INFINITI QX56 2007 Factory Service Manual

FFD-22
< SERVICE INFORMATION >
FRONT FINAL DRIVE ASSEMBLY
7. Place a small hole in the front oil seal case using suitable tool.
8. Remove the front oil seal using Tool as shown.
9. Remove the drive pinion front bearing inner race.
10. Remove the drive pinion front bearing outer race using Tool as
shown. Locate the driver on the back edge of the drive pinion
front bearing outer race, then drive the drive pinion front bearing
outer race out.
CAUTION:
Do not damage gear carrier.
11. Remove the drive pinion rear bearing outer race using Tool as
shown. Locate the driver on the back edge of the drive pinion
rear bearing outer race, then drive the drive pinion rear bearing
outer race out.
CAUTION:
Do not damage gear carrier.
INSPECTION AFTER DISASSEMBLY
Clean the disassembled parts. Then inspect the parts for wear or damage. If wear or damage are found, follow
the measures below.
Drive Pinion and Drive Gear
• If the drive pinion and drive gear teeth do not mesh or line-up correctly, determine the cause and adjust,
repair, or replace as necessary.
• If the drive pinion or drive gear are worn, cracked, damaged, pitted or chipped (by friction) noticeably,
replace with new drive pinion and drive gear.
LDIA0129E
Tool number : SP8P
LDIA0130E
Tool number A: C-4171
B: D-103
LDIA0131E
Tool number A: C-4171
B: C-4307
LDIA0132E

FRONT FINAL DRIVE ASSEMBLY
FFD-23
< SERVICE INFORMATION >
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• Drive pinion and drive gear are supplied in matched sets only. Matching numbers on both drive pinion and
drive gear are etched for verification. If a new drive pinion and drive gear set are being used, verify the num-
bers of each drive pinion and drive gear before proceeding with assembly.
Bearing
• If bearings are chipped (by friction), pitted, worn, rusted, scratched, or unusual noise is coming from bearing,
replace with new bearing assembly (as a new set).
• Bearing must be replaced with a new one whenever disassembled.
Side Gear and Pinion Mate Gear
• If any cracks or damage are found on the surface of the teeth, replace with new one.
• If any worn or chipped marks are found on the side of the side gear and pinion mate gear which contact the
thrust washer, replace with new one.
• Replace both side gear and pinion mate gear as a set when replacing side gear or pinion mate gear.
Side Gear Thrust Washer and Pinion Mate Thrust Washer
• If any chips (by friction), damage, or unusual wear are found, replace with new one.
Gear Carrier
• If any wear or cracks are found on the contact sides of gear carrier, replace with new one.
Companion Flange
• If any chips (about 0.1mm, 0.004 in) or other damage on the companion flange surface which contacts the
front oil seal lips are found, replace with new one.
ADJUSTING AND SELECTING WASHERS
Side Gear Back Clearance
• Assemble the differential parts if they are disassembled.
1. Place the differential case straight up so that the side gear to be
measured is upward.
PDIA0460E

FFD-24
< SERVICE INFORMATION >
FRONT FINAL DRIVE ASSEMBLY
2. Using feeler gauges, measure the clearance between the side
gear back and differential case at three different points, while
rotating the side gear. Average the three readings to calculate
the clearance. (Measure the clearance of the other side as well.)
• If the side gear back clearance is outside of the specification,
use a thicker or thinner side gear thrust washer to adjust.
Refer to FFD-31, "
Inspection and Adjustment".
CAUTION:
• Insert feeler gauges with the same thickness on both
sides to prevent side gear from tilting.
• Each gear should rotate smoothly without excessive
resistance during differential motion.
• Select a side gear thrust washer for right and left individu-
ally.
NOTE:
Side gear back clearance is clearance between side gear and differential case for adjusting side gear
backlash.
Drive Pinion Height
• Drive gear and drive pinion are supplied in matched sets only.
Matching numbers on both drive pinion and drive gear are etched
for verification. If a new gear set is being used, verify the numbers
of each drive pinion and drive gear before proceeding with assem-
bly.
• The mounting distance from the centerline of the drive gear to the back face of the drive pinion for the M205
final drive assembly is 103.5 mm (4.0748 inches).
On the button end of each drive pinion, there is etched a plus (+) number, a minus (-) number, or a zero (0),
which indicates the best running position for each particular gear set. This dimension is controlled by a
selective drive pinion height adjusting washer between the drive pinion rear bearing inner race and drive pin-
ion.
For example: If a drive pinion is etched m+8 (+3), it would require 0.08 mm (0.003 inch) less drive pinion
height adjusting washer than a drive pinion etched “0”. This means decreasing drive pinion height adjusting
washer thickness; increases the mounting distance of the drive pinion to 103.6 mm (4.0778 inches). If a
drive pinion is etched m-8 (-3), it would require adding 0.08mm (0.003 inch) more to the drive pinion height
adjusting washer than would be required if the drive pinion were etched “0”. By adding 0.08 mm (0.003 inch),
the mounting distance of the drive pinion was decreased to 103.4 mm (4.0718 inches) which is just what a
m-8 (-3) etching indicated.
• To change the drive pinion height, use different drive pinion height adjusting washers which come in different
thickness.
• Use the following tables as a guide for selecting the correct drive pinion height adjusting washer thickness to
add or subtract from the old drive pinion height adjusting washer.Side gear back clearance: 0.20 mm (0.0079 in) or less
If the side gear back clearance is greater than
specification:
Use a thicker side gear thrust washer.
If the side gear back clearance is less than spec-
ification:
Use a thinner side gear thrust washer.
PDIA0576E
SDIA2241E

FRONT FINAL DRIVE ASSEMBLY
FFD-25
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ASSEMBLY
Drive Pinion Assembly
1. Install drive pinion rear bearing outer race using Tools.
2. Install drive pinion front bearing outer race using Tools.
3. Select drive pinion height adjusting washer.
OLD DRIVE
PINION
MARKINGNEW DRIVE PINION MARKING mm (in)
-10 (-4) -8 (-3) -5 (-2) -3 (-1) 0 (0) +3 (+1) +5 (+2) +8 (+3) +10 (+4)
+10 (+4)+0.20
(+0.008)+0.18
(+0.007) +0.15
(+0.006)+0.13
(+0.005)+0.10
(+0.004)+0.08
(+0.003)+0.05
(+0.002)+0.02
(+0.001)0
(0)
+8 (+3)+0.18
(+0.007)+0.15
(+0.006)+0.13
(+0.005)+0.10
(+0.004)+0.08
(+0.003)+0.05
(+0.002)+0.02
(+0.001)0
(0)-0.02
(-0.001)
+5 (+2)+0.15
(+0.006)+0.13
(+0.005)+0.10
(+0.004)+0.08
(+0.003)+0.05
(+0.002)+0.02
(+0.001)0
(0)-0.02
(-0.001)-0.05
(-0.002)
+3 (+1)+0.13
(+0.005)+0.10
(+0.004)+0.08
(+0.003)+0.05
(+0.002)+0.02
(+0.001)0
(0)-0.02
(-0.001)-0.05
(-0.002)-0.08
(-0.003)
0 (0)+0.10
(+0.004)+0.08
(+0.003)+0.05
(+0.002)+0.02
(+0.001)0
(0)-0.02
(-0.001)-0.05
(-0.002)-0.08
(-0.003)-0.10
(-0.004)
-3 (-1)+0.08
(+0.003)+0.05
(+0.002)+0.02
(+0.001)0
(0)-0.02
(-0.001)-0.05
(-0.002)-0.08
(-0.003)-0.10
(-0.004)-0.13
(-0.005)
-5 (-2)+0.05
(+0.002)+0.02
(+0.001)0
(0)-0.02
(-0.001)-0.05
(-0.002)-0.08
(-0.003)-0.10
(-0.004)-0.13
(-0.005)-0.15
(-0.006)
-8 (-3)+0.02
(+0.001)0
(0)-0.02
(-0.001)-0.05
(-0.002)-0.08
(-0.003)-0.10
(-0.004)-0.13
(-0.005)-0.15
(-0.006)-0.18
(-0.007)
-10 (-4)0
(0)-0.02
(-0.001)-0.05
(-0.002)-0.08
(-0.003)-0.10
(-0.004)-0.13
(-0.005)-0.15
(-0.006)-0.18
(-0.007)-0.20
(-0.008)
Tool number A: ST30901000
B: KV40105230
SDIA2251E
Tool number A: ST35271000
B: KV40104810
SDIA2252E

FFD-26
< SERVICE INFORMATION >
FRONT FINAL DRIVE ASSEMBLY
4. Install the selected drive pinion height adjusting washer to the
drive pinion. Press the drive pinion rear bearing inner race to it
using Tool.
CAUTION:
Do not reuse drive pinion rear bearing inner race.
5. Install the collapsible spacer to the drive pinion.
CAUTION:
Do not reuse collapsible spacer.
6. Apply differential gear oil to the drive pinion rear bearing, and
install the drive pinion assembly to the gear carrier.
7. Apply differential gear oil to the drive pinion front bearing, and
install the drive pinion front bearing inner race to the drive pinion
assembly.
CAUTION:
Do not reuse drive pinion front bearing inner race.
8. Apply multi-purpose grease to the lips of the new front oil seal.
Then drive the new front oil seal in evenly using Tools.
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.
9. Install the companion flange to the drive pinion while aligning the
matching marks. Tap the companion flange until fully seated
using suitable tool.Tool number : C-4040
SDIA2253E
PDIA0708E
Tool number A: KV38100500 (J-25273)
B: KV38102200 ( — )
PDIA0717E
SDIA2266E

FRONT FINAL DRIVE ASSEMBLY
FFD-27
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10. 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 drive pinion bearing preload torque using Tool B.
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.
• If the drive pinion bearing preload torque exceeds the
specified value, replace collapsible spacer and tighten it
again to adjust. Do not loosen drive pinion lock nut to
adjust the drive pinion bearing preload torque.
• After adjustment, rotate drive pinion back and forth 2 to 3
times to check for unusual noise, rotation malfunction,
and other malfunctions.
11. Check companion flange runout.
12. Install the differential case assembly.
Differential Assembly
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.
2. Install the side gears and side gear thrust washers into the dif-
ferential case.
3. Install the pinion mate thrust washers to the two pinion mate
gears. Then install the pinion mate gears with the pinion mate
thrust washers by aligning them in diagonally opposite positions
and rotating them into the differential case.Tool number A: KV38108300 (J-44195)
B: ST3127S000 (J-25765-A)
Drive pinion bearing preload torque:
2.3 - 3.4 N·m (24 - 34 kg-cm, 21 - 30 in-lb)
WDIA0382E
SDIA0193J
SDIA2025E

FFD-28
< SERVICE INFORMATION >
FRONT FINAL DRIVE ASSEMBLY
4. Install the pinion mate shaft and align the lock pin hole on the
pinion mate shaft with the lock pin hole on the differential case.
5. Measure the side gear end play. If necessary, select the appro-
priate side gear thrust washers.
6. Drive a new lock pin into the pinion mate shaft until it is flush
with the differential case using suitable tool.
CAUTION:
Do not reuse lock pin.
7. Align the matching mark of the differential case with the mark of
the drive gear, then place the drive gear onto the differential
case.
8. Install and tighten the new drive gear bolts to the specified
torque.
CAUTION:
• Make sure the drive gear back and threaded holes are
clean.
• Do not reuse drive gear bolts.
• Tighten new drive gear bolts in a crisscross pattern.
9. Press the new side bearing inner races to the differential case
using Tools.
CAUTION:
Do not reuse side bearing inner races.
SDIA0195J
SPD030
SDIA2593E
SDIA2239E
Tool number A: KV38100300 (J-25523)
B: ST33081000
SPD353

FRONT FINAL DRIVE ASSEMBLY
FFD-29
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10. Install side bearing adjusters into gear carrier.
11. Apply differential gear oil to the side bearings, and install the dif-
ferential case assembly with the side bearing outer races into
the gear carrier.
CAUTION:
Do not reuse side bearing outer race when replacing side
bearing inner race (replace as a set).
12. Install the side bearing caps with the matching marks aligned.
NOTE:
Do not tighten at this step. This allows further tightening of side
bearing adjusters.
13. Tighten each side bearing adjuster alternately turning drive gear.
14. Check and adjust tooth contact, backlash, drive gear runout and total preload torque.
Recheck above items.
• After adjusting tooth contact and backlash secure side bearing
adjuster with screws and tighten side bearing cap bolt to the
specified torque.
15. 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.
SPD527
PDIA0700E
SDIA2265E
SDIA2263E

FFD-30
< SERVICE INFORMATION >
FRONT FINAL DRIVE ASSEMBLY
16. Install the extension tube with a new O-ring.
CAUTION:
• Do not reuse O-ring.
• If the extension tube is being replaced, install a new axle
shaft bearing.
17. Apply 3 mm (0.12 in) bead of sealant to the mating surface of
the carrier cover as shown.
• Use Genuine Silicone RTV or equivalent. Refer to GI-45,
"Recommended Chemical Product and Sealant".
CAUTION:
Remove any old sealant adhering to the mating surfaces.
Also remove any moisture, oil, or foreign material adhering
to the application and mating surfaces.
18. Install the carrier cover to the gear carrier. Tighten the bolts to
the specified torque.
19. Install side shaft and side flange.
SDIA3205E
SDIA3204E

SERVICE DATA AND SPECIFICATIONS (SDS)
FFD-31
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SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationINFOID:0000000003532595
Inspection and AdjustmentINFOID:0000000003532596
DRIVE GEAR RUNOUT
Unit: mm (in)
SIDE GEAR CLEARANCE
Unit: mm (in)
PRELOAD TORQUE
Unit: N·m (kg-m, in-lb)
BACKLASH
Unit: mm (in)
COMPANION FLANGE RUNOUT
Unit: mm (in)
SELECTIVE PARTS
Drive Pinion Height Adjusting Washer
Applied modelVK56E
Final drive modelM205
Gear ratio3.357
Number of teeth (Drive gear/Drive pinion) 47/14
Differential gear oil capacity (Approx.)
1.6 (3 3/8 US pt, 2 7/8 Imp pt)
Number of pinion gears2
Drive pinion adjustment spacer type Collapsible
Item Runout limit
Drive gear back face 0.08 (0.0031) or less
Item Specification
Side gear back clearance (Clearance between side gear and dif-
ferential case for adjusting side gear backlash)0.20 (0.0079) or less
(Each gear should rotate smoothly without excessive resistance
during differential motion.)
Item Specification
Drive pinion bearing preload torque 2.3 - 3.4 (0.23 - 0.35, 21 - 31)
Total preload torque
(Total preload torque = drive pinion bearing preload torque + side
bearing preload torque).2.98 - 4.76 (0.31 - 0.48, 27 - 42)
Item Specification
Drive gear to drive pinion backlash 0.12 - 0.20 (0.0050 - 0.0079)
Item Runout limit
Companion flange face 0.10 (0.0039) or less
Companion flange inner side 0.13 (0.0051) or less