Lexus GS, SC 1998-06

Strut (MacPherson Strut) Assembly

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Removal & Installation



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

    Front trunk compartment trim cover
     
    Wheel(s)
     
    Brake caliper support bracket from the rear axle carrier by removing the 2 bolts. Leave the brake line connected and position it out of the way.
     
    Nut and disconnect the sway bar link from the lower control arm
     
    Nut and bolt on the lower end of the strut
     
    3 upper nuts and lift out the strut. Do NOT remove the center nut
     

  4.  
  5. Compress the coil spring.
  6.  
  7. Secure the upper support and remove the strut rod retaining nut.
  8.  
  9. Remove or disconnect the following:

    Upper suspension support
     
    Upper insulator
     
    Coil spring
     
    Spring bumper
     
    Lower insulator
     

  10.  
  11. If discarding the strut, perform the following:
    1. Fully extend the strut rod.
    2.  
    3. Drill a hole in the side of the strut to drain the gas inside
    4.  

  12.  


CAUTION
The gas coming out is harmless, but be careful of chips that may fly up while drilling.

To install:

  1. Install or connect the following:

    Lower insulator to the strut
     
    Spring bumper to the strut piston rod
     
    Compressed coil spring. Position the coil spring with the end butted against the gap in the lower seat.
     
    Upper insulator and suspension support
     
    Upper suspension support and tighten a new strut piston rod nut to 20 ft. lbs. (27 Nm)
     

  2.  
  3. Remove the spring compressor.
  4.  
  5. Install or connect the following:

    Strut to the vehicle and tighten the 3 upper mounting nuts to 14 ft. lbs. (20 Nm). Install the cap.
     
    And tighten the lower strut bolt and nut to 101 ft. lbs. (137 Nm)
     
    Sway bar link to the lower control arm. Tighten the nut to 33 ft. lbs. (44 Nm).
     
    Brake caliper to the rear axle carrier by installing the 2 bolts. Tighten the bolts to 77 ft. lbs. (104 Nm).
     
    Wheel(s)
     
    Trunk compartment cover trim
     

  6.  
  7. Check and adjust the vehicle alignment as necessary.
  8.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove the corresponding rear wheel(s).
  4.  
  5. Remove the luggage compartment trim front cover.
  6.  
  7. Remove the rear fender apron seal.
  8.  
  9. Remove the rear lower suspension arm:
    1. Remove 2 bolts, nuts and the No. 1 lower suspension arm (trailing arm).
    2.  
    3. Remove the bolt and nuts and disconnect the stabilizer bar link (and height control link, if equipped) from the No. 2 lower suspension arm.
    4.  
    5. Remove the bolt and nut and disconnect the strut from the No. 2 lower suspension arm.
    6.  
    7. Place matchmarks on the adjusting cam and on the No. 2 lower suspension arm.
    8.  
    9. Remove the nut and adjusting cams.
    10.  
    11. Remove the bolt, nut and washer and the No. 2 lower suspension arm.
    12.  

  10.  
  11. Remove the 3 upper retaining nuts. Loosen, but Do NOT remove the center stud nut.
  12.  
  13. Remove the lower strut mounting bolt.
  14.  
  15. Remove the strut assembly, with the coil spring.
  16.  
  17. Compress the coil spring in a suitable spring compressor.
  18.  


NOTE
Do NOT remove these items with an impact wrench; it will damage the spring compressor.

  1. Remove or disconnect the following:

    Suspension support nut
     
    Washer
     
    2 cushions
     
    Collar
     
    Suspension support
     
    Upper insulator
     
    Lower cup
     
    Spring bumper
     

  2.  
  3. Carefully release the spring compressor and remove the coil spring.
  4.  
  5. If the shock absorber is being replaced, fully extend the shock absorber rod and drill a hole to discharge the gas from the cylinder. Drill this hole about 5-8 in. (130-185mm) from lower mounting bolt hole.
  6.  

To install:

  1. With a new shock absorber in place, install the suspension support and compress the coil spring.
  2.  
  3. With a non-impact wrench, install the coil spring to the shock absorber, fitting the lower end of the spring into the recent of the spring seat on the shock absorber.
  4.  
  5. Install the spring bumper, lower cup, cushion, collar, upper insulator, suspension support, cushion and washer onto the shock absorber. Temporarily tighten a new nut.
  6.  
  7. Rotate the suspension support so the rod and one of the bolts on the suspension support are aligned with the lower shock mounting hole such that while the lower mounting bolt hole is in proper position, the 3 studs on the top of the strut assembly will align with the holes in the body.
  8.  
  9. Carefully remove the spring compressor.
  10.  
  11. Install the strut assembly into the vehicle. Torque the 2 bolts on top of the coil spring to 13 ft. lbs. (18 Nm), the 3 nuts on the top mounting studs to 47 ft. lbs. (64 Nm), and the nut in the center of the upper strut mounting to 20 ft. lbs. (27 Nm).
  12.  
  13. Install the bolt, nut and washer and the No. 2 lower suspension arm. Torque bolt to 81 ft. lbs. (110 Nm).
  14.  
  15. Position both adjusting cams, referencing the matchmarks made during removal. Install and torque the retaining nuts to 81 ft. lbs. (110 Nm).
  16.  
  17. Install the strut assembly lower mounting bolt to the No. 2 lower suspension arm. Torque the nut to 81 ft. lbs. (110 Nm).
  18.  
  19. Install the stabilizer bar link (and height control link, if equipped) to the No. 2 lower suspension arm. Torque the bolt and nut to 22 ft. lbs. (30 Nm).
  20.  
  21. Install the No. 1 lower suspension arm (trailing arm) and torque the bolts and nuts to 55 ft. lbs. (75 Nm).
  22.  
  23. Install the rear fender apron seal.
  24.  
  25. Install the luggage compartment trim front cover.
  26.  
  27. Install the rear wheel(s). Torque the wheel nuts to 76 ft. lbs. (103 Nm).
  28.  



Click image to see an enlarged view

Fig. Exploded view of trunk access for rear struts-SC 430



Click image to see an enlarged view

Fig. Exploded view of rear strut assembly-SC 430

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Raise the rear of the vehicle and support it with safety stands.
  4.  
  5. Remove or disconnect the following:

    Tonneau stoppers
     
    Rear floor finish plate
     
    Luggage compartment floor mat
     
    Luggage compartment trim covers
     
    Spare wheel cover
     
    Tool box cover
     
    Rear wheels
     

  6.  
  7. Remove rear suspension arm assembly
  8.  


NOTE
Match mark the camber adjustment cams for proper installation

  1. Remove or disconnect the following:

    Loosen nuts on rear suspension arm. Do NOT remove
     
    Stabilizer link and height control link
     
    shock absorber from suspension arm
     
    suspension arm from axle carrier and suspension member
     
    Loosen center nut of suspension support. Do NOT remove.
     
    3 nuts holding the suspension support assembly
     
    2 bolts holding the assembly to the frame
     

  2.  
  3. Remove the shock from the assembly
  4.  


WARNING
Using a suitable coil spring compressor, compress the coil spring before removing the following components

  1. Remove or disconnect the following:

    Nut on suspension support previously loosened
     
    Washer, cushion, collar, suspension support assembly, upper insulator, lower cup, cushion, spring bumper and coil spring.
     

  2.  

To install:

  1. Install the shock absorber in assembly.
  2.  


WARNING
Using a suitable coil spring compressor, compress the coil spring before installing the following components

  1. Install or connect the following:

    Spring into the spring seat
     

  2.  


NOTE
Make certain that spring seats properly in the seat



Spring bumper, lower cup, cushion, collar, upper insulator, suspension support, cushion and washer to shock
 
Temporarily install center nut
 


NOTE
Rotate the suspension support so that the rod and 1 of the bolts on the suspension support are aligned with the lower shock absorber.



Click image to see an enlarged view

Fig. Alignment of the suspension support-SC 430

  1. Release and remove the coil spring compressor
  2.  
  3. Install rear shock absorber with spring (Strut)
  4.  
  5. Install or connect the following:

    3 nuts attaching the spring support to 47 ft. lbs (64 Nm)
     
    Fully tighten center lock nut to 13 ft. lbs. (18 Nm)
     
    2 bolts attaching assembly to the frame
     
    Rear suspension arm bolts to 81 ft. lbs. (110 Nm)
     
    Stabilizer link and height control link
     
    Shock absorber to suspension arm bolt to 81 ft lbs. (110 Nm)
     
    Suspension arm to axle carrier with camber adjusting cams to 81 ft lbs. (Nm)
     
    Rear wheel
     
    All internal trunk covers, trims and plates
     

  6.  
  7. Inspect and adjust rear wheel alignment
  8.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Front trunk compartment trim cover
     
    Wheel(s).
     
    Brake caliper support bracket from the rear axle carrier by removing the 2 bolts. Leave the brake line connected and position it out of the way.
     
    Nut and disconnect the sway bar link from the lower control arm.
     
    Nut and bolt on the lower end of the strut.
     
    3 upper nuts and lift out the strut. Do not remove the center nut.
     

  4.  
  5. Compress the coil spring.
  6.  
  7. Secure the upper support and remove the strut rod retaining nut.
  8.  
  9. Remove or disconnect the following:

    Upper suspension support
     
    Upper insulator
     
    Coil spring
     
    Spring bumper
     
    Lower insulator
     

  10.  
  11. If discarding the strut, perform the following:
    1. Fully extend the strut rod.
    2.  
    3. Drill a hole in the side of the strut to drain the gas inside
      CAUTION
      The gas coming out is harmless, but be careful of chips that may fly up while drilling.

    4.  

  12.  

To install:

  1. Install or connect the following:

    Lower insulator to the strut.
     
    Spring bumper to the strut piston rod.
     
    Compressed coil spring. Position the coil spring with the end butted against the gap in the lower seat.
     
    Upper insulator and suspension support.
     
    Upper suspension support and tighten a new strut piston rod nut to 20 ft. lbs. (27 Nm).
     

  2.  
  3. Remove the spring compressor.
  4.  
  5. Install or connect the following:

    Strut to the vehicle and tighten the 3 upper mounting nuts to 14 ft. lbs. (20 Nm). Install the cap.
     
    And tighten the lower strut bolt and nut to 101 ft. lbs. (137 Nm).
     
    Sway bar link to the lower control arm. Tighten the nut to 33 ft. lbs. (44 Nm).
     
    Brake caliper to the rear axle carrier by installing the 2 bolts. Tighten the bolts to 77 ft. lbs. (104 Nm).
     
    Wheel(s)
     
    Trunk compartment cover trim
     

  6.  
  7. Check and adjust the vehicle alignment as necessary.
  8.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Raise the rear of the vehicle and support it with safety stands.
  4.  
  5. Remove or disconnect the following:
    CAUTION
    Do not remove the center nut on the strut at this time. The spring on the strut is under high pressure and can cause serious injury.



    Wheel(s).
     
    Brake caliper support bracket by removing the 2 bolts. Leave the brake line connected and position it aside.
     
    Nut and bolt on the lower end of the strut.
     
    Cap nut on the upper end of the strut. Remove the 3 upper nuts and lift out the strut. Do not remove the center nut from the strut.
     

  6.  
  7. Compress the coil spring.
  8.  
  9. Secure the strut housing with 2 nuts and a bolt as shown in the illustration and secure it in a vise.
  10.  
  11. Secure the upper support and remove the strut rod retaining nut.
  12.  
  13. Remove the upper suspension support, upper insulator, coil spring, spring bumper and the lower insulator.
  14.  
  15. If discarding the strut, perform the following:
    1. Fully extend the strut rod.
    2.  
    3. Drill a hole in the strut in the shaded area shown in the illustration and drain the gas inside
      CAUTION
      The gas coming out is harmless, but be careful of chips which may fly up while drilling.

    4.  

  16.  

To install:

  1. Install or connect the following:

    Lower insulator to the strut
     
    Spring bumper to the strut piston rod
     
    The (compressed) coil spring
     

  2.  
  3. Position the coil spring with the end butted against the gap in the lower seat.

    Upper insulator and support matching the bolt of the support with the cut off part of the insulator.
     
    Upper suspension support.
     

  4.  
  5. Secure the upper suspension support and tighten the new strut piston rod nut to 20 ft. lbs. (27 Nm).
  6.  
  7. Remove the spring compressor.

    Strut rod piston nut cap
     
    Strut and the 3 nuts. Tighten the nuts to 19 ft. lbs. (25 Nm). Install the cap.
     
    Lower bolt to hold the strut to the lower control arm. Do not tighten the bolt at this time.
     
    Caliper support bracket and tighten the bolts to 77 ft. lbs. (104 Nm).
     
    Wheel(s)
     

  8.  
  9. Lower the vehicle.
  10.  
  11. Bounce the vehicle several times to normalize the suspension.
  12.  
  13. Support the lower arm.
  14.  
  15. Tighten the lower strut mounting bolt to 106 ft. lbs. (143 Nm).
  16.  
  17. Check the alignment and adjust as necessary.
  18.  

 
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