Infiniti QX4 (R50). Manual — part 520
SPD385A
3.
Install friction plate guides.
Correctly align the raised portions of friction plates, and apply
grease to inner surfaces of friction plate guides to prevent
them from falling.
SPD386A
4.
Install differential case B over side gear, discs, plates and fric-
tion plate guide assembly.
I
Install differential case B while supporting friction plate
guides with your middle finger inserted through oil hole in
differential case.
I
Be careful not to detach spring disc from the hexagonal
part of the side gear.
SPD426
5.
Install pinion mate gears and pinion mate thrust washers on
pinion mate shaft, then install pinion mate shaft in differential
case B.
SPD387A
6.
Install side gear to pinion mate gears.
7.
Install each disc and plate.
Use same procedures as outlined in steps 1. through 4. above.
SPD388A
8.
Install differential case A.
Position differential cases A and B by correctly aligning marks
stamped on cases.
REAR FINAL DRIVE
H233B
Limited Slip Differential (Cont’d)
PD-52
SPD364A
9.
Tighten differential case couple bolts.
10. Place ring gear on differential case and tighten ring gear bolts.
Tighten bolts in a criss-cross pattern, lightly tapping bolt head
with a hammer.
Then bend up lock straps to lock the bolts in place.
11. Install side bearing inner cone.
12. Check differential torque.
Adjustment
NBPD0040
For quiet and reliable final drive operation, the following five adjust-
ments must be made correctly:
1.
Side bearing preload
2.
Pinion gear height
3.
Side bearing preload
4.
Ring gear-to-pinion backlash. Refer to SDS, PD-62.
5.
Ring and pinion gear tooth contact pattern
SPD196A
PINION GEAR HEIGHT
NBPD0040S01
1.
Make sure all parts are clean and that the bearings are well
lubricated.
2.
Assemble the pinion gear bearings into the pinion pre-load
shim selector tool, J34309.
SPD197A
I
Rear Pinion Bearing — the rear pinion bearing pilot,
J34309-8, is used to center the rear pinion bearing only. The
rear pinion bearing locking seat, J34309-4, is used to lock the
bearing to the assembly.
I
Front Pinion Bearing — make sure the J34309-3, front pin-
ion bearing seat is secured tightly against the J34309-2 gauge
anvil. Then turn the front pinion bearing pilot, J34309-5, to
secure the bearing in its proper position.
SPD216A
3.
Place the pinion preload shim selector tool gauge screw
assembly, J34309-1, with the pinion rear bearing inner cone
installed, into the final drive housing.
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REAR FINAL DRIVE
H233B
Limited Slip Differential (Cont’d)
PD-53
SPD217A
4.
Install the J34309-2 gauge anvil with the front pinion bearing
into the final drive housing and assemble it to the J34309-1
gauge screw. Make sure that the J34309-16 gauge plate will
turn a full 360 degrees, and tighten the two sections by hand
to set bearing pre-load.
5.
Turn the assembly several times to seat the bearings.
SPD234A
6.
Measure the turning torque at the end of the J34309-2 gauge
anvil using torque wrench J25765A.
Turning torque specification:
0.4 - 0.9 N·m (4 - 9 kg-cm, 3.5 - 7.8 in-lb)
SPD208A
7.
Place the J34309-12 “H233B” pinion height adapter onto the
gauge plate and tighten it by hand.
CAUTION:
Make sure all machined surfaces are clean.
SPD286A
PINION HEIGHT ADJUSTING WASHER SELECTION
8.
Position the J25269-18 side bearing discs and the arbor into
the side bearing bores.
SPD237A
9.
Install the bearing caps and torque the bolts.
Specification:
93 - 103 N·m (9.5 - 10.5 kg-m, 69 - 76 ft-lb)
REAR FINAL DRIVE
H233B
Adjustment (Cont’d)
PD-54
SPD204A
10. Select the correct standard pinion height adjusting washer
thickness using a standard gauge of 2.5, 3.0, or 3.5 mm
(0.098, 0.118, or 0.138 in) and your J34309-101 feeler gauge.
Measure the distance between the J34309-12 “H233B” pinion
height adapter and the arbor.
SPD779
11. Write down your exact total measurement.
SPD542
12. Correct the pinion height washer size by referring to the “pin-
ion head height number”.
There are two numbers painted on the pinion gear. The first
one refers to the pinion and ring gear as a matched set and
should be the same as the number on the ring gear. The sec-
ond number is the “pinion head height number”, and it refers
to the ideal pinion height from standard for the quietest opera-
tion. Use the following chart to determine the correct pinion
height washer. Refer to SDS, PD-63.
Pinion Head Height Number
Add or Remove from the Selected
Standard Pinion Height Washer
Thickness Measurement
−6
Add 0.06 mm (0.0024 in)
−5
Add 0.05 mm (0.0020 in)
−4
Add 0.04 mm (0.0016 in)
−3
Add 0.03 mm (0.0012 in)
−2
Add 0.02 mm (0.0008 in)
−1
Add 0.01 mm (0.0004 in)
0
Use the selected washer thickness
+1
Subtract 0.01 mm (0.0004 in)
+2
Subtract 0.02 mm (0.0008 in)
+3
Subtract 0.03 mm (0.0012 in)
+4
Subtract 0.04 mm (0.0016 in)
+5
Subtract 0.05 mm (0.0020 in)
+6
Subtract 0.06 mm (0.0024 in)
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REAR FINAL DRIVE
H233B
Adjustment (Cont’d)
PD-55
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