GM Corvette 1984-1996 Repair Guide

Crankshaft Damper

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REMOVAL & INSTALLATION



On some vehicles, the crankshaft damper is also referred to as the balancer.

5.7L (VIN 8) Engine

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. If necessary, remove the water pump damper.
  4.  
  5. Remove the retainers, then remove the crankshaft pulley
  6.  
  7. Remove the serpentine drive belt.
  8.  
  9. On some vehicles, it may be necessary to disconnect and plug the power steering line in order to get access to the damper with the removal puller.
  10.  


WARNING
Using any other type of puller, such as a universal claw, which pulls on the outside of the hub, can destroy the damper. The outside ring is permanently bonded to hub. Using the wrong puller could break the bond.

  1. Install a harmonic balancer removal tool, or suitable puller on the damper. Turn the puller screw, then remove the damper.
  2.  
  3. Check the front cover seal for damage.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the crankshaft torsional damper-1989 5.7L (VIN 8) engine shown

To install:
  1. Use clean engine oil to coat the seal contact area on the damper.
  2.  
  3. Place the damper in position over the woodruff key on the crankshaft.
  4.  
  5. Pull the damper onto the crankshaft as follows:
    1. Install the appropriate threaded end of the harmonic balancer tool into the crankshaft. Install the tool in the crankshaft so that at least 1 / 2 in. (13mm) of the threads are engaged.
    2.  
    3. Install the plate, thrust bearing and nut to complete tool installation.
    4.  
    5. Pull the damper into position.
    6.  
    7. Remove the tool from the crankshaft, then install the damper retaining bolt. Tighten the bolt to 60 ft. lbs. (81 Nm).
    8.  

  6.  
  7. Install the crankshaft pulley.
  8.  
  9. If removed, unplug and install the power steering line. Tighten the center bolt to 70 ft. lbs. (95 Nm) and the outer bolts to 32 ft. lbs. (43 Nm).
  10.  
  11. If removed, install the water pump damper.
  12.  
  13. Install the serpentine drive belt.
  14.  
  15. Connect the negative battery cable.
  16.  

5.7L (VIN J) Engine

See Figures 2, 3 and 4

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the power steering gear, as outlined in Suspension & Steering of this repair guide.
  4.  
  5. Remove the serpentine belt.
  6.  
  7. Remove the bolt and washer holding the damper to the crankshaft.
  8.  



Click image to see an enlarged view

Fig. Fig. 2: Remove the damper bolt and washer

  1. Using a suitable puller remove the damper from the crankshaft.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: You MUST use the proper type of puller when removing the damper from the crankshaft

  1. Remove the key from the crankshaft.
  2.  

If you are replacing the damper, you must install new balance weights in the same hold locations as found on the old damper.

To install:
  1. Install the key in the crankshaft. The key should be check to be sure it is properly seated in the keyway while installing the damper.
  2.  
  3. Install the damper using tool J 38463 or equivalent torsional damper installation tool.
  4.  



Click image to see an enlarged view

Fig. Fig. 4: Installation of the crankshaft damper using the proper tools

  1. Apply Loctite® 262, or equivalent to the damper bolts threads, then install the washer and bolt. Tighten the bolt to 148 ft. lbs. (200 Nm).
  2.  
  3. Install the serpentine drive belt.
  4.  
  5. Install the steering gear, as outlined in Suspension & Steering of this repair guide.
  6.  

5.7L (VIN P and 5) Engines

See Figure 5

This procedure covers both removal of the crankshaft balancer (damper) and hub assembly.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air intake duct.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the motor mount nuts.
  8.  
  9. Remove the power steering fluid cooler.
  10.  


WARNING
When raising and supporting the engine, NEVER place a jack under the oil pan, crankshaft pulley or any sheetmetal. There is a minimal clearance between the oil pan and the pump screen. Jacking against the pan could cause sufficient deformation to damage the oil pickup unit.

  1. Raise the engine enough so that you can access the balancer with the removal tool.
  2.  
  3. Unfasten the balancer bolts/screws, then remove the balancer assembly.
  4.  
  5. Disconnect and plug the power steering line from the steering gear.
  6.  


WARNING
Do NOT crank the engine over after marking the hub and front cover. Rotating the crankshaft will misalign the installation of the balancer to the crankshaft and possibly cause engine imbalance.

  1. Matchmark the crankshaft hub to the engine front cover.
  2.  
  3. Remove the crankshaft hub bolt/screw and washer.
  4.  
  5. Remove the crankshaft hub using a suitable crankshaft hub removal/installation tool.
  6.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the crankshaft balancer and hub assemblies

To install:
  1. If the engine was accidently cranked over after matchmarking the hub and front cover, you must perform the following steps before installing the crankshaft hub:
    1. Set the No. 1 piston to Top Dead Center (TDC).
    2.  
    3. Install the crankshaft hub with the cast arrow on the hub in the 12 o'clock position.
    4.  

  2.  
  3. Install the crankshaft hub using a suitable hub removal/installation tool.
  4.  
  5. Install the crankshaft hub washer and bolt/screw.
  6.  
  7. Raise the engine.
  8.  
  9. Install the crankshaft balancer and retaining bolts/screws.
  10.  
  11. Tighten the crankshaft hub bolt to 70-75 ft. lbs. (95-102 Nm), and the balancer bolts/screw to 60 ft. lbs. (81 Nm).
  12.  
  13. Unplug and connect the power steering line to the steering gear.
  14.  
  15. Carefully lower the engine.
  16.  
  17. Install the power steering fluid cooler.
  18.  
  19. Install the motor mount nuts and tighten to 40 ft. lbs. (54 Nm).
  20.  
  21. Carefully lower the vehicle.
  22.  
  23. Install the serpentine drive belt.
  24.  
  25. Install the air intake duct and connect the negative battery cable.
  26.  
  27. Properly bleed the power steering system, as outlined in Suspension & Steering of this repair guide.
  28.  

 
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