Suspension: Overhaul Lexus LS IV

DISASSEMBLY

HINT

1. Use the same procedures for the RH side and LH side.
2. The procedures listed below are for the LH side.

Scheme 223

1. REMOVE FRONT SUPPORT TO FRONT SHOCK ABSORBER LH NUT Install SST to the front coil spring so that the distance between the upper and lower hooks is as wide as possible within the installation area. SST 09727-30021 (09727-00010, 09727-00021, 09727-00031) Compress the front coil spring until it can be moved freely. NOTE: Do not use an impact wrench. It will damage SST. HINT: The front coil spring can also be compressed using a hydraulic spring compressor. Remove the nut.
2. REMOVE FRONT SUPPORT TO FRONT SHOCK ABSORBER LH COLLAR Remove the collar from the shock absorber.
3. REMOVE FRONT SUSPENSION SUPPORT SUB-ASSEMBLY LH Remove the suspension support assembly with the insulator upper from the shock absorber.
4. REMOVE FRONT COIL SPRING LH Remove the coil spring from the shock absorber.
5. REMOVE FRONT COIL SPRING INSULATOR UPPER LH Remove the insulator upper from the suspension support.
6. REMOVE FRONT COIL SPRING INSULATOR LOWER LH Remove the insulator lower from the shock absorber.

Scheme 224

1. INSPECT FRONT SHOCK ABSORBER ASSEMBLY LH Extend and compress the front shock absorber. When extending and compressing the front shock absorber at a constant speed, it can be moved without any abnormal resistance or noise and load is constant through the entire stroke. It also extends at a constant speed after being compressed. If there is any abnormality, replace the front shock absorber with a new one. NOTE: When disposing of the front shock absorber, see «DISPOSAL»(ref-349722-S42770765162009120800000) .

REASSEMBLY

HINT

1. Use the same procedures for the RH side and LH side.
2. The procedures listed below are for the LH side.

Scheme 225

Scheme 226

Scheme 227

Scheme 228

Scheme 229

1. INSTALL FRONT COIL SPRING INSULATOR LOWER LH Install the front coil spring insulator lower to the front shock absorber so that both recessed parts are aligned.
2. INSTALL FRONT COIL SPRING LH Using SST, compress the coil spring. SST 09727-30021 (09727-00010,09727-00021, 09727-00031) NOTE: Do not use an impact wrench. It will damage SST. Install the coil spring so that the end comes to the stepped portion of the coil spring insulator lower.
3. INSTALL FRONT COIL SPRING INSULATOR UPPER LH Align the bolt of the front suspension support and the cutout of the front coil spring insulator, and install the front coil spring insulator on the front suspension support. Align the width across flat of the piston rod end and of the front suspension support to install the front shock absorber.
4. INSTALL FRONT SUSPENSION SUPPORT SUB-ASSEMBLY LH Install the suspension support assembly with the insulator upper to the shock absorber.
5. INSTALL FRONT SUPPORT TO FRONT SHOCK ABSORBER LH COLLAR Install the collar to the shock absorber.
6. INSTALL FRONT SUPPORT TO FRONT SHOCK ABSORBER LH NUT Temporarily install a new lock nut to the front shock absorber. Adjust the front suspension support so that the bolts come to the positions as shown in the illustration, and remove SST from the front coil spring. NOTE: Do not use an impact wrench. Make sure that the width across flat on the piston rod end is located parallel to the shock absorber bush. Make sure of the direction of the front suspension support when removing SST. Install the front suspension support so that the paint marks face vehicle outside.

Scheme 230

Scheme 231

1. INSTALL FRONT SHOCK ABSORBER ASSEMBLY LH Install the front shock absorber on the vehicle by installing the 3 nuts on the suspension support side. Torque: 67 N*m (683 kgf*cm, 49 ft.*lbf) Tighten the lock nut. Torque: 28 N*m (280 kgf*cm, 20 ft.*lbf)
2. INSTALL ENGINE ROOM SIDE COVER LH (See «INSTALLATION»(ref-349714-S23488176532009120800000) )
3. INSTALL AIR CLEANER INLET COVER SUB-ASSEMBLY
4. TEMPORARILY TIGHTEN FRONT NO. 2 SUSPENSION LOWER ARM ASSEMBLY LH (See «INSTALLATION»(ref-349722-S36481182872009120800000) )
5. INSTALL FRONT STABILIZER LINK ASSEMBLY LH (See «INSTALLATION»(ref-349722-S02097916402009120800000) )
6. CONNECT FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH (See «INSTALLATION»(ref-349722-S02097916402009120800000) )
7. INSTALL FRONT NO. 1 SUSPENSION LOWER ARM ASSEMBLY LH (See «INSTALLATION»(ref-349749-S39253153892009120800000) )
8. CONNECT TIE ROD ASSEMBLY LH (See «INSTALLATION»(ref-349733-S30676435532009120800000) )
9. INSTALL FRONT DISC BRAKE DUST COVER LH (See «INSTALLATION»(ref-349749-S39253153892009120800000) )
10. INSTALL FRONT DISC (See «INSTALLATION»(ref-349719-S33447390982009120800000) )
11. CONNECT FRONT DISC BRAKE CALIPER ASSEMBLY LH (See «INSTALLATION»(ref-349749-S39253153892009120800000) )
12. CONNECT SPEED SENSOR CONNECTOR (See «INSTALLATION»(ref-349749-S39253153892009120800000) )
13. STABILIZE SUSPENSION Install the front tires. Torque: 140 N*m (1428 kgf*cm, 103 ft.*lbf) Lower the vehicle and bounce it up and down several times to stabilize the front suspension. Remove the front tires. Jack up the front suspension lower arm with a wooden block between the jack and front suspension lower arm. Apply a load to the front suspension so that the front suspension lower arm is placed in a horizontal position.
14. TIGHTEN FRONT NO. 2 SUSPENSION LOWER ARM ASSEMBLY LH (See «INSTALLATION»(ref-349722-S02097916402009120800000) )
15. INSTALL FRONT WHEEL Torque: 140 N*m (1428 kgf*cm, 103 ft.*lbf)
16. INSPECT AND ADJUST FRONT WHEEL ALIGNMENT Inspect and adjust the front wheel alignment (see «ADJUSTMENT»(ref-349722-S12260449942009120800000) ).
17. VEHICLE PREPARATION FOR HEADLIGHT AIMING ADJUSTMENT (See «ADJUSTMENT»(ref-349731-S09246046722009120800000) )
18. PREPARATION FOR HEADLIGHT AIMING (Using a screen) (See «ADJUSTMENT»(ref-349731-S09246046722009120800000) )
19. HEADLIGHT AIMING INSPECTION (See «ADJUSTMENT»(ref-349731-S09246046722009120800000) )
20. HEADLIGHT AIMING ADJUSTMENT (See «ADJUSTMENT»(ref-349731-S09246046722009120800000) )

Scheme 232

1. DISPOSE OF FRONT SHOCK ABSORBER ASSEMBLY LH Fully extend the front shock absorber rod. Using a drill, make a hole in the cylinder between A and B shown in the illustration to discharge the gas inside. CAUTION: Be careful when drilling because shards of metal may fly about. Always use the proper safety equipment. NOTE: The gas is colorless, odorless and nonpoisonous.

Scheme 233

Scheme 234

Scheme 235

Scheme 236

HINT

1. Use the same procedures for the RH side and LH side.
2. The procedures listed below are for the LH side.

Scheme 237

1. REMOVE REAR SUPPORT TO REAR SHOCK ABSORBER LH NUT Install SST to the rear coil spring so that the distance between the upper and lower hooks is as wide as possible within the installation area. SST 09727-30021 (09727-00010,09727-00021, 09727-00031) Compress the rear coil spring until it can be moved freely. NOTE: Do not use an impact wrench. It will damage SST. HINT: The rear coil spring can also be compressed using a hydraulic spring compressor. Remove the nut.
2. REMOVE REAR SUPPORT TO REAR SHOCK ABSORBER LH COLLAR Remove the collar from the shock absorber.
3. REMOVE REAR SUSPENSION SUPPORT ASSEMBLY Remove the suspension support assembly with the insulator upper from the shock absorber.
4. REMOVE REAR COIL SPRING INSULATOR UPPER LH Remove the insulator upper from the suspension support.
5. REMOVE REAR COIL SPRING LH Remove the coil spring from the shock absorber.
6. REMOVE REAR COIL SPRING INSULATOR LOWER LH Remove the insulator lower from the shock absorber.

HINT

1. Use the same procedures for the RH side and LH side.
2. The procedures listed below are for the LH side.

Scheme 238

Scheme 239

Scheme 240

1. INSTALL REAR COIL SPRING INSULATOR LOWER LH Install the rear coil spring insulator lower to the rear shock absorber so that both recessed parts are aligned.
2. INSTALL REAR COIL SPRING LH Using SST, compress the coil spring. SST 09727-30021 (09727-00010, 09727-00021, 09727-00031) NOTE: Do not use an impact wrench. It will damage SST. Install the coil spring so that the end comes to the stepped portion of the coil spring insulator lower.
3. INSTALL REAR COIL SPRING INSULATOR UPPER LH Align the bolt of the rear suspension support and the cutout of the rear coil spring insulator, and install the rear coil spring insulator on the rear suspension support. Align the width across flat of the piston rod end and of the rear suspension support to install the rear shock absorber.
4. INSTALL REAR SUSPENSION SUPPORT ASSEMBLY Install the suspension support assembly with the insulator upper to the shock absorber.
5. INSTALL REAR SUPPORT TO REAR SHOCK ABSORBER LH COLLAR Install the collar to the shock absorber.
6. INSTALL REAR SUPPORT TO REAR SHOCK ABSORBER LH NUT Temporarily install a new lock nut to the rear shock absorber. Adjust the rear suspension support so that the bolts come to the positions as shown in the illustration, and remove SST from the rear coil spring. NOTE: Do not use an impact wrench. Make sure that the width across flat on the piston rod end is located parallel to the shock absorber bush. Make sure of the direction of the rear suspension support when removing SST.