2001 INFINITI QX4 check oil

SMT811D
55. Thrust needle bearing race
56. Clutch piston
57. D-ring
58. Lip seal
59. Oil gutter
60. Center case
61. Stem bleeder
62. Mainshaft rear bearing
63. Thrust washer
64. Speedometer drive gear
65. Snap ring
66. Rear case
67. ATP switch
68. Neutral-4LO switch69. Oil seal
70. Magnet
71. Baffle plate
72. Oil strainer
73. O-ring
74. Control valve assembly
75. Lip seal (7 pieces)
76. Filler plug
77. Inner gear
78. Outer gear
79. Oil pump housing
80. Bushing
81. Oil pump shaft
82. Oil pressure check plug83. Oil pump gasket
84. Sub-oil pump housing
85. Outer gear
86. Inner gear
87. O-ring
88. Sub-oil pump cover
89. O-ring
90. Transfer motor
91. O-ring
92. Oil filter stud
93. O-ring
94. O-ring
95. Oil filter
OVERHAUL
Transfer Components (Cont'd)
TF-122

SMT915C
Clutch PistonNBTF0078S031. Remove oil pressure check plug from oil pressure check port.
SMT916C
2. Apply air gradually from oil pressure check port, and remove
clutch piston from center case.
SMT917C
3. Remove lip seal and D-ring from clutch piston.
IDo not reuse lip seal and D-ring.
4. Remove thrust needle bearing race from clutch piston by hook-
ing a screwdriver edge into 4 notches of thrust needle bearing
race.
Control ValveNBTF0078S04CAUTION:
IDo not reuse any part that has been dropped or damaged.
IMake sure valve is assembled in the proper direction.
IDo not use a magnet because residual magnetism stays
during disassembly.
SMT918C
1. Remove bolts, and detach oil strainer.
DISASSEMBLY
Center Case (Cont'd)
TF-128

SMT939C
3. Remove O-rings from oil filter.
IDo not reuse O-rings.
SMT940C
4. Remove oil filter stud.
SMT941C
5. Remove O-ring from oil filter stud.
IDo not reuse O-ring.
SMT895C
Front Case
DISASSEMBLYNBTF00791. Remove rear case from center case. Refer to TF-123.
2. Remove front case from center case.
SMT990C
Shift Rod ComponentsNBTF0079S011. Remove check plug, then check spring and check ball.
2. Remove wait detection switch.
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DISASSEMBLY
Center Case (Cont'd)
TF-133

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

SMT969C
2. Set clutch piston to a clutch piston attachment (KV31103400).
SMT970C
3. Set the clutch piston attachment to center case, and install
clutch piston, tap it lightly.
4. Install slide needle bearing race to clutch piston.
SMT915C
5. Remove all the liquid gasket from oil pressure check port and
inside center case. With oil pressure check plug threaded in 1
or 2 pitches, apply gasket fluid 1215 (Three Bond) to the thread
of plug, and tighten.
: 10 - 17 N´m (1.0 - 1.7 kg-m, 87 - 148 in-lb)
6. Install mainshaft and clutch drum. Refer to ªMainshaft and
Clutch Drumº, TF-149.
SMT972C
Mainshaft and Clutch DrumNBTF0083S061. Install drive plates, driven plates and press flange to clutch
hub.
2. Place clutch hub on a surface plate and measure dimension
ªAº between snap ring mounting surface of press flange and
clutch drum sliding face of clutch hub.
CAUTION:
Measure at least 2 points, and take an average.
SMT973C
3. Measure dimension ªBº between the gear end of mainshaft
and the snap ring mounting portion.
4. Calculate end play using dimension ªAº and dimension ªBº
(obtained in steps 2 and 3), and select proper retaining plate
so that the end play is within specifications.
Calculation formula:
End play = B þ A þ Retaining plate thickness
Standard end play:
0.2 - 0.5 mm (0.008 - 0.020 in)
Retaining plate:
Refer to SDS, TF-158.
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ASSEMBLY
Center Case (Cont'd)
TF-149

SMT989C
5. Align claw of oil gutter with center case, and install it.
6. Install front case assembly and rear case assembly.
Refer to ªFinal Assemblyº, TF-153.
SMT891C
Final AssemblyNBTF00841. Install C-rings to mainshaft rear bearing.
SMT889C
2. Check speedometer drive gear teeth for abnormal wear. Set
speedometer drive gear properly on mainshaft, and secure it
with snap ring.
IDo not reuse snap ring.
SMT893C
3. Apply sealing fluid 518 (Locktite) to the entire center case
mounting surface of front case as shown in the figure.
CAUTION:
Remove all foreign materials such as water, oil and grease
from center case and front case mating surfaces.
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ASSEMBLY
Center Case (Cont'd)
TF-153