Infiniti M45 (Y34). Manual - part 726

REAR FINAL DRIVE ASSEMBLY

RFD-17

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RFD

DISASSEMBLY OF DIFFERENTIAL CASE ASSEMBLY

1.

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- and right-hand parts. 
Keep bearing and bearing race for each side together.

2.

Loosen drive gear bolts in a crisscross fashion.

3.

Tap drive gear off the differential case with a soft hammer.

●

Tap evenly all around to keep drive gear from binding.

Tool number

: A   ST33051001 (J22888-20)

: B   ST33061000 (J8107-2)

SPD920

SPD022

SPD024

RFD-18

REAR FINAL DRIVE ASSEMBLY

4.

Drive out pinion mate shaft lock pin with punch from drive gear
side.

5.

Remove the pinion mate shaft.

6.

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.

7.

Check mating surfaces of differential case, side gears, pinion
mate gears, pinion mate shaft and thrust washers.

INSPECTION

●

Clean up the disassembled parts. Then, inspect if the parts are wear or damaged. If so, follow the mea-
sures below.

SPD025

SDIA0031J

SDIA0032J

SDIA0187J

Content

Measures

Drive gear and drive pinion

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If the gear teeth do not mesh or line-up correctly, determine the cause and adjust, repair, or 
replace as necessary. 

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if the gear are worn, cracked, damaged, pitted or chipped (by friction) noticeably, replace with a 
new gears.

Bearing

●

If found any chipped (by friction), pitted, worn, rusted, scratched mark, or unusual noise from the 
bearing, replace with a new bearing assembly (as a new set).

REAR FINAL DRIVE ASSEMBLY

RFD-19

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RFD

ADJUSTMENT OF DIFFERENTIAL CASE 
Thrust Washer Selection

1.

Apply gear oil to contact surfaces of each gear, thrust washers
and differential case. 

2.

Install the removed thrust washer or same thickness washer to
side gear.

3.

Install the side gears, thrust washers, pinion mate gears, thrust
washers  into differential case.

CAUTION:

Install the circlip equipped side gear to the side retainer
side.

4.

Fit pinion mate shaft to differential case so that it meets lock pin
holes.

Side gear thrust washer and 
pinion mate thrust washer

●

Replace with a new one if found any cracks or damage on the surface of the tooth.

●

Replace with a new one if found any worn or chipped mark on the contact sides of the thrust 
washer. 

Side gear and pinion mate 
thrust washer

●

Replace with a new one if found that it is chipped (by friction), damaged, or unusual worn. 

Oil seal

●

Oil seals must be replaced with a new one whenever disassembled.

Differential case

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Replace with a new one if found any wear or cracks on the contact sides of the differential case.

Companion flange

●

Replace with a new one if found any chipped marks (about 0.10mm, 0.0039in) or other damage 
on the contact sides of the lips of the companion flange.

Content

Measures

SDIA0193J

SDIA2025E

SDIA0195J

RFD-20

REAR FINAL DRIVE ASSEMBLY

5.

Adjust clearance between rear face of side gear and thrust
washer by selecting side gear thrust washer. Refer to 

RFD-32,

"AVAILABLE PINION HEIGHT ADJUSTING WASHERS"

 .

Use two feeler gauges to prevent leaning of side gear as show-
ing figure.

SIDE BEARING PRELOAD

A selection of carrier side bearing adjusting washers is required for successful completion of this procedure.
1.

Make sure all parts are clean. Also, make sure the bearings are
well lubricated with gear oil.

2.

Place the differential case assembly, with side bearing outer
races installed, into the gear carrier.

3.

Insert left and right side bearing adjusting washers in place
between side bearings and gear carrier.

4.

Install the bearing caps in their correct locations and torque the
bearing cap retaining bolts. Refer to 

RFD-12, "Components"

 .

5.

Turn the carrier several times to seat the bearings.

Clearance between side gear thrust washer and dif-
ferential case

: 0.20 mm (0.0079 in) or less

SPD828

SPD527

SPD924

SDIA1795E