LEXUS SC400 1991 Service Repair Manual

(b) Tighten the 8 bolts.
Torque: 22 NVm (225 kgf Vcm, 16 ft Vlbf)
14. CHECK RING GEAR BACKLASH
Using dial gauge, measure the backlash of the ring gear at
3 positions at least.
Backlash (average value):
0.08±0.13 mm (0.0031±0.0051 in.)
NOTICE: The difference between the maximum and minimum
measured values must be less than 0.05 mm (0.0020 in.)
HINT: The measured values should be used for reference
when selecting washers, so make a memo of the values.
If the backlash is not within the specification replace the
washer on the ring gear side with one of a different thickness
using the following procedure.
Adjusting washer thickness: mm (in.)
 No. Thickness No. Thickness No. Thickness 02 2.02 (0.0795) 32 2.32 (0.0913) 62 2.62 (0.1031) 04 2.04 (0.0803) 34 2.34 (0.0921) 64 2.64 (0.1039)
 06 2.06 (0.0811) 36 2.36 (0.0929) 66 2.66 (0.1047)
 08 2.08 (0.0819) 38 2.38 (0.0937) 68 2.68 (0.1055)
 10 2.10 (0.0827) 40 2.40 (0.0945) 70 2.70 (0.1063)
 12 2.12 (0.0835) 42 2.42 (0.0953) 72 2.72 (0.1071)
 14 2.14 (0.0843) 44 2.44 (0.0961) 74 2.74 (0.1079)
 16 2.16 (0.0850) 46 2.46 (0.0969) 76 2.76 (0.1087)
182.18 (0.0858)482.48 (0.0976)782.78 (0.1094) 20 2.20 (0.0866) 50 2.50 (0.0984) 80 2.80 (0.1102) 22 2.22 (0.0974) 52 2.52 (0.0992) 82 2.82 (0.1110) 24 2.24 (0.0882) 54 2.54 (0.1000) 84 2.84 (0.1118) 26 2.26 (0.0890) 56 2.56 (0.1008) 86 2.86 (0.1126)
 28 2.28 (0.0898) 58 2.58 (0.1016)  
 30 2.30 (0.0906) 60 2.60 (0.1024)  
15. MEASURE TOTAL PRELOAD
Using SST and a torque wrench, measure the total preload.
SST 09229±55010
Total preload
In addition to drive pinion preload
0.5±0.8 N Vm (5±8 kgf Vcm, 4.3±6.9 in. Vlbf)
SA±98±
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If the measure preload is less than specification, replace the
washer of the ring gear's tooth surface side with a thicker
one.
If the preload is greater than the specification, replace the
washer of the ring gear's tooth surface side with thinner one.
HINT: Changing the snap ring thickness by 0.02 mm (0.0008
in.) will change the total preload by approx. 0.1 N Vm (1 kgf Vcm,
0.9 in. Vlbf)
16. INSPECT TOOTH CONTACT PATTERN
(a) Coat 3 or 4 teeth at three different position on the ring gear with red lead.
(b) Hold the companion flange firmly and rotate the ring gear in both directions.
(c) Inspect the tooth contact pattern.
If tooth contact pattern is not correct, replace the adjusting
washer installed on the front of the drive pinion rear bearing
to adjust it.
NOTICE: Be sure to always use a new part when replacing ad-
justing washer.
HINT: Refer to the table below for selection of the adjusting
washer.
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±99
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HINT: Adjust washer in 42 (different thicknesses in 0.01 mm
(0.004 in.) unit are available.
Adjusting washer thickness: mm (in.)
 No. Thickness No. Thickness No. Thickness No. Thickness
871.87 (0.0736)981.98 (0.0780)092.09 (0.0823)202.20 (0.0866) 89 1.89 (0.0744) 00 2.00 (0.0787) 11 2.11 (0.0831) 22 2.22 (0.0874) 90 1.90 (0.0748) 01 2.01 (0.0791) 12 2.12 (0.0835) 23 2.23 (0.0878) 91 1.91 (0.0752) 02 2.02 (0.0795) 13 2.13 (0.0839) 24 2.24 (0.0882) 92 1.92 (0.0756) 03 2.03 (0.0799) 14 2.14 (0.0843) 25 2.25 (0.0886)
 93 1.93 (0.0760) 04 2.04 (0.0803) 15 2.15 (0.0846) 26 2.26 (0.0890)
 94 1.94 (0.0764) 05 2.05 (0.0807) 16 2.16 (0.0850) 27 2.27 (0.0894)
 95 1.95 (0.0768) 06 2.06 (0.0811) 17 2.17 (0.0854) 28 2.28 (0.0898)
 96 1.96 (0.0772) 07 2.07 (0.0815) 18 2.18 (0.0858)  
 97 1.97 (0.0776) 08 2.08 (0.0819) 19 2.19 (0.0862)  
17. REMOVE DIFFERENTIAL RETAINER(See page SA±88)
18. REMOVE DIFFERENTIAL CASE (See page SA±88)
19. REMOVE DRIVE PINION
(See page SA±89)
SA±100
±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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20. INSTALL SPACER ON DRIVE PINIONInstall a new spacer on the drive pinion.
21. INSTALL DRIVE PINION AND FRONT BEARING (See page SA±96)
22. INSTALL OIL SLINGER (See page SA±96)
23. INSTALL OIL SEAL
(a) Apply the MP grease to a new oil seal lip.
(b) Using SST, install a new oil seal until its end is flash with the surface of the differential carrier.
SST 09316±60010 (09316±00010, 09316±00040)09502±12010
24. INSTALL COMPANION FLANGE Using SST and a press, install the companion flange.
SST 09223±63010, 09325±40010
NOTICE: Be careful not to damage the oil seal.
25. ADJUST DRIVE PINION PRELOAD
(a) Coat the threads and flange of a new nut with hypoid gear oilfor LSD.
(b) Using SST, tighten the nut. SST 09229±55010, 09330±00021
(c) Using SST and a torque wrench, measure the drive pinion preload.
SST 09229±55010
Preload (at starting):
New bearing
1.2 ± 1.8 N Vm (12.4 ± 18.4 kgf Vcm, 10.8 ± 16.0 in. Vlbf)
Reused bearing
0.5 ± 0.8 N Vm (5.10 ± 8.0 kgf Vcm, 4.3 ± 6.9 in. Vlbf)
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±101
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wIf the preload is greater than the specification, replace
the spacer.
w If the preload is less than the specification, retighten the
nut 13 NVm (130 kgfVcm, 9 ftVlbf) at a time until the
specified preload is reached.
Maximum torque:
490 N Vm (5,000 kgf Vcm, 362 ft Vlbf)
If the maximum torque is exceeded while retightening the
nut, replace the spacer and repeat the preload procedure.
Do not back off the nut to reduce the preload.
26. CHECK RUNOUT OF DRIVE PINION SHAFT Measure the r unout of the drive pinion shaft at a point 10 mm
(0.39 in.) from the end of the shaft.
Maximum runout:
0.08 mm (0.0031 in.)
27. INSTALL DIFFERENTIAL CASE IN CARRIER(See page SA±97)
28. INSTALL O±RING
(a) Coat a new O±ring with hypoid gear oil.
(b) Install the O±ring to the carrier retainer.
29. INSTALL OIL SEAL
(a) Using SST and a press, install a new oil seal to the carrier retainer.
SST 09608±32010, 09608±35014 (09608±06020)
(b) Coat the MP grease to the oil seal lip.
30. INSTALL SIDE BEARING RETAINER (See page SA±97)
31. RECHECK BACKLASH, TOTAL PRELOAD AND TOOTH CONTACT PATTERN
SA±102
±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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32. STAKE DRIVE PINION NUT
33. INSTALL SNAP RING TO SIDE GEAR SHAFT
(a) Install a new snap ring to the shaft.
(b) Coat the MP grease to the snap ring.
34. INSTALL SIDE GEAR SHAFTSUsing a hammer and brass bar install the side gear shafts.
HINT: Whether or not the side gear shaft is making contact
with the pinion shaft can be known by the sound or feeling
when driving it in.
NOTICE: Be careful not to damage the oil seal.
35. REMOVE DIFFERENTIAL CARRIER FROM OVERHAULSTAND, ETC.
36. INSTALL DIFFERENTIAL CARRIER COVER
(a) Clean the contact surfaces of the carrier and cover of any residual packing material using cleaner.
(b) Coat the seal packing to the carrier or cover.
Seal packing:
Part No. 08826±00110, THREE BOND 1389 or equivalent
NOTICE: After installing the cover, wait at least 1 hour before
filling it with oil or running the vehicle.
(c) Install the carrier cover to the carrier with the 8 bolts.
Torque: 47 N Vm (475 kgf Vcm, 34 ft Vlbf)
(d) Install the breather plug.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±103
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DIFFERENTIAL MOUNTING CUSHION
DIFFERENTIAL MOUNT CUSHION
REPLACEMENT
SA0V7±03
1. REMOVE DIFFERENTIAL(See page SA±82)
2. REMOVE DIFFERENTIAL MOUNT CUSHION Using SST, remove the differential mount cushion.
SST 09316±12010, 09570±24010
NOTICE:
w When driving out the mount cushion, be careful not to
touch the member with the SST.
w Align the SST straight so that the bolt of the SST parallels
the center line of the mount cushion.
w When installing the bolts to the LH and RH differential
mount cushions, make sure the bolts are passed through
the correct holes in the SST, as shown in the illustration.
3. INSTALL DIFFERENTIAL MOUNT CUSHION Using SST, install the cushion so that the marks are posi-
tioned, as shown in the illustration.
SST 09570±24010
NOTICE:
wDo not make a mistake with left and right sides or top
and bottom.
w Set the SST after temporarily installing the differential
mount cushion into the member so as not to be installed
at an angle.
w To confirm that the differential mount cushion is aligned
straight in relation to the member, check that the SST is
fully in contact with all of the cushion.
4. INSTALL DIFFERENTIAL (See page SA±83)
SA±104
±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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REAR SUSPENSION
SA0A4±07
DESCRIPTION
The suspension is double wishbone type at the rear. Optimal suspension geometry and wheel alignment
are achieved through analysis of the component design, materials and characteristics to provide a high
level of controllability and riding comfort.
The support rigidity of the suspension has been realized through the ado\
ption of the rear subframe.
±
SUSPENSION AND AXLE REAR SUSPENSIONSA±105
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PREPARATION
SST (SPECIAL SERVICE TOOLS)
SA0A5±02
RECOMMENDED TOOLS
SA06X±03
EQUIPMENT
SA0A7±01
\
 
\

\

Torque wrench 


SA±106±
SUSPENSION AND AXLE REAR SUSPENSION
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REAR SHOCK ABSORBER
COMPONENTS
SA0SB±05
±
SUSPENSION AND AXLE REAR SUSPENSIONSA±107
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