1998 NISSAN PICK-UP Repair Manual

Pre-inspection
Before disassembling final drive, perform the following inspec-
tion.
lTotal preload
a. Turn drive pinion in both directions several times to seat
bearing rollers correctly.
b. Check total preload with Tool.
Total preload (With front oil seal):
Drive pinion bearing
New: 1.5 - 1.7 N´m (15 - 17 kg-cm, 13 - 15 in-lb)
Old: 1.7 - 2.5 N´m (17 - 25 kg-cm, 15 - 22 in-lb)
Tool number: ST3127S000
lRing gear-to-drive pinion backlash
Check backlash of ring gear with a dial indicator at several
points.
Ring gear-to-drive pinion backlash:
0.13 - 0.18 mm (0.0051 - 0.0071 in)
lRing gear runout
Check runout of ring gear with a dial indicator.
Runout limit:
0.08 mm (0.0031 in)
lTooth contact
Check tooth contact, referring to ``ADJUSTMENT'', PD-70.
lSide gear-to-pinion mate gear backlash
Measure clearance between side gear thrust washer and
differential case with a feeler gauge.
Clearance between side gear thrust washer and
differential case:
0.1 - 0.2 mm (0.004 - 0.008)
SPD149
SPD246
SPD247
SPD004
DISASSEMBLYH233B
PD-56

Differential Carrier
1. Mount final drive assembly on Tool.
Tool numbers:
VAST0501S000
VBST06340000
2. Put match marks on one side of side bearing cap with paint
or punch to ensure that it is replaced in proper position dur-
ing reassembly.
Bearing caps are line-bored during manufacture and should
be put back in their original places.
3. Remove side lock fingers and side bearing caps.
4. Remove side bearing adjuster with Tool.
Tool number: ST32580000
5. Remove differential case assembly with a pry bar.
SPD139
SPD249
SPD250
SPD684
SPD685
DISASSEMBLYH233B
PD-57

Keep the side bearing outer races together with their
respective inner cones Ð do not mix them up.
6. Remove drive pinion nut with Tool.
Tool number: KV38104700
7. Remove companion flange with puller.
8. Remove ABS sensor.
9. Take out drive pinion together with pinion rear bearing inner
cone, drive pinion bearing spacer and pinion bearing adjust-
ing shim.
10. Remove front oil seal and pinion front bearing inner cone.
11. Remove pinion bearing outer races with a brass drift.
12. Remove pinion rear bearing inner cone and drive pinion
adjusting washer.
Tool number: ST30031000
SPD011
SPD213A
SPD687
SPD563
SPD018
DISASSEMBLYH233B
Differential Carrier (Cont'd)
PD-58

Differential Case
1. Remove side bearing inner cones.
To prevent damage to bearing, engage puller jaws in groove.
Tool numbers:
VAST33051001
VBST33061000
Be careful not to confuse the left and right hand parts.
2. Spread out lock straps and 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.
SPD207A
SPD022
SPD689
SPD024
SPD716
DISASSEMBLYH233B
PD-59

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 bearings for wear, scratches, pitting or flaking.
Check tapered roller bearing for smooth rotation. If damaged,
replace outer race and inner cone as a set.
SPD717
SPD715
INSPECTIONH233B
PD-60

CAUTION:
Do not run engine when only one wheel (rear) is off the
ground.
Preparation for Disassembly
CHECKING DIFFERENTIAL TORQUE
Measure differential torque with Tools.
If it is not within the specifications, inspect components of limited
slip differential.
Differential torque:
201 - 240 N´m
(20.5 - 24.5 kg-m, 148 - 177 ft-lb)
Tool numbers:
VAKV38105210
VBKV38105220
Disassembly
1. Remove side bearing inner cone with Tool.
2. Loosen ring gear bolts in a criss-cross fashion.
3. Tap ring gear off gear case with a soft hammer.
Tap evenly all around to keep ring gear from binding.
SPD423A
SPD415
SPD424A
LIMITED SLIP DIFFERENTIALH233B
PD-61

4. Remove couple bolts on differential cases A and B with a
press.
Tool number: ST33081000
5. Separate differential cases A and B.
Draw out component parts (discs and plates, etc.).
Put marks on differential cases so that they can be rein-
stalled in their original positions.
Inspection
CONTACT SURFACES
1. Clean the disassembled parts in suitable solvent and blow
dry with compressed air.
2. If the following surfaces are found with burrs or scratches,
smooth with oil stone.
V1Differential case B
V2Differential case A
V3Side gear
V4Pinion mate gear
V5Pinion mate shaft
V6Thrust block
V7Friction plate guide
DISC AND PLATE
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.
3. Check friction discs or plates for warpage.
Allowable warpage:
0.08 mm (0.0031 in)
If it exceeds limits, replace with a new disc or plate to elimi-
nate possibility of clutch slippage or sticking.
SPD420A
SPD291
SPD279
LIMITED SLIP DIFFERENTIALH233B
Disassembly (Cont'd)
PD-62

4. Measure frictional surfaces and projected portions of friction
discs, plates, spring disc and plate.
If any part has worn beyond the wear limit, 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
Adjustment
FRICTION DISC AND FRICTION PLATE END PLAY
End play of friction disc and friction plate can be calculated by
using the following equation and should be adjusted within the
following range.
Adjustment can be made by selecting friction disc having two
different thicknesses.
End play E:
0.05 - 0.15 mm (0.0020 - 0.0059 in)
E=Aþ(B+C)
A: Length of differential case contact surface to differen-
tial 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)
SPD421A
SPD428A
SPD417
LIMITED SLIP DIFFERENTIALH233B
Inspection (Cont'd)
PD-63