GM Corsica/Beretta 1988-1996 Repair Guide

Lower Control Arm

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REMOVAL & INSTALLATION



1988-90 Vehicles

See Figure 1

  1. Raise and safely support the front of the vehicle. Remove the wheel and tire assembly.
  2.  
  3. Disconnect the stabilizer bar from the control arm and/or support, as outliner earlier in this section.
  4.  
  5. Separate the ball joint from the steering knuckle using tool J 29330 or equivalent.
  6.  
  7. Remove the 2 control arm-to-support bolts, then remove the control arm from the vehicle.
  8.  
  9. If control arm support bar removal is necessary, unscrew the 6 mounting bolts and remove the support.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: When installing the lower control arm (front suspension support), always follow the proper tightening sequence

To install:
  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the control arm support rail bolts in the sequence shown in the accompanying figure.
  4.  
  5. Have a reputable repair shop check the toe and adjust as necessary.
  6.  

1991-96 Vehicles

See Figure 2

  1. Break the lug nuts loose, then raise and safely support the vehicle.
    1. Place jackstands under the suspension supports.
    2.  
    3. Carefully lower the vehicle slightly so the weight of the vehicle rest on the suspension supports and NOT on the control arms.
    4.  

  2.  
  3. Remove the wheel and tire.
  4.  


WARNING
Care must be taken not to allow the tri-pot joints from being over extended when either end of the shaft is disconnected. Over extension could result in separation of the internal components.

  1. Install modified inner drive axle seal protector J 34754, to prevent possible boot damage.
  2.  
  3. Remove the cotter pin and nut from the ball joint and separate the ball joint from the steering knuckle, using tool J 29330 or equivalent. Discard the cotter pin.
  4.  


WARNING
Failure to use the recommended tool could result in ball joint and seal damage.

  1. On 1991 models equipped with the 2.3L engine only, install overhead engine support, J 28467-A or equivalent and remove the nuts attaching the front engine mount crossmember to the suspension support.
  2.  
  3. Remove the bolts attaching the suspension support to the vehicle.
  4.  
  5. Remove the bolts attaching the control arm to the suspension support.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the lower control arm and suspension support assembly - 1993 shown, other years similar

To install:
  1. Position the control arm and loosely install the bolts attaching the control arm to the suspension support.
  2.  
  3. Place the suspension support into position, guiding the ball joint into the steering knuckle and loosely install the bolts.
  4.  
  5. Install the nuts attaching the stabilizer shaft clamp to the suspension support and tighten to 17 ft. lbs. (23 Nm).
  6.  
  7. On 1991 models equipped with the 2.3L engine only, install the nuts attaching the front engine mount crossmember to the suspension support and tighten to 30 ft. lbs. (40 Nm).
  8.  
  9. Install the nut attaching the ball joint to the steering knuckle and tighten to 26 ft. lbs. (35 Nm) plus a 60 degree rotation for 1991 vehicles, and 41-50 ft. lbs. (55-65 Nm) for 1992-96 vehicles.
  10.  
  11. Install the nuts attaching the stabilizer link to the stabilizer shaft and tighten to 13 ft. lbs. (17 Nm) for except GTZ models and 70 ft. lbs. (95 Nm) for GTZ models.
  12.  
  13. Remove the modified drive axle seal protector.
  14.  
  15. Slightly raise the vehicle and remove the jackstands from under the suspension supports.
  16.  
  17. Install the tire and wheel assembly.
  18.  
  19. On 1991 models equipped with the 2.3L engine, remove the overhead engine support, J 28467-A or equivalent.
  20.  
  21. With the vehicle at curb height, tighten the suspension support attaching bolts, as follows:
    1. For 1991 vehicles, tighten the rear first, center second and front third, to 66 ft. lbs. (90 Nm).
    2.  
    3. For 1992-96 vehicles, tighten the center first to 66 ft. lbs. (90 Nm), front second to 65 ft. lbs. (88 Nm) and rear third to 65 ft. lbs. (88 Nm).
    4.  

  22.  
  23. With the vehicle at curb height tighten the control arm attaching bolts to 44 ft. lbs. (60 Nm) plus an additional 60 degree rotation.
  24.  
  25. Check the front end alignment.
  26.  

CONTROL ARM BUSHING REPLACEMENT



See Figure 3

Lower control arm bushing replacement requires the use of Front Control Arm Horizontal Bushing Service Set (J 29792) and Front Control Arm Rear Vertical Bushing Service Set (J 39971) or equivalent tools.

  1. Remove the lower control arm from the vehicle.
  2.  
  3. Coat the threads of tool J 29792 with an extreme pressure lubricant.
  4.  
  5. Install the bushing removal tools, as shown in the accompanying figure.
  6.  
  7. Remove the control arm bushings.
  8.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of front and rear lower control arm bushing removal

To install:
  1. Install the lower control arm bushings. To make installation easier, coat the outer casing of the new bushing with a suitable lubricant.
  2.  
  3. Install the lower control arm in the vehicle, as outlined earlier in this section.
  4.  

 
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