2006 INFINITI QX56 Factory Service Manual

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Page 2041 of 3383

INFINITI QX56 2006 Factory Service Manual FFD-18
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
DISASSEMBLY
Differential Assembly
1. Drain the differential gear oil if necessary.
2. Remove the differential side shaft and differen

Page 2042 of 3383

INFINITI QX56 2006 Factory Service Manual FRONT FINAL DRIVE ASSEMBLYFFD-19
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Revision: November 2009 2006 QX56
6. Remove the carrier cover bolts and separate the carrier cover
from the gear carrier using Tool.
CAUTION

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INFINITI QX56 2006 Factory Service Manual FFD-20
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
11. Remove side bearing inner race using Tools as shown.
CAUTION:
Do not remove side bearing inner race unless it is being
replaced.

Page 2044 of 3383

INFINITI QX56 2006 Factory Service Manual FRONT FINAL DRIVE ASSEMBLYFFD-21
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Revision: November 2009 2006 QX56
17. Turn the pinion mate gear, then remove the pinion mate gear,
pinion mate thrust washer, side gear and

Page 2045 of 3383

INFINITI QX56 2006 Factory Service Manual FFD-22
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
6. Remove the drive pinion rear bearing inner race and drive pinion
height adjusting washer using Tool.
7. Place a small hole in the

Page 2046 of 3383

INFINITI QX56 2006 Factory Service Manual FRONT FINAL DRIVE ASSEMBLYFFD-23
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INSPECTION AFTER DISASSEMBLY
Clean the disassembled parts. Then inspect the parts for wear or damage. If w

FRONT FINAL DRIVE ASSEMBLYFFD-23
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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.
ADJUSTING AND SELECTING WASHERS
Side Gear Back Clearance
Assemble the differential parts if they are disassembled. Refer to FFD-27, "Differential Assembly" .
1. Place the differential case straight up so that the side gear to be measured is upward.
PDIA0460E

Page 2047 of 3383

INFINITI QX56 2006 Factory Service Manual FFD-24
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
2. Using feeler gauges, measure the clearance between the side
gear back and differential case at three different points, while
rotat

FFD-24
FRONT FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
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 FFD-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.
Drive Pinion Height
Drive gear and drive pinion are supplied in matched sets only.
Matching numbers on both drive pinion and drive gear are
etched for verification. If a new gear set is being used, verify the
numbers of each drive pinion and drive gear before proceeding
with assembly.
The mounting distance from the centerline of the drive gear to the back face of the drive pinion for the
M205 final drive assembly is 103.5 mm (4.0748 inches).
On the button end of each drive pinion, there is etched a plus (+) number, a minus (-) number, or a zero
(0), which indicates the best running position for each particular gear set. This dimension is controlled by
a selective drive pinion height adjusting washer between the drive pinion rear bearing inner race and drive
pinion.
For example: If a drive pinion is etched m+8 (+3), it would require 0.08 mm (0.003 inch) less drive pinion
height adjusting washer than a drive pinion etched “0”. This means decreasing drive pinion height adjust-
ing washer thickness; increases the mounting distance of the drive pinion to 103.6 mm (4.0778 inches). If
a drive pinion is etched m-8 (-3), it would require adding 0.08mm (0.003 inch) more to the drive pinion
height adjusting washer than would be required if the drive pinion were etched “0”. By adding 0.08 mm
(0.003 inch), the mounting distance of the drive pinion was decreased to 103.4 mm (4.0718 inches) which
is just what a m-8 (-3) etching indicated.
To change the drive pinion height, use different drive pinion height adjusting washers which come in differ-
ent thickness.
Use the following tables as a guide for selecting the correct drive pinion height adjusting washer thickness
to add or subtract from the old drive pinion height adjusting washer. 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
SDIA2241E

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INFINITI QX56 2006 Factory Service Manual FRONT FINAL DRIVE ASSEMBLYFFD-25
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Revision: November 2009 2006 QX56
ASSEMBLY
Drive Pinion Assembly
1. Install drive pinion rear bearing outer race using Tools.
2. Install dri

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