1998 NISSAN PICK-UP Repair Manual

2. Measure thickness of each disc and plate.
Total thickness ``B'':
19.24 - 20.26 mm (0.7575 - 0.7976 in)
No. of discs and plates (One side):
Friction disc 5
Friction plate 6
Spring disc 1
Spring plate 1
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
master gauge on case B.
Then adjust the dial indicator scale to zero with its tip on the
master gauge.
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 indica-
tion.
Example:
E=AþD=Aþ(B+C)=0.05 to 0.15 mm
A = 49.52 mm
B = 19.45 mm
C = 29.7 mm
D=B+C E=AþD
B ... 19.45 A ... 49.52
+C ... 29.7 þD ... 49.15
49.15 0.37
From the above equation, end play of 0.37 mm exceeds the
specified range of 0.05 to 0.15 mm.
Select suitable discs and plates to adjust correctly.
Assembly
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
friction discs on rear of side gear.
Always position a friction plate first on rear of side gear.
SPD420
SPD418
SPD419
SPD421
LIMITED SLIP DIFFERENTIALH233B
Adjustment (Cont'd)
PD-64

2. Install spring disc.
Align the twelve angular holes in spring disc with the hex-
agonal area of the side gear.
3. Install spring plate.
4. 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.
5. Install differential case B over side gear, discs, plates and
friction plate guide assembly.
lInstall differential case B while supporting friction plate
guides with your middle finger by inserting through oil
hole in differential case.
lBe careful not to detach spring disc from the hexagonal
part of the side gear.
6. Install pinion mate gears and pinion shaft to differential
case B.
SPD422
SPD423
SPD424
SPD425
SPD426
LIMITED SLIP DIFFERENTIALH233B
Assembly (Cont'd)
PD-65

7. Install thrust block.
8. Install side gear to pinion mate gears.
9. Install each disc and plate.
Use same procedures as outlined in steps 1. through 4.
10. Install differential case A.
Position differential cases A and B by correctly aligning
marks stamped on cases.
11. Tighten differential case bolts.
12. Place ring gear on differential case and install new lock
straps and bolts.
Tighten bolts in a criss-cross fashion, lightly tapping bolt
head with a hammer.
Then bend up lock straps to lock the bolts in place.
13. Install side bearing inner cone.
14. Check differential torque.
SPD427
SPD429
SPD430
SPD288
LIMITED SLIP DIFFERENTIALH233B
Assembly (Cont'd)
PD-66

For quiet and reliable final drive operation, the following five
adjustments must be made correctly:
1. Side bearing preload
2. Pinion gear height
3. Pinion bearing preload. Refer to ``ASSEMBLY'', PD-73.
4. Ring gear-to-pinion backlash. Refer to ``ASSEMBLY'',PD-74.
5. Ring and pinion gear tooth contact pattern
Drive Pinion Height
1.FirstprepareToolsforpinionheightadjustment.
V1HeightGauge(ST31251000)*
V2DummyShaft(ST31181001)*
V3Spacer[thickness:2.00mm(0.0787 in)] (KV38108700)*
V4FeelerGauge (commercial service tool)
2. To simplify the job, make a chart, like the one below, to organize your calculations.
LETTERS HUNDREDTHS OF
A MILLIMETER
H: Head number
D ¢: Figure marked on dummy shaft
S: Figure marked on height gauge
N:Measuringclearance
* Set tools are available: ST3125S000 (tools 1 and 2) ST3125S001 (tools 1, 2 and 3)
3. Write the following numbers down in the chart.H: Head number
D¢: Figure marked on dummy shaft
SPD758
SPD542
SPD759
ADJUSTMENTH233B
PD-67

S: Figure marked on height gauge
4. Place pinion rear bearing inner race and Tools on gear car-
rier.
5. Attach Tool (Height gauge) to gear carrier, and measure the
clearance between the height gauge tip and the dummy shaft
face.
SPD760
SPD271
SPD365A
ADJUSTMENTH233B
Drive Pinion Height (Cont'd)
PD-68

6. Substitute these values into the equation to calculate thethickness of the washer.
If values signifying H, D ¢and S are not given, regard them
as zero and calculate. T(Thicknessofwasher )=Nþ[(HþD¢þS)x0.01]+2.75
Example: N=0.40
H=2
D¢=þ1
S=0
T=Nþ[(HþD ¢þS)x0.01]+2.75
=0.40þ[{2þ(þ1)þ0}x0.01]+2.75
(1) H ................................................................. 2 þD¢ ......................................................... þ(þ1)
3
þS ............................................................... þ0
3
(2) 3 x 0.01
0.03
(3)N............................................................0.40 þ0.03
0.37
(4)0.37 +2.75
3.12
\ T=3.12
7. Select the proper pinion height washer. Drive pinion height adjusting washer:Refer to SDS, PD-80.
If you cannot find the desired thickness of washer, use
washer with thickness closest to the calculated value.
Example: Calculatedvalue.. .T=3.12mm
Usedwasher.. .T=3.13mm
ADJUSTMENTH233B
Drive Pinion Height (Cont'd)
PD-69

Tooth Contact
Gear tooth contact pattern check is necessary to verify correct
relationship between ring gear and drive pinion.
Hypoid gear sets which are not positioned properly may be
noisy, or have short life or both. With a pattern check, the most
desirable contact for low noise level and long life can be assured.
1. Thoroughly clean ring gear and drive pinion teeth.
2. Sparingly apply a mixture of powdered ferric oxide and oil or
equivalent to 3 or 4 teeth of ring gear drive side.
3. Hold companion flange steady and rotate the ring gear in
both directions.
SPD005
SPD695
SPD007
ADJUSTMENTH233B
PD-70

Differential Case
1. Measure clearance between side gear thrust washer and
differential case.
Clearance between side gear thrust washer
and differential case (A þ B):
Less than 0.15 mm (0.0059 in)
The clearance can be adjusted with side gear thrust washer.
Refer to SDS, PD-80.
2. Apply gear oil to gear tooth surfaces and thrust surfaces and
check to see they turn properly.
3. Install differential case LH and RH.
4. Install differential case on ring gear.
5. Place differential case on ring gear.
6. Apply locking agent [Locktite (stud lock) or equivalent] to ring
gear bolts, and install them.
Tighten bolts in a criss-cross fashion, lightly tapping bolt
head with a hammer.
7. Press-fit side bearing inner cones on differential case with
Tool.
Tool numbers:
VAST33190000
VBST33081000
SPD656
SPD643
SPD746
PD353
ASSEMBLYH233B
PD-71