INFINITI QX56 2009 Factory Service Manual

REAR FINAL DRIVEDLN-255
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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
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DLN-256
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REAR FINAL DRIVE
 If the tooth contact is near the face (face contact), or near the heel
(heel contact), use a thicker drive pinion height adjusting washers
to move the drive pinion closer to the drive gear.
Refer to DLN-270, "Inspection and Adjustment"
.
 If the tooth contact is near the flank (flank contact), or near the toe (toe contact), use a thinner drive pinion height adjusting washers to
move the drive pinion farther from the drive gear.
Refer to DLN-270, "Inspection and Adjustment"
.
Backlash
1. Fit a dial indicator to the drive gear face to measure the back-
lash.
 If the backlash is outside of the specification, change the thickness of the side bearing adjusting washers.
CAUTION:
Do not change the total thickness of side bearing adjusting washers as it will change the side bearing
preload torque.
Companion Flange Runout
PDIA0440E
PDIA0441E
Backlash : Refer to DLN-270, "Inspection and
Adjustment"
If the backlash is greater than specification:
Make side bearing adjusting washer thicker on drive
gear back side, and side bearing adjusting washer
thinner on drive gear toot h side by the same amount.
Refer to DLN-270, "Inspection and Adjustment"
.
If the backlash is less than specification: Make side bearing adjusting washer thinner on drive
gear back side, and side bearing adjusting washer
thicker on drive gear tooth side by the same amount.
Refer to DLN-270, "Inspection and Adjustment"
.
SPD513
Revision: December 20092009 QX56

REAR FINAL DRIVEDLN-257
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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
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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
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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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5. Press the drive pinion assembly (with rear inner bearing race and collapsible spacer) out of the gear carrier.
CAUTION:
Do not drop drive pinion assembly.
6. Remove the front oil seal. CAUTION:
Do not damage gear carrier.
7. Remove the drive pinion front bearing inner race.
8. Remove the drive pinion rear bearing inner race and drive pinion height adjusting washer using Tool.
9. Remove the drive pinion front and rear bearing outer races by tapping them uniformly using suitable tool.
CAUTION:
Do not damage gear carrier.
INSPECTION AFTER DISASSEMBLY
Clean the disassembled parts. Then inspect the parts fo r 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, crack ed, damaged, pitted or chipped (by friction) noticeably,
replace with new drive pinion and drive gear.
 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, rust ed, 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 surf ace 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 unus ual wear are found, replace with new one.
SPD892
Tool number: : ST30031000 (J-22912-01)
S-PD179
SDIA0817E
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DLN-262
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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
Revision: December 20092009 QX56

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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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DLN-264
< DISASSEMBLY AND ASSEMBLY >[REAR FINAL DRIVE: R230]
REAR FINAL DRIVE
7. If the pulling force is outside the specification, use a thicker or
thinner side bearing adjusting washer to adjust. Refer to DLN-
270, "Inspection and Adjustment".
CAUTION:
Select a side bearing adjust ing washer for right and left
individually.
8. Record the total amount of washer thickness required for the correct side bearing preload torque.
ASSEMBLY
Drive Pinion Assembly
1. Install the drive pinion front and rear bearing outer races using
Tools.
CAUTION:
Do not reuse drive pinion fron t and rear bearing outer race.
2. Select a drive pinion height adjusting washer. Refer to DLN-270, "Inspection and Adjustment"
.
3. 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:
 Install the drive pinion hei ght adjusting washer in the
proper direction as shown.
 Do not reuse drive pinion rear bearing inner race. If the pulling force is
less than the specification:
Use a thicker side bear ing adjusting washer.
If the pulling force is gr eater than the specification:
Use a thinner side bear ing adjusting washer.
SPD772
Tool number A: ST15310000 ( — )
B: ST35325000 ( — )
C: ST30621000 ( — )
SPD992
Tool number : ST30022000 ( — )
SPD377
Revision: December 20092009 QX56