NISSAN PICK-UP 1998 Repair Manual

Be careful not to confuse the right and left hand parts.
2. Loosen ring gear bolts in a criss-cross fashion.
3. Tap ring gear off differential case with a soft hammer.
Tap evenly all around to keep ring gear from binding.
4. Separate differential case LH and RH.
Put match marks on both differential case LH and RH sides
prior to separating them.
Extension Tube and Differential Side Shaft
1. Remove differential side shaft assembly from extension tube.
2. Cut rear axle bearing collar with cold chisel. Be careful not
to damage differential side shaft.
SPD022
SPD024
SPD643
SPD644
SPD236A
DISASSEMBLYR180A
Differential Case (Cont'd)
PD-20

3. Reinstall differential side shaft into extension tube and
secure with bolts. Remove rear axle bearing by drawing out
differential side shaft from rear axle bearing with puller.
4. Remove grease seal.
SPD646
SPD647
DISASSEMBLYR180A
Extension Tube and Differential Side Shaft
(Cont'd)
PD-21

Ring Gear and Drive Pinion
Check gear teeth for scoring, cracking or chipping.
If any damaged part is evident, replace ring gear and drive pin-
ion as a set (hypoid gear set).
Differential Case Assembly
Check mating surfaces of differential case, side gears, pinion
mate gears, pinion mate shaft and thrust washers.
Bearing
1. Thoroughly clean bearing.
2. Check bearing for wear, scratches, pitting or flaking.
Check tapered roller bearing for smooth rotation. If damaged,
replace outer race and inner cone as a set.
SPD648
SPD715
INSPECTIONR180A
PD-22

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
4. Ring gear-to-pinion backlash. Refer to ``ASSEMBLY'',
PD-30.
5. Ring and pinion gear tooth contact pattern
Side Bearing Preload
A selection of carrier side retainer adjusting shims is
required for successful completion of this procedure.
1. Make sure all parts are clean. Also make sure the bearings
are well lubricated with light oil or type ``DEXRON
TM'' auto-
matic transmission fluid.
2. Install differential carrier and side bearing assembly into the
final drive housing.
3. Place all of the original side retainer adjusting shims onto the
side bearing retainer that goes at the ring gear end of the
carrier.
4. Install both bearing retainers onto the final drive housing and
torque the retainer bolts.
Bolt torque specification:
:9-12N´m(0.9 - 1.2 kg-m, 78 - 104 in-lb)
5. Turn the carrier several times to seat the bearings.
6. Measure the carrier turning torque with a spring gauge at the
ring gear retainer bolt.
Turning torque specification:
34.3 - 39.2 N (3.5 - 4.0 kg, 7.7 - 8.8 lb)
of pulling force at the ring gear bolt
SPD191A
SPD192A
SPD193A
SPD194A
ADJUSTMENTR180A
PD-23

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