INFINITI QX56 2006 Factory Service Manual

RFD-16
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
ASSEMBLY INSPECTION AND ADJUSTMENT

Drain the differential gear oil before inspection and adjustment. Refer to RFD-8, "DIFFERENTIAL GEAR
OIL" .

Remove and install the carrier cover as necessary for inspection and adjustment. Refer to RFD-12, "CAR-
RIER COVER" .
Total Preload Torque
1. Remove the side flanges if necessary. Refer to RFD-19, "Side Flange" .
CAUTION:
The side flanges shaft must removed in order to measure total preload torque.
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 the total preload torque using Tool.
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.
CAUTION:
Select a side bearing adjusting washer for right and left individually.
1. Drive pinion lock nut 2. Companion flange 3. Front oil seal
4. Drive pinion front bearing 5. Collapsible spacer 6. Drive pinion rear bearing
7. Drive pinion height adjusting washer 8. Drive pinion 9. Gear carrier
10. Drive gear 11. Pinion mate shaft 12. Lock pin
13. Pinion mate gear 14. Pinion mate thrust washer 15. Side gear
16. Side gear thrust washer 17. Differential case 18. Side bearing
19. Side bearing adjusting washer 20. Bearing cap 21. Carrier cover
22. Filler plug 23. Drain plug 24. Side oil seal
Tool number : ST3127S000 (J-25765-A)
Total preload torque:
2.05 - 4.11 N·m (0.21 - 0.42 kg-m, 19 - 36 in-lb)
SPD884
If the total preload torque is greater than specificationOn drive pinion bearings: Replace the collapsible spacer.
On side bearings: Use thinner side bearing adjusting washers by the same amount on each side. Refer to RFD-33, "
Side Bearing Adjusting
Washer" .
If the total preload torque is less than specification On drive pinion bearings: Tighten the drive pinion lock nut.
On side bearings: Use thicker side bearing adjusting washers by the same amount on each side. Refer to RFD-33, "
Side Bearing Adjust-
ing Washer" .

REAR FINAL DRIVE ASSEMBLYRFD-17
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Drive Gear Runout
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 three 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 drive side and reverse side.
3. If the tooth contact is improperly adjusted, follow the procedure below to adjust the pinion height (dimension X).Runout limit : 0.05 mm (0.0020 in) or less
SPD886
SPD357
SDIA0570E
SDIA0517E

RFD-18
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56

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 RFD-33, "
Drive Pinion Height Adjusting Washer" .

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 RFD-33, "
Drive Pinion Height Adjusting Washer" .
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 thick-
ness 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
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 cause
PDIA0440E
PDIA0441E
Backlash : 0.13 - 0.18 mm (0.0051 - 0.0070 in)
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 tooth side by the same amount.
Refer to RFD-33, "
Side Bearing Adjusting Washer" .
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 RFD-33, "
Side Bearing Adjusting Washer" .
SPD513
Runout limit : 0.08 mm (0.0031 in) or less
WDIA0231E

REAR FINAL DRIVE ASSEMBLYRFD-19
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Revision: November 2009 2006 QX56
could be an assembly malfunction of drive pinion and drive pinion bearing or a malfunctioning drive pinion
bearing.
c. If the runout is still outside of the 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. Refer to RFD-19, "Side Flange" .
2. Remove the carrier cover bolts.
3. Remove the carrier cover bolts and separate the carrier cover from the gear carrier using Tool.
CAUTION:

Do not damage the mating surface.

Do not insert flat-bladed screwdriver, this will damage the
mating surface.
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 reinstall them in their
original positions.Tool numbers A: KV40104100 ( — )
B: ST36230000 (J-25840-A)
Tool number : KV10111100 (J-37228)
WDIA0123E
Tool number : KV38100800 (J-25604-01)
SPD888
SDIA1795E

RFD-20
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
6. Remove the side bearing caps.
7. Lift the differential case assembly out using Tool.
CAUTION:

Keep side bearing outer races together with inner race.
Do not mix them up.

Keep side bearing adjusting washers together with side
bearings.
S-PD343
Tool number : HT72400000 ( — )
S-PD344
SPD919

REAR FINAL DRIVE ASSEMBLYRFD-21
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Revision: November 2009 2006 QX56
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 drive
gear 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.
13. Remove the pinion mate shaft. Tool number A: ST3306S001 ( — )
B: ST33061000 (J-8107-2)
SPD920
PDIA0496E
WDIA0132E
SDIA0031J

RFD-22
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
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. Refer to RFD-19, "Differential Assembly" .
2. Remove the drive pinion lock nut using 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.
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.
SDIA0032J
Tool number : KV40104000 ( — )
SDIA1144E
SDIA1132E
SPD892

REAR FINAL DRIVE ASSEMBLYRFD-23
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Revision: November 2009 2006 QX56
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 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.

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
numbers 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 bear-
ing, 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.Tool number: : ST30021000 ( — )
S-PD179
SDIA0817E

RFD-24
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
ADJUSTING AND SELECTING WASHERS
Side Gear Back Clearance

Assemble the differential parts if they are disassembled. Refer to RFD-28, "Differential Assembly" .
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 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 RFD-32, "
Side Gear Thrust Washer" .
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 individ-
ually.
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 required for successful completion of this procedure.
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 outer race when replacing side
bearing inner race (replace as a set).
PDIA0460E
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
specification: Use a thinner side gear thrust washer.
PDIA0576E
SPD527

REAR FINAL DRIVE ASSEMBLYRFD-25
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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. Refer to RFD-15, "
COMPO-
NENTS" .
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 assembly at the drive gear bolt using
To o l .
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 RFD-32, "
PRELOAD TORQUE" .
7. If the pulling force is outside the specification, use a thicker or thinner side bearing adjusting washer to adjust. Refer to RFD-
33, "Side Bearing Adjusting Washer" .
CAUTION:
Select a side bearing adjusting washer for right and left
individually.
8. Record the total amount of washer thickness required for the correct side bearing preload torque.
SPD924
SDIA1795E
Tool number : — (J-8129)
Specification : 34.2 - 39.2 N (3.5 - 4.0 kg, 7.7 - 8.8 lb) of pulling force at the drive gear bolt
SPD194A
If the pulling force is less than the specification:
Use a thicker side bearing adjusting washer.
If the pulling force is greater than the specification: Use a thinner side bearing adjusting washer.
SPD772