Mazda Trucks 1987-1993 Repair Guide

Freewheel Mechanism

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The Remote Freewheel Mechanism on 1989-93 4WD B Series pickup and the Automatic Freewheel Mechanism on 1990-93 4WD MPV are used in place of automatic locking hubs.

REMOVAL & INSTALLATION



See Figures 1, 2 and 3



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Fig. Fig. 1: Exploded view of the components to the automatic freewheel mechanism-MPV



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Fig. Fig. 2: MPV front differential freewheel vacuum hose installation



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Fig. Fig. 3: Pickup 4WD remote freewheel mechanism

  1. Disconnect the negative battery cable. Raise and safely support the vehicle. Remove the left front wheel and tire assembly.
  2.  
  3. Drain the fluid from the front differential.
  4.  
  5. Remove the left side halfshaft assembly.
  6.  
  7. Tag and disconnect the vacuum hoses and electrical connector from the control box assembly.
  8.  
  9. Remove and discard the snap pin at the control box assembly.
  10.  
  11. Remove the attaching bolts and remove the joint shaft assembly.
  12.  
  13. Remove the attaching bolts and remove the control box assembly.
  14.  
  15. Remove the gear sleeve from the side of the differential, if necessary.
  16.  
  17. If necessary, remove the output shaft from the differential using a slide hammer.
  18.  

To install:
  1. If removed, install a new clip on the end of the output shaft and install in the differential. Install the gear sleeve, if removed.
  2.  
  3. Install the control box and tighten the attaching bolts to 17-20 ft. lbs. (23-26 Nm).
  4.  
  5. Install the joint shaft assembly and tighten the attaching bolts to 27-40 ft. lbs. (36-54 Nm). On MPV, install the attaching nut and tighten to 49-72 ft. lbs. (67-97 Nm).
  6.  
  7. Install a new snap pin at the control box assembly. The remaining assembly is the reverse of removal.
  8.  

 
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