2006 INFINITI QX56 differential

RFD-8
DIFFERENTIAL GEAR OIL
Revision: November 20092006 QX56
DIFFERENTIAL GEAR OILPFP:KLD30
Changing Differential Gear OilEDS0044O
DRAINING
1. Stop the engine.
2. Remove the drain plug and gasket from the rear final drive
assembly to drain the differential gear oil.
3. Install the drain plug with a new gasket to the rear final drive assembly. Tighten to the specified torque. Refer to RFD-15,
"COMPONENTS" .
CAUTION:
Do not reuse gasket.
FILLING
1. Remove the filler plug and gasket from the rear final drive assembly.
2. Fill the rear final drive assembly with new differential gear oil until the level reaches the specified level near the filler plug hole.
3. Install the filler plug with a new gasket on it to the rear final drive assembly. Tighten to the specified torque. Refer to RFD-15,
"COMPONENTS" .
CAUTION:
Do not reuse gasket.
Checking Differential Gear OilEDS0044P
OIL LEAKAGE AND OIL LEVEL
1. Make sure that differential gear oil is not leaking from the rear final drive assembly or around it.
2. Check the differential gear oil level from the filler plug hole as shown.
CAUTION:
Do not start engine while checking differential gear oil level.
3. Install the filler plug with a new gasket on it to the rear final drive assembly. Tighten to the specified torque. Refer to RFD-15,
"COMPONENTS" .
CAUTION:
Do not reuse gasket.
LLIA0068E
Differential gear oil
grade and capacity : Refer to
MA-11, "Fluids
and Lubricants" .
LLIA0068E
LLIA0068E

RFD-10
FRONT OIL SEAL
Revision: November 20092006 QX56
2. Install the companion flange to the drive pinion while aligning the matching marks.
3. Apply anti-corrosive oil to the threads of the drive pinion and the
seating surface of the new drive pinion lock nut. Then adjust the
drive pinion lock nut tightening torque using Tool A, and check
the total preload torque using Tool B.

The total preload torque should be within the total preload
torque specification. When not replacing the collapsible
spacer, it should also be equal to the measurement taken dur-
ing removal plus an additional 0.56 N·m (0.06 Kg-m, 5 in-lb).

If the total preload torque is low, tighten the drive pinion lock
nut in 6.8 N·m (0.69 Kg-m, 5ft-lb) increments until the total
preload torque is met.
CAUTION:

Do not reuse drive pinion lock nut.

Apply anti-corrosive oil to the threads of the drive pinion
and the seating surface of the new drive pinion lock nut.

Adjust the drive pinion lock nut tightening torque to the
lower limit first. Do not exceed the drive pinion lock nut
specified torque. Refer to RFD-15, "
COMPONENTS" .

Do not loosen drive pinion lock nut to adjust the total preload torque. If the total preload torque
exceeds the specifications, replace the collapsible spacer and tighten it again to adjust. Refer to
RFD-15, "
Disassembly and Assembly" .

After adjustment, rotate drive pinion back and forth 2 to 3 times to check for unusual noise, rota-
tion malfunction, and other malfunctions.
4. Installation of the remaining components is in the reverse order of removal.
CAUTION:
Check the differential gear oil level after installation. Refer to RFD-8, "
Checking Differential Gear
Oil" .
Tool number A: KV40104000 ( — )
B: ST3127S000 (J-25765-A)
Total preload torque: Refer to RFD-16, "
To ta l P r e l o a d
To r q u e" .
WDIA0380E

SIDE OIL SEALRFD-11
CE F
G H
I
J
K L
M A
B
RFD
Revision: November 2009 2006 QX56
SIDE OIL SEALPFP:33142
Removal and InstallationEDS0044R
REMOVAL
1. Remove the drive shaft from the rear final drive assembly. Refer to RAX-7, "Removal and Installation" .
2. Remove the side flange using Tools.
3. Remove the side oil seal using suitable tool. CAUTION:
Do not to damage gear carrier.
INSTALLATION
1. Apply multi-purpose grease to the lips of the new side oil seal.Then drive the new side oil seal in evenly until it becomes flush
with the gear carrier using Tool.
CAUTION:

Do not reuse side oil seal.

Do not incline the new side oil seal when installing.

Apply multi-purpose grease to the lips of the new side oil
seal.
2. Install the side flange using Tool.
a. Install the Tool to the side oil seal as shown.
b. Insert the side flange until the serrated part of the side flange has engaged the serrated part of the side gear and remove the
To o l .
c. Drive in the side flange using suitable tool. NOTE:
Installation is completed when the driving sound of the side
flange turns into a sound which seems to affect the whole rear
final drive assembly.
3. Installation of the remaining components is in the reverse order of removal.
CAUTION:
Check the differential gear oil level after installation. Refer to RFD-8, "
Checking Differential Gear
Oil" .
Tool numbers A: KV40104100 ( — )
B: ST36230000 (J-25840-A)
WDIA0115E
LDIA0109E
Tool number : ST35271000 ( — )
LDIA0111E
Tool number : KV38107900 (J-39352)
SDIA0822E

RFD-12
CARRIER COVER
Revision: November 20092006 QX56
CARRIER COVERPFP:38351
Removal and InstallationEDS0044S
REMOVAL
1. Remove the rear final drive assembly. Refer to RFD-13, "Removal and Installation" .
2. Remove the carrier cover bolts and separate the carrier cover from the gear carrier using Tool.
CAUTION:

Do not damage the mating surface.

Do not insert flat-bladed screwdriver, this will damage the
mating surface.
INSTALLATION
1. Apply a 3 mm (0.12 in) bead of sealant to the mating surface ofthe carrier cover as shown.

Use Genuine Silicone RTV or equivalent. Refer to GI-46,
"Recommended Chemical Products and Sealants" .
CAUTION:
Remove any old sealant adhering to the mating surfaces.
Also remove any moisture, oil, or foreign material adhering
to the application and mating surfaces.
2. Install the carrier cover to the gear carrier. Tighten the bolts to the specified torque. Refer to RFD-15, "
COMPONENTS" .
3. Install the rear final drive assembly. Refer to RFD-13, "
Removal
and Installation" .
CAUTION:
Fill the rear final drive assembly with recommended differential gear oil. Refer to RFD-8, "
DIFFER-
ENTIAL GEAR OIL" .
Tool number : KV10111100 (J-37228)
WDIA0123E
WDIA0282E

REAR FINAL DRIVE ASSEMBLYRFD-13
CE F
G H
I
J
K L
M A
B
RFD
Revision: November 2009 2006 QX56
REAR FINAL DRIVE ASSEMBLYPFP:38300
Removal and InstallationEDS0044T
REMOVAL
1. Remove the spare tire.
2. Drain the differential gear oil. Refer to FFD-7, "
DIFFERENTIAL GEAR OIL" .
3. Remove the rear stabilizer bar. Refer to RSU-42, "
Removal and Installation" .
4. Remove the rear propeller shaft. Refer to PR-8, "
Removal and Installation" .
5. Remove the rear drive shafts from the rear final drive assembly and support them using suitable wire. Refer to RAX-7, "
Removal
and Installation" .
6. Disconnect the breather hose from the rear final drive assembly.
1. Breather hose 2. Rear final drive assembly3. Rear propeller shaft
4. Washer 5. Lower stopper6. Rear drive shaft
7. Rear final drive assembly 8. Upper stopper⇐Vehicle front
WDIA0375E
LDIA0164E

RFD-14
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
7. Place a suitable jack under the rear final drive assembly.
CAUTION:
Do not place the jack on the carrier cover.
8. Remove the nuts and bolts and remove the rear final drive assembly.
CAUTION:
Secure rear final drive assembly to the jack while removing
it.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

When installing the breather hose make sure the painted marking on the metal end of breather
hose is to the front of the vehicle and there are no pinched or restricted areas on the breather
hose caused by folding or bending when installing it.

When installing the breather hose insert the plastic end of the breather hose into the hole in the
suspension member.

Fill the rear final drive assembly with differential gear oil after installation. Refer to RFD-8, "DIF-
FERENTIAL GEAR OIL" .
WDIA0117E

RFD-16
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
ASSEMBLY INSPECTION AND ADJUSTMENT

Drain the differential gear oil before inspection and adjustment. Refer to RFD-8, "DIFFERENTIAL GEAR
OIL" .

Remove and install the carrier cover as necessary for inspection and adjustment. Refer to RFD-12, "CAR-
RIER COVER" .
Total Preload Torque
1. Remove the side flanges if necessary. Refer to RFD-19, "Side Flange" .
CAUTION:
The side flanges shaft must removed in order to measure total preload torque.
2. Rotate the drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.
3. Rotate the drive pinion at least 20 times to check for smooth operation of the bearings.
4. Measure the total preload torque using Tool.
NOTE:
Total preload torque = Drive pinion bearing preload torque +
Side bearing preload torque

If the measured value is out of the specification, check and adjust each part. Adjust the drive pinion
bearing preload torque first, then adjust the side bearing preload torque.
CAUTION:
Select a side bearing adjusting washer for right and left individually.
1. Drive pinion lock nut 2. Companion flange 3. Front oil seal
4. Drive pinion front bearing 5. Collapsible spacer 6. Drive pinion rear bearing
7. Drive pinion height adjusting washer 8. Drive pinion 9. Gear carrier
10. Drive gear 11. Pinion mate shaft 12. Lock pin
13. Pinion mate gear 14. Pinion mate thrust washer 15. Side gear
16. Side gear thrust washer 17. Differential case 18. Side bearing
19. Side bearing adjusting washer 20. Bearing cap 21. Carrier cover
22. Filler plug 23. Drain plug 24. Side oil seal
Tool number : ST3127S000 (J-25765-A)
Total preload torque:
2.05 - 4.11 N·m (0.21 - 0.42 kg-m, 19 - 36 in-lb)
SPD884
If the total preload torque is greater than specificationOn drive pinion bearings: Replace the collapsible spacer.
On side bearings: Use thinner side bearing adjusting washers by the same amount on each side. Refer to RFD-33, "
Side Bearing Adjusting
Washer" .
If the total preload torque is less than specification On drive pinion bearings: Tighten the drive pinion lock nut.
On side bearings: Use thicker side bearing adjusting washers by the same amount on each side. Refer to RFD-33, "
Side Bearing Adjust-
ing Washer" .

REAR FINAL DRIVE ASSEMBLYRFD-17
CE F
G H
I
J
K L
M A
B
RFD
Revision: November 2009 2006 QX56
Drive Gear Runout
1. Fit a dial indicator to the drive gear back face.
2. Rotate the drive gear to measure runout.

If the runout is outside of the limit, check the condition of the
drive gear assembly. Foreign material may be caught between
the drive gear and differential case, or the differential case or
drive gear may be deformed.
CAUTION:
Replace drive gear and drive pinion as a set.
Tooth Contact
1. Apply red lead to the drive gear.
NOTE:
Apply red lead to both faces of three to four gears, at four loca-
tions evenly spaced on the drive gear.
2. Rotate the drive gear back and forth several times. Then check for correct drive pinion to drive gear tooth contact as shown.
CAUTION:
Check tooth contact on drive side and reverse side.
3. If the tooth contact is improperly adjusted, follow the procedure below to adjust the pinion height (dimension X).Runout limit : 0.05 mm (0.0020 in) or less
SPD886
SPD357
SDIA0570E
SDIA0517E