Mazda B-Series 1998-06

Mechanical (Belt Driven) Fan

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Removal & Installation



Refer to exploded view illustration before starting this service procedure.


WARNING
The following procedures for removing the fan clutch gives the factory recommended loosening and tightening directions for the fan hub nut. However, it has been our experience that certain aftermarket parts manufacturers have changed this to enable use of universal fit parts. We recommend trying the factory direction first, then, if the nut doesn't seem to be moving, reverse the direction. Placing too much load on the water pump snout will break it.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Position hood latch out of the way.
  6.  
  7. If equipped, remove the upper radiator tie strap.
  8.  
  9. Raise and support the vehicle.
  10.  
  11. Remove the lower center support bolt and the lower fan bolts.
  12.  
  13. Lower the vehicle.
  14.  
  15. Remove the upper center support bolt and the upper center support.
  16.  
  17. Disconnect the LH fan electrical connector.
  18.  
  19. If equipped, disconnect the cooling fan resistor and the cooling fan relay electrical connectors.
  20.  
  21. Remove the LH and RH upper radiator supports.
  22.  
  23. Tilt the radiator forward for clearance.
  24.  
  25. Remove the five bolts and the LH cooling fan.
  26.  
  27. If necessary remove the bolt and disconnect the electrical connector, remove the RH fan.
  28.  
  29. To install, reverse the removal procedure. Tighten all fasteners to 89 inch lbs. (10 Nm).
  30.  

2.3L And 2.5L Engines


Click image to see an enlarged view

Fig. Exploded view of the engine fan for the 2.3L engine

The 2.3L engine does not use a fan hub nut. It is retained by four bolts which also secure the pump pulley to the water pump.

  1. If not equipped with A/C, disconnect the overflow tube from the fan guard, then unbolt and remove the guard.
  2.  
  3. If equipped with A/C, disconnect the overflow tube from the shroud, remove the mounting screws and lift the shroud off the brackets. Place the shroud behind the fan.
  4.  
  5. Remove the 4 clutch/fan assembly-to-pulley screws and remove the clutch/fan assembly. Vehicles equipped with A/C should remove the clutch/fan and shroud together.
  6.  
  7. If necessary, remove the fan-to-clutch bolts to separate the fan from the clutch.
  8.  
  9. Installation is the reverse of removal. Torque the fan-to-clutch screws to 55-70 inch lbs. (6-8 Nm); the fan/clutch assembly-to-pulley bolts to 12-18 ft. lbs. (16-24 Nm).
  10.  

3.0L Engine


Click image to see an enlarged view

Fig. Exploded view of the engine fan for the 2.9L and 3.0L engines

  1. If necessary, remove the air cleaner outlet tube.
  2.  
  3. Using Strap Wrench D79L-6731-A and Fan Clutch Nut Wrench T83T-6312-B, or their equivalents, loosen the large nut attaching the clutch to the water pump hub.
  4.  

According to the manufacturer, the nut uses LH threads and is loosened clockwise.

  1. Remove the two upper fan shroud retaining bolts. If the overflow hose is routed through the fan shroud, remove it from the shroud.
  2.  
  3. Lift up on the fan shroud to disengage the lower mounting clips.
  4.  
  5. Remove the fan/clutch assembly and the fan shroud together.
  6.  
  7. If necessary, remove the fan-to-clutch bolts to separate the fan from the clutch.
  8.  

To install:

  1. Installation is the reverse of removal. Torque the fan-to-clutch bolts to 55-70 inch lbs. (6-8 Nm); the hub nut to 30-100 ft. lbs. (41-135 Nm) for 1991-95 models and 34-46 ft. lbs. (46-63 Nm) for 1996-97 models. Don't forget, the nut uses LH threads and is tightened counterclockwise.
  2.  

4.0L Engine


Click image to see an enlarged view

Fig. Exploded view of the engine fan for the 4.0L engine



Click image to see an enlarged view

Fig. Before attempting to unfasten the engine fan, check the fan shroud for indications of normal or reverse threads



Click image to see an enlarged view

Fig. Remove the air intake tube. You will need these specialized tools to unfasten the fan clutch nut

  1. If necessary, remove the air cleaner outlet tube.
  2.  

According to the manufacturer, the nut uses RH threads and is loosened counterclockwise.

  1. Using Fan Clutch Pulley Holder T84T-6312-C and Fan Clutch Nut Wrench T84T-6312-D, or their equivalents, loosen the large nut attaching the clutch to the water pump hub.
  2.  



Click image to see an enlarged view

Fig. Using the special tools, loosen the fan clutch nut in the direction indicated on the shroud.

Some models have enough room between the shroud and the engine to remove the fan without unbolting the shroud.

  1. Remove the two upper fan shroud retaining bolts. If the overflow hose is routed through the fan shroud, remove it from the shroud.
  2.  
  3. Lift up on the fan shroud to disengage the lower mounting clips.
  4.  



Click image to see an enlarged view

Fig. Remove the fan and clutch assembly from the vehicle

  1. Remove the fan/clutch assembly and the fan shroud together.
  2.  
  3. If necessary, remove the fan-to-clutch bolts to separate the fan from the clutch.
  4.  

To install:

  1. Installation is the reverse of removal. Torque the fan-to-clutch bolts to 55-70 inch lbs. (6-8 Nm); the hub nut to 30-100 ft. lbs. (41-135 Nm) for 1991-95 models and 34-46 ft. lbs. (46-63 Nm) for 1996-97 models. Don't forget, the nut uses RH threads and is tightened clockwise.
  2.  

 
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