Nissan Z - ZX 1970-1988 Repair Guide

Accessory Belts

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INSPECTION



See Figures 1, 2, 3, 4, 5 and 6

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 always best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.

Check the belts driving the fan, air pump, air conditioning compressor and alternator for cracks, fraying, wear and tension every 6,000 miles (9,700 km). It is recommended that the belts be replaced every 24 months or 24,000 miles (15,000 km). Belt deflection at the midpoint of the longest span between pulleys should not be more than 0.44 in. (1.1cm) with 22 lbs. (9 Nm) of pressure applied to the belt.



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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: Belt tension check-1970-83 model shown

REMOVAL & INSTALLATION



See Figures 7, 8, 9, 10, 11, 12, 13, 14 and 15



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Fig. Fig. 7: Loosen the adjuster bolt



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Fig. Fig. 8: After the retainer bolt has been loosened, push the component to slacken the belt



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Fig. Fig. 9: Slip the belt off the pulleys



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Fig. Fig. 10: With the belt installed on the pulleys, pull the component outward



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Fig. Fig. 11: Belt tension points-1970-83 models



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Fig. Fig. 12: Belt tension points-1984-88 models



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Fig. Fig. 13: Slacken the idler pulley by loosening the bolt in the center of the pulley and the adjuster bolt at the top of the bracket-1987 100 ZX shown



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Fig. Fig. 14: Loosen the retainer bolt between the alternator and the lower bracket



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Fig. Fig. 15: Loosen the adjuster nut on the lower bracket

  1. Before removing the belt, orient yourself with the V-belt routing on the engine pulleys.
  2.  
  3. Loosen the adjuster bolt.
  4.  
  5. Loosen the retaining bolt securing the alternator or, if equipped, the power steering pump.
  6.  
  7. Remove the belt.
  8.  

To install:
  1. Position the belt over the pulleys, making sure the belt is seated evenly in the center groove.
  2.  
  3. To adjust the tension on all components except the air conditioning compressor, power steering pump and some late model air pumps, loosen the pivot and mounting bolts of the component which the belt is driving, then, using a wooden lever, pry the component toward or away from the engine until the proper tension is achieved.
  4.  


WARNING
An overtightened belt will wear out the pulley bearings on the assorted components.

  1. Tighten the retainer and adjusting bolts.
  2.  
  3. If a new belt is installed, recheck the tension after driving about 1,000 miles (1,600 km).
  4.  

 
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