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

Belts

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INSPECTION



See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: There are typically 3 types of accessory drive belts found on vehicles today



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Fig. Fig. 2: An example of a healthy drive belt



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Fig. Fig. 3: Deep cracks in this belt will cause flex, building up heat that will eventually lead to belt failure



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Fig. Fig. 4: The cover of this belt is worn, exposing the critical reinforcing cords to excessive wear



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Fig. Fig. 5: Installing too wide a belt can result in serious belt wear and/or breakage

Inspect the belts for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately. It is best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.

ADJUSTMENT



V-Belts

See Figures 6, 7, 8 and 9



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Fig. Fig. 6: Accessory drive V-belt routing-Pick-up (P'UP) with 1.8L and 1.9L engines



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Fig. Fig. 7: Accessory drive V-belt routing-3.2L engines



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Fig. Fig. 8: Accessory drive V-belt routing-2.3L and 2.6L engines



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Fig. Fig. 9: Measure the tension of the various drive belts at the points shown

Determine belt tension at a point halfway between the pulleys by pressing on the belt with moderate thumb pressure. If the distance between the pulleys, measured at the center of each pulley, is 13-16 in. (33-40cm), the belt should deflect 1 / 2 in. (13mm) at the halfway point of its longest straight run; 1 / 4 in. (6mm) if the distance is 7-12 in. (18-30cm). If the defection is found to be too much or too little, loosen the mounting bolts and make the adjustments.

Before you attempt to adjust any of your engine's belts, you should take an old rag soaked in solvent and clean the mounting bolts of any road grime which has accumulated there. On some of the harder-to-reach bolts, an application of penetrating oil will make them easier to loosen. When you're adjusting belts, especially on 4-cylinder engines with air conditioning and power steering, it would be especially helpful to have a variety of socket extensions and universals to get at those hard-to-reach bolts.

When adjusting the air pump belt, if you are using a prybar, make sure that you pry against the cast iron end cover and not against the aluminum housing. Excessive force on the housing will damage it.

Serpentine Belts

See Figures 10 and 11



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Fig. Fig. 10: Serpentine accessory drive belt routing-2.8L engines



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Fig. Fig. 11: Serpentine accessory drive belt routing-3.1L engine

After 1989, some of the V6 engines are equipped with a serpentine belt and automatic belt tensioner. The tension is maintained by a spring loaded pulley/tensioner. The indicator mark on the moveable portion of the tensioner must be within the limits of the slotted area on the stationary portion of the tensioner. Any reading outside the limits indicates either a defective belt or tensioner.

REMOVAL & INSPECTION



V-Belts and Non-Serpentine Ribbed Belts

See Figure 12



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Fig. Fig. 12: Proper ribbed belt (serpentine and non-serpentine) positioning on the accessory pulleys

ALTERNATOR DRIVE BELT

The alternator is equipped with a pivot bolt, an adjusting bolt and an adjusting side lockbolt. The adjusting bolt is what loosens or tightens the drive belt. The adjusting bolt and locking bolt are on the same side of the alternator, whereas the alternator pivot bolt is opposite these two.

  1. Depending on the location of the alternator in the vehicle, it may be helpful to raise and safely support the vehicle on jackstands.
  2.  
  3. If the alternator drive belt is located behind other belts, they will have to be removed first to facilitate removal of the alternator belt.
  4.  
  5. Loosen the pivot bolt only enough to allow the alternator to move.
  6.  
  7. Loosen the lockbolt, then turn the adjusting bolt to attain the maximum amount of slack in the drive belt.
  8.  
  9. Remove the drive belt from the alternator pulley, then remove it from the crankshaft and cooling fan pulleys.
  10.  

To install:
  1. Position the belt onto the cooling fan and crankshaft pulleys, then position it around the alternator pulley.
  2.  
  3. Turn the adjusting bolt until the proper amount of tension is exhibited by the belt. Tighten the locking bolt and pivot bolt securely.
  4.  
  5. Install any other belts which were removed, then lower the vehicle, if applicable.
  6.  

AIR CONDITIONING COMPRESSOR DRIVE BELT

The A/C compressor drive belt uses a separate adjusting idler pulley assembly to tension the drive belt.

  1. Depending on the location of the A/C compressor (usually toward the bottom of the engine) in the vehicle, it may be helpful to raise and safely support the vehicle on jackstands.
  2.  
  3. If the A/C compressor drive belt is located behind other belts, they will have to be removed first to facilitate removal of the alternator belt.
  4.  

None of the A/C compressor mounting bolts should be loosened or removed-the adjusting idler pulley assembly is solely responsible for keeping the drive belt tight.

  1. Loosen the lockbolt (at the center of the idler pulley), then turn the adjusting bolt to attain the maximum amount of slack in the drive belt.
  2.  
  3. Remove the drive belt from the A/C compressor pulley, then remove it from the crankshaft pulley.
  4.  

To install:
  1. Position the belt onto the crankshaft pulley, then position it around the A/C compressor pulley.
  2.  
  3. Turn the adjusting bolt until the proper amount of tension is exhibited by the belt. Tighten the locking bolt securely.
  4.  
  5. Install any other belts which were removed, then lower the vehicle, if applicable.
  6.  

POWER STEERING PUMP DRIVE BELT

Unlike the other two belts, the power steering pump drive belt usually does not have an adjusting bolt or adjusting idler assembly. If it does, simply use the A/C compressor belt procedure instead.

  1. Depending on the location of the power steering pump in the vehicle, it may be helpful to raise and safely support the vehicle on jackstands.
  2.  
  3. If the power steering pump drive belt is located behind other belts, they will have to be removed first to facilitate removal of the alternator belt.
  4.  
  5. Loosen the pivot bolt only enough to allow movement of the power steering pump.
  6.  
  7. Loosen the sliding bolt (the bolt whose bracket is equipped with a groove to allow adjustment of the pump). The pump should move toward the engine and the drive belt will slacken.
  8.  
  9. Push the pump toward the engine until enough slack is gained to allow removal of the belt from the pump pulley.
  10.  
  11. Remove the drive belt from the steering pump pulley, then remove it from the crankshaft pulley.
  12.  

To install:
  1. Position the belt onto the crankshaft pulley, then position it around the power steering pump pulley.
  2.  
  3. Use a padded prybar to pry against the iron housing of the steering pump. Pry the pump away from the engine until the proper amount of tension is felt in the belt, then tighten the sliding bolt. Having an assistant at hand is helpful when performing this procedure.
  4.  
  5. With the sliding bolt tight, check the belt tension. If the belt tension is incorrect, the sliding bolt must be loosened and the steering pump repositioned with the prybar.
  6.  
  7. Tighten the pivot bolt until secure.
  8.  
  9. Install any other belts which were removed, then lower the vehicle, if applicable.
  10.  

Serpentine Belts

See Figures 12, 13 and 14

  1. It is helpful to note the routing of the serpentine belt before removal, since the routing may differ drastically, depending on the options with which the vehicle is equipped. If the belt is installed incorrectly, this could cause one or more components to be rotated in the opposite direction than intended; this could lead to damage.
  2.  
  3. Install a 1 / 2 in. drive ratchet handle, or breaker bar, into the square hole in the automatic tensioner. Pry the tensioner until the belt becomes loose on the pulleys.
  4.  
  5. While holding the tensioner in that position, slide the serpentine belt off of one or two of the accessory pulleys.
  6.  
  7. Slowly allow the tensioner to move back into its resting position. Do not allow the tensioner to quickly snap back in place; this could damage the automatic tensioner.
  8.  
  9. Remove the breaker bar or ratchet wrench from the tensioner assembly and remove the accessory drive belt from the remaining pulleys.
  10.  



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Fig. Fig. 13: To remove serpentine belts, first swing the tensioner to slacken the belt ...



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Fig. Fig. 14: ... then remove the belt from the various pulleys

To install:
  1. Position the drive belt on all of the pulleys but the one closest to the tensioner.
  2.  
  3. Once again, retract the tensioner using the breaker bar or ratchet wrench and slide the belt over the last pulley. Make sure that the drive belt ribs or grooves are settled into the pulleys completely.
  4.  
  5. Slowly release the tensioner to take up all slack in the drive belt.
  6.  
  7. Remove the breaker bar or ratchet wrench from the tensioner.
  8.  

 
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