2011 INFINITI QX56 differential

STRUCTURE AND OPERATIONDLN-191
< SYSTEM DESCRIPTION > [REAR FINAL DRIVE: R230]
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SYSTEM DESCRIPTION
STRUCTURE AND OPERATION
Sectional ViewINFOID:0000000006222409
CROSS-SECTIONAL VIEW
1. Side flange 2. Pinion mate gear 3. Drive gear
4. Pinion mate shaft 5. Differential case 6. Side bearing
7. Drive pinion 8. Pinion front bearing 9. Companion flange
10. Collapsible spacer 11. Pinion rear bearing 12. Side gear
PDIA0923E
Revision: 2010 May2011 QX56

REAR DIFFERENTIAL GEAR OILDLN-193
< PERIODIC MAINTENANCE > [REAR FINAL DRIVE: R230]
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PERIODIC MAINTENANCE
REAR DIFFERENTIAL GEAR OIL
InspectionINFOID:0000000006222411
OIL LEAKAGE
Check that differential gear oil is not leaking fr om the rear final drive assembly or around it.
OIL LEVEL
 Remove filler plug (1) and check oil level from filler plug mounting
hole as shown in the figure.
CAUTION:
Never start engine while checking oil level.
 Set a gasket on filler plug (1) and install it on final drive assembly. Refer to DLN-203, "
Exploded View".
CAUTION:
Never reuse gasket.
DrainingINFOID:0000000006222412
1. Stop the engine.
2. Remove drain plug (1) and drain gear oil.
3. Set a gasket on drain plug (1) and install it to final drive assem- bly and tighten to the specified torque. Refer to DLN-203,
"Exploded View".
CAUTION:
Never reuse gasket.
RefillingINFOID:0000000006222413
1. Remove filler plug (1). Fill with new gear oil until oil level reaches the specified level near filler plug mounting hole.
2. After refilling oil, check oil level. Set a gasket to filler plug (1), then install it to final drive assembly. Refer to DLN-203,
"Exploded View".
CAUTION:
Never reuse gasket.
JPDID0415ZZ
JPDID0392ZZ
Oil grade and viscosity : Refer to MA-10, "Fluids and
Lubricants".
Oil capacity : Refer to DLN-222, "
General
Specification".
JPDID0415ZZ
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-203
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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UNIT DISASSEMBLY AND ASSEMBLY
DIFFERENTIAL ASSEMBLY
Exploded ViewINFOID:0000000006222420
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. Co mply with the assembly proce-
dure when tightening. Refer to DLN-
206, "Assembly".
: Apply gear oil. : Apply anti-corrosion oil.
JPDID0397GB
Revision: 2010 May2011 QX56

DLN-204
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DIFFERENTIAL ASSEMBLY
Disassembly
INFOID:0000000006222421
1. Drain gear oil, if necessary.
2. Remove side flanges.
3. Remove rear cover mounting bolts.
4 . R e m o v e r e a r c o v e r t o i n s e r t t h e s e a l c u t t e r [ S S T: K V 1 0 1111 0 0 (J-37228)] between gear carrier and rear cover.
CAUTION:
 Never damage the mating surface.
 Never insert flat-bladed screwdriver, this may damage themating surface.
5. Using spacers, mount carrier on the attachment (A) [SST:
KV38100800 (J-25604-01)].
6. For proper reinstallation, paint matching marks on one side of the bearing cap.
CAUTION:
 For matching marks, use paint. Never damage bearingcaps and gear carrier.
 Bearing caps are manufactured as integral molding. Use the matching marks to them in their original positions.
7. Remove bearing caps.
: Apply Genuine Silicone RTV or equivalent. Refer to GI-22, "Recommended Chemical Products and Sealants".
: Apply Genuine High Strength Thread Locking Sealant or equivalent. Refer to GI-22, "
Recommended Chemical Products
and Sealants".
Refer to GI-4, "
Components" for symbols not described above.
PDIA0940E
JSDIA0041ZZ
SDIA1795E
S-PD343
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-205
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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8. Lift differential case assembly out with a suitable tool.
 Keep side bearing outer races together with inner race. Nevermix them up.
Also, keep side bearing adjusting washers together with bear-
ings.
9. Remove side bearing inner race. To prevent damage to bearing, engage puller jaws in groove
().
CAUTION:
 To prevent damage to the side bearing and drive gear,place copper plates between these parts and vise.
 It is not necessary to remove side bearing inner race
except when it is replaced.
10. For proper reinstallation, paint matching marks on one differen- tial case assembly.
CAUTION:
For matching marks, use paint. Never damage differential
case and drive gear.
11. Remove drive gear mounting bolts.
12. Tap drive gear off differential case assembly with a soft hammer. CAUTION:
Tap evenly all around to keep drive gear from bending.
PDIA0547E
SPD527
A : Puller [SST: ST33051001 (J-22888-20)]
B : Base [SST: KV40104730 ( — )]
PDIA0758J
PDIA0496E
Revision: 2010 May2011 QX56

DLN-206
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DIFFERENTIAL ASSEMBLY
13. Remove lock pin of pinion mate shaft with a punch from drive
gear side.
14. Remove pinion mate shaft.
15. Turn pinion mate gear, then remove pinion mate gear, pinion mate thrust washer, side gear and side gear thrust washer from
differential case.
16. Perform inspection after disassembly. Refer to DLN-215,
"Inspection".
AssemblyINFOID:0000000006222422
1. Install side gear thrust washers with the same thickness as the
ones installed prior to disassembly or reinstall the old ones on
the side gears.
PDIA0759J
SDIA0031J
SDIA0032J
SDIA0193J
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-207
< UNIT DISASSEMBLY AND ASSEMBLY > [REAR FINAL DRIVE: R230]
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2. Install side gears and thrust washers into differential case. CAUTION:
Make sure that the circular clip is installed to side gears.
3. Align 2 pinion mate gears in diagonally opposite positions, then rotate and install them into differential case after installing thrust
washer to pinion mate gear.
4. Align the lock pin holes on differential case with shaft, and install pinion mate shaft.
5. Measure side gear end play. If necessary, sele ct the appropriate side gear thrust washers.
a. Place differential case straight up so that side gear to be mea- sured comes upward.
SDIA2025E
SDIA0195J
JPDID0205GB
Revision: 2010 May2011 QX56

DLN-208
< UNIT DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
DIFFERENTIAL ASSEMBLY
b. Using feeler gauge, measure the clearance between side gear
back and differential case at 3 different points, while rotating
side gear. Average the 3 readings, and then measure the clear-
ance of the other side as well.
CAUTION:
To prevent side gear from tilt ing, insert feeler gauges with
the same thickness from both sides.
c. If the back clearance is outside the specification, use a thicker/ thinner side gear thrust washer to adjust. For selecting thrust
washer, refer to the latest parts information.
CAUTION:
Select a side gear thrust wash er for right and left individu-
ally.
6. Drive a lock pin into pinion mate shaft, using a punch. Make sure lock pin is flush with differential case.
CAUTION:
Never reuse lock pin.
7. Apply thread locking sealant into the thread hole of drive gear.  Use Genuine High Strength Thread Locking Sealant or equiv-alent. Refer to GI-22, "
Recommended Chemical Products and
Sealants".
CAUTION:
Clean and degrease drive gear back and threaded holes
sufficiently.
8. Install drive gear to differential case. CAUTION:
Align the matching marks of differential case and drive
gear.
9. Tighten the mounting bolts with the following procedure. CAUTION:
Apply anti-corrosin oil to th e thread and seat of mounting
bolts.
a. Tighten the bolts in a crisscross fashion to the specified torque.
b. Tighten the bolts additionally to the specified angle. Standard
Side gear back clearance : Refer to
DLN-222, "
Side
Gear Clearance".
When the back clearance
is large: Use a thicker thrust wash-
er.
When the back clearance
is small: Use a thinner thrust wash-
er.
PDIA0576E
SPD030
SDIA2594E
Drive gear mounting
bolts tightening torque: 78.5 Nm (8.0 kg-m, 58 ft-lb)
SDIA0247J
Revision: 2010 May2011 QX56