Chrysler Full-Size Vans 1967-1988 Repair Guide

Belts

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INSPECTION



See Figures 1 through 6

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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



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Fig. Fig. 6: Check for proper belt tension by measuring deflection

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.

Once a year or at 12,000 mile intervals, the tension (and condition) of the alternator, power steering (if so equipped), air conditioning (if so equipped), and Thermactor air pump drive belts should be checked, and, if necessary, adjusted. Loose accessory drive belts can lead to poor engine cooling and diminish alternator, power steering pump, air conditioning compressor or Thermactor air pump output. A belt that is too tight places a severe strain on the water pump, alternator, power steering pump, compressor or air pump bearings.

Replace any belt that is so glazed, worn or stretched that it cannot be tightened sufficiently.

The material used in late model drive belts is such that the belts do not show wear. Replace belts at least every three years.

On vehicles with matched belts, replace both belts. New 1 / 2 ", 3 / 8 " and 15 / 32 " wide belts are to be adjusted to a tension of 140 lbs.; 1 / 4 " wide belts are adjusted to 80 lbs., measured on a belt tension gauge. Any belt that has been operating for a minimum of 10 minutes is considered a used belt. In the first 10 minutes, the belt should stretch to its maximum extent. After 10 minutes, stop the engine and recheck the belt tension. Belt tension for a used belt should be maintained at 110 lbs. (all except 1 / 4 " wide belts) or 60 lbs. ( 1 / 4 " wide belts). If a belt tension gauge is not available, the following procedures may be used.

ADJUSTING



Except Serpentine (Single) Belt

See Figures 7 and 8

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Fig. Fig. 7: To adjust the belt tension on any accessory, loosen its pivot and adjusting bolts



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Fig. Fig. 8: Pull or push on the component until the proper belt tension is reached, then tighten the adjusting and pivot bolts

On models equipped with an electric cooling fan, disconnect the negative battery cable or fan motor wiring harness connector before replacing or adjusting drive belts. The fan may come on, under certain circumstances, even though the ignition is off.

ALTERNATOR (FAN DRIVE) BELT
  1. Position the ruler perpendicular to the drive belt at its longest straight run. Test the tightness of the belt by pressing it firmly with your thumb. The deflection should not exceed 1 / 4 ".
  2.  
  3. If the deflection exceeds 1 / 4 ", loosen the alternator mounting and adjusting arm bolts.
  4.  
  5. Place a 1" open-end or adjustable wrench on the adjusting ridge cast on the body, and pull on the wrench until the proper tension is achieved.
  6.  
  7. Holding the alternator in place to maintain tension, tighten the adjusting arm bolt. Recheck the belt tension. When the belt is properly tensioned, tighten the alternator mounting bolt.
  8.  

POWER STEERING DRIVE BELT-INLINE 6-CYLINDER ENGINE
  1. Hold a ruler perpendicularly to the drive belt at its longest run, test the tightness of the belt by pressing it firmly with your thumb. The deflection should not exceed 1 / 4 ".
  2.  
  3. To adjust the belt tension, loosen the adjusting and mounting bolts on the front face of the steering pump cover plate (hub side).
  4.  
  5. Using a prybar or broom handle on the pump hub, move the power steering pump to ward or away from the engine until the proper tension is reached. Do not pry against the reservoir as it is relatively soft and easily deformed.
  6.  
  7. Holding the pump in place, tighten the adjusting arm bolt and then recheck the belt tension. When the belt is properly tensioned tighten the mounting bolts.
  8.  

POWER STEERING DRIVE BELT-V6 AND V8 MODELS
  1. Position a ruler perpendicular to the drive belt at its longest run. Test the tightness of the belt by pressing it firmly with your thumb. The deflection should be about 1 / 4 ".
  2.  
  3. To adjust the belt tension, loosen the three bolts in the three elongated adjusting slots at the power steering pump attaching bracket.
  4.  
  5. Turn the steering pump drive belt adjusting nut as required until the proper deflection is obtained. Turning the adjusting nut clockwise will increase tension and decrease deflection; counterclockwise will decrease tension and increase deflection.
  6.  
  7. Without disturbing the pump, tighten the three attaching bolts.
  8.  

AIR CONDITIONING COMPRESSOR DRIVE BELT
  1. Position a ruler perpendicular to the drive belt at its longest run. Test the tightness of the belt by pressing it firmly with your thumb. The deflection should not exceed 1 / 4 ".
  2.  
  3. If the engine is equipped with an idler pulley, loosen the idler pulley adjusting bolt, insert a prybar between the pulley and the engine (or in the idler pulley adjusting slot), and adjust the tension accordingly. If the engine is not equipped with an idler pulley, the alternator must be moved to accomplish this adjustment, as outlined under Alternator (Fan Drive) Belt.
  4.  
  5. When the proper tension is reached, tighten the idler pulley adjusting bolt (if so equipped) or the alternator adjusting and mounting bolts.
  6.  

AIR PUMP DRIVE BELT
  1. Position a ruler perpendicular to the drive belt at its longest run. Test the tightness of the belt by pressing it firmly with your thumb. The deflection should be about 1 / 4 ".
  2.  
  3. To adjust the belt tension, loosen the adjusting arm bolt slightly. If necessary, also loosen the mounting belt slightly.
  4.  
  5. Using a prybar or broom handle, pry against the pump rear cover to move the pump toward or away from the engine as necessary.
  6.  


WARNING
Do not pry against the pump housing itself, as damage to the housing may result.

  1. Holding the pump in place, tighten the adjusting arm bolt and recheck the tension. When the belt is properly tensioned, tighten the mounting bolt.
  2.  

Serpentine (Single) Drive Belt Models

See Figure 9



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Fig. Fig. 9: Proper serpentine belt installation

Most models feature a single, wide, ribbed V-belt that drives the water pump, alternator, and (on some models) the air conditioner compressor. To install a new belt, loosen the bracket lockbolt, retract the belt tensioner with a prybar and slide the old belt off of the pulleys. Slip on a new belt, then release the tensioner and tighten the lockbolt. The spring powered tensioner eliminates the need for periodic adjustments.


WARNING
Check to make sure that the V-ribbed belt is located properly in all drive pulleys before applying tensioner pressure.

 
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