2011 INFINITI QX56 service

FRONT OIL SEALDLN-159
< REMOVAL AND INSTALLATION > [FRONT FINAL DRIVE: R180A]
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3. Apply anti-corrosion oil to the thread and seat of new drive pin- ion lock nut, and temporarily tighten drive pinion lock nut to drive
pinion, using flange wrench (commercial service tool).
CAUTION:
Never reuse drive pinion lock nut.
4. Tighten drive pinion lock nut within the limits of specified torque so as to keep the pinion bearing preload within a standard val-
ues, using preload gauge (A) [SST: ST3127S000 (J-25765-A)].
CAUTION:
 Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.
 If the preload torque exceeds the specified value, replace collapsible spacer and tighte n it again to adjust. Never
loosen drive pinion lock nut to adjust the preload torque.
5. Fit a dial indicator onto the companion flange face (inner side of the propeller shaft mounting bolt holes).
6. Rotate the companion flange to check for runout.
7. Fit a test indicator to the inner side of the companion flange (socket diameter).
8. Rotate the companion flange to check for runout.
9. If the runout value is outside the repair limit, follow the procedure below to adjust.
a. Check for runout while changing the phase between companion flange and drive pinion gear by 90 ° step,
and search for the position where the runout is the minimum.
b. If the runout value is still outside of the limit after the phase has been changed, possible causes are be an
assembly malfunction of drive pinion and pinion bear ing and malfunction of pinion bearing. Check for
these items and repair if necessary.
c. If the runout value is still outsi de of the limit after the check and repair, replace companion flange.
10. Install front propeller shaft. Refer to DLN-129, "
Removal and Installation".
11. Install drive shaft. Refer to FAX-22, "
Removal and Installation".
12. Refill gear oil to the final drive and check oil level. Refer to DLN-155, "
Refilling".
13. Check the final drive for oil leakage. Refer to DLN-155, "
Inspection".
Total preload torque: A value
that add 0.1 – 0.4 N·m
(0.01 – 0.04 kg-m, 1 – 3 in-lb) to
the measured value when re-
moving.
PDIA1003E
Companion flange runout : Refer to DLN-185, "Com-
panion Flange Runout".
Companion flange runout : Refer to DLN-185, "
Com-
panion Flange Runout".
JSDIA0116ZZ
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-171
< UNIT DISASSEMBLY AND ASSEMBLY > [FRONT FINAL DRIVE: R180A]
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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

DRIVE PINIONDLN-177
< UNIT DISASSEMBLY AND ASSEMBLY > [FRONT FINAL DRIVE: R180A]
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DisassemblyINFOID:0000000006222397
1. Remove the side shaft. Refer to DLN-165, "Disassembly".
2. Remove the differential assembly. Refer to DLN-168, "
Disassembly".
3. Remove the drive pinion lock nut with a flange wrench (commer- cial service tool).
4. Put matching mark (B) on the end of drive pinion. The matching mark should be in line with the matching mark (A) on companion
flange (1).
CAUTION:
For matching, marks use paint. Never damage companion
flange and drive pinion.
5. Remove the companion flange with the puller (commercial ser- vice tool).
6. Press the drive pinion assembly. CAUTION:
Never drop drive pinion assembly.
: 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.
PDIA0702E
PDIA0799J
PDIA0703E
PDIA0704E
Revision: 2010 May2011 QX56

DLN-178
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DRIVE PINION
7. Remove the front oil seal with a suitable tool.
CAUTION:
Never damage gear carrier.
8. Remove the drive pinion front bearing inner race.
9. Remove the collapsible spacer.
10. Remove the drive pinion rear bearing inner race and drive pinion height adjusting washer with the replacer (commercial service
tool).
11. Remove the drive pinion front and rear bearing outer races by tapping them uniformly with a suitable tool.
CAUTION:
Never damage gear carrier.
12. Perform inspection after disassembly. Refer to DLN-184,
"Inspection".
PDIA0716E
S-PD179
PDIA0705E
Revision: 2010 May2011 QX56

DLN-180
< UNIT DISASSEMBLY AND ASSEMBLY >[FRONT FINAL DRIVE: R180A]
DRIVE PINION
7. Using drift [SST: ST33200000 (J-26082)], press the pinion front
bearing inner race to drive pinion as far as drive pinion nut can
be tightened.
8. Install front oil seal as shown in figure with the drifts (A and B). 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.
9. Install companion flange (1). NOTE:
When reusing drive pinion, align the matching mark (B) of drive
pinion with the matching mark (A) of companion flange, and then
install companion flange (1).
10. Temporarily tighten drive pinion lock nut to drive pinion. CAUTION:
 Apply anti-corrosion oil to th e thread and seat of the drive
pinion lock nut
 Never reuse drive pinion lock nut.
11. Tighten to drive pinion lock nut using flange wrench (A), while adjusting pinion bearing preload torque using preload gauge (B).
CAUTION:
 Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.
 After adjustment, rotate dri ve pinion back and forth 2 to 3
times to check for unusual no ise, rotation malfunction,
and other malfunctions.
12. Install differential case assembly. Refer to DLN-169, "
Assem-
bly".
CAUTION:
PDIA0709E
A: Drift [SST: ST30720000 (J-25405)]
B: Drift [SST: ST27863000 ( — )]
PDIA0717E
PDIA0799J
A: Flange wrench (commercial service tool)
B: Preload gauge [SST: ST3127S000 (J-25765-A)]
Pinion bearing preload : Refer to DLN-185, "Pre-
load Torque".
WDIA0382E
Revision: 2010 May2011 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)
DLN-185
< SERVICE DATA AND SPECIFICATIONS (SDS) [FRONT FINAL DRIVE: R180A]
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationsINFOID:0000000006222401
Drive Gear RunoutINFOID:0000000006222402
Unit: mm (in)
Preload TorqueINFOID:0000000006222403
Unit: N·m (kg-m, in-lb)
BacklashINFOID:0000000006222404
Unit: mm (in)
Companion Flange RunoutINFOID:0000000006222405
Unit: mm (in)
Applied model 4WD
VK56VD A/T
Final drive model R180A
Gear ratio 2.937
Number of teeth (Drive gear/Drive pinion) 47/16
Oil capacity (Approx.) (US pt, lmp pt)0.75 (1-5/8, 1-3/8)
Number of pinion gears 4
Drive pinion adjustment spacer type Collapsible
Item Limit
Drive gear back face runout 0.05 (0.0020)
Item Standard
Pinion bearing (P
1) 1.08 – 1.66 (0.11 – 0.16, 10 – 14)
Side bearing (P
2) 0.59 – 1.08 (0.06 – 0.11, 6 – 9)
Side bearing to pinion bearing (Total preload)
(Total preload = P
1 + P2) 1.67 – 2.74 (0.17 – 0.27, 15 – 24)
Item Standard
Drive gear to drive pinion gear 0.10 – 0.15 (0.0039 – 0.0059)
Item Limit
Companion flange face 0.10 (0.004)
Inner side of the companion flange 0.10 (0.004)
Revision: 2010 May2011 QX56

DLN-186
< PRECAUTION >[REAR FINAL DRIVE: R230]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Service Notice or Precautions for Rear Final DriveINFOID:0000000006222406
 Check for the correct installation status prior to removal or disassembly. If matching marks are required, be
certain they never interfere with the function of the parts when applied.
 Overhaul should be done in a clean work area, it is preferable to work in dustproof area.
 Before disassembly, using steam or white gasoline, completely remove sand and mud from the exterior of
the unit, preventing them from entering into the unit during disassembly or assembly.
 Check appearance of the disassembled parts for dam age, deformation, and unusual wear. Replace them
with new ones, if necessary.
 Gaskets, seals and O-rings should be replaced any time when the unit is disassembled.
 In principle, tighten bolts or nuts gradually in several steps working diagonally from inside to outside. If tight-
ening sequence is specified, observe it.
 Clean and flush the parts sufficiently and blow-dry them.
 Be careful not to damage sliding surfaces and mating surfaces.
 When applying sealant, remove the old sealant from t he mounting surface; then remove any moisture, oil,
and foreign materials from the application and mounting surfaces.
 Always use shop paper for cleaning the inside of components.
 Never use cotton gloves or shop rags to prevent entering of lint.
 During assembly, observe the specified tightening tor que, and apply new gear oil, petroleum jelly, or multi-
purpose grease as specified for each vehicle, if necessary.
Revision: 2010 May2011 QX56