INFINITI QX4 2001 Factory Service Manual

SMT955C
4. Align dowel pin hole and mounting bolt hole of sub-oil pump
assembly with center case. Then tighten bolts.
:7-9N´m(0.7 - 0.9 kg-m, 61 - 78 in-lb)
SMT956C
5. Apply ATF or petroleum jelly to new O-ring and install it to
transfer motor.
6. Fit double-flat end of transfer motor shaft into slot of sub-oil
pump assembly. Then tighten bolts.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
SMT957C
Main Oil PumpNBTF0083S031. Install inner gear and outer gear in the main oil pump housing
with their identification marks facing toward center case
mounting surface side. Then, measure the side clearance.
Refer to ªMain Oil Pumpº, ªCenter Caseº, TF-138.
SMT930C
2. Install main oil pump assembly to center case assembly, and
tighten bolts.
:7-9N´m(0.7 - 0.9 kg-m, 61 - 78 in-lb)
3. Install oil pump shaft to main oil pump, then install rear case
assembly to center case.
Refer to ªFinal Assemblyº, TF-153.
ASSEMBLY
Center Case (Cont'd)
TF-146

SMT928C
SMT926C
Control ValveNBTF0083S041. Clean upper body, control valves and springs with cleaning
agent, and apply air blow.
2. Dip control valves in ATF, and apply ATF to the valve-mount-
ing area of upper body.
3. Install each control valve, spring, and plug to upper body, and
fix it with retainer plates.
CAUTION:
ITo insert control valves into upper body, place upper body
on a level surface in order to prevent flaw or damage.
IMake sure each control valve is smoothly inserted.
4. Install reverse balls, relief balls and relief springs, accumula-
tor pistons, valve springs and two filters to upper body.
SMT925C
5. Install lower body and separator plate to upper body.
IDo not reuse separator plates.
SMT962CA
6. With lower body down, tighten two bolts in the position shown
in the figure.
7. Apply ATF or petroleum jelly to new O-ring, and install it to
2-4WD shift solenoid valve, terminal body, line pressure switch
and 4WD solenoid valve. Install them to control valve assem-
bly.
IDo not reuse O-rings.
SMT922CA
8. Apply ATF or petroleum jelly to lip seals, and install them to
center case.
IDo not reuse lip seals.
IThere are 2 kinds of lip seals (lip seal of large inner diam-
eter: 5 pieces, lip seal of small inner diameter: 2 pieces).
Confirm the position before installation.
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ASSEMBLY
Center Case (Cont'd)
TF-147

SMT911D
9. Install bolts as shown in the figure, and tighten them to speci-
fied torque.
Bolt symbol a b *c d e f
Length under head
mm (in)38
(1.50)43.5
(1.713)62
(2.44)19
(0.75)52
(2.05)47
(1.85)
Q'ty 1732111
Tightening torque
N´m (kg-m, in-lb)6.9 - 8.8 (0.70 - 0.90, 61.1 - 77.9)
*: Tighten with oil strainer.
SMT920C
10. Install control valve assembly to center case, and tighten bolts.
: 6.9 - 8.8 N´m (0.70 - 0.90 kg-m, 61.1 - 77.9 in-lb)
SMT921C
11. Secure terminal body with snap ring.
SMT919C
12. Apply ATF or petroleum jelly to O-rings, and install them to oil
strainer.
CAUTION:
Do not reuse snap ring.
13. Install oil strainer to control valve assembly.
14. Install mainshaft and clutch drum to center case. Refer to
ªMainshaft and Clutch Drumº, TF-149.
15. Install front case assembly and rear case assembly. Refer to
ªFinal Assemblyº, TF-153.
SMT917C
Clutch PistonNBTF0083S051. Apply ATF to D-ring and lip seal, and install them to clutch pis-
ton.
ASSEMBLY
Center Case (Cont'd)
TF-148

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

SMT974C
5. Install clutch drum, needle bearing and clutch hub to
mainshaft, and secure them with snap ring.
IDo not reuse snap ring.
SMT975C
6. Install each clutch to clutch drum.
SMT911C
7. Align the notch of return spring assembly with the pin of clutch
hub, and install it.
SMT977C
8. Install press flange (with the holes indicated by arrows aligned
with pins of clutch hub).
SMT909C
9. Install washer.
ASSEMBLY
Center Case (Cont'd)
TF-150

SMT907C
10. Pass mainshaft through snap ring. Set a drift (KV31103300),
a support ring (KV40104710), a support ring (ST27863000)
and a drift (ST35271000) to press flange at the position shown
in the figure, and press snap ring until it fits into snap ring
groove on mainshaft.
IDo not reuse snap ring.
SMT908C
11. Fix snap ring to mainshaft.
SMT905C
12. Install thrust needle bearing to press flange.
SMT982C
13. Apply petroleum jelly to new seal rings, and install them to
mainshaft. Measure clearance between seal ring and groove
using feeler gauge.
Standard clearance:
0.05 - 0.30 mm (0.0020 - 0.0118 in)
Limit clearance:
0.30 mm (0.0118 in)
IPass seal ring from mainshaft rear end to install it.
Seal ring dimension:
Refer to SDS, TF-159.
SMT983C
14. Install mainshaft rear bearing to center case.
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ASSEMBLY
Center Case (Cont'd)
TF-151

SMT984C
15. Place puller (ST30911000) to mainshaft rear bearing inner
race, and set it to press stand.
16. Place adapter (ST33061000) to the tip of mainshaft, and press
mainshaft into center case.
SMT903CA
17. Install baffle plate to center case, and tighten bolts.
: 3.7 - 5.0 N´m (0.38 - 0.51 kg-m, 33.0 - 44.3 in-lb)
18. Install front drive shaft and drive chain. Refer to ªFront Drive
Shaft and Drive Chainº below.
19. Install front case assembly and rear case assembly.
Refer to ªFinal Assemblyº, TF-153.
SMT986C
Front Drive Shaft and Drive ChainNBTF0083S071. Place a base (ST30032000) to front drive shaft rear bearing
inner race, and press it using a drift (KV40100621).
SMT987C
2. Place base (ST30032000) to front drive shaft front bearing
inner race, and press it using the drift (KV40100621).
SMT988C
3. Install drive chain temporarily to front drive shaft and drive gear
of clutch drum.
4. Tap front drive shaft with a plastic hammer while keeping it
upright and press-fit front drive shaft rear bearing.
IBe careful not to tap drive chain with a hammer.
ASSEMBLY
Center Case (Cont'd)
TF-152

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

SMT894C
4. Make sure the two claws of oil gutter are securely attached to
slots in center case.
SMT895C
5. With the claws of oil gutter held by a finger, install center case
assembly to front case assembly.
CAUTION:
Pay careful attention so that mainshaft end does not damage
radial needle bearing in sun gear assembly.
6. Tap center case lightly with a rubber hammer or the like and
press-fit front drive shaft bearing into front case.
SMT896C
7. Make sure oil gutter rear end protrudes from point ªAº in the
figure.
8. Tighten bolts to specified torque.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
IBe sure to install air breather hose clamp, connector
bracket and harness clip.
SMT883C
9. Fit double-flat end of oil pump shaft into slot of main oil pump
and install it.
NOTE:
When oil pump shaft is rotated slightly, it drops into position where
both parts fit.
SMT884C
10. Install stem bleeder to center case.
ASSEMBLY
Final Assembly (Cont'd)
TF-154

SMT881C
11. Remove rear oil seal.
IDo not reuse oil seal.
SMT882C
12. Apply ATF to the circumference of new rear oil seal, and tap it
using a drift as shown in the figure so that it is aligned with
case tip face.
IApply multi-purpose grease to oil seal lip.
SMT879C
13. Apply sealing fluid 518 (Locktite) to entire rear case mounting
surface of center case as shown in the figure.
CAUTION:
IRemove all foreign materials such as water, oil, and
grease from center case and rear case mating surfaces.
IBe careful not to allow sealing fluid to clog bleeder hole.
14. Install rear case to center case, and tighten bolts to specified
torque.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
IBe sure to attach harness clips.
SMT880C
15. Remove all the gasket fluid 1215 (Three Bond) from switch
mounting area and inside rear case, with ATP switch and neu-
tral-4LO switch threaded in 1 to 2 pitches, apply gasket fluid
1215 (Three Bond) to the thread of the switches and tighten it
to specified torque.
: 15 - 20 N´m (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
16. Install rear case assembly to center case assembly.
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ASSEMBLY
Final Assembly (Cont'd)
TF-155