1998 NISSAN PICK-UP Repair Manual

7. If the turning torque measured is incorrect, establish the cor-
rect bearing preload by adding to or subtracting from the total
amount of shim thickness.
lIncrease shim thickness to decrease turning torque on the
carrier.
lDecrease shim thickness to increase turning torque on the
carrier.
8. Record the correct, selected total thickness of the side
retainer adjusting shims, and remove the carrier and bear-
ings from the final drive housing. Save all shims for later re-
use.
Drive Pinion Height
1. First prepare Tools for pinion height adjustment.
V1Dummy Shaft (KV38100110)
V2Height Gauge (KV38100120)
V3Collar (KV38100130)
V4Stopper (KV38100140)
V5Feeler Gauge
2. To simplify the job, make a chart, like the one below, to
organize your calculations.
LETTERSHUNDREDTHS OF
A MILLIMETER
H: Head number
D¢: Figure marked on dummy shaft
N: Measuring clearance
3. Write the following numbers down the chart.
H: Head number
SPD195A
SPD595
SPD542
ADJUSTMENTR180A
Side Bearing Preload (Cont'd)
PD-24

D¢: Figure marked on dummy shaft.
4. Set Tool (Dummy shaft) as shown below and tighten drive
pinion nut carefully to correct preload of 1.1 to 1.4 N´m (11
to 14 kg-cm, 9.5 to 12.2 in-lb).
Tool numbers:
VADummy shaft (KV38100110)
VBCollar (KV38100130)
5. Attach Tool (Height gauge) to gear carrier, and measure the
clearance between the height gauge and the dummy shaft
face.
6. Substitute these values into the equation to calculate the
thickness of the washer.
If values signifying H and D¢are not given, regard them as
zero and calculate.
T (Thickness of washer)=Nþ[(HþD¢) x 0.01] + 3.00
Example:
N = 0.23
H=2
D¢=1
T=Nþ[(HþD¢) x 0.01] + 3.00
= 0.23 þ [(2 þ 1) x 0.01] + 3.00
(1) H ................................................................. 2
þD¢.............................................................. þ1
+1
(2) +1
x 0.01
+0.01
(3) N ............................................................ 0.23
þ (+0.01)
0.22
(4) 0.22
+3.00
3.22
\T = 3.22
7. Select the proper pinion height washer.
Drive pinion height adjusting washer:
Refer to SDS, PD-78.
If you cannot find the desired thickness of washer, use
washer with thickness closest to the calculated value.
Example:
Calculated value ... T = 3.22 mm
Used washer ... T = 3.21 mm
SPD596
SPD597
SPD030A
ADJUSTMENTR180A
Drive Pinion Height (Cont'd)
PD-25

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.
SPD357
SPD653
SPD007
ADJUSTMENTR180A
PD-26

Extension Tube and Differential Side Shaft
1. Measure rear axle bearing end play.
Rear axle bearing end play (A þ B):
0.1 mm (0.004 in) or less
The end play can be adjusted with bearing adjusting shim.
Available bearing adjusting shims:
Refer to SDS, PD-78.
2. Install grease seal.
3. Install extension tube retainer, rear axle bearing and rear
axle shaft bearing collar on differential side shaft.
4. Install differential side shaft assembly into extension tube.
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.
Available side gear thrust washers:
Refer to SDS, PD-78.
2. Apply gear oil to gear tooth surfaces and thrust surfaces and
check to see they turn properly.
SPD433A
SPD654
SPD655
SPD656
ASSEMBLYR180A
PD-27

3. Install differential case LH and RH.
4. Place differential case on ring gear.
5. 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.
6. Press-fit side bearing inner cones on differential case with
Tools.
Tool numbers:
VAST33230000
VBST33061000
Final Drive Housing
1. Press-fit front and rear bearing outer races with Tools.
Tool numbers:
VAST30611000
VBST30621000
VCST30701000
SPD643
SPD746
PD353
SPD679
ASSEMBLYR180A
Differential Case (Cont'd)
PD-28

2. Select drive pinion bearing adjusting washer and drive pin-
ion height adjusting washer. Refer to ``ADJUSTMENT'',
PD-24.
3. Install drive pinion height adjusting washer in drive pinion,
and press-fit pinion rear bearing inner cone in it, using press
and Tool.
Tool number: ST30901000
4. Place pinion front bearing inner cone in final drive housing.
5. Apply multi-purpose grease to cavity at sealing lips of oil
seal. Install front oil seal.
Tool number: ST30720000
6. Place drive pinion bearing spacer, pinion bearing adjusting
washer and drive pinion in final drive housing.
7. Insert companion flange into drive pinion by tapping the com-
panion flange with a soft hammer.
8. Tighten pinion nut to the specified torque.
The threaded portion of drive pinion and pinion nut should
be free from oil or grease.
Tool number: ST38060002
SPD377
SPD657
SPD658
SPD659
PD466
ASSEMBLYR180A
Final Drive Housing (Cont'd)
PD-29

9. Turn drive pinion in both directions several revolutions and
measure pinion bearing preload.
Tool number: ST3127S000
Pinion bearing preload (With front oil seal):
1.1 - 1.7 N´m (11 - 17 kg-cm, 9.5 - 14.8 in-lb)
Pinion bearing preload (Without front oil seal):
1.0 - 1.6 N´m (10 - 16 kg-cm, 8.7 - 13.9 in-lb)
When pinion bearing preload is outside the specifications,
replace pinion bearing adjusting washer and spacer with a
different thickness.
10. Select side retainer adjusting shim.
Refer to ``ADJUSTMENT'', PD-23.
11. Press-fit side bearing outer race into side retainer.
Tool numbers:
VAST30611000
VBST30621000
12. Install side oil seal to side retainer.
Tool number: ST33270000
13. Install differential case assembly.
14. Place side retainer adjusting shims (refer to
``ADJUSTMENT'', PD-23), and O-ring on side retainer, and
install them in final drive housing.
Tool number: ST33720000
lAlign arrows stamped on side retainer and final drive hous-
ing.
15. Measure ring gear-to-drive pinion backlash with a dial indi-
cator.
Ring gear-to-drive pinion backlash:
0.13 - 0.18 mm (0.0051 - 0.0071 in)
lIf backlash is too small, decrease thickness of right shim and
increase thickness of left shim by the same amount.
If backlash is too great, reverse the above procedure.
Never change the total amount of shims as it will change the
bearing preload.
SPD634
SPD332
SPD660
PD420
SPD635
ASSEMBLYR180A
Final Drive Housing (Cont'd)
PD-30

16. Check total preload with Tool.
When checking preload, turn drive pinion in both directions
several times to set bearing rollers.
Tool number: ST3127S000
Total preload:
1.2 - 2.3 N´m
(12 - 23 kg-cm, 10 - 20 in-lb)
lIf preload is too great, add the same amount of shim to each
side.
lIf preload is too small, remove the same amount of shim from
each side.
Never add or remove a different number of shims for each
side as it will change ring gear-to-drive pinion backlash.
17. Recheck ring gear-to-drive pinion backlash because
increase or decrease in thickness of shims will cause change
of ring gear to pinion backlash.
18. Check runout of ring gear with a dial indicator.
Runout limit:
0.05 mm (0.0020 in)
lIf backlash varies excessively in different places, the vari-
ance may have resulted from foreign matter caught between
the ring gear and the differential case.
lIf the backlash varies greatly when the runout of the ring gear
is within a specified range, the hypoid gear set or differential
case should be replaced.
19. Check tooth contact. Refer to ``ADJUSTMENT'', PD-26.
20. Install rear cover and gasket.
21. Install extension tube and differential side shaft assembly.
SPD634
SPD561
SPD636
SPD661
ASSEMBLYR180A
Final Drive Housing (Cont'd)
PD-31