2007 INFINITI QX56 differential

RFD-16
< SERVICE INFORMATION >
REAR FINAL DRIVE ASSEMBLY
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
WDIA0191E

REAR FINAL DRIVE ASSEMBLY
RFD-17
< SERVICE INFORMATION >
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ASSEMBLY INSPECTION AND ADJUSTMENT
• Drain the differential gear oil before inspection and adjustment. Refer to RFD-8.
• Remove and install the carrier cover as necessary for inspection and adjustment. Refer to RFD-13
.
Total Preload Torque
1. Remove the side flanges if necessary.
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.
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
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 specification
On 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-32, "
Inspection and Adjust-
ment".
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-32, "
Inspection and Adjust-
ment".
Runout limit : 0.05 mm (0.0020 in) or less
SPD886

REAR FINAL DRIVE ASSEMBLY
RFD-19
< SERVICE INFORMATION >
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P Backlash
1. Fit a dial indicator to the drive gear face to measure the back-
lash.
• If the backlash is outside of the specification, change the thickness
of the side bearing adjusting washers.
CAUTION:
Do not change the total thickness of side bearing adjusting washers as it will change the side bearing
preload torque.
Companion Flange Runout
1. Rotate companion flange and check for runout on the outer face
of the companion flange using suitable tool.
2. If the runout is outside of 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 pinion, possible cause
could be an assembly malfunction of drive pinion and drive pinion bearing or a malfunctioning 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.
DISASSEMBLY
Side Flange
1. Drain the differential gear oil if necessary.
2. Remove the side flange using Tools.
3. Remove the side oil seal using suitable tool.
CAUTION:
Do not to damage gear carrier.
Differential Assembly
1. Remove the side flanges.
2. Remove the carrier cover bolts.Backlash : 0.13 - 0.18 mm (0.0051 - 0.0070 in)
If the backlash is greater than specification:
Make side bearing adjusting washer thicker on drive
gear back side, and side bearing adjusting washer
thinner on drive gear tooth side by the same amount.
Refer to RFD-32, "
Inspection and Adjustment".
If the backlash is less than specification:
Make side bearing adjusting washer thinner on drive
gear back side, and side bearing adjusting washer
thicker on drive gear tooth side by the same amount.
Refer to RFD-32, "
Inspection and Adjustment".
SPD513
Runout limit : 0.08 mm (0.0031 in) or less
WDIA0231E
Tool numbers A: KV40104100 ( — )
B: ST36230000 (J-25840-A)

RFD-20
< SERVICE INFORMATION >
REAR FINAL DRIVE ASSEMBLY
3. 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.
4. Mount the carrier on the Tool using two 45 mm (1.77 in) spacers.
5. For proper reinstallation, paint matching marks on one side of
the side bearing cap and gear carrier.
CAUTION:
• For matching marks, use paint. Do not damage side bear-
ing cap or gear carrier.
• Side bearing caps are line-board during manufacture. The
matching marks are used to reinstall them in their original
positions.
6. Remove the side bearing caps.
7. Lift the differential case assembly out using Tool.Tool number : KV10111100 (J-37228)
WDIA0123E
Tool number : KV38100800 (J-25604-01)
SPD888
SDIA1795E
S-PD343
Tool number : HT72400000 ( — )
S-PD344

REAR FINAL DRIVE ASSEMBLY
RFD-21
< SERVICE INFORMATION >
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CAUTION:
• Keep side bearing outer races together with inner race.
Do not mix them up.
• Keep side bearing adjusting washers together with side
bearings.
8. Remove the side bearing inner races using Tools.
CAUTION:
• Engage Tool jaws in bearing groove to prevent damage.
• Place copper plates between the side bearing and drive
gear and the vise to prevent damage.
• Do not remove side bearing inner race unless it is being
replaced.
9. For proper reinstallation, paint matching marks on the differential
case and drive gear.
CAUTION:
Use paint for matching marks. Do not damage differential
case or drive gear.
10. Remove the drive gear bolts.
11. Tap the drive gear off the differential case using suitable tool.
CAUTION:
Tap evenly all around to keep drive gear from bending.
12. Remove the lock pin of the pinion mate shaft from the drive gear
side using suitable tool.
SPD919
Tool number A: ST3306S001 ( — )
B: ST33061000 (J-8107-2)
SPD920
PDIA0496E
WDIA0132E

RFD-22
< SERVICE INFORMATION >
REAR FINAL DRIVE ASSEMBLY
13. Remove the pinion mate shaft.
14. Turn the pinion mate gear, then remove the pinion mate gear,
pinion mate thrust washer, side gear and side gear thrust
washer from the differential case.
Drive Pinion Assembly
1. Remove the differential assembly.
2. Remove the drive pinion lock nut using Tool.
3. 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.
4. Remove the companion flange using suitable tool.
SDIA0031J
SDIA0032J
Tool number : KV40104000 ( — )
SDIA1144E
SDIA1132E

RFD-24
< SERVICE INFORMATION >
REAR FINAL DRIVE ASSEMBLY
Gear Carrier
• If any wear or cracks are found on the contact sides of gear carrier, replace with new one.
Companion Flange
• If any chips (about 0.1mm, 0.004 in) or other damage on the companion flange surface which contacts the
front oil seal lips are found, replace with new one.
ADJUSTING AND SELECTING WASHERS
Side Gear Back Clearance
• Assemble the differential parts if they are disassembled.
1. Place the differential case straight up so that the side gear to be
measured is upward.
2. Using feeler gauges, measure the clearance between the side
gear back and differential case at three different points, while
rotating the side gear. Average the three readings to calculate
the clearance. (Measure the clearance of the other side as well.)
• If the side gear back clearance is outside of the specification,
use a thicker or thinner side gear thrust washer to adjust.
Refer to RFD-32, "
Inspection and Adjustment".
CAUTION:
• Insert feeler gauges with the same thickness on both
sides to prevent side gear from tilting.
• Each gear should rotate smoothly without excessive
resistance during differential motion.
• Select a side gear thrust washer for right and left individu-
ally.
NOTE:
Side gear back clearance is clearance between side gear and differential case for adjusting side gear
backlash.
Side Bearing Preload Torque
• A selection of side bearing adjusting washers is required for successful completion of this procedure.
PDIA0460E
Side gear back clearance: 0.20 mm (0.0079 in) or less.
If the side gear back clearance is greater than
specification:
Use a thicker side gear thrust washer.
If the side gear back clearance is less than spec-
ification:
Use a thinner side gear thrust washer.
PDIA0576E

REAR FINAL DRIVE ASSEMBLY
RFD-25
< SERVICE INFORMATION >
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1. Apply differential gear oil to the side bearings, and install the dif-
ferential case assembly with the side bearing outer races into
the gear carrier.
CAUTION:
Do not reuse side bearing outer race when replacing side
bearing inner race (replace as a set).
2. Insert the left and right original side bearing adjusting washers in
place between side bearings and gear carrier.
3. Align the matching mark on the side bearing cap with the match-
ing mark on the gear carrier.
4. Install the side bearing caps and tighten the side bearing cap
bolts to the specified torque.
5. Turn the differential assembly several times to seat the side
bearings.
6. To determine side bearing preload torque, measure the pulling
force of the differential assembly at the drive gear bolt using
Tool.
NOTE:
If pulling force of the differential assembly at the drive gear bolt
is within specification, side bearing preload torque will also be
within specification. Refer to RFD-32, "
Inspection and Adjustment".
SPD527
SPD924
SDIA1795E
Tool number : — (J-8129)
Specification : 34.2 - 39.2 N (3.5 - 4.0 kg, 7.7 - 8.8 lb)
of pulling force at the drive gear bolt
SPD194A