Nissan Pick-ups and Pathfinder 1970-1988

Torsion Bars

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REMOVAL & INSTALLATION



See Figure 4

1970-83 2wd Models

See Figures 1, 2 and 3

  1. Raise the front of the vehicle and support it with jackstands. Remove the wheel.
  2.  
  3. On trucks with a catalytic converter, the converter must be removed if the left torsion bar is being removed.
  4.  
  5. Loosen the ride height adjusting nuts at the anchor (rear) end of the torsion bar, allowing the anchor arm to hang down.
  6.  
  7. Remove the dust cover at the rear end of the torsion bar and remove the snapring.
  8.  
  9. Pull the anchor arm rearward and off the torsion bar.
  10.  
  11. Withdraw the torsion bar from the lower control arm and remove it from under the vehicle.
  12.  

To install:
  1. Before installing the torsion bar, apply a light coat of grease to the splines. Install the torsion bar to the lower control arm.
  2.  

The torsion bars are marked on the end with an L(left) or an R(right). The torsion bars must be installed on the same side from which they are removed.

  1. Install the anchor arm on the rear end of the torsion bar. On 1970-71 models, with the lower arm against the rebound bumper, dimension A must be 2.697 in. (68.5mm). On 1972-83 models, dimension A must be:

    1972-76: 0.20-0.60 in. (5-15mm)-standard bed models; 0.59-0.98 in. (15-25mm)-long bed models.
     
    1977: 0.59-0.98 in. (15-25mm)-all models.
     
    1978-83: 0.28-0.67 in. (7-17mm)-all models.
     

  2.  

There are two different methods used for measuring this distance. Be sure you are using the correct illustration for your truck.

  1. Install a new retaining snapring and dust boot to the anchor arm end of the torsion bar.
  2.  

Always use a new snapring. Never reinstall the old one.

  1. On 1970-71 models, tighten the adjusting nut until dimension A is reached: 3.86 in. (98mm) for standard bed models or 3.62 in. (92mm) for long bed models. On all other models, tighten the adjusting nut until the link protrudes above the support bracket; 2.36-2.76 in. (60-70mm) (dimension B ). Again, make sure you are looking at the correct illustration for your truck.
  2.  
  3. Install the wheel and lower the vehicle.
  4.  
  5. Adjust the vehicle ride height with the truck at curb weight (full tank of gas and no passengers). Tighten the locknut to 23-30 ft. lbs.
  6.  



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Fig. Fig. 1: Removing the torsion bar anchor - 1970-79 2wd models



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Fig. Fig. 2: Installing the torsion bar anchor end - 1972-79 2wd models



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Fig. Fig. 3: Installing the torsion bar anchor end - 1970-71 2wd models



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Fig. Fig. 4: Anchor arm adjusting nut - most models similar

1981-83 4wd Models

See Figures 5, 6, 7, 8, 9, 10 and 11

  1. Raise and support the front end on jackstands.
  2.  
  3. Remove the torsion bar spring anchor bolt.
  4.  
  5. Pull the anchor arm out rearward.
  6.  
  7. Pull the torsion bar spring rearward.
  8.  
  9. Remove the torsion bar.
  10.  

To install:
  1. Install the torsion bar to the lower control arm. Tighten the outer bolt to 20-27 ft. lbs. (26-36 Nm) and the inner bolt to 26-33 ft. lbs. (35-45 Nm)
  2.  
  3. Coat the serrated end of the torsion bar with grease and install it into the torque arm.
  4.  
  5. Install the anchor arm to the serrated end of the torsion bar spring and install the anchor arm adjusting bolt. Turn the bolt until the bottom of the nut is about 0.28-0.67 in. (7-17mm) (Dimension A ) from the end of the bolt.
  6.  
  7. Install the dust cover.
  8.  
  9. Adjust the anchor arm position until the distance between the end of the dust cover and the bottom of the nut (Dimension B ) is about 2.36-2.76 in. (60-70mm).
  10.  
  11. Lower the vehicle.
  12.  
  13. Turn the anchor bolt adjusting nut until the center link spindle is 5.28-5.47 in. (134-139mm) above the tension rod attaching bolts. This is dimension H .
  14.  



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Fig. Fig. 5: Torsion bar spring anchor bolt - 1981-83 4wd models



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Fig. Fig. 6: Torsion bar anchor arm - 1981-83 4wd models



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Fig. Fig. 7: Torsion arm-to-link bolts



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Fig. Fig. 8: Torsion bar spring serrated ends. Note that they are marked and not interchangeable



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Fig. Fig. 9: Anchor arm adjusting bolt measurement - 1981-83



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Fig. Fig. 10: Anchor arm position adjustment - 1981-83



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Fig. Fig. 11: Ride height adjustment - 1981-83 4wd models

1984-86 2wd Models (720D Series)

See Figures 12, 13, 14, 15,16 and 17

  1. Block the rear wheels and raise and support the front end with jackstands under the frame rails.
  2.  
  3. Remove the torsion bar spring anchor bolt.
  4.  
  5. Remove the dust cover and remove the snapring from the anchor arm.
  6.  
  7. Pull the anchor arm off toward the rear.
  8.  
  9. Pull the torsion bar out toward the rear.
  10.  
  11. Remove the torsion bar spring torque arm.
  12.  

To install:
  1. Check the torsion bars for wear, cracks or other damage. Replace them if they are suspect.
  2.  
  3. Install the torque arm on the lower link (control arm). Tighten the outer side to 20-27 ft. lbs. (26-36 Nm); the inner side to 26-33 ft. lbs. (35-45 Nm).
  4.  
  5. Install the snapring and dust cover on the torsion bar.
  6.  
  7. Coat the splines on the torsion bar with chassis lube and install it in the torque arm. The torsion bars are marked L and R and are not interchangeable.
  8.  
  9. Place the lower link in position so that clearance between it and the rebound bumper is
  10.  
  11. On 1984 models, install the anchor arm so that dimension G in the illustration is:

    Z20 and Z24 engines: left side-4.33-4.72 in. (110-120mm); right side-5.12-5.51 in. (130-140mm).
     
    SD25 engines: left side-4.53-4.92 in. (115-125mm); right side-5.31-5.71 in. 135-145mm).
     

  12.  
  13. On 1985-86 models, install the anchor arm bolt through the seat so that the distance between the seat and the upper end of the bolt is 1.46 in. (37mm).
  14.  
  15. Temporarily tighten the anchor arm bolt so that dimension H in the illustration is: 2.72 in. (69mm) on the left side and 2.83 in. (72mm) on the right side for 1984 models. Or 2.36-2.76 in. (60-70mm) for both sides on 1985-86 models.
  16.  
  17. Install the snapring on the anchor arm, turning it to make sure that it is completely in the groove.
  18.  
  19. Install the dust cover.
  20.  
  21. Lower the truck so that it is resting on its wheels. Turn the anchor bolt adjusting nut so that dimension H in the illustration is: 4.65-4.80 in. (118-122mm) on regular cab models and 4.45-4.61 in. (113-117mm) on the King Cab models in 1984. On all 1985-86 models, H should be 5.04-5.20 in. (128-132mm). Torque the adjusting nut to 22-30 ft. lbs. (30-40 Nm).
  22.  

Dimension H can be calculated by subtracting dimension B from dimension A.



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Fig. Fig. 12: Removing the torsion bar anchor bolt - 1984-86 2wd models (720D series)



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Fig. Fig. 13: Positioning lower control arm



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Fig. Fig. 14: Anchor arm installation - 1984 2wd models



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Fig. Fig. 15: Anchor arm installation - 1985-86 2wd models (720D series)



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Fig. Fig. 16: Anchor arm adjustment - 1984-86 (720D series)



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Fig. Fig. 17: Ride height adjustment - 1984-86 (720D series)

1984-86 4wd Models (720D Series)
  1. Raise and support the front end with jackstands under the frame rails.
  2.  
  3. Remove the torsion bar anchor bolt.
  4.  
  5. Pull the anchor arm out toward the rear.
  6.  
  7. Pull the torsion bar out toward the rear.
  8.  
  9. Remove the torque arm.
  10.  

To install:
  1. Check the torsion bar for signs of wear and/or damage and replace as necessary.
  2.  
  3. Install the torque arm to the lower link (control arm) and tighten the bolts to 66-87 ft. lbs. (89-118 Nm).
  4.  
  5. Coat the spines on the inner end of the torsion bar with chassis lube and install it into the torque arm.
  6.  

The torsion bars are marked L and R. They are not interchangeable.

  1. Using a floor jack, position the lower link so that there is 0 clearance between it and the rebound bumper.
  2.  
  3. Install the anchor arm so that dimension G is:

    1984 Z20 and Z24 engines: left side-4.33-4.72 in. (110-120mm); right side-5.12-5.51 in. (130-140mm).
     
    1984 SD25 engines: left side-4.53-4.92 in. (115-125mm); right side-5.31-5.71 in. (135-145mm).
     
    1985-86 models: left side-3.74 in. (95mm); right side-4.33 in. (110mm).
     

  4.  
  5. Temporarily tighten the anchor arm bolt so that dimension H is:

    1984 models: left side-2.72 in. (69mm); right side-2.83 in. (72mm).
     
    1985-86 models: left side-3.50 in. (89mm); right side-3.86 in. (98mm).
     

  6.  
  7. Lower the truck so that it is resting on its wheels. Adjust the anchor bolt so that dimension H :

    1984 models: 1.54-1.69 in. (39-43mm) for King Cab models and 1.73-1.89 in. (44-48mm) for regular cab models.
     
    1985-86 models: 2.09-2.24 in. (53-57mm).
     

  8.  

Dimension H can be calculated by subtracting dimension B from dimension A.

1986-88 2wd Models (D21D Series)

See Figures 18, 19, 20, 21, 22, 23 and 24

  1. Block the rear wheels and raise and support the front end with jackstands under the frame rails.
  2.  
  3. Remove the torsion bar spring adjusting nut.
  4.  
  5. Remove the dust cover and remove the snapring from the anchor arm.
  6.  
  7. Pull the anchor arm off toward the rear and then remove the torsion bar spring.
  8.  
  9. Remove the torque arm.
  10.  

To install:
  1. Check the torsion bars for wear, cracks or other damage. Replace them if they are suspect.
  2.  
  3. Install the torque arm on the lower link (control arm) and tighten the bolts to 37-50 ft. lbs. (50-68 Nm).
  4.  
  5. Install the snapring and dust cover on the torsion bar.
  6.  
  7. Coat the splines on the inner end of the torsion bar with chassis lube and install it into the torque arm. The torsion bars are marked L and R and are not interchangeable.
  8.  
  9. Position a floor jack under the lower link and raise it so that clearance between the link and the rebound bumper is 0.
  10.  
  11. Install the anchor arm so that dimension G in the illustration is 0.24-0.71 in. (6-18mm).
  12.  
  13. Install the snapring to the anchor arm and dust cover. Make sure that the snapring is properly installed in the groove of the anchor arm.
  14.  
  15. Tighten the anchor arm adjusting nut until dimension L is 1.38 in. (35mm) for Heavy Duty, Cab/Chassis and STD models; or 1.93 in. (49mm) for all other models.
  16.  
  17. Lower the truck so that it is resting on its wheels and bounce it several times to set the suspension. Turn the anchor bolt adjusting nut so that dimension H in the illustration is 4.37-4.53 in. (111-115mm) on 1986-87 models; or 4.25-4.65 in. (108-118mm) on 1988 models.
  18.  



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Fig. Fig. 18: Removing the torsion bar anchor bolt-1986-88 2wd models (D21D series)



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Fig. Fig. 19: Anchor arm installation - 1986-88 2wd models (D21D series)



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Fig. Fig. 20: Anchor arm installation - 1986-88 4wd models (D21D series)



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Fig. Fig. 21: Tighten the anchor arm adjusting nut - 1986-88 2wd models (D21D series)



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Fig. Fig. 22: Tighten the anchor arm adjusting nut - 1986-88 4wd models (D21D series)



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Fig. Fig. 23: Ride height adjustment - 1986-88 2wd models (D21D series)



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Fig. Fig. 24: Ride height adjustment - 1986-88 4wd models (D21D series)

1986-88 4wd Models (D21D Series)
  1. Block the rear wheels and raise and support the front end with jackstands under the frame rails.
  2.  
  3. Remove the torsion bar spring adjusting nut.
  4.  
  5. Pull back the dust boot and remove the anchor arm snapring.
  6.  
  7. Remove the torque arm attaching nuts, then withdraw the torsion bar spring forward with the torque arm still attached.
  8.  

To install:
  1. Check the torsion bar for wear, cracks or other damage. Replace them if they are suspect.
  2.  
  3. Coat the splines on the torsion bar with chassis lube and install it in the anchor arm. The torsion bars are marked L and R and are not interchangeable.
  4.  
  5. Position a floor jack under the lower link (control arm) and raise it so that the clearance between the link and the rebound bumper is 1.97-2.36 in. (50-60mm).
  6.  
  7. Install the snapring on the anchor arm and pull the dust boot over it.
  8.  
  9. Tighten the anchor arm adjusting nut until dimension L is 3.03 in. (77mm).
  10.  
  11. Lower the truck so that it is resting on its wheels and bounce it several times to set the suspension. Turn the anchor bolt adjusting nut so that dimension H is 1.73-1.89 in. (44-48mm) on 1986-87 models; or 1.61-2.01 in. (41-51mm) on 1988 models.
  12.  

 
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