Lexus GS, SC 1998-06

Coil Spring Rear Suspension

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Hub & Bearings



Adjustment

Check the backlash in bearing shaft direction and the axle hub deviation. Maximum for backlash should be 0.0020 in. (0.05mm) and for axle hub deviation 0.020 in. (0.05mm).

Click image to see an enlarged view

Fig. Checking wheel bearings for excessive play


NOTE
The rear wheel bearings are non-adjustable. If the wheel bearing is out of specifications, replace the wheel bearing.

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

    Negative battery cable.
     
    Rear tire and wheel assembly
     
    Brake caliper support from the rear axle carrier and support it with a piece of wire
     

  4.  
  5. Place matchmarks on the disc brake rotor and the axle hub.
  6.  
  7. Remove or disconnect the following:

    Brake rotor
     
    Speed sensor
     
    Rear halfshaft
     
    Parking brake shoes
     
    Parking brake cable
     
    Strut rod
     

  8.  
  9. Place matchmarks on the adjusting cam and rear control crossmember.

    Nut, adjusting cam and the washer to the No. 1 control arm
     
    No. 1 lower control arm from the crossmember
     
    Loosen the nut holding the lower control arm to the axle carrier
     
    No. 2 lower control arm from the axle carrier
     
    Nut, then remove the No. 2 lower control arm from the axle carrier
     
    Nut holding the upper control arm to the axle carrier
     
    Axle carrier
     
    Nut holding the No. 1 control arm to the axle carrier
     
    No. 1 lower control arm from the axle carrier
     
    Dust deflector
     
    Axle hub from the carrier
     
    Backing plate
     
    Inner race (outside)
     
    Oil seal
     
    Snapring
     
    Bearing
     

  10.  

To install:

  1. Install or connect the following:
    NOTE
    If the inner races come loose from the bearing outer race, be sure to install them on the same side as before.



    Bearing to the axle carrier
     



    Snapring. Install the inner race (outside) and a new oil seal.
     
    Backing plate. Install the inner race (inside) and press in the axle hub with the proper tools.
     
    Inner oil seal. Align the holes for the speed sensor in the dust deflector and axle carrier. Install the dust deflector.

    Click image to see an enlarged view

    Fig. Exploded view of the axle carrier-GS 300

     
    No. 1 lower arm to the axle carrier and install a new nut. Tighten the nut to 43 ft. lbs. (59 Nm).
     
    Upper control arm to the axle carrier. Tighten the new nut and bolt to 80 ft. lbs. (109 Nm).
     
    No. 2 lower control arm to the axle carrier and tighten a new nut to 110 ft. lbs. (150 Nm)
     
    No. 1 lower control arm to the rear crossmember. Tighten the nut to 136 ft. lbs. (184 Nm).
     
    Strut rod to the axle carrier. Tighten the nuts and bolts to 134 ft. lbs. (184 Nm).
     
    Parking brake cable and slide the backing plate to the inside. Install the hex bolt and tighten it to 132 ft. lbs. (180 Nm).
     
    Shoe guide plate set bolt. Tighten the bolt to 13 ft. lbs. (18 Nm).
     
    4 hub bolts and tighten them to 19 ft. lbs. (26 Nm)
     
    Bolts at the speed sensor and tighten them to 69 inch lbs. (8 Nm)
     
    Parking brake shoes
     
    Halfshafts. Apply the brakes and tighten the locknut to 213 ft. lbs. (289 Nm).
     
    Brake rotor
     
    Brake caliper support to the rear axle carrier. Tighten the bolts to 77 ft. lbs. (104 Nm).
     
    Rear tire and wheel assembly
     
    Negative battery cable
     

  2.  
  3. Lower the vehicle and bounce it a few times to stabilize the suspension.
  4.  

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

    Rear tire and wheel assembly
     
    Brake caliper support bracket
     
    Brake rotor
     
    Speed sensor
     
    Rear halfshaft
     
    Parking brake shoes
     
    2 bolts at the parking brake cable. Remove the 2 hub bolts and the hex bolt. Slide the backing plate to the outside and disconnect the parking brake cable.
     
    Strut rod at the axle carrier
     
    Nut, then press out the upper suspension arm.
     
    Nut, then press out the No. 2 lower suspension arm
     
    Axle carrier
     
    Dust deflector and pull out the oil seal
     
    Axle hub from the carrier
     
    Backing plate
     
    Inner race (outside) from the hub
     
    Oil seal
     
    Snapring
     
    Bearing and inner race (inside)
     

  4.  

To install:

  1. Install or connect the following:
    NOTE
    If the inner races come loose from the bearing outer race, be sure to install them on the same side as before.



    Bearing to the axle carrier
     



    Snapring, the inner race (outside) and a new oil seal
     
    Backing plate. Install the inner race (inside) and press in the axle hub with the proper tools.
     
    New dust deflector
     
    Upper arm to the axle carrier. Tighten the nut and bolt to 65 ft. lbs (88 Nm), rear 55 ft. lbs (74 Nm)
     
    No. 2 lower arm to the carrier and tighten a new nut to 81 ft. lbs. (110 Nm).
     
    Toe control link with camber adjusting cams. Tighten to 36 ft. lbs. (49 Nm). Stabilize and retighten to 44 ft. lbs. (59 Nm).
     
    Rear drive shaft assembly
     
    Parking brake cable and brake assembly
     
    Install the parking brake shoes and the ABS sensor.
     
    Brake rotor
     
    Brake caliper to the rear axle carrier by installing the 2 bolts.
     
    Tighten rear suspension arm assembly to 81 ft. lbs. (110 Nm)
     

  2.  
  3. Inspect and adjust to rear alignment
  4.  
  5. Perform speed sensor signal check.
  6.  

Stabilizer Bar



Removal & Installation
  1. Remove the rear wheels.
  2.  
  3. Remove the 2 nuts and left stabilizer bar link. If the ball joint turns together with the nut, use a hexagon wrench (5 mm) to hold the stud. Repeat for the right side.
  4.  
  5. Remove the 8 bolts, 2 No. 1 brackets and 2 bushings. Two types of bolts are used, so make sure the correct bolts are installed.
  6.  
  7. Remove the stabilizer bar.
  8.  

To install:

  1. Install the stabilizer bar.
  2.  
  3. Install the bushing and bracket with the 2 bolts and tighten to 14 ft. lbs. (19 Nm). Install the bushing to the inner side of the bushing stopper on the stabilizer bar.
  4.  
  5. Connect the stabilizer bar links and tighten the nuts to 29 ft. lbs. (39 Nm). Repeat for the right side.
  6.  
  7. Install the rear wheels.
  8.  
  9. Inspect and adjust rear wheel alignment.
  10.  

Strut & Coil Spring



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

  18.  
  19. Remove or disconnect the following:

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

  20.  
  21. Carefully release the spring compressor and remove the coil spring.
  22.  
  23. 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.
  24.  

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.  

  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:
    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.  



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
    NOTE
    Match mark the camber adjustment cams for proper installation

  8.  
  9. 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
     

  10.  
  11. Remove the shock from the assembly
    WARNING
    Using a suitable coil spring compressor, compress the coil spring before removing the following components

  12.  
  13. 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.
     

  14.  

To install:

  1. Install the shock absorber in assembly.
    WARNING
    Using a suitable coil spring compressor, compress the coil spring before installing the following components

  2.  
  3. Install or connect the following:
    NOTE
    Make certain that spring seats properly in the seat


    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.



    Spring into the spring seat
     



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



    Click image to see an enlarged view

    Fig. Alignment of the suspension support-SC 430

  4.  
  5. Release and remove the coil spring compressor
  6.  
  7. Install rear shock absorber with spring (Strut)
  8.  
  9. 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
     

  10.  
  11. Inspect and adjust rear wheel alignment
  12.  

 
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