2011 INFINITI QX56 Factory Service Manual

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Page 1969 of 5598

INFINITI QX56 2011 Factory Service Manual
DIFFERENTIAL ASSEMBLYDLN-167
< UNIT DISASSEMBLY AND ASSEMBLY > [FRONT FINAL DRIVE: R180A]
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DIFFERENTIAL ASSEMBLY
Exploded ViewINFOID:0000000006222391
1. Bushing 2. Bea

Page 1970 of 5598

INFINITI QX56 2011 Factory Service Manual
DLN-168
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DIFFERENTIAL ASSEMBLY
Disassembly
INFOID:0000000006222392
1. Remove bushing with drift (commercial service tool).
2. Remove differe

Page 1971 of 5598

INFINITI QX56 2011 Factory Service Manual
DIFFERENTIAL ASSEMBLYDLN-169
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8. Remove housing spacer.
9. Remove side bearing inner race with the puller

DIFFERENTIAL ASSEMBLYDLN-169
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8. Remove housing spacer.
9. Remove side bearing inner race with the puller (A) and base (B).
CAUTION:
To prevent damage to the side bearing and drive gear,place copper plates between these parts and vise.
It is necessary to remove si de bearing inner race except
when it is replaced.
10. For proper reinstallation, paint matching marks on the differential case and drive gear.
CAUTION:
For matching marks, use paint. Never damage differential
case and drive gear.
11. Remove the drive mounting gear bolts.
12. Tap the drive gear off the differential case using suitable tool. CAUTION:
Tap evenly all around to keep drive gear from bending.
13. Perform inspection after disassembly. Refer to DLN-174,
"Inspection".
AssemblyINFOID:0000000006222393
1. Apply thread locking sealant into the threaded holes of the drive
gear and install the new drive gear bolts.
Use Genuine High Strength Thread Locking Sealant or equiv-
alent. Refer to GI-22, "
Recommended Chemical Products and
Sealants".
CAUTION:
Clean degrees drive gear back and threaded holes suffi-
ciently.
2. Install the drive gear to differential case assembly. CAUTION:
Align the matching marks of differential case assembly and
drive gear
3. Tighten the drive gear mounting bolts with the following procedure. CAUTION:
Apply anti-corrosion oi l to the thread and seat of mounting bolts.
a. Tighten the bolts in a crisscross fashion to the specified torque.
b. Tighten the bolts additionally at the specified angle.
CAUTION:
Check the tightening angle us ing the angle wrench (A)
[SST: KV10112100 (BT-8653-A)]. Never make judgment by
visual inspection.
A: Puller [SST: ST33051001 (J-22888-20)]
B: Base [SST: ST33061000 (J-8107-2)]
PDIA0827E
PDIA0496E
SDIA2594E
Drive gear mounting
bolts tightening torque : 58.8 Nm (6.0 kg-m, 43 ft-lb)
Drive gear mounting
bolts tightening angle : 34 to 39 degree
AWBIA0722ZZ
Revision: 2010 May2011 QX56

Page 1972 of 5598

INFINITI QX56 2011 Factory Service Manual
DLN-170
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DIFFERENTIAL ASSEMBLY
4. Press side bearing inner races to the differential case with the
drift (A) and the base (B).
CAUTION:
Neve

Page 1973 of 5598

INFINITI QX56 2011 Factory Service Manual
DIFFERENTIAL ASSEMBLYDLN-171
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10. Check and adjust drive gear runout, tooth contac t, backlash, and total

DIFFERENTIAL ASSEMBLYDLN-171
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10. Check and adjust drive gear runout, tooth contac t, backlash, and total preload torque. Refer to DLN-171,
"Adjustment".
Recheck above items. Readjust the above description, if necessary.
11. Apply sealant to match surface of carrier cover. Use Genuine Silicone RTV or equivalent. Refer to GI-22,
"Recommended Chemical Products and Sealants".
CAUTION:
Remove any old sealant adheri ng to the mating surfaces.
Also remove any moisture, oil, or foreign material adhering
to the application and mating surfaces.
12. Install the carrier cover to the gear carrier. Tighten the bolts to the specified torque.
13. Install side shaft. Refer to DLN-166, "
Assembly".
14. Install bushing with drift (commercial service tool).
AdjustmentINFOID:0000000006222394
TOTAL PRELOAD TORQUE
1. Install the differential side shaft. Refer to DLN-166, "Assembly".
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 with the preload gauge [SST: ST3127S000 (J-25765-A)].
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. Remove carrier cover. Refer to DLN-168, "Disassembly".
PDIA0712E
Total preload torque : Refer to DLN-185, "Pre-
load Torque".
PDIA0697E
When the preload torque is large
On drive pinion bear ings: Decrease the drive pinion bear ing adjusting washer and drive
pinion adjusting washer thi ckness. For selecting adjusting
washer, refer to the latest parts information.
On side bearings: Increase the side bear ing adjusting washer thickness. For se-
lecting adjusting washer, refer to the latest parts information.
When the preload torque is small On drive pinion bearings: Increase the drive pi nion bearing adjusting washer and drive
pinion adjusting washer thi ckness. For selecting adjusting
washer, refer to the latest parts information.
On side bearings: Decrease the side bear ing adjusting washer thickness. For se-
lecting adjusting washer, refer to the latest parts information.
Revision: 2010 May2011 QX56

Page 1974 of 5598

INFINITI QX56 2011 Factory Service Manual
DLN-172
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DIFFERENTIAL ASSEMBLY
2. Fit a dial indicator to the drive gear back face.
3. Rotate the drive gear to measure runout.
If the run

Page 1975 of 5598

INFINITI QX56 2011 Factory Service Manual
DIFFERENTIAL ASSEMBLYDLN-173
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4. If the tooth contact is improperly adjusted, adjust the drive pinion
hei

Page 1976 of 5598

INFINITI QX56 2011 Factory Service Manual
DLN-174
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DIFFERENTIAL ASSEMBLY
If the tooth contact is near the flank (flank contact), or near the
toe (toe contact), use a thinner drive

DLN-174
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DIFFERENTIAL ASSEMBLY
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.
For selecting adjusting washer, refer to the latest parts infor-
mation.
BACKLASH
1. Remove carrier cover. Refer to DLN-168, "Disassembly".
2. Fit a dial indicator to the drive gear face to measure the back- lash.
If the backlash is outside of the specification, change the thick-
ness of the side bearing adjusting washers.
CAUTION:
Never change the total amount of wash ers as it changes the preload torque.
InspectionINFOID:0000000006222395
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 ch ipped (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
PDIA0441E
Backlash : Refer to DLN-185, "Back-
lash".
When the backlash is large: Make drive gear back side adjusting washer thicker,
and drive tooth side adjust ing washer thinner by the
same amount. For selecting adjusting washer, refer to
the latest parts information.
If the backlash is less than specification: Make drive gear back side ad justing washer thinner,
and drive tooth side adjust ing washer thicker by the
same amount. For selecting adjusting washer, refer to
the latest parts information.
SPD513
Revision: 2010 May2011 QX56

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