2006 INFINITI QX56 differential

QUICK REFERENCE CHART: QX562006

QUICK REFERENCE CHART: QX56PFP:00000
Engine Tune-Up DataELS001QQ
Cylinder arrangementV- 8
Displacement 5,552 cm
3 (338.80 in3 )
Bore and stroke 98 x 92 mm (3.86 x 3.62 in)
Valve arrangement DOHC
Firing order 1-8-7-3-6-5-4-2
Number of piston rings Compression
2
Oil 1
Number of main bearings 5
Compression ratio 9.8:1
Compression pressure Standard
1,520 kPa (15.5 kg/cm
2 , 220 psi) / 200 rpm
Minimum 1,324 kPa (13.5 kg/cm
2 , 192 psi) / 200 rpm
Differential limit between cylinders 98 kPa (1.0 kg/cm
2 , 14 psi) / 200 rpm
Cylinder number
Valve timing Unit: degree
abcde f
232° 230° 2° 48° 3° 49°
SEM957C
PBIC0187E

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGBR-5
C
DE
G H
I
J
K L
M A
B
BR
Revision: November 2009 2006 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEFS004VZ
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
BR-21
,
BR-27
BR-21
, BR-27
BR-21
, BR-27
BR-25
, BR-30
BR-25
, BR-30
BR-25
, BR-30
BR-25
, BR-30
BR-25
, BR-30
BR-25
, BR-31
BR-25
, BR-31

PR-3, "
NVH Troubleshooting Chart
"
FFD-6, "
NVH Troubleshooting Chart
", RFD-7, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
", RAX-4, "
NVH Troubleshooting Chart
"
FSU-4, "
NVH Troubleshooting Chart
", RSU-5, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible cause and
SUSPECTED PARTS
Pads - damaged
Pads - uneven wear
Shims damaged
Rotor imbalance
Rotor damage
Rotor runout
Rotor deformation
Rotor deflection
Rotor rust
Rotor thickness variation
PROPELLER SHAFT
DIFFERENTIAL
DRIVESHAFT
SUSPENSION
TIRES AND ROAD WHEEL
STEERING
Symptom Noise
××× ××××××
Shake ××××××
Shimmy, Shudder ××××××× ××××

EM-104Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Standard and LimitEBS00RFL
GENERAL SPECIFICATIONS
DRIVE BELTS
EXHAUST MANIFOLD
Unit: mm (in)
Cylinder arrangement
V- 8
Displacement cm
3 (cu in) 5,552 (338.80)
Bore and stroke mm (in) 98 x 92 (3.86 x 3.62)
Valve arrangement DOHC
Firing order 1-8-7-3-6-5-4-2
Number of piston rings Compression
2
Oil 1
Number of main bearings 5
Compression ratio 9.8:1
Compression pressure
kPa (kg/cm
2 , psi)/rpm Standard 1,520 (15.5, 220)/200
Minimum 1,324 (13.5, 192)/200
Differential limit between cylinders 98 (1.0, 14)/200
Cylinder number
Va l v e t i m i n g Unit: degree
abcde f
232 ° 230° 2° 48° 3° 49°
SEM957C
PBIC0187E
Tension of drive belts Auto adjustment by auto tensioner
Items Limit
Surface distortion Exhaust manifold 0.3 (0.012)

FFD-1
FRONT FINAL DRIVE
D DRIVELINE/AXLE
CONTENTS
CE F
G H
I
J
K L
M
SECTION
A
B
FFD
Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 2
Precautions for Servicing Front Final Drive ......... ..... 2
PREPARATION ...................................................... ..... 3
Special Service Tools .......................................... ..... 3
Commercial Service Tools ................................... ..... 5
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING ........................................... ..... 6
NVH Troubleshooting Chart ................................ ..... 6
DIFFERENTIAL GEAR OIL ................................... ..... 7
Changing Differential Gear Oil ............................ ..... 7
DRAINING ........................................................ ..... 7
FILLING ............................................................ ..... 7
Checking Differential Gear Oil ............................. ..... 7
DIFFERENTIAL GEAR OIL LEAKAGE AND
LEVEL .............................................................. ..... 7
FRONT OIL SEAL ................................................. ..... 8
Removal and Installation ..................................... ..... 8
REMOVAL ........................................................ ..... 8
INSTALLATION ................................................ ..... 9
SIDE OIL SEAL ..................................................... ... 10
Removal and Installation ..................................... ... 10
REMOVAL ........................................................ ... 10
INSTALLATION ................................................ ... 10CARRIER COVER .................................................
... 11
Removal and Installation ..................................... ... 11
REMOVAL ........................................................ ... 11
INSTALLATION ................................................ ... 11
FRONT FINAL DRIVE ASSEMBLY ....................... ... 12
Removal and Installation ..................................... ... 12
REMOVAL ........................................................ ... 12
INSTALLATION ................................................ ... 13
Disassembly and Assembly ................................. ... 14
COMPONENTS ................................................ ... 14
ASSEMBLY INSPECTION AND ADJUSTMENT ... 15
DISASSEMBLY ................................................ ... 18
INSPECTION AFTER DISASSEMBLY ............. ... 23
ADJUSTING AND SELECTING WASHERS .... ... 23
ASSEMBLY ...................................................... ... 25
SERVICE DATA AND SPECIFICATIONS (SDS) ... ... 31
General Specifications ......................................... ... 31
Inspection and Adjustment .................................. ... 31
DRIVE GEAR RUNOUT ................................... ... 31
SIDE GEAR CLEARANCE ............................... ... 31
PRELOAD TORQUE ........................................... 31
BACKLASH ...................................................... ... 31
COMPANION FLANGE RUNOUT .................... ... 31
SELECTIVE PARTS ......................................... ... 32

FFD-2
PRECAUTIONS
Revision: November 20092006 QX56
PRECAUTIONSPFP:00001
Precautions for Servicing Front Final DriveEDS0044X

Before starting diagnosis of the vehicle, understand the symptoms well. Perform correct and systematic
operations.

Check for the correct installation status prior to removal or disassembly. When matching marks are
required, be certain they do not interfere with the function of the parts they are applied to.

Overhaul should be done in a clean work area, a dust proof area is recommended.

Before disassembly, completely remove sand and mud from the exterior of the unit, preventing them from
entering into the unit during disassembly or assembly.

Always use shop paper for cleaning the inside of components.

Avoid using cotton gloves or a shop cloth to prevent the entering of lint.

Check appearance of the disassembled parts for damage, deformation, and abnormal wear. Replace
them with new ones if necessary.

Gaskets, seals and O-rings should be replaced any time the unit is disassembled.

Clean and flush the parts sufficiently and blow them dry.

Be careful not to damage sliding surfaces and mating surfaces.

When applying sealant, remove the old sealant from the mating surface; then remove any moisture, oil,
and foreign materials from the application and mating surfaces.

In principle, tighten nuts or bolts gradually in several steps working diagonally from inside to outside. If a
tightening sequence is specified, observe it.

During assembly, observe the specified tightening torque.

Add new differential gear oil, petroleum jelly, or multi-purpose grease, as specified.

DIFFERENTIAL GEAR OILFFD-7
CE F
G H
I
J
K L
M A
B
FFD
Revision: November 2009 2006 QX56
DIFFERENTIAL GEAR OILPFP:KLD30
Changing Differential Gear OilEDS00451
DRAINING
1. Stop the engine.
2. Remove the drain plug from the front final drive assembly to drain the differential gear oil.
3. Install the drain plug with sealant applied on the threads to the front final drive assembly. Tighten to the
specified torque. Refer to FFD-14, "
COMPONENTS" .

Use High Performance Thread Sealant or equivalent. Refer to GI-46, "Recommended Chemical Prod-
ucts and Sealants" .
FILLING
1. Remove the filler plug from the front final drive assembly.
2. Fill the front final drive assembly with new differential gear oil
until the level reaches the specified level near the filler plug hole.
3. Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer
to FFD-14, "
COMPONENTS" .

Use High Performance Thread Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants" .
Checking Differential Gear OilEDS00452
DIFFERENTIAL GEAR OIL LEAKAGE AND LEVEL
1. Make sure that differential gear oil is not leaking from the front final drive assembly or around it.
2. Check the differential gear oil level from the filler plug hole as
shown.
CAUTION:
Do not start engine while checking differential gear oil level.
3. Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer
to FFD-14, "
COMPONENTS" .

Use High Performance Thread Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants" .
Differential gear oil
grade and capacity
: Refer to
MA-11, "
Fluids
and Lubricants" .
LDIA0176E
LDIA0176E

FRONT OIL SEALFFD-9
CE F
G H
I
J
K L
M A
B
FFD
Revision: November 2009 2006 QX56
INSTALLATION
1. Apply multi-purpose grease to the lips of the new front oil seal.
Then drive the new front oil seal in evenly to the gear carrier
using Tool.
CAUTION:

Do not reuse front oil seal.

Do not incline the new front oil seal when installing.

Apply multi-purpose grease to the lips of the new front oil
seal.
2. Install the companion flange to the drive pinion while aligning the matching marks.
3. Apply anti-corrosive oil to the threads of the drive pinion and the seating surface of the new drive pinion lock nut. Then adjust the
drive pinion lock nut tightening torque using Tool A, and check
the total preload torque using Tool B.

The total preload torque should be within the total preload
torque specification. When not replacing the collapsible
spacer, it should also be equal to the measurement taken dur-
ing removal plus an additional 0.56 N·m (0.06 Kg-m, 5 in-lb).

If the total preload torque is low, tighten the drive pinion lock
nut in 6.8 N·m (0.69 Kg-m, 5ft-lb) increments until the total
preload torque is met.
CAUTION:

Do not reuse drive pinion lock nut.

Apply anti-corrosive oil to the threads of the drive pinion
and the seating surface of the new drive pinion lock nut.

Adjust the drive pinion lock nut tightening torque to the
lower limit first. Do not exceed the drive pinion lock nut
specified torque. Refer to FFD-14, "
COMPONENTS" .

Do not loosen drive pinion lock nut to adjust the total preload torque. If the drive pinion lock nut
torque or the total preload torque exceeds the specifications, replace the collapsible spacer and
tighten it again to adjust. Refer to FFD-14, "
Disassembly and Assembly" .

After adjustment, rotate drive pinion back and forth 2 to 3 times to check for unusual noise, rota-
tion malfunction, and other malfunctions.
4. Installation of the remaining components is in the reverse order of removal. CAUTION:
Check the differential gear oil level after installation. Refer to FFD-7, "
DIFFERENTIAL GEAR OIL" .
Tool number : KV38100500 (J-25273)
BDIA0003E
Tool number A: KV38108300 ( — )
B: ST3127S000 (J-25765-A)
Total preload torque: Refer to FFD-15, "
To ta l P r e -
load Torque" .
WDIA0381E

FFD-10
SIDE OIL SEAL
Revision: November 20092006 QX56
SIDE OIL SEALPFP:33142
Removal and InstallationEDS00454
REMOVAL
1. Remove the front final drive assembly. Refer to FFD-12, "REMOVAL" .
2. Remove the differential side shaft and differential side flange using suitable tool.
3. Place a small hole in the side oil seal case using suitable tool.
4. Remove the side oil seal using Tool as shown.
INSTALLATION
1. Apply multi-purpose grease to the lips of the new side oil seal. Then drive the new side oil seal in evenly to the gear carrier using suitable tool.
CAUTION:

Do not reuse side oil seal.

Do not incline the new side oil seal when installing.

Apply multi-purpose grease to the lips of the new side oil seal.
2. Installation of the remaining components is in the reverse order of removal. CAUTION:
Check the differential gear oil level after installation. Refer to FFD-7, "
DIFFERENTIAL GEAR OIL" .
BDIA0006E
LDIA0129E
Tool number : SP8P
LDIA0130E