2011 INFINITI QX56 differential

DIFFERENTIAL ASSEMBLYDLN-209
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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CAUTION:
Check the tightening angl e using the angle wrench [SST: KV10112100 (BT-8653-A)]. Never make
judgment by visual inspection.
10. Press side bearing inner races to differential case, using the drift (A) and the base (B).
CAUTION:
Never reuse side bearing inner race.
11. Install differential case assembly with side bearing outer races into gear carrier.
12. Measure side bearing preload. If necessary, select the appropri- ate side bearing adjusting washers. Refer to DLN-210, "
Adjust-
ment".
13. Insert selected left and right side bearing adjusting washers in place between side bearings and gear carrier. Refer to DLN-
210, "Adjustment".
14. Align matching marks on bearing cap with that on gear carrier.
15. Install bearing caps and tighten bearing cap mounting bolts. Drive gear mounting
bolts tightening angle
: 31 to 36 degree
A : Drift [SST: ST01550002 ( — )]
B : Drift [SST: KV40104730 ( — )]
SPD353
SPD527
SPD558
SDIA1795E
Revision: 2010 May2011 QX56

DLN-210
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DIFFERENTIAL ASSEMBLY
16. Using the drift [SST: ST35271000 (J-26091)], drive side oil seals
until it becomes flush with the case end.
CAUTION:
 Never reuse oil seal.
 When installing, n ever incline oil seal.
 Apply multi-purpose grease onto oil seal lips, and gear oil
onto the circumference of oil seal.
17. Check and adjust drive gear runout, tooth contact, drive gear to drive pinion backlash, and total preload torque. Refer to DLN-
210, "Adjustment".
Recheck above items. Readjust the above description, if neces-
sary.
18. Apply sealant to mating surface of rear cover.  Use Genuine Silicone RTV or equivalent. Refer to GI-22,
"Recommended Chemical Products and Sealants".
CAUTION:
Remove old sealant adhering to mounting surfaces. Also
remove any moisture, oil, or foreign material adhering to
application and mounting surfaces.
19. Install rear cover on gear carrier and tighten mounting bolts.
20. Install side flange with the following procedure.
a. Attach the protector [SST: KV38108000 ( — )] to side oil seal.
b. After the side flange is inserted and the serrated part of side gear has engaged the serrated part of flange, remove the pro-
tector.
c. Insert the side flange until the se rrated part of the side flange
has engaged the serrated part of the side gear and remove the
protector.
NOTE:
When installation is completed, driving sound of the side flange
turns into a sound that seems to affect the whole final drive.
d. Confirm that the dimension of the side flanges (1) installation measurement (A) in the figure comes into the following.
AdjustmentINFOID:0000000006222423
TOTAL PRELOAD TORQUE
Before inspection and adjustment, drain gear oil.
1. Secure final drive assembly onto an attachment [SST: KV38100800 ( — )].
2. Remove side flanges.
3. Rotate drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.
SPD560
PDIA0961E
SDIA0822E
A : 342.2 mm (13.47 in)
JSDIA0185ZZ
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-211
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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4. Rotate drive pinion at least 20 times to check for smooth opera- tion of the bearing.
5. Measure total preload with the preload gauge (A) [SST: ST3127S000 (J-25765-A)].
NOTE:
Total preload torque = Pinion bearing preload torque + Side
bearing preload torque
 If measured value is out of the specification, disassemble it to
check and adjust each part. Adjust the pinion bearing preload and side bearing preload.
Adjust the pinion bearing preload firs t, then adjust the side bearing preload.
SIDE BEARING PRELOAD
Before inspection and adjustment, drain gear oil.
1. Remove rear cover. Refer to DLN-204, "
Disassembly".
2. Make sure all parts are clean. Also, make sure the bearings are well lubricated with gear oil.
3. Place the differential case, with side bearings and bearing races installed, into gear carrier.
4. Insert left and right original side bearing adjusting washers in place between side bearings and gear carrier.Total preload torque : Refer to
DLN-222, "
Pre-
load Torque".
JSDIA0042ZZ
When the preload torque is large
On pinion bearings: Replace the collapsible spacer.
On side bearings: Use thinner side bearing adjusting washers by the same amount to
each side. For selecting adjusting wash er, refer to the latest parts in-
formation.
When the preload is small On pinion bearings: Tighten the drive pinion lock nut.
On side bearings: Use thicker side bearing adjusting washers by the same amount to
each side. For selecting adjusting wash er, refer to the latest parts in-
formation.
SPD527
SPD558
Revision: 2010 May2011 QX56

DLN-212
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DIFFERENTIAL ASSEMBLY
5. Install bearing caps in their correct locations and tighten bearing
cap mounting bolts.
6. Turn the carrier several times to seat the bearings.
7. Measure the turning torque of the carrier at the drive gear mounting bolts with a spring gauge [SST: — (J-8129)].
8. If the turning torque is outside the specification, use a thicker/ thinner side bearing adjusting washer to adjust. For selecting
adjusting washer, refer to the latest parts information.
CAUTION:
Select a side bearing adjust ing washer for right and left
individually.
9. Record the total amount of washer thickness required for the correct carrier side bearing preload.
DRIVE GEAR RUNOUT
1. Remove rear cover. Refer to DLN-204, "Disassembly".
2. Fit a dial indicator to the drive gear back face.
3. Rotate the drive gear to measure runout.
 If the runout is outside of the repair limit, check drive gearassembly condition; foreign material may be caught between
drive gear and differential case, or differential case or drive
gear may be deformed, etc.
CAUTION:
Replace drive gear and dri ve pinion gear as a set.
TOOTH CONTACT
Before inspection and adjustment, drain gear oil.
1. Remove rear cover. Refer to DLN-204, "
Disassembly".
SDIA1795E
Specification : 34.2 – 39.2N (3.5 – 4.0 kg,
7.7 – 8.8 lb) of pulling force
at the drive gear bolt
SPD194A
If the turning torque is less
than the specified range:Use a thicker thrust wash-
er.
If the turning torque is
greater than the specifica-
tion: Use a thinner thrust wash-
er.
SPD772
Drive gear runout : Refer to
DLN-222, "Drive
Gear Runout".
SPD886
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-213
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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2. Apply red lead to drive gear. CAUTION:
Apply red lead to both the f aces of 3 to 4 gears at 4 loca-
tions evenly spaced on drive gear.
3. Rotate drive gear back and forth several times, check drive pin- ion gear to drive gear tooth contact.
CAUTION:
Check tooth contact on dri ve side and reverse side.
SPD357
SDIA0570E
JPDID0398GB
Revision: 2010 May2011 QX56

DLN-214
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DIFFERENTIAL ASSEMBLY
4. If tooth contact is improperly adjusted, follow the procedure
below to adjust the pinion height [dimension (X)].
 If the tooth contact is near the face (face contact), or near theheel (heel contact), thicken pinion height adjusting washers to
move drive pinion closer to drive gear.
For selecting adjusting washer, refer to the latest parts infor-
mation.
 If the tooth contact is near the flank (flank contact), or near the toe (toe contact), thin pinion height adjusting washers to move
drive pinion farther from drive gear.
For selecting adjusting washer, refer to the latest parts infor-
mation.
BACKLASH
Before inspection and adjustment, drain gear oil.
1. Remove rear cover. Refer to DLN-204, "
Disassembly".
2. Fit a dial indicator to the drive gear face to measure the back- lash.
 If the backlash is outside of the specified value, change thethickness of side bearing adjusting washer.
SDIA0517E
PDIA0440E
PDIA0441E
Backlash : Refer to DLN-222, "Back-
lash".
When the backlash is large: Make drive gear back side adjusting washer thicker,
and drive gear tooth side adjusting washer thinner by
the same amount. For selectin g adjusting washer, re-
fer to the latest parts information.
SPD513
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-215
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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CAUTION:
Never change the total amount of wash ers as it changes the bearing preload.
InspectionINFOID:0000000006222424
INSPECTION AFTER DISASSEMBLY
Drive Gear and Drive Pinion
 Clean up the disassembled parts.
 If the gear teeth never mesh or line-up correctly, det ermine the cause and adjust or replace as necessary.
 If the gears are worn, cracked, damaged, pitted or chi pped (by friction) noticeably, replace with new drive
gear and drive pinion as a set.
Bearing
 Clean up the disassembled parts.
 If any chipped (by friction), pitted, worn, rusted or scratched marks, or unusual noise from the bearing is
observed, replace as a bearing assembly (as a new set).
Side Gear and Pinion Mate Gear
 Clean up the disassembled parts.
 If any cracks or damage on the surfac e of the tooth is found, replace.
 If any worn or chipped mark on the contact si des of the thrust washer is found, replace.
Side Gear Thrust Washer and Pinion Mate Thrust Washer
 Clean up the disassembled parts.
 If it is chipped (by friction), damaged, or unusually worn, replace.
Oil Seal
 Whenever disassembled, replace.
 If wear, deterioration of adherence (sealing force lips ), or damage is detected on the lips, replace them.
Differential case
 Clean up the disassembled parts.
 If any wear or crack on the contact sides of the differential case is found, replace.
When the backlash is small:
Make drive gear back side adjusting washer thinner,
and drive gear tooth side ad justing washer thicker by
the same amount. For selecting adjusting washer, re-
fer to the latest parts information.
Revision: 2010 May2011 QX56

DLN-216
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DRIVE PINION
DRIVE PINION
Exploded ViewINFOID:0000000006222425
1. Rear cover 2. Bearing cap 3. Side gear thrust washer
4. Side gear 5. Pinion mate thrust washer 6. Pinion mate gear
7. Pinion mate shaft 8. Lock pin 9. Side bearing
10. Side bearing adjusting washer 11. Drive pinion 12. Pinion height adjusting washer
13. Pinion rear bearing 14. Collapsible spacer 15. Side flange
16. Circlip 17. Side oil seal 18. Gear carrier
19. Pinion front bearing 20. Front oil seal 21. Companion flange
22. Drive pinion lock nut 23. Drive gear 24. Differential case
25. Gasket 26. Drain plug 27. Filler plug
A. Oil seal lip B. Screw hole C. Comply with the assembly proce-
dure when tightening. Refer to DLN-
206, "Assembly".
: Apply gear oil. : Apply anti-corrosion oil.
: Apply Genuine Silicone RTV or equivalent. Refer to GI-22, "
Recommended Chemical Products and Sealants".
JPDID0397GB
Revision: 2010 May2011 QX56