ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Crankshaft Damper

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REMOVAL & INSTALLATION



Except Diesel Engine

See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Loosen the pulley and/or damper retaining bolts-in this case all must be removed before the pulley can be separated



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Fig. Fig. 2: The damper retaining bolt is threaded into the center of the hub



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Fig. Fig. 3: With the bolts removed, separate the pulley from the hub



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Fig. Fig. 4: Use a threaded damper puller to draw the hub from the end of the crankshaft



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Fig. Fig. 5: Once the hub is loosened carefully withdraw the hub from the end of the crankshaft

Most of the engines covered in this guide are equipped with a crankshaft hub and pulley assembly. The pulley is usually mounted to the hub using 3 or so bolts around the inner circle of the pulley. The center mounting bolt is used to retain the hub to the crankshaft, but may also be used to retain the pulley. If the center mounting bolt also retains the pulley, a washer can normally be seen between the bolt head and the inner lip of the pulley.

  1. Disconnect the negative battery cable.
  2.  
  3. Loosen and remove the accessory drive belts or serpentine drive belt from the crankshaft damper.
  4.  
  5. If necessary for access on certain models, remove the fan assembly.
  6.  
  7. Remove the pulley mounting bolts from the pulley and damper assembly. If the center mounting bolt is not used to retain the pulley, it may be separated from the hub at this time and removed from the engine.
  8.  
  9. Spray the damper bolt with penetrating oil and allow it to soak in for at least a few minutes. Loosen and remove the center crankshaft damper bolt. If the pulley was not removed earlier, it should be free now.
  10.  

If damper bolt removal is difficult, various methods may be used to hold the crankshaft while loosening or tightening the bolt. One method involves installing a flywheel holding fixture to prevent the crankshaft from turning. A holding tool may be available for some dampers which threads into the pulley bolt holes. But most importantly of all, allow the penetrating oil to do the work when loosening an old damper bolt and reapply oil, as necessary. If you have the time, you might even want the oil to sit overnight.

  1. Remove the damper from the end of the crankshaft using a suitable threaded damper puller, NOT a jawed-type puller which would most likely destroy dampers with bonded hubs.
  2.  


WARNING
The use of any other type of puller, such as a universal claw type which pulls on the outside of the hub, can destroy the balancer on some of these engines. Many of the vehicles covered in this guide use a balancer, the outside ring of which is bonded in rubber to the hub. Pulling on the outside will break the bond.

To install:
  1. If removal of the damper was difficult, check the damper inner diameter and the crankshaft outer diameter for corrosion. A small amount of corrosion may be removed using steel wool, then the surface may be lubricated lightly using clean engine oil.
  2.  
  3. Coat the front cover seal contact edge of the damper lightly with clean engine oil, then apply a small amount of RTV sealant to the keyway in the damper hub. Install the damper on the end of the crankshaft (along with the pulley if the share the center retaining bolt), but DO NOT hammer it into position, instead use a damper installation tool to slowly draw the hub into position. If the damper can be positioned far enough over the end of the crankshaft, the damper bolt may be used to draw it into position, but be careful that sufficient threads are in contact to prevent stripping the bolt or crankshaft.
  4.  
  5. Once the damper is fully seated, install and tighten the retaining bolt to specification.
  6.  
  7. If not done earlier, install the pulley and secure using the outer retaining bolts.
  8.  
  9. If removed for access, install the fan assembly.
  10.  
  11. Install the drive belt(s) to the crankshaft pulley.
  12.  
  13. Connect the negative battery cable.
  14.  

Diesel Engine

The 2.2L diesel engine utilizes an exposed crankshaft pulley and a hidden crankshaft timing pulley/damper. The following procedure may be used to remove the exposed crankshaft pulley.

  1. Disconnect the negative battery cable.
  2.  
  3. Loosen and remove the accessory drive belts.
  4.  
  5. Turn the crankshaft pulley to align the timing mark with the engine pointer. This should be done if any further procedures are being performed which might disturb valve timing.
  6.  
  7. Remove the retaining bolts, then remove the crankshaft pulley.
  8.  

To install:
  1. Align and install the crankshaft pulley.
  2.  
  3. Install the retaining bolts, then tighten to 10-17 ft. lbs. (14-23 Nm).
  4.  
  5. Install the accessory drive belts, then properly adjust their tension.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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