INFINITI QX56 2004 Factory Service Manual

FFD-10
SIDE OIL SEALS
Revision: August 20072004 QX56
SIDE OIL SEALSPFP:33142
Removal and InstallationEDS0035K
REMOVAL
1. Remove front final drive. Refer to FFD-12, "REMOVAL" .
2. Remove differential side shaft and side flange using suitable
tool.
3. Place a small hole in seal case, using suitable tool.
4. Install slide hammer tool as shown and remove seal.
5. Installation is in the reverse order of removal.
BDIA0006E
LDIA0129E
LDIA0130E

REAR COVER GASKET
FFD-11
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FFD
Revision: August 20072004 QX56
REAR COVER GASKETPFP:38320
Removal and InstallationEDS0035L
REMOVAL
1. Remove front final drive. Refer to FFD-12, "REMOVAL" .
2. Drain gear oil. Refer to MA-25, "
Changing Final Drive Oil" .
3. Remove rear cover using Tool.
INSTALLATION
1. Apply 3.2mm (0.126 in) bead of sealant to the rear cover using
Tool.

Use Genuine Silicone RTV sealant or equivalent. Refer to. GI-
45, "Recommended Chemical Products and Sealants" .
2. Install rear cover and tighten rear cover bolts in the order shown
FFD-11, "
INSTALLATION" .
3. Fill final drive with recommended gear oil. Refer to GI-45, "
Rec-
ommended Chemical Products and Sealants" .
4. Install front final drive. Refer to FFD-13, "
INSTALLATION" . Tool number : KV10111100 (J-37228)
Tool number :WS39930000 ( — )
SDIA3204E
WDIA0290E

FFD-12
FRONT FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
FRONT FINAL DRIVE ASSEMBLYPFP:38500
Removal and InstallationEDS0035M
REMOVAL
1. Remove front propeller shaft. Refer to PR-5, "REMOVAL" .
CAUTION:
Be careful not to damage spline, sleeve yoke and front oil seal when removing propeller shaft.
2. Separate LH and RH drive shafts from front final drive. Refer to FAX-7, "
REMOVAL" .
3. Remove front cross member.
4. Disconnect the vent hose.
1. Gear carrier assembly 2. Front cross member 3. Skid plate (If equipped)
SDIA3220E

FRONT FINAL DRIVE ASSEMBLY
FFD-13
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FFD
Revision: August 20072004 QX56
5. Support the front final drive with suitable jack and remove the
front final drive bolts. Carefully remove front final drive.
INSTALLATION
1. Install front final drive assembly.
2. Connect the vent hose.
3. Install the front cross member.
4. Install LH and RH drive shaft. Refer to FAX-8, "
INSTALLATION"
.
5. Install front propeller shaft. Refer to PR-5, "
INSTALLATION" .
BDIA0008E
Front final drive bolts : 182.5 N·m (19 kg-m, 135 ft-lb)
BDIA0008E

FFD-14
FRONT FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
Disassembly and AssemblyEDS0035N
COMPONENTS
1. Side bearing adjust nut 2. Side bearing 3. Side gear thrust washer
4. Side gear 5. Lock pin 6. Pinion mate thrust washer
7. Pinion mate gear 8. Pinion mate shaft 9. Drive pinion
10. Drive pinion height adjusting washer 11. Drive pinion rear bearing 12. Collapsible spacer
13. Breather tube 14. Differential side flange 15. Dust shield
16. Circular clip 17. Side oil seal 18. Drive pinion front bearing
19. Front oil seal 20. Companion flange 21. Drive pinion nut
22. Drain plug 23. Differential side shaft 24. Axle shaft bearing
25. Extension tube 26. O-ring 27. Gear carrier
28. Plate 29. Differential case 30. Drive gear
31. Side bearing cap 32. Filler plug 33. Rear cover
SDIA3207E

FRONT FINAL DRIVE ASSEMBLY
FFD-15
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FFD
Revision: August 20072004 QX56
ASSEMBLY INSPECTION AND ADJUSTMENT

Before inspection and adjustment, drain gear oil.
Total Preload Torque
1. Rotate drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.
2. Rotate drive pinion at least 20 times to check for smooth operation of the bearing.
3. Measure total preload with preload gauge.

If measured value is out of the specification, disassemble it to
check and adjust each part. Adjust the pinion bearing preload
and side bearing preload.
Adjust the pinion bearing preload first, then adjust the side bear-
ing preload.
Tooth Contact
1. Remove rear cover. Refer to FFD-11, "REMOVAL" .
2. Thoroughly clean drive gear and drive pinion teeth.
3. Lightly apply a mixture of powdered ferric oxide and oil or the
equivalent. Apply it to 3 or 4 teeth of drive gear drive side.
4. Rotate drive gear back and forth several times, check drive pin-
ion gear to drive gear tooth contact.
CAUTION:
Check tooth contact on drive side and reverse side.
34. Bushing 35. Bearing 36 Screw
37 Dowel pin
Tool number : ST3127S000 (J-25765-A)
Total preload (with oil seal):
2.98 - 4.76 N·m (0.31 - 0.48 kg-m, 27 - 42 in-lb)
SDIA2220E
When the preload torque is large
On pinion bearings: Replace the collapsible spacer.
On side bearings: Loosen the side bearing adjust nuts at the same force on each side.
When the preload is small
On pinion bearings: Tighten the drive pinion nut.
On side bearings: Tighten the side bearing adjust nuts at the same force on each side.
SDIA2248E
SDIA2249E

FFD-16
FRONT FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
Backlash
1. Remove carrier cover. Refer to FFD-11, "REMOVAL" .
2. Fit a dial indicator to the drive gear face to measure the back-
lash.

If the backlash is outside of the specified value, use each side
bearing adjust nut.
Companion Flange Runout
1. Fit a dial indicator onto the companion flange face (inner side of
the propeller shaft mounting bolt holes).
2. Rotate companion flange to check for runout.
3. Fit a test indicator to the inner side of companion flange (socket
diameter).
4. Rotate companion flange to check for runout.
SDIA1796E
Backlash: 0.12 - 0.20 mm (0.0050 - 0.0079 in)
SDIA3203E
When the backlash is large:
Loosen adjust nut A and tighten adjust nut B.
When the backlash is small:
Loosen adjust nut B and tighten adjust nut A.
SDIA2262E
Runout limit: 0.10 mm (0.0039 in)
Runout limit: 0.13 mm (0.0051 in)
PDIA0646E

FRONT FINAL DRIVE ASSEMBLY
FFD-17
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FFD
Revision: August 20072004 QX56
5. If the runout value is outside the runout limit, follow the procedure below to adjust.
a. Check for runout while changing the phase between companion flange and drive pinion by 90° step, and
search for the position where the runout is the minimum.
b. If the runout value is still outside of the limit after the phase has been changed, possible cause will be an
assembly malfunction of drive pinion and pinion bearing and malfunction of pinion bearing. Check for
these items and repair if necessary.
c. If the runout value is still outside of the limit after the check and repair, replace companion flange.
DISASSEMBLY
Differential Assembly
1. Drain gear oil, if necessary.
2. Remove differential side shaft with a soft hammer.
3. Remove differential side flange with a soft hammer.
4. Remove extension tube and O-ring.
5. Place a small hole in seal case, using a suitable punch or drill.
SDIA2223E
SDIA2224E
SDIA3205E
LDIA0129E

FFD-18
FRONT FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
6. Install slide hammer tool as shown and remove seal.
7. Remove rear cover from gear carrier.
8. For proper reinstallation, paint matching mark on one side bear-
ing cap.
CAUTION:

For matching mark, use paint. Do not damage bearing
caps and gear carrier.

Bearing caps are line-board during manufacture. The
matching marks are used to reinstall them in their origi-
nal positions.
9. Remove side bearing caps.
10. Remove side bearing adjust nuts.
LDIA0130E
LDIA0128E
SDIA2228E
SDIA2229E
SDIA2230E

FRONT FINAL DRIVE ASSEMBLY
FFD-19
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FFD
Revision: August 20072004 QX56
11. Keep the side bearing outer races together with inner race. Do
not mix them up.
12. Remove side bearing inner race.
To prevent damage to bearing, engage puller jaws in groove.
CAUTION:

To prevent damage to the side bearing and drive gear,
place copper plates between these parts and vise.

It is not necessary to remove side bearing except it is
replaced.

Be careful not to confuse left-hand and right-hand parts.
Keep bearing and bearing race for each side together.
13. Loosen drive gear bolts in a crisscross fashion.
14. Tap drive gear off the differential case with a soft hammer.

Tap evenly all around to keep the drive gear from bending.
15. Drive out pinion mate shaft lock pin with suitable punch from
drive gear side.
SPD5 27
Tool number A: ST33081000 ( — )
B: ST30021000 ( — )
SDIA2237E
SPD0 22
SDIA2238E
SPD0 25