Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo, Regal 2001-2005

Crankshaft Damper (Balancer)

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Removal & Installation



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.
  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. Remove the crankshaft balancer bolt and washer.
  8.  
  9. Remove the crankshaft balancer using a three-leg puller such as J 24420-B, or equivalent.

    Click image to see an enlarged view

    Fig. Crankshaft balancer removal-3.1L engine

  10.  

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.  

3.4L Engine

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.
  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. Remove the crankshaft balancer bolt and washer.
  8.  
  9. Remove the crankshaft balancer using a three-leg puller such as J 24420-B, or equivalent.

    Click image to see an enlarged view

    Fig. Crankshaft balancer removal-3.4L engine

  10.  

To install:

  1. Clean all parts well. Apply a thin coat of sealer GM no. 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.  

3.5L & 3.9L Engines

WARNING
The factory recommended procedure for removing the crankshaft balancer is a lengthy and difficult procedure requiring special lifting and support equipment. The steering shaft must be separated and the vehicle subframe must be loosened and lowered for access to the crankshaft balancer. Careful work is required for reassembly. This is not a job for the inexperienced or ill-equipped.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the accessory drive belt.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the right front tire assembly. Locate and remove the right engine splash shield.
  8.  
  9. Place adjustable safety stands on the right side of the frame.
  10.  
  11. Remove the two right side frame bolts.
  12.  
  13. Lower the right side of the frame and engine using the adjustable safety stands to allow access to attach the three-legged puller to the crankshaft balancer.
  14.  
  15. 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 43442 is a toothed device that, after removing the torque converter cover, bolts to the block with its teeth engaging the teeth of the flywheel, effectively locking the crankshaft in place. Use care if using substitutes.
  16.  
  17. Loosen and remove the crankshaft balancer bolt.
  18.  
  19. Mount a three-legged puller into the recesses cast into the backside of the balancer inner hub. The factory recommended tool, J 41816, has an accessory piece J 43010 which goes into the nose of the crankshaft to protect the retainer bolt threads. Use care if using substitutes. If the crankshaft threads are damaged, repairs will be lengthy and expensive. Tighten the center screw on the puller until the balancer is drawn clear of the crankshaft end. Remove the balancer from the puller.

    Click image to see an enlarged view

    Fig. Use care when rigging a puller on the balancer. Note the nosepiece to protect the balancer bolt threads in the end of the crankshaft-3.5L (VIN H) engine



    Click image to see an enlarged view

    Fig. This tool installs the balancer by threading into the crankshaft then by turning the nut, the tool presses the balancer into place-3.5L (VIN H) engine

  20.  

To install:

  1. Clean all parts well. Inspect the balancer for signs of damage. Do not lubricate the crankshaft front oil seal or the crankshaft balancer sealing surfaces. The crankshaft balancer is installed into a dry seal.
  2.  
  3. Place the balancer in position on the crankshaft. A special tool, J 4201, is recommended to thread into the end of the crankshaft and then draw the balancer back into position. GM recommends engaging at least ten threads of the tool to the crankshaft, before pressing the balancer in place by tightening the nut on the tool until the large washer bottoms out on the crankshaft end. Use care if using substitutes.
    WARNING
    DO NOT attempt to hammer the balancer into place. It will be damaged.

  4.  
  5. Install the crankshaft balancer bolt. Using a torque angle meter, tighten to 37 ft. lbs. (50 Nm), plus as additional 125 degrees.
  6.  
  7. Remove the flywheel locking tool and install the torque converter cover.
  8.  
  9. Raise the right side of the frame with the engine, using the adjustable safety stands.
  10.  
  11. Install the two right side frame bolts.
  12.  
  13. Remove the adjustable safety stands.
  14.  
  15. Install the engine splash shield and right tire assembly. Lower the vehicle.
  16.  
  17. Install the remainder of the components in the reverse order of removal.
  18.  

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

  14.  
  15. Install an appropriate puller and draw the balancer from the crankshaft. Use care not to damage the end of the crankshaft.

    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

  16.  

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.
    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.

  4.  
  5. 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.
  6.  

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

  14.  
  15. Install an appropriate puller and draw the balancer from the crankshaft. Use care not to damage the end of the crankshaft.

    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

  16.  

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.
    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.

  4.  
  5. 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.
  6.  

5.3L Engine

This procedure requires the following special tools, or their equivalents:



Flywheel Holding Tool, EN 47699
 
Crankshaft Balance and Sprocket Installer, J 41665
 
Crankshaft Balancer Remover, J 41816
 
Crankshaft End Protector, J 41816-2
 
Steering Column Anti-Rotation Pin, J 42640
 
Torque Angle Meter, J 45059
 

  1. Install Steering Column Anti-Rotation Pin, tool no. J 42640 or equivalent.
  2.  
  3. Remove the accessory drive belt.
  4.  
  5. Remove the air cleaner upper housing.
  6.  
  7. Remove the engine mount strut.
  8.  
  9. Remove the starter motor.
  10.  
  11. Remove the front fender splash shield.
  12.  
  13. Remove the transmission bellhousing bolt located at approximately the 10 o'clock position when looking from the rear of the engine.
  14.  
  15. Disconnect the transaxle cooler lines at the transaxle.
  16.  
  17. Remove the stabilizer shaft link lower nuts.
  18.  
  19. Remove the intermediate steering shaft pinch bolt and separate the shaft from the steering gear.
  20.  
  21. Remove the front lower air deflector braces and the deflector.
  22.  
  23. Remove the radiator to frame braces.
  24.  
  25. Install the engine support fixture.
  26.  
  27. Raise and support the vehicle.
  28.  
  29. Remove the frame to body bolts.
  30.  
  31. Install Flywheel Holding Tool No. EN 47699, or equivalent, and bolt to the block and flywheel. Tighten the bolt to 44 ft. lbs. (60 Nm).
  32.  
  33. Remove the right front tire and wheel assembly.
  34.  
  35. Lower the engine approximately 4 in. (100mm).
  36.  
  37. Remove the crankshaft balancer bolt. Do not discard the crankshaft balancer bolt. The balancer bolt will be used during the balancer installation procedure.
  38.  
  39. Install the Crankshaft Balancer Remover, J 41816 and Crankshaft End Protector, J 41816-2, to the crankshaft balancer.
  40.  
  41. Remove the crankshaft balancer.
  42.  
  43. Remove the tools from the crankshaft balancer.
  44.  

To install:


NOTE
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.


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 onto the end of the crankshaft.
  2.  
  3. Using the Crankshaft Balance and Sprocket Installer, J 41665, 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.  
    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 the 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 tool.
    14.  

  4.  
  5. Install the USED crankshaft balancer bolt. Tighten the USED bolt to 240 ft. lbs. (330 Nm).
  6.  
  7. Remove the USED crankshaft balancer bolt.
    NOTE
    Important: The nose of the crankshaft should be recessed 0.094-0.176 in. (2.4-4.48mm) into the balancer bore.

  8.  
  9. Measure for a correctly installed balancer. If the balancer is not installed to the proper dimensions, install the special tool, J 41665, and repeat the installation procedure.
  10.  
  11. Install a NEW crankshaft balancer bolt and tighten as follows:
    1. First Pass: Tighten to 37 ft. lbs. (50 Nm)
    2.  
    3. Second Pass: Tighten an additional 140 degrees, using a torque angle meter.
    4.  

  12.  
  13. Remove the special tool and bolt from the block and flywheel.
  14.  
  15. Install the transmission bellhousing bolt located at approximately the 10 o'clock position when looking from the rear of the engine. Tighten the bolt to 55 ft. lbs. (75 Nm).
  16.  
  17. Raise and properly position the frame and install the frame to body bolts.
  18.  
  19. Install the frame to radiator braces.
  20.  
  21. Install the front lower air deflector.
  22.  
  23. Connect the intermediate steering shaft to the steering gear.
  24.  
  25. Install the stabilizer shaft link lower nuts.
  26.  
  27. Connect the transaxle cooler lines to the transaxle.
  28.  
  29. Remove the engine support fixture.
  30.  
  31. Install the front fender splash shield.
  32.  
  33. Install the starter motor.
  34.  
  35. Install the air cleaner upper housing.
  36.  
  37. Install the accessory drive belt.
  38.  
  39. Install the engine mount strut.
  40.  
  41. Install the right front tire and wheel assembly.
  42.  
  43. Use a scan tool to perform the crankshaft position (CKP) system variation learn procedure.
  44.  

This procedure requires the following special tools, or their equivalents:



Flywheel Holding Tool, EN 47699
 
Crankshaft Balance and Sprocket Installer, J 41665
 
Crankshaft Balancer Remover, J 41816
 
Crankshaft End Protector, J 41816-2
 
Steering Column Anti-Rotation Pin, J 42640
 
Torque Angle Meter, J 45059
 

  1. Install Steering Column Anti-Rotation Pin, tool no. J 42640 or equivalent.
  2.  
  3. Remove the accessory drive belt.
  4.  
  5. Remove the air cleaner upper housing.
  6.  
  7. Remove the engine mount strut.
  8.  
  9. Remove the starter motor.
  10.  
  11. Remove the front fender splash shield.
  12.  
  13. Remove the transmission bellhousing bolt located at approximately the 10 o'clock position when looking from the rear of the engine.
  14.  
  15. Disconnect the transaxle cooler lines at the transaxle.
  16.  
  17. Remove the stabilizer shaft link lower nuts.
  18.  
  19. Remove the intermediate steering shaft pinch bolt and separate the shaft from the steering gear.
  20.  
  21. Remove the front lower air deflector braces and the deflector.
  22.  
  23. Remove the radiator to frame braces.
  24.  
  25. Install the engine support fixture.
  26.  
  27. Raise and support the vehicle.
  28.  
  29. Remove the frame to body bolts.
  30.  
  31. Install Flywheel Holding Tool No. EN 47699, or equivalent, and bolt to the block and flywheel. Tighten the bolt to 44 ft. lbs. (60 Nm).
  32.  
  33. Remove the right front tire and wheel assembly.
  34.  
  35. Lower the engine approximately 4 in. (100mm).
  36.  
  37. Remove the crankshaft balancer bolt. Do not discard the crankshaft balancer bolt. The balancer bolt will be used during the balancer installation procedure.
  38.  
  39. Install the Crankshaft Balancer Remover, J 41816 and Crankshaft End Protector, J 41816-2, to the crankshaft balancer.
  40.  
  41. Remove the crankshaft balancer.
  42.  
  43. Remove the tools from the crankshaft balancer.
  44.  

To install:


NOTE
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.


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 onto the end of the crankshaft.
  2.  
  3. Using the Crankshaft Balance and Sprocket Installer, J 41665, 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.  
    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 the 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 tool.
    14.  

  4.  
  5. Install the USED crankshaft balancer bolt. Tighten the USED bolt to 240 ft. lbs. (330 Nm).
  6.  
  7. Remove the USED crankshaft balancer bolt.
    NOTE
    Important: The nose of the crankshaft should be recessed 0.094-0.176 in. (2.4-4.48mm) into the balancer bore.

  8.  
  9. Measure for a correctly installed balancer. If the balancer is not installed to the proper dimensions, install the special tool, J 41665, and repeat the installation procedure.
  10.  
  11. Install a NEW crankshaft balancer bolt and tighten as follows:
    1. First Pass: Tighten to 37 ft. lbs. (50 Nm)
    2.  
    3. Second Pass: Tighten an additional 140 degrees, using a torque angle meter.
    4.  

  12.  
  13. Remove the special tool and bolt from the block and flywheel.
  14.  
  15. Install the transmission bellhousing bolt located at approximately the 10 o'clock position when looking from the rear of the engine. Tighten the bolt to 55 ft. lbs. (75 Nm).
  16.  
  17. Raise and properly position the frame and install the frame to body bolts.
  18.  
  19. Install the frame to radiator braces.
  20.  
  21. Install the front lower air deflector.
  22.  
  23. Connect the intermediate steering shaft to the steering gear.
  24.  
  25. Install the stabilizer shaft link lower nuts.
  26.  
  27. Connect the transaxle cooler lines to the transaxle.
  28.  
  29. Remove the engine support fixture.
  30.  
  31. Install the front fender splash shield.
  32.  
  33. Install the starter motor.
  34.  
  35. Install the air cleaner upper housing.
  36.  
  37. Install the accessory drive belt.
  38.  
  39. Install the engine mount strut.
  40.  
  41. Install the right front tire and wheel assembly.
  42.  
  43. Use a scan tool to perform the crankshaft position (CKP) system variation learn procedure.
  44.  

 
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