INFINITI QX4 2001 Factory Service Manual

SMT002DA
8. Set an adapter to sun gear as shown in the figure. Remove sun
gear from planetary carrier. Remove main gear bearing, bear-
ing race and thrust needle bearing (front and rear of planetary
carrier) from sun gear.
SMT003D
9. Remove plug bolt, then remove resist spring and pin.
SMT004D
10. Remove snap ring, and remove internal gear.
IDo not reuse snap ring.
SMT005D
11. Remove front oil seal.
IDo not reuse oil seal.
12. Loosen nut of outer lever assembly to pull out cotter pin, and
remove outer lever.
13. Remove inner lever assembly.
DISASSEMBLY
Front Case (Cont'd)
TF-136

SMT006D
Front Case
INSPECTIONNBTF0080Planetary CarrierNBTF0080S01IMeasure end play of each pinion gear, and make sure the
measurement is within specification shown below. If out of
specification, replace planetary carrier with new one.
Pinion gear end play:
0.1 - 0.7 mm (0.004 - 0.028 in)
ICheck working face of each gear, bearing and others for
damage, burrs, partial wear, dents and other abnormality. If
any is found, replace planetary carrier with new one.
SMT007D
Sun GearNBTF0080S02ICheck if oil passage of sun gear is clogged. For this, try to pass
a 3.6 mm (0.142 in) dia. wire through oil passage as shown in
the figure.
ICheck sliding/contact surface of each gear, bearing and others
for damage, burrs, partial wear, dents, and other abnormality.
If any is found, replace sun gear with new one.
SMT008D
Internal GearNBTF0080S03ICheck internal gear teeth for damage, partial wear, dents and
other abnormality. If any is found, replace internal gear with
new one.
SMT009D
Shift Rod ComponentsNBTF0080S04ICheck working face of shift rod and fork for wear, partial wear,
bending and other abnormality. If any is found, replace with
new one.
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REPAIR FOR COMPONENT PARTS
Front Case
TF-137

SMT010D
IMeasure clearance between shift fork and sleeve. If it is out of
specification, replace it with new one.
Standard value:
Less than 0.36 mm (0.0142 in)
SMT942C
Center Case
INSPECTIONNBTF0081Sub-oil PumpNBTF0081S011. Check inner and outer circumference, tooth face, and side-
face of inner and outer gears for damage or abnormal wear.
2. Measure side clearance between oil pump housing edge and
inner gear/outer gear.
3. Make sure side clearance is within specification. If the mea-
surement is out of specification, replace inner and outer gears
together with new ones as a set.
Specification:
0.015 - 0.035 mm (0.0006 - 0.0014 in)
For inner gear and outer gear, refer to SDS, TF-157.
SMT943C
Main Oil PumpNBTF0081S021. Check inner and outer circumference, tooth face, and side-
face of inner and outer gears for damage or abnormal wear.
2. Measure side clearance between oil pump housing edge and
inner gear/outer gear.
3. Make sure side clearance is within specification. If the mea-
surement is out of specification, replace inner and outer gears
with new ones as a set.
Specification:
0.015 - 0.035 mm (0.0006 - 0.0014 in)
For inner gear and outer gear, refer to SDS, TF-157.
SMT944C
MainshaftNBTF0081S03ICheck surfaces which contact sun gear, clutch drum, clutch
hub, press flange, clutch piston, each bearing, etc. for damage,
peel, partial wear, dents, bending, or other abnormal damage.
If any is found, replace with new one.
REPAIR FOR COMPONENT PARTS
Front Case (Cont'd)
TF-138

SMT945C
Control ValveNBTF0081S04ICheck oil filter screen for damage. If any is found, replace with
new one.
SMT946CA
ICheck resistance between terminals of 4WD solenoid valve,
2-4WD shift solenoid valve and transfer fluid temperature sen-
sor.
Resistance:
Refer to ªCOMPONENT INSPECTIONº, TF-111.
SMT947C
ICheck sliding faces of control valves and plugs for abnormal-
ity. If any is found, replace the control valve assembly with new
one.
CAUTION:
Replace control valve body together with clutch return spring
as a set.
Control valve:
Refer to SDS, TF-157.
SMT948C
ICheck each control valve spring for damage or distortion, and
also check its free length, outer diameter and wire diameter. If
any damage or fatigue is found, replace control valve body with
new one.
IReplace control valve body together with clutch return
spring as a set.
Inspection standard:
Refer to SDS, TF-157.
SMT949C
ClutchNBTF0081S05ICheck drive plate and driven plate facings for damage, cracks
or other abnormality. If any, replace with new one.
ICheck the thickness of drive plate and driven plate facings.
Inspection standard:
Refer to SDS, TF-158.
CAUTION:
IMeasure facing thickness at 3 points to take an average.
ICheck all the drive and driven plates.
ICheck return spring for damage or deformation.
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REPAIR FOR COMPONENT PARTS
Center Case (Cont'd)
TF-139

SMT950C
ICheck stamped mark shown in the figure. Then, check that
free length, outer diameter and wire diameter are within speci-
fications. If any abnormality is found, replace with new return
spring assembly of the same stamped number.
Inspection standard:
Refer to SDS, TF-158.
REPAIR FOR COMPONENT PARTS
Center Case (Cont'd)
TF-140

SMT011D
Front Case
ASSEMBLYNBTF0082Planetary Carrier, Sun Gear and Internal GearNBTF0082S011. Apply ATF to oil seal periphery, and install oil seal so that it is
flush with the end face of front case.
IDo not reuse oil seal.
SMT012D
2. Install internal gear with its groove facing snap ring into front
case. Then secure it with snap ring.
IDo not reuse snap ring.
SMT108D
3. Remove all the liquid gasket on plug bolt and front case. Apply
locking sealant to plug bolt, install it to front case and tighten
it to specified torque.
IWith one crest of plug bolt inserted in the hole, apply liquid
gasket 1215 to the thread.
: 19 - 25 N´m (1.9 - 2.5 kg-m, 14 - 18 ft-lb)
SMT014D
4. Install snap ring to main gear bearing.
IDo not reuse snap rings.
SMT015D
5. Set main gear bearing to front case, then press it.
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ASSEMBLY
Front Case
TF-141

SMT016D
6. Install thrust needle bearing to sun gear.
7. Install sun gear to planetary carrier.
SMT017D
8. Set a support (KV40105500) to bushing replacer puller
(ST30911000) as shown in the figure, and place planetary
carrier on it.
9. Install thrust needle bearing to planetary carrier with its roller
facing front case.
10. Measure ªCº from the end of sun gear to the roller surface of
thrust needle bearing.
SMT018D
11. Measure ªDº from the end of sun gear to the main gear bear-
ing contact surface.
12. Calculate end play ªEº using ªCº and ªDº obtained in steps 10
and 11. Select bearing race so that the end play becomes the
standard value.
Calculation formula:
End play ªEº = ªCº þ ªDº
Standard end play:
0.1 - 0.25 mm (0.0039 - 0.0098 in)
Bearing race:
Refer to SDS, TF-159.
SMT019D
13. Set planetary carrier to press in the status described in step 8.
Then install the selected bearing race to planetary carrier.
SMT020D
14. Install front case to planetary carrier. Set a support ring
(KV40105310) and an adapter B (KV40105230) to main gear
bearing inner race, then press it.
ASSEMBLY
Front Case (Cont'd)
TF-142

SMT021D
15. Install washer to sun gear assembly, and select proper snap
ring so that end play ªFº of sun gear is within specifications.
Standard end play ªFº:
0 - 0.15 mm (0 - 0.0059 in)
Snap ring: Refer to SDS, TF-159.
SMT022D
16. Install the selected snap ring.
IDo not reuse snap rings.
17. Apply ATF to the periphery of new transfer cover oil seal, and
attach it at 1.5 mm (0.059 in) from the transfer cover and face.
IDo not reuse oil seal.
SMT023D
18. Apply sealing fluid (Locktite 518´C1335 x 25) to transfer cover
mounting surface of front case as shown in the figure.
CAUTION:
IRemove all foreign materials such as water, oil, and
grease from mating surfaces of front case and transfer
cover.
IPrevent sealing fluid from entering into oil holes of front
case.
SMT024D
19. Align oil hole of front case with notch of transfer cover, and
tighten bolts.
: 49 - 58 N´m (5.0 - 5.9 kg-m, 36 - 43 ft-lb)
IDo not reuse bolts.
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ASSEMBLY
Front Case (Cont'd)
TF-143

SMT995C
20. Apply petroleum jelly to radial needle bearing, and install it
inside sun gear.
21. Install shift rod assembly to front case assembly. Refer to ªShift
Rod Assemblyº, TF-144.
22. Install center case assembly to front case assembly. Refer to
ªFinal Assemblyº, TF-153.
23. Install rear case assembly to center case. Refer to ªFinal
Assemblyº, TF-153.
SMT994C
Shift Rod AssemblyNBTF0082S021. Install fork guide, shift fork spring, 2-4 fork, and L-H fork to shift
rod, and secure them with roll pins.
IDo not reuse roll pins.
SMT992C
2. Install 2-4 sleeve and L-H sleeve to each fork.
SMT991C
3. While aligning L-H sleeve with planetary carrier, install shift rod
assembly to front case.
SMT990C
4. Remove all the liquid gasket on check plug and front case, and
install check ball and check spring to front case. Apply gasket
fluid 1215 (Three Bond) to check plug, install it to front case,
and tighten it to specified torque.
IWith plug bolt threaded one pitch into the hole, apply gasket
fluid 1215 (Three Bond) to the thread.
: 19 - 25 N´m (1.9 - 2.5 kg-m, 14 - 18 ft-lb)
5. Remove all the liquid gasket on the switch fitting and inner side
of front case, and with wait detection switch threaded one pitch
into the hole, apply gasket fluid 1215 (Three Bond) to the
thread, install it, and tighten it to specified torque.
ASSEMBLY
Front Case (Cont'd)
TF-144

: 15 - 20 N´m (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
IWait detection switch harness connector is black.
6. Install center case assembly to front case assembly. Refer to
ªFinal Assemblyº, TF-153.
7. Install rear case assembly to center case. Refer to ªFinal
Assemblyº, TF-153.
SMT951C
Center Case
ASSEMBLYNBTF0083Oil FilterNBTF0083S011. Apply ATF or petroleum jelly to new O-ring, and install it to oil
filter stud.
IDo not reuse O-rings.
2. Install oil filter stud to center case, and tighten it.
: 25 - 35 N´m (2.6 - 3.6 kg-m, 19 - 26 ft-lb)
SMT939C
3. Apply ATF or petroleum jelly to two new O-rings, and install
them to oil filter.
IDo not reuse O-rings.
4. Install oil filter to center case and tighten bolts.
:7-9N´m(0.7 - 0.9 kg-m, 61 - 78 in-lb)
IDo not knock oil filter with a tool such as a hammer.
SMT935C
Sub-oil PumpNBTF0083S021. Install new oil pump gasket to center case by aligning it with
dowel pin inside the center case.
IDo not reuse gaskets.
SMT936C
2. Install outer gear* and inner gear to sub-oil pump housing, and
measure side clearance. Refer to ªSub-oil Pumpº,
ªINSPECTIONº, TF-138.
3. Set new O-ring to sub-oil pump housing, and install sub-oil
pump cover.
IDo not reuse O-rings.
* Identification mark ªHº is placed on the side of sub-oil pump
cover.
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ASSEMBLY
Front Case (Cont'd)
TF-145