Infiniti QX56 (Z62). Manual - part 493

DLN-172

< UNIT DISASSEMBLY AND ASSEMBLY >

[FRONT FINAL DRIVE: R180A]

DIFFERENTIAL ASSEMBLY

2.

Fit a dial indicator to the drive gear back face.

3.

Rotate the drive gear to measure runout.

• If the runout is outside of the repair limit, check drive gear

assembly condition; foreign material may be caught between
the drive gear and differential case, or differential case or drive
gear may be deformed.

CAUTION:

Replace drive gear and drive pinion as a set.

TOOTH CONTACT

1.

Remove carrier cover. Refer to 

DLN-168, "Disassembly"

.

2.

Apply red lead to the drive gear.

CAUTION:

Apply red lead to both the faces of 3 to 4 gears at 4 loca-
tions evenly spaced on the drive gear.

3.

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.

Drive gear runout

: Refer to 

DLN-185, "Drive 

Gear Runout"

.

SPD886

SPD357

SDIA0570E

DIFFERENTIAL ASSEMBLY

DLN-173

< UNIT DISASSEMBLY AND ASSEMBLY >

[FRONT FINAL DRIVE: R180A]

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4.

If the tooth contact is improperly adjusted, adjust the drive pinion
height (dimension X).

• If the tooth contact is near the face (face contact), or near the

heel (heel contact), use a thicker drive pinion height adjusting
washer to move drive pinion closer to the drive gear
For selecting adjusting washer, refer to the latest parts infor-
mation.

SDIA2549E

SDIA0517E

PDIA0440E

DLN-174

< UNIT DISASSEMBLY AND ASSEMBLY >

[FRONT FINAL DRIVE: R180A]

DIFFERENTIAL ASSEMBLY

• If the tooth contact is near the flank (flank contact), or near the

toe (toe contact), use a thinner drive pinion height adjusting
washer to move the drive pinion farther from the drive gear.
For selecting adjusting washer, refer to the latest parts infor-
mation.

BACKLASH

1.

Remove carrier cover. Refer to 

DLN-168, "Disassembly"

.

2.

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:

Never change the total amount of washers as it changes the preload torque.

Inspection

INFOID:0000000006222395

INSPECTION AFTER DISASSEMBLY

Drive Gear and Drive Pinion

• Clean up the disassembled parts.
• If the gear teeth never mesh or line-up correctly, determine the cause and adjust or replace as necessary.
• If the gears are worn, cracked, damaged, pitted or chipped (by friction) noticeably, replace with new drive

gear and drive pinion as a set.

Bearing

• Clean up the disassembled parts.
• If any chipped (by friction), pitted, worn, rusted or scratched marks, or unusual noise from the bearing is

observed, replace as a bearing assembly (as a new set).

Side Gear and Pinion Mate Gear

• Clean up the disassembled parts.
• If any cracks or damage on the surface of the tooth is found, replace.
• If any worn or chipped mark on the contact sides of the thrust washer is found, replace.

Side Gear Thrust Washer and Pinion Mate Thrust Washer

• Clean up the disassembled parts.
• If it is chipped (by friction), damaged, or unusually worn, replace.

Oil Seal

PDIA0441E

Backlash

: Refer to 

DLN-185, "Back-

lash"

.

When the backlash is large:

Make drive gear back side adjusting washer thicker, 
and drive tooth side adjusting washer thinner by the 
same amount. For selecting adjusting washer, refer to 
the latest parts information.

If the backlash is less than specification:

Make drive gear back side adjusting washer thinner, 
and drive tooth side adjusting washer thicker by the 
same amount. For selecting adjusting washer, refer to 
the latest parts information.

SPD513

DIFFERENTIAL ASSEMBLY

DLN-175

< UNIT DISASSEMBLY AND ASSEMBLY >

[FRONT FINAL DRIVE: R180A]

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• Whenever disassembled, replace.
• If wear, deterioration of adherence (sealing force lips), or damage is detected on the lips, replace them.

Differential Case

• Clean up the disassembled parts.
• If any wear or crack on the contact sides of the differential case is found, replace.