INFINITI QX56 2006 Factory Service Manual

FFD-8
FRONT OIL SEAL
Revision: November 20092006 QX56
FRONT OIL SEALPFP:38189
Removal and InstallationEDS00453
REMOVAL
1. Remove the drive shafts from the front final drive assembly. Refer to FA X - 7 , "Removal and Installation" .
2. Remove the front propeller shaft from the front final drive assembly. Refer to PR-4, "
Removal and Installa-
tion" .
3. Measure the total preload torque. Refer to FFD-15, "
Total Preload Torque" .
NOTE:
Record the total preload torque measurement.
4. Remove the drive pinion lock nut using Tool.
5. Put matching marks on the companion flange and drive pinion using paint.
CAUTION:
Use paint to make the matching marks. Do not damage the
companion flange or drive pinion.
6. Remove companion flange using suitable tool.
7. Place a small hole in the front oil seal case using suitable tool.
8. Remove the front oil seal using Tool as shown. Tool number : KV38108300 ( — )
BDIA0001E
LDIA0171E
LDIA0129E
Tool number : SP8P
LDIA0130E

FRONT OIL SEALFFD-9
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Revision: November 2009 2006 QX56
INSTALLATION
1. Apply multi-purpose grease to the lips of the new front oil seal.
Then drive the new front oil seal in evenly to the gear carrier
using Tool.
CAUTION:

Do not reuse front oil seal.

Do not incline the new front oil seal when installing.

Apply multi-purpose grease to the lips of the new front oil
seal.
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 FFD-14, "
COMPONENTS" .

Do not loosen drive pinion lock nut to adjust the total preload torque. If the drive pinion lock nut
torque or the total preload torque exceeds the specifications, replace the collapsible spacer and
tighten it again to adjust. Refer to FFD-14, "
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 FFD-7, "
DIFFERENTIAL GEAR OIL" .
Tool number : KV38100500 (J-25273)
BDIA0003E
Tool number A: KV38108300 ( — )
B: ST3127S000 (J-25765-A)
Total preload torque: Refer to FFD-15, "
To ta l P r e -
load Torque" .
WDIA0381E

FFD-10
SIDE OIL SEAL
Revision: November 20092006 QX56
SIDE OIL SEALPFP:33142
Removal and InstallationEDS00454
REMOVAL
1. Remove the front final drive assembly. Refer to FFD-12, "REMOVAL" .
2. Remove the differential side shaft and differential side flange using suitable tool.
3. Place a small hole in the side oil seal case using suitable tool.
4. Remove the side oil seal using Tool as shown.
INSTALLATION
1. Apply multi-purpose grease to the lips of the new side oil seal. Then drive the new side oil seal in evenly to the gear carrier using suitable 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. Installation of the remaining components is in the reverse order of removal. CAUTION:
Check the differential gear oil level after installation. Refer to FFD-7, "
DIFFERENTIAL GEAR OIL" .
BDIA0006E
LDIA0129E
Tool number : SP8P
LDIA0130E

CARRIER COVERFFD-11
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Revision: November 2009 2006 QX56
CARRIER COVERPFP:38351
Removal and InstallationEDS00455
REMOVAL
1. Remove the front final drive assembly. Refer to FFD-12, "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 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 FFD-14, "
COMPONENTS" .
3. Install the front final drive assembly. Refer to FFD-12, "
Removal
and Installation" .
CAUTION:
Fill the front final drive assembly with recommended differential gear oil. Refer to FFD-7, "
DIFFER-
ENTIAL GEAR OIL" .
Tool number : KV10111100 (J-37228)
PDIA0699E
SDIA3204E

FFD-12
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
FRONT FINAL DRIVE ASSEMBLYPFP:38500
Removal and InstallationEDS00456
REMOVAL
1. Drain the differential gear oil. Refer to FFD-7, "DIFFERENTIAL GEAR OIL" .
2. Remove the drive shafts from the front final drive assembly. Refer to FA X - 7 , "
Removal and Installation" .
3. Remove the front cross member.
4. Remove the front propeller shaft from the front final drive assembly. Refer to PR-4, "
Removal and Installa-
tion" .
5. Disconnect the vent hose from the front final drive assembly.
6. Support the front final drive assembly using a suitable jack.
1. Front final drive assembly 2. Front cross member 3. Skid plate (if equipped)
SDIA3220E

FRONT FINAL DRIVE ASSEMBLYFFD-13
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Revision: November 2009 2006 QX56
7. Remove the front final drive assembly bolts, then remove the
front final drive assembly.
CAUTION:
Support the front final drive assembly while removing using
a suitable jack.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

Make sure there are no pinched or restricted areas on the breather hose caused by folding or
bending when installing it.

Fill the front final drive assembly with differential gear oil after installation. Refer to FFD-7, "DIF-
FERENTIAL GEAR OIL" .
BDIA0008E

FFD-14
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
Disassembly and AssemblyEDS00457
COMPONENTS
1. Side bearing adjuster2. Side bearing 3. Side gear thrust washer
4. Side gear 5. Lock pin 6. Pinion mate thrust washer
7. Pinion mate gear 8. Pinion mate shaft 9. Drive pinion
10. Drive pinion height adjusting washer 11. Drive pinion rear bearing 12. Collapsible spacer
13. Breather tube 14. Differential side flange 15. Dust shield
16. Circular clip 17. Side oil seal 18. Drive pinion front bearing
19. Front oil seal 20. Companion flange 21. Drive pinion lock nut
22. Drain plug 23. Differential side shaft 24. Differential side shaft bearing
25. Extension tube 26. O-ring 27. Gear carrier
28. Plate 29. Differential case 30. Drive gear
31. Side bearing cap 32. Filler plug 33. Carrier cover
SDIA3207E

FRONT FINAL DRIVE ASSEMBLYFFD-15
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Revision: November 2009 2006 QX56
ASSEMBLY INSPECTION AND ADJUSTMENT

Drain the differential gear oil before inspection and adjustment. Refer to FFD-7, "DIFFERENTIAL GEAR
OIL" .

Remove and install the carrier cover as necessary for inspection and adjustment. Refer to FFD-11, "CAR-
RIER COVER" .
Total Preload Torque
1. Install the differential side shaft and differential side flange if necessary.
CAUTION:
The differential side shaft and differential side flange must be installed 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 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.
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.
34. Bushing 35. Bearing36 Screw
37 Dowel pin
Tool number : ST3127S000 (J-25765-A)
Total preload torque: 2.98 - 4.76 N·m (0.31 - 0.48 kg-m, 27 - 42 in-lb)
PDIA0697E
If the total preload torque is greater than specificationOn drive pinion bearings: Replace the collapsible spacer.
On side bearings: Loosen the side bearing adjuster by the same amount on each side.
If the total preload torque is less than specification On drive pinion bearings: Tighten the drive pinion lock nut.
On side bearings: Tighten the side bearing adjuster by the same amount on each side.
Runout limit: 0.08 mm (0.0031 in) or less
SPD886

FFD-16
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
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 drive pinion height (dimension X).

If the tooth contact is near the face (face contact), or near the
heel (heel contact), use a thicker drive pinion height adjusting
washer to move drive pinion closer to the drive gear.
Refer to FFD-32, "
Drive Pinion Height Adjusting Washer" .
SPD357
SDIA0570E
SDIA0517E
PDIA0440E

FRONT FINAL DRIVE ASSEMBLYFFD-17
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If the tooth contact is near the flank (flank contact), or near the
toe (toe contact), use a thinner drive pinion height adjusting
washer to move the drive pinion farther from the drive gear.
Refer to FFD-32, "
Drive Pinion Height Adjusting Washer" .
Backlash
1. Fit a dial indicator to the drive gear face to measure the back-
lash.

If the backlash is outside of the specification, adjust each side
bearing adjuster.
CAUTION:
Do not change the side bearing adjusters by different
amounts as it will change the side bearing preload torque.
Companion Flange Runout
1. Rotate companion flange and check for runout on the compan-ion flange face (inner side of the bolt holes) and companion
flange inner side (socket diameter) using suitable tool.
2. If the runout is outside the runout limit, follow the procedure below to adjust.
a. Rotate the companion flange on the drive pinion by 90 °, 180 °
and 270 ° while checking for the position where the runout is
minimum.
b. If the runout is still outside of the runout limit after the companion flange has been rotated on the drive pin- ion, possible cause could be an assembly malfunction of drive pinion and drive pinion bearing or a mal-
functioning drive pinion bearing.
c. If the runout is still outside of the runout limit after repair of the assembly of drive pinion and drive pinion bearing or drive pinion bearing, replace the companion flange.
PDIA0441E
Backlash: 0.12 - 0.20 mm (0.0050 - 0.0079 in)
SPD513
If the backlash is greater than specification:
Loosen side bearing adjuster A and tighten side bear-
ing adjuster B by the same amount.
If the backlash is less than specification: Loosen side bearing adjuster B and tighten side bear-
ing adjuster A by the same amount.
SDIA2262E
Runout limit Companion flange face: 0.10 mm (0.0039 in)
Companion flange inner side: 0.13 mm (0.0051 in)
SDIA2078E