Mazda Trucks 1987-1993 Repair Guide

Belts

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INSPECTION



See Figures 1 through 5

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.



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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

ADJUSTMENT



The drive belts should be checked for wear and tension as indicted in the Maintenance Interval charts. If the belt is worn, cracked or frayed, replace it with a new one. To check the belt tension:

Some models may use an adjusting bolt on either the idler pulley (a pulley which is not directly associated with any of the accessories) or on the power steering pump itself. This bolt makes adjustment much easier because you don't have to hold the accessory under a great deal of tension while tightening mounting bolts.

On models where the idler pulley has a lockbolt at its center, simply loosen the lockbolt and then turn the adjusting bolt clockwise to increase belt tension or counterclockwise to decrease it or remove the belt. Just don't forget to retighten the lockbolt when tension is correct, or vibration may cause it be lost. Recheck the tension with the lockbolt tightened and readjust if necessary.

On models with the 4 ridge or 5 ridge ribbed type V-belt driving both the air conditioner and power steering pump, belt tension is much greater. With a used belt, deflection should only be about 1 / 4 in.

V-Belts
  1. Apply thumb pressure (about 22 lbs.) to the fan belt midway between the pulleys and check the deflection. I should be approximately 3 / 8 in. for new belts and 1 / 2 in. for used belts.
  2.  
  3. To adjust the tension, loosen the alternator mounting bolt and adjusting bolt.
  4.  
  5. Move the alternator in the direction necessary to loosen or tighten the tension.
  6.  
  7. Tighten the mounting and adjusting bolts and recheck the tension.
  8.  

Navajo

The Navajo uses a single accessory drive belt that is tensioned by a spring loaded tensioner, no adjustment is necessary. While there is no adjusting with the automatic tensioner and Poly-V belt used, it may be necessary to check the belt tension if squealing or excessive belt wear is noticed. If deflection is greater than 1 / 4 in., the belt probably should be replaced. Before replacement, however, check the accessory component mountings for looseness and check the condition of the automatic tensioner. Repair or replace parts as necessary.

REMOVAL & INSTALLATION



Pick-up and MPV

See Figure 6



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Fig. Fig. 6: (A) Alternator belt, (B) Power steering pump belt, (C) A/C compressor belt-MPV with 3.0L engine shown

POWER STEERING PUMP BELT

See Figures 7, 8 and 9

  1. Turn the ignition OFF and remove the key. Allow the engine to cool.
  2.  
  3. Loosen the idler pulley locknut to release the drive belt tension.
  4.  
  5. Remove the power steering belt.
  6.  



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Fig. Fig. 7: Using a boxwrench, loosen the power steering pump belt idler pulley lockbolt



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Fig. Fig. 8: Loosen the power steering pump belt by turning the idler pulley adjusting bolt



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Fig. Fig. 9: Remove the power steering pump belt

To install:
  1. Install the power steering belt and make sure it is correctly seated on the pulleys.
  2.  
  3. Adjust the power steering belt tension/deflection by turning the adjusting bolt. A new belt should deflect 0.26-0.28 in. (6.6-7.2mm) and a used belt should deflect 0.28-0.31 in. (7-8mm).
  4.  
  5. Tighten the idler pulley locknut to 27-38 ft. lbs. (37-52 Nm).
  6.  
  7. Run the engine for 5 minutes and then recheck the belt deflection.
  8.  

ALTERNATOR BELT

See Figures 10, 11, 12 and 13

  1. Turn the ignition OFF and remove the key. Allow the engine to cool.
  2.  
  3. Remove the power steering pump belt and A/C compressor belt, if necessary.
  4.  
  5. Loosen the alternator upper bracket adjusting bolt.
  6.  
  7. Loosen the lower through-bolt.
  8.  
  9. Remove the alternator belt.
  10.  



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Fig. Fig. 10: To access the alternator pivot bolt, you must first remove the power steering pump pulley



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Fig. Fig. 11: Loosen the alternator pivot bolt located just below the alternator assembly



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Fig. Fig. 12: Loosen the alternator adjuster lockbolt (A), then turn the adjustment nut (B) to loosen the slack on the belt ...



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Fig. Fig. 13: ... then remove the alternator belt

To install:
  1. Install the alternator belt and make sure it is correctly seated on the pulleys.
  2.  
  3. Turn the adjusting bolt to adjust the belt deflection. New belts should deflect 0.39-0.47 in. (10-12mm). Used belts should deflect 0.43-0.51 in. (11-13mm).
  4.  
  5. Once the correct deflection has been reached, tighten the upper bracket lock bolt to 14-19 ft. lbs. (19-25 Nm).
  6.  
  7. Tighten the lower through-bolt to 28-38 ft. lbs. (38-51 Nm).
  8.  
  9. Install and tension the power steering pump belt and A/C compressor belt, if necessary.
  10.  
  11. Run the engine for 5 minutes and then recheck the belt deflection.
  12.  

A/C COMPRESSOR BELT

See Figures 14, 15 and 16

  1. Turn the ignition OFF and remove the key. Allow the engine to cool.
  2.  
  3. Remove the power steering pump belt and alternator belt, if necessary.
  4.  
  5. Loosen the tensioner bracket adjusting bolt and tensioner pulley center locknut to release the drive belt tension.
  6.  
  7. Remove the A/C belt.
  8.  



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Fig. Fig. 14: Loosen the A/C compressor belt idler pulley lockbolt using an open end wrench



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Fig. Fig. 15: Loosen the A/C compressor belt idler pulley adjusting bolt just enough to be able to remove the belt



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Fig. Fig. 16: Remove the A/C compressor belt

To install:
  1. Install the A/C belt, and make sure it is correctly seated on the pulleys.
  2.  
  3. Adjust the A/C belt tension/deflection by turning the tensioner bracket adjusting bolt. A new belt should deflect 0.33-0.39 in. (8.5-10mm), and a used belt should deflect 0.39-0.45 in. (10-11.5mm).
  4.  
  5. Tighten the tensioner pulley center locknut to 27-38 ft. lbs. (37-52 Nm).
  6.  
  7. Install and tension the alternator belt, if necessary, and the power steering pump belt.
  8.  
  9. Run the engine for 5 minutes and then recheck the belt deflection.
  10.  

Navajo

See Figure 17

All Navajo and B Series Pick-up engines utilize one wide-ribbed V-belt to drive the engine accessories such as the water pump, alternator, air conditioner compressor, air pump, etc. Because this belt uses a spring loaded tensioner for adjustment, belt replacement tends to be somewhat easier than on engines where accessories are pivoted and bolted in place for tension adjustment, such as the MPV. Basically, all belt replacement involves is to pivot the tensioner to loosen the belt, then slide the belt off of the pulleys. The two most important points are to pay CLOSE attention to the proper belt routing (since serpentine belts tend to be "snaked'' all different ways through the pulleys) and to make sure the V-ribs are properly seated in all the pulleys.



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Fig. Fig. 17: Accessory location and drive belt routing-Navajo

 
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