Isuzu Cars and Trucks 1981-1991

Lower Control Arm

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REMOVAL AND INSTALLATION
RWD I-Mark
  1. Raise the vehicle and support with jackstands. Remove the front wheels. Lower the control arm onto floor jack or equivalent to release the spring tension before removing the spring.
  2.  
  3. Remove the coil spring as outlined in this Section.
  4.  
  5. Remove the bolts connecting the lower control arm to the crossmember and the body.
  6.  
  7. Install the control arm, spring and knuckle.
  8.  
  9. Tighten all suspension fasteners except for the control arm bushing through bolt.
  10.  
  11. Install the front tire and lower the vehicle.
  12.  


NOTE
When reinstalling front end components, it's best to snug all the bolts and nuts first, then lower the car so that there is weight on the suspension when final torque adjustments are made.

  1. Torque the through bolt when the body is resting on the front suspension to 50 ft. lbs. (67 Nm).
  2.  

I-Mark (FWD)
  1. Raise and support the front of the vehicle.
  2.  
  3. Remove the control arm to tension arm retaining nuts and bolts.
  4.  
  5. Remove the nut/bolt securing the control arm to the body.
  6.  
  7. Remove the control arm and check for cracking or distortion.
  8.  

To install:


NOTE
When reinstalling front end components, it's best to snug all the bolts and nuts first, then lower the car so that there is weight on the suspension when final torque adjustments are made.

  1. Install the control arm and torque the knuckle side nut to 80 ft. lbs. and the body side nut to 40 ft. lbs.
  2.  


NOTE
Raise the control arm to a distance of 386mm (15.2 in.) from the top of the wheel well to the center of the hub. Use 41 ft. lbs. of torque to fasten the control arm to the body and 80 ft. lbs. to secure the control arm to the tension rod. This procedure aligns the bushing arm to the body.

RWD Impulse
  1. Raise the car and support it safely. Remove the front wheel.
  2.  
  3. Remove the brake caliper assembly and wire it up out of the way. Mark the position of the nuts on the front of the strut bar for reassembly (these nuts control caster). Then remove the strut bar.
  4.  
  5. Put the top plate of the coil spring compressor tool J-36567 or equivalent on the top of the upper link. The safety chain is welded to a square projection on the plate. Run on end of the safety chain through the spring, about 3 coils from the top and secure the ends of the chain together. Be sure when setting this up, not to interfere with the brake pipe.
  6.  


CAUTION
During all the following Steps, do not work directly beside the coil spring. Although it is held by the upper and lower links and should not come loose, it is a good idea to stay out its direct line of removal.

  1. Place a floor jack under the lower control arm an apply slight upward pressure. Remove the knuckle and rotor assembly from the lower ball joint. Reinstall the old nuts on the ball joint studs to prevent damage to the threads.
  2.  
  3. Lower the floor jack slowly. The lower link will swing down to its lowest point. The spring ends will be held by the upper and lower seats. Remove the floor jack completely.
  4.  
  5. Set the lower plate of the special coil compressing tool into the coil spring. On the right hand side of the vehicle, put the plate into the 3rd space between the coils counting from the lower link. On the left hand side of the vehicle, put the plate into the 2nd space between the coils counting from the lower control arm. Install the threaded rods, bearing spacers and t-handles to the top of the lower plate.
  6.  


NOTE
Do not allow the spring to angle toward the front or rear of the vehicle.

  1. Press downward and inward on the lower control arm until the spring end is free of the lower seat. If necessary, loosen the lower link pivot bolt to allow more link travel. Remove the lower link bolt, then remove the coil spring together with the lower control arm.
  2.  
  3. After the spring has cleared the lower spring seat, turn the t-handle of the tool equal amounts to release the spring tension.
  4.  
  5. Remove the bushing through bolt and lower control arm.
  6.  

To install:

  1. When installing the upper control arm washers install the small washer on the inboard side of the rear end.
  2.  
  3. Leave the upper and lower control arm link bolts semi-tight as they are to be torqued to specifications after completion of installation with the wheels lowered to the floor.
  4.  
  5. When installing the upper ball joint to the control arm the cutaway portion of the ball joint should be turned outward.
  6.  

  1. Use the following torque book:
  2.  
  3. Upper link retaining bolt: 47 ft. lbs.
  4.  
  5. Upper link ball joint retaining nut: 41 ft. lbs.
  6.  
  7. Lower link retaining bolt: 68 ft. lbs.
  8.  
  9. Lower link ball joint retaining nut: top bolt 76 ft. lbs.; lower bolt 47 ft. lbs.
  10.  
  11. Upper ball joint retaining nut: 39 ft. lbs.
  12.  
  13. Lower ball joint retaining nut: 58 ft. lbs.
  14.  
  15. Stabilizer self lock nut: 19 ft. lbs.
  16.  
  17. Stabilizer bracket bolt: 14 ft. lbs.
  18.  
  19. Strut bar bolt: 72 ft. lbs.
  20.  
  21. Strut bar front nut: 47 ft. lbs.
  22.  
  23. Strut bar rear nut: 114 ft. lbs.
  24.  
  25. Tie rod end nut: 61 ft. lbs.
  26.  
  27. Brake caliper assembly bolt: 36 ft. lbs.
  28.  

FWD Impulse and Stylus
  1. Raise the vehicle and support with jackstands.
  2.  
  3. Disconnect the stabilizer bar from the lower control arm.
  4.  
  5. Remove the pinch bolt from the ball joint.
  6.  
  7. Remove the front and rear LCA bushing bolts and remove the control arm.
  8.  



Click image to see an enlarged view

Fig. Lower control arm FWD Impulse and Stylus

To install:


NOTE
When reinstalling front end components, it's best to snug all the bolts and nuts first, then lower the car so that there is weight on the suspension when final torque adjustments are made.

  1. Install the control arm and bolts. Do NOT tighten the bolts at this time.
  2.  
  3. Install the pinch bolt at the ball joint and connect the stabilizer bar.
  4.  
  5. Install the front wheel and lower the vehicle.
  6.  
  7. Torque the rear LCA bushing bolt to 50 ft. lbs. (68 Nm) and the front bolt to 94 ft. lbs. (128 Nm).
  8.  

All Trucks
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel and tire assembly.
  4.  
  5. Remove the strut bar by removing the frame side bracket and the double nuts, washer and the rubber bushing from the front side of the strut bar. Remove the strut bar-to-lower control arm bolts and remove the bar.
  6.  
  7. Disconnect the stabilizer bar from the lower control arm.
  8.  
  9. Remove the torsion bar.
  10.  
  11. Disconnect the shock absorber from the lower control arm.
  12.  
  13. Remove the lower ball joint from the lower control arm joint.
  14.  
  15. Remove the retaining nut and drive out the bolt holding the lower control arm to the chassis with a soft metal drift. Remove the lower control arm from the vehicle.
  16.  

To install:


NOTE
When reinstalling front end components, it's best to snug all the bolts and nuts first, then lower the car so that there is weight on the suspension when final torque adjustments are made.

  1. To install the lower control arm, install the lower ball joint to the lower control arm. Tighten the retaining nuts to 45 ft. lbs.
  2.  
  3. Mount the lower control arm to the frame. Drive the bolt into position carefully. Use care not to damage the serrated portions. Tighten the nut on the end of the pivot bolt to 135 ft. lbs.
  4.  
  5. Install the stabilizer bar to the lower control arm.
  6.  
  7. Place the washers and bushings on the strut rod and install it through the frame bracket. Install the second set of washers and bushings on the strut rod together with the lockwashers and nut. Leave the nut loose temporarily.
  8.  
  9. Install the strut rod to the lower control arm and tighten the bolts to 45 ft. lbs.
  10.  
  11. Assemble the lower ball joint to the steering knuckle.
  12.  
  13. Install the wheel assembly and lower the vehicle.
  14.  
  15. Tighten the 1st strut bar-to-chassis frame attaching nut to 175 ft. lbs. and the 2nd locknut to 55 ft. lbs. with the vehicle on the ground.
  16.  

 
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