Infiniti QX4 (R50). Manual — part 519
DISASSEMBLY
NBPD0036
SPD404A
CAUTION:
Do not run engine when one wheel (rear) is off the ground.
SPD275
1.
Remove side bearing inner cone with Tool.
2.
Loosen ring gear bolts in a criss-cross pattern.
3.
Tap ring gear off gear case with a soft hammer.
Tap evenly all around to keep ring gear from binding.
SPD363A
4.
Remove couple bolts on differential cases A and B with a
press.
Tool number: ST33081000 (
—
)
5.
Separate differential case A and B.
Draw out component parts (discs and plates, etc.).
Put marks on gears and pressure rings so that they can be
reinstalled in their original positions from which they were
removed.
REAR FINAL DRIVE
H233B
Limited Slip Differential (Cont’d)
PD-48
SPD359A
INSPECTION
NBPD0037
Contact Surfaces
NBPD0037S01
1.
Clean the disassembled parts in suitable solvent and blow dry
with compressed air.
2.
If following surfaces are found with burrs or scratches, smooth
with oil stone.
1 Differential case B
2 Differential case A
3 Side gear
4 Pinion mate gear
5 Pinion mate shaft
6 Friction plate guide
Disc and Plate
NBPD0037S02
1.
Clean the discs and plates in suitable solvent and blow dry with
compressed air.
2.
Inspect discs and plates for wear, nicks and burrs.
SPD279
3.
To test if friction disc or plate is not distorted, place it on a sur-
face plate and rotate it by hand with indicating finger of dial
gauge resting against disc or plate surface.
Allowable warpage:
0.08 mm (0.0031 in)
If it exceeds limits, replace with a new plate to eliminate pos-
sibility of clutch slippage or sticking.
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-49
SPD381A
4.
Measure frictional surfaces and projected portions of friction
disc, friction plate, spring plate, and determine each part’s dif-
ferences to see if the specified wear limit has been exceeded.
If any part has worn beyond the wear limit, and deformed or
fatigued, replace it with a new one that is the same thickness as
the projected portion.
Wear limit:
0.1 mm (0.004 in) or less
A − B = Wear limit mm (in)
I
: Measuring points
A: Projected portion
B: Frictional surface
SPD383A
SPD417
ADJUSTMENT
NBPD0038
Friction Disc and Friction Plate End Play
NBPD0038S01
End play of friction disc and friction plate can be calculated by using
following equation and should be adjusted within following range.
Adjustment can be made by selecting friction disc having two dif-
ferent thicknesses.
End play E:
0.05 - 0.15 mm (0.0020 - 0.0059 in)
E = A − (B + C)
A: Length of differential case contact surface to differential case
inner bottom.
B: Total thickness of friction discs, friction plates, spring disc and
spring plate in differential case on one side.
C: Length of differential case contact surface to back side of side
gear.
1.
Measure values of “A”.
Standard length A:
49.50 - 49.55 mm (1.9488 - 1.9508 in)
SPD420
2.
Measure thickness of each disc and plate.
Total thickness “B”:
19.24 - 20.26 mm (0.7575 - 0.7976 in)
REAR FINAL DRIVE
H233B
Limited Slip Differential (Cont’d)
PD-50
SPD418
3.
Measure values of “C”.
a.
Attach a dial indicator to the base plate.
b.
Place differential case B on the base plate, and install a mas-
ter gauge on case B.
Then adjust the dial indicator scale to zero with its tip on
the master gauge.
SPD419
c.
Install pinion mate gears, side gears and pinion mate shaft in
differential case B.
d.
Set dial indicator’s tip on the side gear, and read the indication.
Example:
E = A − D = A − (B + C) = 0.05 to 0.15 mm
A = 49.52 mm
B = 19.45 mm
C = 29.7 mm
D = B + C
49.15 (D) = 19.45 (B) + 29.7 (C)
E = A − D
0.37 (E) = 49.52 (A) − 49.15 (D)
From the above equation, end play of 0.37 mm exceeds the speci-
fied range of 0.05 to 0.15 mm.
Select suitable discs and plates to adjust correctly.
SPD421
ASSEMBLY
NBPD0039
Prior to assembling discs and plates, properly lubricate them by
dipping them in limited slip differential oil.
1.
Alternately position specified number of friction plates and fric-
tion discs on rear of side gear.
Always position a friction plate first on rear of side gear.
SPD384A
2.
Install spring plate.
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-51
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