:

  1. Install the crankshaft balancer to the crankshaft sprocket.
  2.  
  3. Install the crankshaft balancer bolts and tighten to 15 ft. lbs. (20 Nm).
  4.  
  5. Install the drive belt.
  6.  
  7. Install the intake air resonator.
  8.  

3.8L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. On the 3.8L (VIN 1) engine, remove the supercharger belt.
  4.  
  5. Remove the accessory drive belt. Please see Section 1.
  6.  
  7. Raise and safely support the vehicle. Remove the right front tire assembly and inner fender splash shield.
  8.  
  9. Remove the flywheel cover.
  10.  
  11. GM recommends a device be used to lock the flywheel to keep the crankshaft from turning when the balancer center bolt is being removed. Their tool, J 37096 is a toothed device that, after removing the torque converter cover, is positioned so its teeth engage the teeth of the flywheel. This particular tool requires an assistant to hold the tool with a breaker bar. Use care if using substitutes.
  12.  
  13. Remove the crankshaft balancer retaining bolt.
  14.  


NOTE
Service the balancer as a unit. Do not separate the pulley from the balancer hub.

  1. Install an appropriate puller and draw the balancer from the crankshaft. Use care not to damage the end of the crankshaft.
  2.  



Click image to see an enlarged view

Fig. A puller is needed to draw the balancer from the crankshaft. Also shown is a tool to hold the flywheel to keep the engine from turning when the retaining bolt is loosened or tightened

To install:

  1. Coat the front cover seal contact area on the crankshaft balancer and the seal surface with engine oil.
  2.  
  3. Install the balancer and push on as far as it will go.
  4.  


WARNING
This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. Components may be damaged.

  1. Install the crankshaft balancer retainer bolt and, with the flywheel restrained from turning, tighten the bolt with a torque angle meter to 111 ft. lbs. (150 Nm) plus an additional 76 degrees.
  2.  

5.7L Engine

NOTE
For manual transmission applications, 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 component 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.

  1. Remove the accessory drive belts.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the transmission bell housing inspection hole cover.
  6.  
  7. Install Flywheel Holding tool J-42386-A and bolts. Use one M10 - 1.5 x 120 mm and one M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the bolts to 37 ft. lbs. (50 Nm).
  8.  
  9. Remove the crankshaft balancer bolt. Do not discard the crankshaft balancer bolt. The balancer bolt will be used during the balancer installation procedure. 
  10.  
  11. Mark or scribe the crankshaft balancer and the end of the crankshaft. Note the balancer installed position on the crankshaft for assembly.
  12.  
  13. Use a puller and remove the crankshaft balancer.
  14.  
  15. Note the position of crankshaft balancer weights, if applicable.
  16.  

To install:

  1. 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.
  2.  
  3. Align the scribe mark on the balancer with the scribe mark on the crankshaft.
  4.  
  5. Position the balancer on the end of the crankshaft as straight as possible.
  6.  
  7. Install the balancer onto the end of the crankshaft.
  8.  
  9. Use the Crankshaft Balancer Installer J-41665 and Oil Seal Installer J-41478 as follows:
    1. Assemble the threaded rod, nut, washer and the installer. Insert the smaller end of the installer into the front of the balancer.
    2.  
    3. Use a wrench and hold the hex end of the threaded rod.
    4.  
    5. Use a second wrench and rotate the installation tool nut clockwise until the balancer is started onto crankshaft.
    6.  
    7. Remove the tool and reverse the installation tool. Position the larger end of the installer against the front of the balancer.
    8.  
    9. Use a wrench and hold the hex end of the threaded rod.
    10.  
    11. Use a second wrench and rotate the installation tool nut clockwise until the balancer is installed onto the crankshaft.
    12.  
    13. Remove the balancer installation tools.
    14.  

  10.  
  11. Install the used crankshaft balancer bolt and tighten to 240 ft. lbs. (330 Nm).
  12.  
  13. Remove the used crankshaft balancer bolt.
    NOTE
    Ensure the nose of the crankshaft is recessed 2.40-4.48 mm (0.094-0.176 in) into the balancer bore.

  14.  
  15. Measure for a correctly installed balancer. If the balancer is not installed to the proper dimensions, reinstall the tool and repeat the installation procedure.
  16.  
  17. Install the NEW crankshaft balancer bolt.
  18.  
  19. Tighten the crankshaft balancer bolt a first pass to 37 ft. lbs. (50 Nm), then tighten the crankshaft balancer bolt a second pass to 140 degrees.
  20.  
  21. Remove the flywheel holding tool.
  22.  
  23. Install the accessory drive belt.
  24.  

 
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