BMW Cars 1999-06

Strut (MacPherson Strut) Assembly

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Overhaul (Coil Spring Removal & Installation)



The coil spring is removed along with the shock absorber. The 5 and 7-Series use a "coil over" type shock absorber where the spring is mounted to the shock in one compact unit. Once the shock is removed from the vehicle, the spring can be compressed and separated from the shock absorber.

Ride Level Height Control Suspension
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    The coil spring, shock absorber assembly acts as a strap so the control arm should always be supported.



    Rear seat cushion and back rest
     
    Trim panel over the strut mount
     



    Low pressure switch electrical connection and turn on the ignition
     
    Control rod nut, holding the collar with an 8mm wrench against torque. Don't disconnect the rod at the ball joint.
     

  4.  
  5. Operate the lever on the control switch in the "discharge" direction for about 20 seconds to discharge fluid from the lines.

    Hydraulic line on the strut and turn off the ignition
     
    With the control arm supported, rubber cap and remove the nuts at the top of the strut mount
     
    Lower mounting bolt and lower the spring strut assembly. Remove the assembly from the vehicle.
     

  6.  
  7. Use a spring compressor and compress the spring. Remove the top nut and pull the top mount off. Remove the spring.
  8.  

To install:

  1. Compress the new spring or replace the old spring on the strut. Install the mount and washers. Use a new locknut and tighten to 18 ft. lbs. (25 Nm). Release the spring.
  2.  
  3. Install or connect the following:

    Spring strut. Upper mount nuts: 16 ft. lbs. (21.5 Nm). Loosely install the lower mounting bolt.
     
    Hydraulic line on the strut
     
    Control rod nut, holding the collar with an 8mm wrench against torque
     
    Low pressure switch electrical connection
     

  4.  
  5. With the vehicle lowered to the ground and at standard riding height, tighten the lower mount to 94 ft. lbs. (130 Nm).
  6.  
  7. Install the trim and seat cushions.
  8.  

Standard Suspension


Click image to see an enlarged view

Fig. Rear suspension system-5 Series

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Rear seat cushion and back rest
     
    Trim panel over the strut mount
     
    With the control arm supported, rubber cap and remove the nuts at the top of the strut mount
     
    Lower mounting bolt and lower the spring/shock assembly. Remove the assembly from the vehicle.
     

  4.  
  5. Use a spring compressor and compress the spring. Remove the top nut and pull the top mount off. Remove the spring.
  6.  

To install:

  1. Compress the new spring or replace the old spring on the shock. Install the mount and washers. Use a new locknut and tighten to 18 ft. lbs. (25 Nm). Release the spring.
  2.  
  3. Install the shock. Upper mount nuts: 16 ft. lbs. (21.5 Nm). Loosely install the lower mounting bolt.
  4.  
  5. With the vehicle lowered to the ground and at standard riding height, tighten the lower mount to 94 ft. lbs. (130 Nm).
  6.  
  7. Install the trim and seat cushions.

    Click image to see an enlarged view

    Fig. Exploded view of the shock and coil spring assembly-5 and 7-Series

  8.  

 
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