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:

    Negative battery cable.
     
    Front wheel
     
    Brake caliper, leaving the line attached
     

  4.  
  5. Loosen the 3 upper strut mounting nuts.
  6.  
  7. Loosen, but do not remove, the upper strut rod nut.
  8.  


CAUTION
Do NOT remove the upper strut nut at this time.

  1. Remove or disconnect the following:

    Anti-lock Brake System (ABS) speed sensor and harness
     
    Upper suspension arm from the steering knuckle
     
    Stabilizer bar from the link and remove the bracket
     
    Strut from the lower suspension arm.
     
    3 upper strut mounting nuts and remove the strut
     

  2.  
  3. Compress the coil spring.
  4.  
  5. Remove or disconnect the following:

    Piston rod locknut
     
    Suspension support, coil spring and bumper
     

  6.  
  7. If disposing the strut, perform the following procedure:
    1. Fully extend the strut rod.
    2.  
    3. Drill a hole near the bottom of the shock to remove the gas inside.
    4.  

  8.  


CAUTION
The gas is harmless, but be careful of chips that may fly up when the gas is released.

To install:



Click image to see an enlarged view

Fig. Matching the spring to the seat

  1. Install or connect the following:

    Spring bumper
     
    Coil spring
     
    Suspension support to the rod and temporarily install a new nut
     

  2.  
  3. Turn the suspension support so one of the bolts on the support faces the same direction as shown in the illustration.
  4.  


NOTE
Align the bolt so a line drawn between the rod and bolt would be at 90°to the direction of the lower bushing.

  1. Install or connect the following:

    Spring compressor
     
    Strut and tighten the upper retaining nuts to 41 ft. lbs. (56 Nm)
     
    New upper strut rod nut to 20 ft. lbs. (27 Nm)
     
    Strut to the lower arm and temporarily tighten the nut and bolt
     
    Stabilizer bar bracket and tighten the bolts to 21 ft. lbs. (28 Nm)
     
    The stabilizer bar to the link and tighten the bolts to 29 ft. lbs. (39 Nm)
     
    Upper suspension arm to the steering knuckle. Tighten the nut to 64 ft. lbs. (87 Nm) and install a new cotter pin.
     
    ABS speed sensor and tighten the bolt to 69 inch lbs. (8 Nm)
     
    Caliper
     
    Wheel
     

  2.  
  3. Bounce the vehicle several times to stabilize the suspension.
  4.  
  5. Tighten the lower strut bolt and nut to 116 ft. lbs. (157 Nm).
  6.  
  7. Check the front wheel alignment.
  8.  



Click image to see an enlarged view

Fig. Exploded view of front strut assembly-SC 430

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

    Tire and wheel assembly
     
    Speed sensor assembly
     
    Upper suspension arm from the steering knuckle
     
    Shock absorber from the mounting bracket
     

  4.  


CAUTION
Loosen the piston rod lock nut. Do Not remove at this time



3 nuts front spring support reinforcement and strut assembly
 

  1. Remove the shock absorber from the spring assembly
  2.  
  3. Remove or disconnect the following:
    1. Compress the coil spring with proper spring compressor
    2.  
    3. Remove the piston lock nut
    4.  
    5. Remove the front suspension support assembly, front coil spring insulator and coil spring.
    6.  

  4.  

To install:

  1. Install the shock into the spring assembly
    1. Install the spring insulator
    2.  
    3. Compress the coil spring using the proper spring compressor
    4.  
    5. Install spring making sure that the spring seats properly
    6.  


      Click image to see an enlarged view

      Fig. Strut to suspension support alignment-SC 430

    7. Temporarily install a new lock nut
    8.  
    9. Align the suspension support with the shock absorber lower bolt
    10.  

  2.  
  3. Install or connect the following:

    3 bolts attaching the strut assembly to the support assembly to 41 ft. lbs (56 Nm)
     
    Fully tighten piston lock nut to 21 ft. lbs. (28 Nm)
     
    Strut assembly to mounting bracket to 116 ft lbs. (157 Nm)
     
    Upper suspension arm to steering knuckle to 64 ft. lbs. (87 Nm)
     
    Speed sensor
     
    Tire & wheel
     

  4.  

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

    Negative battery cable.
     
    Front wheel
     
    Brake caliper, leaving the line attached
     

  4.  
  5. Loosen the 3 upper strut mounting nuts.
  6.  
  7. Loosen, but do not remove, the upper strut rod nut.
    CAUTION
    Do not remove the upper strut nut at this time.

  8.  
  9. Remove or disconnect the following:

    Anti-lock Brake System (ABS) speed sensor and harness
     
    Upper suspension arm from the steering knuckle
     
    Stabilizer bar from the link and remove the bracket
     
    Strut from the lower suspension arm.
     
    3 upper strut mounting nuts and remove the strut.
     

  10.  
  11. Compress the coil spring.
  12.  
  13. Remove or disconnect the following:

    Piston rod locknut
     
    Suspension support, coil spring and bumper.
     

  14.  
  15. If disposing the strut, perform the following procedure:
    1. Fully extend the strut rod.
    2.  
    3. Drill a hole near the bottom of the shock to remove the gas inside.
      CAUTION
      The gas is harmless, but be careful of chips that may fly up when the gas is released.

    4.  

  16.  

To install:

Click image to see an enlarged view

Fig. Matching the spring to the seat

  1. Install or connect the following:

    Spring bumper
     
    Coil spring
     
    Suspension support to the rod and temporarily install a new nut
     

  2.  
  3. Turn the suspension support so one of the bolts on the support faces the same direction as shown in the illustration.
    NOTE
    Align the bolt so a line drawn between the rod and bolt would be at 90° to the direction of the lower bushing.

  4.  
  5. Install or connect the following:

    Spring compressor
     
    Strut and tighten the upper retaining nuts to 41 ft. lbs. (56 Nm).
     
    New upper strut rod nut to 20 ft. lbs. (27 Nm).
     
    Strut to the lower arm and temporarily tighten the nut and bolt.
     
    Stabilizer bar bracket and tighten the bolts to 21 ft. lbs. (28 Nm).
     
    The stabilizer bar to the link and tighten the bolts to 29 ft. lbs. (39 Nm).
     
    Upper suspension arm to the steering knuckle. Tighten the nut to 64 ft. lbs. (87 Nm) and install a new cotter pin.
     
    ABS speed sensor and tighten the bolt to 69 inch lbs. (8 Nm).
     
    Caliper
     
    Wheel
     

  6.  
  7. Bounce the vehicle several times to stabilize the suspension.
  8.  
  9. Tighten the lower strut bolt and nut to 116 ft. lbs. (157 Nm).
  10.  
  11. Check the front wheel alignment.
  12.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:
    CAUTION
    Do not remove the center bolt to the strut at this time. The spring on the strut is under high pressure and can cause serious injury or vehicle damage.



    Tire and wheel assembly
     
    Brake caliper support bracket
     
    Fender apron
     
    Engine undercover
     
    Front fender wheel opening molding
     
    If removing the left side strut, the windshield washer tank
     
    Anti-lock Brake System (ABS) speed sensor at the steering knuckle.
     
    Wiring harness clamp in order to prevent the harness from being damaged when removing the through-bolt.
     
    Plug from the upper strut mount. Do not remove the center bolt.
     



    Upper control arm through-bolt from the subframe
     
    Upper control arm and turn the control arm completely around. It is not necessary to remove the upper ball joint.
     
    Strut at the lower control arm by removing the nut and bolt.
     
    3 upper mounting nuts and remove the strut assembly with the coil spring from the vehicle.
     

  4.  
  5. Compress the coil spring.
  6.  
  7. Remove or disconnect the following:

    Piston rod locknut
     
    Suspension support
     
    Coil spring
     
    Bumper
     

  8.  
  9. If disposing the strut, perform the following procedure:
    1. Fully extend the strut rod.
    2.  
    3. Drill a hole within the shaded area shown in the illustration to remove the gas inside and dispose the old strut.
      CAUTION
      The gas is harmless, but be careful of chips which may fly up when drilling.

    4.  

  10.  

To install:

  1. Install or connect the following:

    Spring bumper
     
    Coil spring
     
    Suspension support to the rod and temporarily install a new nut.
     

  2.  
  3. Turn the suspension support so one of the bolts on the support faces the same direction as shown in the illustration.
    NOTE
    Align the bolt so a line drawn between the rod and bolt would be at 90° to the direction of the lower bushing.

  4.  
  5. Remove the spring compressor.
  6.  
  7. Install or connect the following:

    Strut and tighten the 3 upper strut mount nuts to 26 ft. lbs. (35 Nm). Tighten the middle nut to 22 ft. lbs. (29 Nm) and install the plug.
     
    Lower end of the strut to the lower control arm. Do not tighten the bolt at this time.
     
    Upper control arm and install the through-bolt and nut. Do not tighten the bolt at this time.
     
    VSS, wiring harness and the washer tank
     
    Fender apron and the engine undercover
     
    Caliper support bracket and tighten the bolts to 87 ft. lbs. (118 Nm).
     
    Tire and wheel assembly
     

  8.  
  9. Lower the vehicle.
  10.  
  11. Bounce the vehicle a few times to stabilize the suspension, then tighten the strut to lower arm bolt to 106 ft. lbs. (143 Nm). Tighten the upper arm to 121 ft. lbs. (164 Nm).
  12.  
  13. Check the front end alignment.
  14.  

 
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