Volvo Coupes/Sedans/Wagons 1970-1989 Repair Guide

Multi-link Rear Suspension

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1988-89 760 and 780

See Figure 1

Multi-link suspensions require alignment any time the suspension components are disassembled. Position of components is critical as are torque values when retightening bolts.



Click image to see an enlarged view

Fig. Fig. 1: The Volvo Multi-link suspension with components labeled

Component Removal & Installation
SPRING, SHOCK ABSORBER AND SUPPORT ARM

See Figure 2

It is important that the car be parked in a straight-ahead position with no side loadings in the suspension. After the car is in the work area, roll it forward and backwards 6-8 ft. (1.8-2.5 meters) and make sure the front and rear wheels point straight.

  1. Safely elevate and support both ends of the car. Make sure the front supports are placed as far forward as possible. Check that the rear supports will not interfere with the support arm.
  2.  
  3. Remove the wheels. Loosen and remove the bolts holding the protective cover (guard) to the arm and remove the guard.
  4.  
  5. At the front of the arm, remove the two retaining bolts which hold the bracket (for the support arm) to the frame. Don't attempt to remove the through bolt (eye bolt).
  6.  
  7. Remove the retaining bolt at the rear of the support arm.
  8.  
  9. Separate the rear end of the support arm from the wheel bearing housing.
  10.  
  11. Using either Volvo tool 5972 or two floor jacks, support the arm at the front and rear ends. Elevate the jacks just enough to relieve the tension on the shock absorber.
  12.  



Click image to see an enlarged view

Fig. Fig. 2: Support the lower arm when working on vehicles equipped with Multi-link suspensions-Volvo special tool shown

  1. Remove the retaining bolt at the top of the shock abosorber.
  2.  
  3. Lower the jacks slowly; the arm will come free with the spring and shock attached.
  4.  
  5. Remove the spring and the upper and lower rubber seats. Unbolt the shock absorber from the arm. If the support arm is to be replaced, unbolt and remove the bracket at the front of the arm. Take note of the relationship between the bracket and the arm; the bracket correctly mounts one way only.
  6.  

To install:
  1. Install the support arm bracket in the correct position and tighten the nut to 91 ft.lbs PLUS 120° of rotation.
  2.  
  3. Install the shock absorber on the arm and tighten the bottom mount to 41 ft. lbs. (55 Nm).
  4.  
  5. Install the bottom spring seat on the support arm. Take care to properly locate the grooves in the seat.
  6.  
  7. Install the spring and the top rubber seat. Place the assembled support arm on the jacks and raise into position.
  8.  
  9. Gently raise the jacks and compress the spring until the shock absorber is in the correct position. The shock may be held in place temporarily with a drift in the hole. Insert the bolt and tighten it to 62 ft. lbs. (84 Nm).
  10.  
  11. Reinstall the mounting bolts at the front of the support arm bracket. Tighten the bolts to 35 ft. lbs. (47 Nm). and the large nut to 51 ft. lbs. (69 Nm).
  12.  
  13. At the rear of the support arm, tap the arm into place on the wheel bearing housing. Tighten the bolt to 44 ft. lbs. (60 Nm) PLUS 90° of rotation. Do not overtighten this fitting.
  14.  
  15. Reinstall the protective cover on the control arm. Install the wheel.
  16.  
  17. Lower the car to the ground and final tighten the lugs to 62 ft. lbs. (84 Nm).
  18.  
  19. Have the rear alignment checked and adjusted if necessary.
  20.  

UPPER CONTROL ARM

CAUTION
The following procedure requires removal of the brakes. Brake pads and shoes may contain asbestos, which has been determined to a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling and dust from brake surfaces! When cleaning brakes, use commercially available brake cleaning fluids.

  1. Safely elevate and support both ends of the car. Make sure the front supports are placed as far forward as possible. Check that the rear supports will not interfere with the support arm.
  2.  
  3. Remove the wheels. Remove the brake caliper and tie it with wire out of the way. Do not allow it to hang by its hose.
  4.  
  5. Remove the bolt holding the lower support arm to the wheel bearing housing and tap the support arm loose.
  6.  
  7. Remove the nut and bolt holding the lower control arm (intermediate arm) to the wheel bearing housing.
  8.  
  9. Remove the bolt attaching the track rod to the wheel bearing housing. Use a small bearing puller and a long 12mm bolt to disconnect the track rod.
  10.  
  11. Remove the nut which holds the upper control arm to the wheel bearing housing. Collect and note the location of the spacers between the upper control arm and the bearing housing. They are alignment shims and must be reinstalled properly.
  12.  
  13. At the rear of the upper control arm, remove the nut holding it to the rear axle member (support).
  14.  
  15. At the front of the upper control arm, remove the nut and bolt which holds it to the rear axle member.
  16.  
  17. Use a pair of adjustable pliers to remove the control arm from the car.
  18.  

To install:
  1. Install the new arm and install the nuts and bolts holding it to the rear axle member. Install both the front and rear mounts.
  2.  
  3. Install the spacers at the wheel bearing housing, position the arm and install the nut holding the arm to the housing.
  4.  
  5. Inboard, (at the rear axle support) tighten the rearmost nut to 62 ft. lbs. (84 Nm). Tighten the front nut and bolt to 51 ft. lbs. (69 Nm) PLUS 60° of rotation.
  6.  
  7. Pull the top of the wheel bearing housing outwards (away from the center of the car). This is essential for correct wheel alignment.
  8.  
  9. Tighten the upper control arm nut (at the bearing housing) to 84 ft. lbs. (114 Nm).
  10.  
  11. Pull the wheel bearing housing outward and install the lower control arm with its bolt and nut, but do not tighten it.
  12.  
  13. Pull the wheel bearing housing inwards (towards the center of the car). This is essential for correct wheel alignment.
  14.  
  15. Tighten the control arm nut to 37 ft. lbs. (50 Nm) PLUS 90° of rotation.
  16.  
  17. Reinstall the support arm; tighten its mount to 44 ft. lbs. (60 Nm) PLUS 90° of rotation.
  18.  
  19. Install the track rod and tighten to 62 ft. lbs. (84 Nm).
  20.  
  21. Install the brake caliper, tightening its mounting bolts to 44 ft. lbs. (60 Nm).
  22.  
  23. Install the wheel. Lower the car to the ground and tighten the wheel lugs to 62 ft. lbs. (84 Nm).
  24.  
  25. Have the rear alignment checked and adjusted if necessary.
  26.  

 
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