differential INFINITI QX56 2011 Factory Workshop Manual

DLN-166
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
SIDE SHAFT
8. Press differential side shaft out of differential side shaft bearing.
CAUTION:
Never drop differential side shaft.
9. Perform inspection after disassembly. Refer to DLN-166,
"Inspection".
AssemblyINFOID:0000000006222389
1. Press differential side shaft bearing to differential side shaft.
CAUTION:
Never reuse differential side shaft bearing.
2. Install snap ring (differential side shaft side).
3. Install differential side shaft assembly into gear carrier.
4. Install snap ring (hole side).
5. Install side oil seal (right side) until it becomes flush with the gear carrier, with the drifts (A and B).
CAUTION:
 Never reuse side 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.
InspectionINFOID:0000000006222390
INSPECTION AFTER DISASSEMBLY
Side Shaft
 If it is chipped (by friction), cracked, damaged, or unusually worn, replace.
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).
Oil Seal
 Whenever disassembled, replace.
 If wear, deterioration of adherence (sealing force lips) , or damage is detected on the lips, replace them.
PDIA0718E
PDIA0719E
A: Drift [SST: ST30720000 (J-25405)]
B: Drift [SST: ST27863000 ( — )]
PDIA0828E
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-167
< UNIT DISASSEMBLY AND ASSEMBLY > [FRONT FINAL DRIVE: R180A]
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DIFFERENTIAL ASSEMBLY
Exploded ViewINFOID:0000000006222391
1. Bushing 2. Bearing cap 3. Side bearing
4. Side bearing adjusting washer 5. Drive pinion 6. Pinion height adjusting washer
7. Pinion rear bearing 8. Collapsible spacer 9. Gasket
10. Drain plug 11. Side oil seal (left side) 12. Pinion front bearing
13. Front oil seal 14. Companion flange 15. Drive pinion lock nut
16. Gear carrier 17. Side shaft 18. Side shaft bearing
19. Snap ring 20. Snap ring 21. Side oil seal (right side)
22. Drive gear 23. Differential case assembly 24. Housing spacer
25. Filler plug 26. Carrier cover
A: Oil seal lip B: Screw hole C. Comply with the assembly proce- dure when tightening. Refer to DLN-
169, "Assembly".
: Apply gear oil. : Apply anti-corrosion oil.
: Apply multi-purpose grease.
JPDID0390GB
Revision: 2010 May2011 QX56

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 differential side shaft assembly. Refer to DLN-165, "
Disassembly".
3. Remove side oil seal (left side) from gear carrier with a suitable tool.
4. For proper reinstallation, paint matching marks on one side of the side bearing cap and gear carrier.
CAUTION:
 For matching marks, use paint. Never damage side bear-ing cap and gear carrier.
 Bearing caps are manufactured as integral molding. Use the matching marks to them in their original positions.
5. Remove the side bearing caps.
6. Lift the differential case assembly out of the gear carrier with sliding hammer (commercial service tool).
7. Remove the differential case assembly with the side bearing outer race and side bearing adjusting washer.
CAUTION:
 Keep side bearing outer races together with side bearing
inner races. Do not mix them up.
 Keep side bearing adjusting washers together with side
bearings.
: 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.
SDIA1795E
PDIA0701E
PDIA0547E
SPD919
Revision: 2010 May2011 QX56

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

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:
Never reuse side bearing inner races.
5. Install housing spacer.
6. Install the differential case assembly with the side bearing outer races into the gear carrier.
CAUTION:
 Never reuse side bearing outer race when replacing sidebearing inner race (replace as a set).
 Apply differential gear oi l to the side bearings.
7. Insert left and right original side bearing adjusting washers in place between side bearings and gear carrier.
8. Install the side bearing caps with the matching marks aligned and tighten the side bearing cap bolts to the specified torque.
CAUTION:
Align matching marks on bearin g cap with that on gear car-
rier.
9. Install side oil seal (left side) until it becomes flush with the gear carrier with the drift (A and B).
CAUTION:
 Never reuse side 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.
A: Drift [SST: ST33230000 (J-35867)]
B: Base [SST: ST33061000 (J-8107-2)]
SPD353
SPD919
SPD924
SDIA1795E
A: Drift [SST: ST30720000 (J-25405)]
B: Drift [SST: ST27863000 ( — )]
PDIA0711E
Revision: 2010 May2011 QX56

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

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 runout is outside of the repair limit, check drive gearassembly condition; foreign material may be caught between
the drive gear and differential case, or differential case or drive
gear may be deformed.
CAUTION:
Replace drive gear and drive pinion as a set.
TOOTH CONTACT
1. Remove carrier cover. Refer to DLN-168, "Disassembly".
2. Apply red lead to the drive gear. CAUTION:
Apply red lead to both the f aces of 3 to 4 gears at 4 loca-
tions evenly spaced on the drive gear.
3. 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.Drive gear runout : Refer to
DLN-185, "
Drive
Gear Runout".
SPD886
SPD357
SDIA0570E
Revision: 2010 May2011 QX56

DIFFERENTIAL ASSEMBLYDLN-173
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4. If the tooth contact is improperly adjusted, 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
For selecting adjusting washer, refer to the latest parts infor-
mation.
SDIA2549E
SDIA0517E
PDIA0440E
Revision: 2010 May2011 QX56

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

DIFFERENTIAL ASSEMBLYDLN-175
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 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.
Revision: 2010 May2011 QX56