differential INFINITI QX56 2009 Factory Workshop Manual

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1. Fit a dial indicator to the drive gear back face.
2. Rotate the drive gear to measure runout.
 If the runout is outside of the limit , check the condition of the drive
gear assembly. Foreign material may be caught between the drive
gear and differential case, or the differential case or drive gear may
be deformed.
CAUTION:
Replace drive gear and drive pinion as a set.
Tooth Contact
1. Apply red lead to the drive gear. NOTE:
Apply red lead to both faces of thr ee to four gears, at four loca-
tions evenly spaced on the drive gear.
2. 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 dri ve side and reverse side.
3. If the tooth contact is improper ly adjusted, follow the procedure
below to adjust the pinion height (dimension X). Runout limit : Refer to
DLN-270, "Inspection
and Adjustment"
SPD886
SPD357
SDIA0570E
SDIA0517E
Revision: December 20092009 QX56

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1. Rotate companion flange and check for runout on the outer face of the companion flange using suitable tool.
2. If the runout is outside of the runout limit, follow the procedure
below to adjust.
a. Rotate the companion flange on the drive pinion by 90 °, 180 °
and 270 ° while checking for the position where the runout is
minimum.
b. If the runout is still outside of the runout limit after the companion
flange has been rotated on the drive pinion, possible c ause could be an assembly malfunction of drive pin-
ion and drive pinion bearing or a malfunctioning drive pinion bearing.
c. If the runout is still outside of t he runout limit after repair of the assembly of drive pinion and drive pinion
bearing or drive pinion bearing, replace the companion flange.
DISASSEMBLY
Side Flange
1. Drain the differential gear oil if necessary.
2. Remove the side flange using Tools.
3. Remove the side oil seal using suitable tool.
CAUTION:
Do not to damage gear carrier.
Differential Assembly
1. Remove the side flanges.
2. Remove the carrier cover bolts.
3. Remove the carrier cover bolts and separate the carrier coverfrom the gear carrier using Tool.
CAUTION:
 Do not damage the mating surface.
 Do not insert flat-bladed screw driver, this will damage the
mating surface. Runout limit : Refer to
DLN-270, "Inspection and
Adjustment"
WDIA0231E
Tool numbers A: KV40104100 ( — )
B: ST36230000 (J-25840-A)
WDIA0115E
LDIA0109E
Tool number : KV10111100 (J-37228)
WDIA0123E
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DLN-258
< DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
REAR FINAL DRIVE
4. Mount the carrier on the Tool using two 45 mm (1.77 in) spacers.
5. For proper reinstallation, paint matching marks on one side of
the side bearing cap and gear carrier.
CAUTION:
 For matching marks, use paint. Do not damage side bear-ing cap or gear carrier.
 Side bearing caps are line-board during manufacture. The matching marks are used to re install them in their original
positions.
6. Remove the side bearing caps.
7. Lift the differential case assembly out using Tool.
CAUTION:Tool number : KV38100800 (J-25604-01)
SPD888
SDIA1795E
S-PD343
Tool number : HT72400000 ( — )
S-PD344
Revision: December 20092009 QX56

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 Keep side bearing outer races together with inner race. Do not mix them up.
 Keep side bearing adjusting washers together with side
bearings.
8. Remove the side bearing inner races using Tools. CAUTION:
 Engage Tool jaws in bearing groove to prevent damage.
 Place copper plates between the side bearing and drivegear and the vise to prevent damage.
 Do not remove side bearing inner race unless it is being
replaced.
9. For proper reinstallation, paint matching marks on the differential case and drive gear.
CAUTION:
Use paint for matching marks. Do not damage differential
case or drive gear.
10. Remove the drive gear bolts.
11. Tap the drive gear off the differential case using suitable tool. CAUTION:
Tap evenly all around to keep drive gear from bending.
12. Remove the lock pin of the pinion mate shaft from the drive gear side using suitable tool.
SPD919
Tool number A: ST3306S001 ( — )
B: ST33061000 (J-8107-2)
SPD920
PDIA0496E
WDIA0132E
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DLN-260
< DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
REAR FINAL DRIVE
13. Remove the pinion mate shaft.
14. Turn the pinion mate gear, then remove the pinion mate gear,
pinion mate thrust washer, side gear and side gear thrust
washer from the differential case.
Drive Pinion Assembly
1. Remove the differential assembly.
2. Remove the drive pinion lock nut using suitable tool.
3. Put matching marks on the companion flange and drive pinion using paint.
CAUTION:
Use paint to make the matching marks. Do not damage the companion flange or drive pinion.
4. Remove the companion flange using suitable tool.
SDIA0031J
SDIA0032J
SDIA1144E
SDIA1132E
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DLN-262
< DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
REAR FINAL DRIVE
Gear Carrier
 If any wear or cracks are found on the contac
t 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 part s if they are disassembled.
1. Place the differential case straight up so that the side gear to be measured is upward.
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 clearanc e 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 DLN-270, "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 individually.
NOTE:
Side gear back clearance is clearance between side gear and differential case for adjusting side gear
backlash.
Side Bearing Preload Torque
 A selection of side bearing adjusting washers is r equired for successful completion of this procedure.
PDIA0460E
Side gear back
clearance: Refer to
DLN-270, "Inspection
and Adjustment"
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
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1. 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 ou ter race when replacing side
bearing inner race (replace as a set).
2. Insert the left and right original side bearing adjusting washers in place between side bearings and gear carrier.
3. Align the matching mark on the side bearing cap with the match- ing mark on the gear carrier.
4. Install the side bearing caps and tighten the side bearing cap bolts to the specified torque.
5. Turn the differential assembly several times to seat the side bearings.
6. To determine side bearing preload torque, measure the pulling force of the differential assemb ly at the drive gear bolt using
Tool.
NOTE:
If pulling force of the differential assembly at the drive gear bolt
is within specification, side bearing preload torque will also be
within specification. Refer to DLN-270, "Inspection and Adjustment"
.
SPD527
SPD924
SDIA1795E
Tool number : — (J-8129)
Specification : Refer to DLN-270, "Inspection and
Adjustment"
SPD194A
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4. Assemble the collapsible spacer to the drive pinion. CAUTION:
Do not reuse collapsible spacer.
5. Apply differential gear oil to the drive pinion rear bearing, and install the drive pinion assembly to the gear carrier.
6. 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.
7. Press the drive pinion front bearing inner race to the drive pinion as far as drive pinion lock nut can be tightened using suitable
spacer.
8. Apply multi-purpose grease to the lips of the new front oil seal.
Then drive the new front oil seal in evenly until it becomes flush
with the gear carrier using Tool.
CAUTION:
 Do not reuse front oil seal.
 Do not incline the new fron t oil seal when installing.
 Apply multi-purpose grease to th e lips of the new front oil
seal.
9. Install the companion flange to the drive pinion while aligning the matching marks.
PDIA0492E
SPD896
Tool number : ST15310000 ( — )
PDIA0563E
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DLN-266
< DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
REAR FINAL DRIVE
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 suitable 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 th e 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 collap sible spacer and tighten it
again to adjust. Do not lo osen drive pinion lock nut to
adjust the drive pinion bearing preload torque.
 After adjustment, rotate dri ve pinion back and forth 2 to 3
times to check for unusual no ise, 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.
CAUTION:
Make sure that the circular clip is installed to side gears.
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 B: ST3127S000 (J-25765-A)
Drive pinion bearing preload torque
: Refer to DLN-270, "Inspection and Adjustment"
WDIA0379E
SDIA0193J
SDIA2025E
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4. Align the lock pin hole on the differential case with the lock pin hole on the pinion mate shaft, and install the pinion mate shaft.
5. Measure the side gear end play. If necessary, select the appro- priate side gear thrust washers. Refer to DLN-270, "Inspection
and Adjustment".
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. Apply thread locking sealant into the threaded holes of the drive gear and install the bolts.
 Use Genuine Medium Strength Thread Locking Sealant orequivalent. Refer to GI-15, "Recommended Chemical Prod-
ucts and Sealants".
CAUTION:
Make sure the drive gear b ack and threaded holes are
clean.
9. Tighten the drive gear bolts to the specified torque. After tighten- ing the drive gear bolts to the specified torque, tighten an addi-
tional 34 ° using Tool (A).
CAUTION:
 Always use Tool. Avoid tighte ning based on visual check
alone.
 Tighten drive gear bolts in a crisscross pattern.
SDIA0195J
WDIA0131E
SDIA2593E
SDIA2594E
Tool number : KV10112100-A (BT-8653-A)
AWBIA0722ZZ
Revision: December 20092009 QX56