INFINITI QX56 2004 Factory Service Manual

RFD-10
REAR FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
REAR FINAL DRIVE ASSEMBLYPFP:38300
Removal and InstallationEDS002JM
NOTE:

Insert the plastic end of the breather hose into the hole in the suspension member.

Insert the metallic end of the breather hose into the rear final drive cover with the blue paint mark facing
forward.
REMOVAL
1. Remove the rear propeller shaft from the rear final drive. Refer to PR-8, "Removal and Installation" .
CAUTION:
Do not impact or damage the rear propeller shaft.
2. Remove the rear stabilizer bar using power tool. Refer to RSU-41, "
REMOVAL" .
3. Remove the spare tire.
4. Disconnect the rear drive shaft from the rear final drive and position it out of the way using a suitable wire.
Refer to RAX-7, "
REMOVAL" .
5. Disconnect the breather hose from the rear final drive cover.
6. Position a suitable jack under the rear final drive case.
CAUTION:
Do not position the jack under the rear final drive cover (aluminum cover).
7. Remove the rear final drive bolts and nuts, and remove the rear final drive using the suitable jack.
1. Breather hose 2. Rear final drive assembly 3. Rear propeller shaft
4. Washer 5. Lower stopper 6. Rear drive shaft
7. Rear final drive assembly 8. Upper stopper
WDIA0190E

REAR FINAL DRIVE ASSEMBLY
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INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
After installation, check the final drive oil level. Refer to MA-24, "
Checking Final Drive Oil" .
ComponentsEDS002JN
R230 2–PINION
WDIA0294E
1. Drive pinion nut 2. Companion flange 3. Front oil seal
4. Pinion front bearing 5. Pinion bearing adjusting spacer (col-
lapsible spacer)6. Pinion rear bearing
7. 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

RFD-12
REAR FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
CAUTION:
Final drive pinion nut torque will be determined when adjusting the total preload. Refer to RFD-12,
"TOTAL PRELOAD" .
Pre-InspectionEDS002JO
Before disassembling the rear final drive, perform the following inspections.
TOTAL PRELOAD
1. Turn the drive pinion in both directions several times to set the
bearing rollers.
2. Check the total preload using Tool.
DRIVE GEAR TO DRIVE PINION BACKLASH
Check the drive gear to drive pinion backlash using a dial gauge at
several points as shown.
DRIVE GEAR RUNOUT
Check the runout of the drive gear using a dial gauge as shown.
19. Side bearing adjusting washer 20. Bearing cap 21. Rear cover
22. Filler plug 23. Drain plug 24. Side oil seal
Tool number : ST3127S000 (J-25765-A)
Total preload : 2.05 - 4.11 N·m (0.21 - 0.42 kg-m,
19 - 36 in-lb)
SPD8 84
Drive gear to drive pinion backlash : 0.13 - 0.18 mm
(0.0051 - 0.0070 in)
SPD5 13
Runout limit : 0.05 mm (0.0020 in) or less
SPD8 86

REAR FINAL DRIVE ASSEMBLY
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COMPANION FLANGE RUNOUT
Mount the dial gauge indicator so the dial gauge needle is positioned
on the propeller shaft mounting surface. Rotate the companion
flange and measure the runout as shown.

If runout is not within specification, remove the companion
flange, rotate 90° in relation to the drive pinion, and install the
companion flange using a new drive pinion nut. Tighten the drive
pinion nut to the minimum specified torque. Final drive pinion nut
torque will be determined when adjusting the total preload. Refer
to RFD-12, "
TOTAL PRELOAD" .
CAUTION:
The drive pinion nut is not reusable. Use a new drive pinion nut for installation.

If runout is not within specification after rotating the companion flange 90° on the drive pinion, replace the
companion flange. Recheck the companion flange runout.

If the new companion flange runout is not within specification, inspect the drive pinion bearing and the
drive pinion. Repair as necessary.
CAUTION:
Clean all of the rust and dirt off of the companion flange surface before measuring the companion
flange runout.
TOOTH CONTACT
Check the tooth contact. Refer to RFD-19, "TOOTH CONTACT" .
Disassembly and AssemblyEDS002JP
REMOVAL OF DIFFERENTIAL CASE ASSEMBLY
1. Use two 45 mm (1.77 in) spacers to mount the gear carrier on
Tool.
2. For installation, paint match marks on one side of the bearing
caps as shown.
NOTE:
Bearing caps are line-bored for initial assembly. Replace the
bearing caps in their original positions.Companion flange runout : 0.08 mm (0.003 in) or less
Tool number : KV40104000 ( — )
Drive pinion nut : 167 - 372 N·m (17 - 38 kg-m,
124 - 274 ft-lb)
WDIA0062E
Tool number : KV38100800 (J-25604–01)
SPD8 88
SPD8 89

RFD-14
REAR FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
3. Remove the bearing caps.
4. Lift the differential case assembly out of the gear carrier using
Tool.

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

Keep the adjusting washers together with the bearings.
REMOVAL OF DRIVE PINION ASSEMBLY
1. Apply match marks on the companion flange and drive pinion
using paint.
2. Loosen the drive pinion nut using Tool as shown.

Discard the drive pinion nut and use a new drive pinion nut for
installation.
S-PD3 43
Tool number : HT72400000 ( — )
S-PD3 44
SPD9 19
Tool number : KV40104000 ( — )
SDIA11 44 E

REAR FINAL DRIVE ASSEMBLY
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3. Remove the drive pinion together with the rear bearing inner
race and the bearing adjusting spacer.
4. Remove the front oil seal. Refer to RFD-6, "
FRONT OIL SEAL"
.
5. Remove the pinion front bearing inner race.
6. Remove the side oil seal. Refer to RFD-8, "
SIDE OIL SEAL" .
7. Remove the pinion bearing outer races using a suitable brass
drift.
8. Remove the pinion rear bearing inner race and the drive pinion
height adjusting washer using Tool.
SPD8 92
SDIA0817E
Tool number: : ST30021000 ( — )
S-PD1 79

RFD-16
REAR FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
DISASSEMBLY OF DIFFERENTIAL CASE ASSEMBLY
1. Remove the side bearing inner races using Tools.
CAUTION:
To prevent damage to the bearing, engage the puller jaws in
the groove.

Do not to mix the left and right side parts, clearly label the
parts during disassembly.
2. Loosen the drive gear bolts in a criss-cross pattern and remove
the bolts.
3. Tap the drive gear off the differential case using a soft hammer.

Tap evenly all around the drive gear to keep the drive gear
from binding.Tool number A: ST3306S001 ( — )
B: ST33061000 (J-8107-2)
SPD9 20
SPD0 22
SPD0 24

REAR FINAL DRIVE ASSEMBLY
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4. Drive the pinion mate shaft lock pin out using a suitable punch,
from the drive gear side.
INSPECTION
Contact Surfaces
1. Clean the disassembled parts in a suitable solvent and blow dry using compressed air.
2. If the following surfaces are burred or scratched, smooth them using an oil stone.

Differential case

Side gear

Pinion mate gear

Pinion mate shaft
Bearing
1. Thoroughly clean the bearing.
2. Check the bearing for wear, scratches, pitting, or flaking.
3. Check the tapered roller bearing for smooth rotation. If dam-
aged, replace the outer race and inner race as a set.
ADJUSTMENT OF DIFFERENTIAL CASE
Thrust Washer Selection
1. Install the side gears, pinion mate gears, and thrust washers into
the differential case.
SPD0 25
SPD7 15
SPD5 52

RFD-18
REAR FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
2. Install the pinion mate shaft into the differential case so that it
meets the lock pin holes.
3. Adjust the clearance between rear face of side gear and thrust
washer by selecting the correct thickness side gear thrust
washer. Refer to RFD-26, "
AVAILABLE SIDE GEAR THRUST
WAS HER S" .
Use two feeler gauges as shown to prevent the side gear from
leaning.
SIDE BEARING PRELOAD
NOTE:
A selection of carrier side bearing adjusting washers is required for completion of this procedure.
1. All parts must be clean. The bearings must be well lubricated
with light oil or DEXRON
TM type automatic transmission fluid.
2. Place the differential case assembly, with the side bearing outer
races installed, into the gear carrier.
3. Insert the left and right side bearing adjusting washers in posi-
tion between the side bearings and the gear carrier as shown.
SPD5 53
Side gear thrust washer and
differential case clearance: 0.20 mm (0.0079 in)
or less
SPD8 28
SPD5 27
SPD9 24

REAR FINAL DRIVE ASSEMBLY
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4. Install the side bearing caps in their original locations marked
during disassembly, and tighten the bearing cap bolts to specifi-
cation.
5. Turn the carrier several times to seat the bearings.
6. Measure the turning force of the carrier at the drive gear retain-
ing bolts using a suitable spring gauge.
7. If the turning force is not within the specification, adjust the turn-
ing force.

If the turning force is less than specification, install thicker
washers.

If the turning force is greater than specification, install thinner
washers.

Select the correct washer size to adjust the turning force.
Refer to RFD-27, "
SIDE BEARING ADJUSTING WASH-
ERS" .
8. Record the selected washer thickness required for the correct
carrier side bearing preload.
9. Remove the differential case assembly from the gear carrier
using Tool. Save the selected side bearing adjusting washers for
assembly.
TOOTH CONTACT
NOTE:
Checking the gear tooth contact pattern is necessary to verify that there is the correct tooth contact between
the drive gear and the drive pinion.
Hypoid gears which are not positioned properly may be noisy or have a short service life. Check the gear tooth
contact pattern to obtain the best contact for low noise and long service life.Bearing cap bolts : 93 N·m (9.5 kg-m, 69 ft.-lb)
SPD5 26
Drive gear bolt pulling force : 29.4 - 147 N (3 - 15 kg-f,
22 - 108 lb-f)
SPD1 94 A
SPD7 72
Tool number : HT72400000 ( — )
S-PD3 44