Lexus SC300 / Lexus SC400. Service manual - part 752

3. 

INSTALL STEERING RACK

(a)  Install SST to the steering rack.

HINT: If necessary, scrape the burrs off the steering rack
teeth end and burnish.
SST 09631–20102

(b)  Coat SST with power steering fluid.
(c)  Insert the rack into the cylinder.
(d) Remove 

SST.

4. INSTALL 

CYLINDER 

END 

STOPPER, 

OIL 

SEAL 

AND

SPACERS

(a)  To prevent oil seal lip damage, wind vinyl tape on the steering

rack end, and apply power steering fluid.

(b) Install 

the oil seal by pushing it into the cylinder, without tilting.

NOTICE:

•

Make sure you install the oil seal facing the correct

direction.

•

Take care that the oil seal does not get reversed as you

install it.

(c)  Install the 2 spacers.

(d)  Using SST, drive in the cylinder end stopper.

SST 09620–30010 (09627–30010, 09631–00020)

SR–158

–

STEERING

POWER STEERING

(e)  Using snap ring pliers, install a new snap ring.

5. 

AIR TIGHTNESS TEST

(a) Install SST to the unions of the rack housing.

SST 09631–12071

(b)  Apply 53.3 kPa (400 mmHg, 15.75 inVHg) of vacuum for

about 30 seconds.

(c)  Check that there is no change in the vacuum.

If there is change in the vacuum, check the installation of the
rack housing oil seals.

6. 

INSTALL CONTROL VALVE

(a)  Coat the teflon rings with power steering fluid.
(b)  Push the control valve into the rack housing.

7. 

INSTALL CONTROL VALVE HOUSING

(a)  Coat a new O–ring with power steering fluid, and install it to

the valve housing.

(b)  Using a hexagon wrench, tighten the 2 bolts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

NOTICE: To prevent oil seal lip damage, wind vinyl tape on the

serration part of the control valve shaft.

8. 

INSTALL LOWER BEARING AND SPACER

–

STEERING

POWER STEERING

SR–159

9. 

INSTALL SELF–LOCKING NUT
Using SST to hold the control valve shaft, install a new self–
locking nut.
SST 09616–00010

Torque: 39 N

⋅

m (400 kgf

⋅

cm, 29 ft

⋅

lbf)

10.  INSTALL RACK HOUSING CAP
(a)  Apply sealant to 2 or 3 threads of the cap.

Sealant:

Part No. 08833–00080, THREE BOND 1344, LOCTITE

242 for equivalent

(b)  Install the cap.

Torque: 69 N

⋅

m (700 kgf

⋅

cm, 51 ft

⋅

lbf)

11.  INSTALL RACK GUIDE SEAT, RACK GUIDE AND RACK

GUIDE SPRING

12. ADJUST 

TOTAL 

PRELOAD

(a)  Apply sealant to 2 or 3 threads of the spring cap.

Sealant:

Part No. 08833–00080, THREE BOND 1344, LOCTITE

242 or equivalent

(b)  Using SST, install and torque the spring cap.

SST 09612–24014 (09612–10022)

Torque: 25 N

⋅

m (250 kgf

⋅

cm, 18 ft

⋅

lbf)

(c)  Using SST, return the rack guide spring cap 125

SST 09612–24014 (09612–10022)

(d)  Using SST, turn the control valve shaft right and left 1 or 2

times.
SST 09616–00010

(e)  Loosen the spring cap until the rack guide compression

spring is not functioning.

SR–160

–

STEERING

POWER STEERING

(f) 

Using SST and a torque meter, tighten the rack guide spring
cap until the preload is within specification.
SST 09612–24014 (09612–10022)
09616–00010

Preload (turning):

0.9–1.9 N

⋅

m (9–20 kgf

⋅

cm 7.9–17.3 in.

⋅

lbf)

13.  INSTALL RACK GUIDE SPRING CAP LOCK NUT
(a)  Apply sealant to 2 or 3 threads of the lock nut.

Sealant:

Part No. 08833–00080, THREE BOND 1344, LOCTITE

242 or equivalent

(b)  Using SST, install and torque the lock nut.

SST 09612–24014 (09612–10022, 09617–24020)

Torque: 56 N

⋅

m (570 kgf

⋅

cm, 41 ft

⋅

lbf)

HINT: Use a torque wrench with a fulcrum length of 340 mm
(13.39 in.).

(c)  Recheck the total preload.

Preload (turning):

0.9–1.9 N

⋅

m (9–20 kgf

⋅

cm 7.9–17.3 in.

⋅

lbf)

14.  INSTALL DUST COVER

15.  INSTALL CLAW WASHERS AND RACK ENDS
(a)  Install new claw washer.

HINT: Align the claws of the claw washer with the rack
grooves.

(b)  Using SST, install and torque the rack end.

SST 09612–24014 (09617–24011)
09617–14010

Torque: 92 N

⋅

m (940 kgf

⋅

cm, 68 ft

⋅

lbf)

HINT: Use a torque wrench with a fulcrum length of 340 mm
(13.39 in.).

(c)  Using a brass bar and hammer, stake the claw washer.

–

STEERING

POWER STEERING

SR–161