wheel MITSUBISHI 3000GT 1991 Workshop Manual

27-1
REAR AXLE
CONTENTSM27AA- -~
REAR AXLE . . . . . . . . . . . . . . . . . . . . . .._._..
AXLE SHAFT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
DIFFERENTIAL CARRIER. . . . . . . . . . . . . . . . . . . . . . . .._..........24
DRIVE SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
LSD CASE ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .._.......39
SERVICE ADJUSTMENT PROCEDURES
. . . . . . . .13
Gear OilLevelCheck. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Limited-Slip Differential Check
. . . . . . . . . . .._...........14Rear Axle Total Backlash Check
. . . . . . . . . . . . . . . . . . . .13Rear Wheel Bearing End Play Check
_........... 13
Rear Wheel Bearing Rotation Torque
Check. . . . . . . . . . . . . . . . .._.............................................14
SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
SPECIFICATIONS................................................6General Specifications
....................................6Lubricants
............................................................7Sealants and Adhesives
....................................7Service Specifications
....................................7
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Axle Shaft
Grease leakage
Noise while wheels are rotatingDifferential (Limited Slip Differential)
Abnormal noise during driving or
gear changing
Abnormal noise when cornering
Break down
Gear noise
Gear oil leakage
SeizureThe limited slip differential does
not function
Drive Shaft
Noise
REAR AXLE . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REAR AXLEHUB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE ADJUSTMENT PROCEDURES........Rear Hub Rotary-sliding Resistance
(Torque)Inspection............................................Wheel Bearing End Play Inspection
................
SPECIFICATIONS................................................General Specifications
....................................Service Specifications
....................................
TROUBLESHOOTING. . . . . . . . . . .._....._.....................Abnormal Sound
24
3
3
32
2
2
2

27-2REAR AXLE - Specifications / Troubleshooting
REAR AXLE
SPECIFICATIONS
GENERAL SPECIFICATIONSM27CA.A
Items
Wheel bearing
Tvoe
Specifications
Unit ball bearina
SERVICE SPECIFICATIONS
Items
Limit
Wheel bearing end playmm (in.)
Rear hub rotary-sliding resistance
N (Ibs.)
Rear hub rotary-sliding torqueNm (ft.lbs.)
Specifications
0.05 l.002) or less
31 (7) or less
1.8 (1.30) or lessTROUBLESHOOTING
SymptomProbable causeRemedy
Abnormal sound
Loose wheel nuts
Damaged or worn wheel bearingsBent or distorted brake discsTighten
Replace‘d
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REAR AXLE - Service Adiustment Procedures27-3
llN00261 SERVICE ADJUSTMENT
PRbCEDURES
WHEEL BEARING END PLAY INSPECTIONM27FBAG
1.Inspect the play of the bearings while the vehicle is jacked
up and resting on floor jack.
2. Remove the hub cap and then release the parking brake.
3. Remove the caliper assembly and the brake disc.
4. Check the bearing’s end play.
Place a dial gauge against the hub surface; then move the
hub in the axial direction and check whether or not there is
end play.
Limit: 0.05 mm
(.002 in.) or less
NOTEIf the limit value is exceeded, the lock nut should be
tightened to the specified torque and check the end play
again.5. Replace the rear hub bearing unit if an adjustment cannot
be made to within the limit.
REAR HUB ROTARY-SLIDING RESISTANCE (TOR-
QUE) INSPECTION
M27FFAD
1.Inspect the play of the bearings while the vehicle is jacked
up and resting on floor jack.
2. Release the parking brake.
3. Remove the caliper assembly and the brake disc.
4.
5.After turning the
huba few times to seat the bearing, attach
a spring balance to the hub bolt, and, pulling at a 90” angle
from the hub bolt, measure to determine whether or not
the rotary-sliding resistance of the rear hub (the rotary-
sliding torque of the rear hub) is the standard value.
Limit:
Rear hub rotary-sliding resistance
31 N (7 Ibs.) or lessRear hub rotary-sliding torque
1.8 Nm (1.30 ft.lbs.) or less
NOTEIf the limit value is exceeded, loosen the nut and then
tighten it to the specified torque, and check the rear hub
rotary-sliding torque again.
Replace the rear hub unit bearing if an adjustment cannot
be made to within the limit.
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27-4
REAR AXLE - Rear Axle Hub
REAR AXLE HUB
REMOVAL AND INSTALLATION
M27MA- -
50-60Nm36 - 43 ftlbs.
200-260Nm145-188ftibs.Removal steps
4*4*1. Rear speed sensor 2. Calioer assemblv3.Brakedisc4. Hubcap
l *5. Wheel bearing nut4’6. Tongued washer7. Rear hub assembly4*8. Rear rotor 9. Rear hub unit bearing
Caution
Rear hub unit bearing cannot be disassembled.
llN0018
Pole p&e14NOlO-7
SERVICE POINTS OF REMOVALM27MBAC
1.REMOVAL OF REAR SPEED SENSOR
Caution
Be careful when handling the pole piece at the tip of thespeed sensor and the toothed edge of the rotor so as
not to damage them by striking against other parts.
2. REMOVAL OF CALIPER ASSEMBLY
Remove the caliper assembly and suspend it with a piece of
wire.
8. REMOVAL OF REAR ROTOR
CautionCare must be taken not to scratch or scar the rotor’s
toothed surface, and not to drop it.
If the rotor’s toothed surface is chipped or the rotor is
deformed, it might not be able to accurately sense the
wheel rotation speed and the system as a result mightnot perform normally.
14NOO99ITSB Revision

REAR AXLE ~.. .-_-- -_ ----- Rear Axle Hub27-5
SERVICE POINT OF INSTALLATIONtu27MDAG5. INSTALLATION OF WHEEL BEARING NUT
After tightening the wheel bearing nut, align with the
spindle’s indentation and crimp.
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REAR AXLE - Specifications
SERVICE SPECIFICATIONS27-7M27CEB
L
ItemsSpecifications
Standard value
Rear wheel bearing rotation torqueN
(Ibs.) [Nm (in.lbs.)l12 (2.6) lo.7 (6)] or less
Setting of T.J. boot length
mm (in.)
85 +_ 3 (3.35 f .12)
Final drive gear backlash
mm (in.)0.11 -0.16(.004-.006)
Differential gear backlash (Limited slip differential)
mm (in.)0.03 - 0.09 (.0012 -.0035)
Drive pinion rotation torque
Nm
(in.lbs.)
With oil seal
New part (with rust-prevention oil)0.5 - 0.7 (4 - 6)
New part/reusable part (gear oil application)
0.35
- 0.45 (3 - 4)
Without oil seal
New part (with rust-prevention oil)
0.3-0.5(3-4)
New part/reusable part (gear oil application)0.15 - 0.25 (1 - 2)
Limit
Rear axle total backlashmm (in.)5 (2)
Drive gear runout
mm (in.)0.05 (.002)
Rear wheel bearing end playmm (in.)0.8 (031)
LUBRICANTSM27CD.~Items
Specified lubricantsQuantity
i
Rear axle gear oilHypoid Gear Oil API classification GL-5 or higher1 .I lit. (1.2 qts.)
Above -23°C (-10°F) SAESO, 85W-90,8OW-90From -34°C (-30°F) to -23°C (-10°F) SAE 8OW, 8OW-90
Below -34°C (-30°F) SAE 75W
B.J. boot grease
T.J. boot greaseRepair kit grease125 g (4.41 oz.)
135 g (4.76 oz.)
SEALANTS AND ADHESIVESM27CE-.
I7.Specrfred sealants and adhesives
Drive gear threaded hole
Vent plug
Differential cover3M Stud Locking Part No. 4170 or equivalent
3M ATD Part No. 8663 or equivalentTSB Revision

li
LREAR AXLE
- Troubleshootinn
TROUBLESHOOTINGM27EAAH
SymptomProbable cause
Remedy
4XLE SHAFT
Noise while wheelsBrake drag
Replace
are rotatingBent axle shaftWorn or scarred axle shaft bearing
Grease leakageWorn or damaged oil seal
Malfunction of bearing sealReplace
DRIVE SHAFTNoiseWear, play or seizure of ball jointExcessive drive shaft spline loosenessReplace
DIFFERENTIAL
(LIMITED SLIP
DIFFERENTIAL)Abnormal noise
during driving
or gear changing
NOTE
Excessive final drive gear backlashInsufficient drive pinion preload
Excessive differential gear backlash
Worn
spline of a side gear
Loose companion flange self-locking nut
Adjust
Adjust or replace
Replace
Retighten or replace
In addition to a malfunction of the differential carrier components, abnormal noise can also be caused by the
universal joint of the propeller shaft, the axle shafts, the wheel bearings, etc. Before disassembling any parts, takeall possibilities into consideration and confirm the source of the noise.
Abnormal noisewhen cornering
Gear noiseDamaged differential gears
Damaged pinion shaft
Insufficient gear oil quantity
Improper final drive gear tooth contact
adjustment
Replace
Replenish
Adjust or replace
Incorrect final drive gear backlash
Improper drive pinion preload adjustmentAdjust
Damaged, broken, and/or seized tooth surfacesof the drive gear and drive pinionDamaged, broken, and/or seized drive pinion
bearingsReplace
Damaged, broken, and/or seized side bearings
Damaged differential case
inferior gear oil
NOTE
Insufficient gear oil quantityReplenishNoise from the engine, muffler vibration, transaxle, propeller shaft, wheel bearings, tires, body, etc., is easily
mistaken as
being caused by malfunctions in the differential carrier components. Be extremely careful and
attentive when performing the driving test, etc.
Test methods to confirm the source of the abnormal noise include: coasting, acceleration, constant speed driving.
raising the rear wheels
on a jack, etc. Use the method most appropriate to the crrcumstances.TSB Revision

REAR AXLE - Service Adjustment Procedures2743
,,rmr
SERVICE ADJUSTMENT PROCEDURES
REAR AXLE TOTAL BACKLASH CHECKM27FAAG
If the vehicle vibrates and produces a booming sound due to an
imbalance of the driving system, measure the rear axle total
backlash by the following procedures to see if the differential
carrier assembly required removal.
(1) Place the gearshift lever in the neutral position, apply the
parking brake and jack up the vehicle.
(2) Manually turn the propeller shaft clockwise as far as it will
go and make mating marks on the companion flange dustshield and the differential carrier.
(3) Manually turn the propeller shaft counterclockwise as far as
it will go and measure the movement of the mating marks.Limit: 5 mm
(.2 in.)
(4) If the backlash exceeds the limit, remove the differential
carrier assembly and adjust the backlash. (Refer to P.27-26.)
GEAR OIL LEVEL CHECKM27FCAG1. Remove the filler plug, and check the oil level.
2. The oil level is sufficient if it reaches the filler plug hole.
Specified
gear oil:
Hypoid Gear Oil API classification GL-5 or higher
[l.l liter (1.2 q&J]
NOTEAbove -23°C (-10°F): SAE 90,
85W-90, 8OW-90From -34°C (-30°F) to -23°C (-10°F): SAE
8OW, 8OW-90Below -34°C (-30°F): SAE 75W
REAR WHEEL BEARING END PLAY CHECKM27FBAF1. Support the vehicle on axle stands positioned at the
specified locations and remove the rear wheel.
2. Separate the parking brake cable from the rear brake.
3. Remove the caliper assembly and brake disc.
4. Place a dial gauge as shown in the illustration, and then
measure the play when the axle shaft is moved in the axial
direction.Limit: 0.8 mm
(.031 in.)
5.If the play exceeds the limit, check the tightening torque ofthe companion flange of the axle shaft; if it is correct,
replace the wheel bearing.
1 TSB RevisionI

27-14REAR AXLE - Service Adjustment Procedures~
Incorrect
llA033CREAR WHEEL BEARING ROTATION TORQUE
I
CHECKM27FJAB1. Remove the drive shaft from the companion flange.
2. Remove the brake pad or caliper assembly.
3. Attach a spring balance to the hub bolt, then, pulling the
‘d ’balance at a right angle to the hub bolt, measure the
rotation torque (rotation starting torque) to see whether it iswithin the standard value.
Standard value: 12 N (2.6 Ibs.) [rotation starting torque0.7 Nm (6
in.lbs.)] or less
4. If the rotation starting torque exceeds the standard value,
check the tightening torque of the axle shaft companion
flange. If it is normal, replace the bearing.
LIMITED-SLIP DIFFERENTIAL CHECKM27FlAB
1.Block the front wheels and move the shift lever to neutral.2. Completely release the parking brake.
3. Jack up the rear wheels and place a rigid rack at the
specified part of the side sill.
4. Disconnect the coupling of the differential and propeller
shaft.LJ5. When one wheel is slowly rotated, check whether or not
the wheel on the other side turns in the same direction.
6.If it turns in the opposite direction, replace the viscous unit.
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27-16
REAR AXLE - Axle Shaft
MB990241-01
MB990,938-01AY ho"sing
MB990$28-0111 A003865. REMOVAL OF SELF-LOCKING NUT
With the special tool, secure the axle shaft and remove the
companion flange self-locking nut.8. REMOVAL OF AXLE SHAFT ASSEMBLY
With the special tool, remove the axle shaft from the axle
housing.
9.REMOVAL OF REAR ROTOR Remove the rear rotor from the axle shaft.
10. REMOVAL OF OUTER BEARING / 1.1. DUST SHIELDRemove the outer bearing and dust shield concurrently
from the axle shaft.
14. REMOVAL OF OIL SEAL
/ 15. INNER BEARING
With the special tool, remove the inner bearing and oil sealfrom the axle housing.
INSPECTIONhl27HcAGl Check the companion flange for wear or damage.
l Check the dust shield for deformation or damage.
l Check the wheel bearings for burning or discoloration.
l Check the wheel bearing for unsmooth rotation.
l Check the axle shaft for cracking, wear or damage.
l Check oil seal for cracking or damage.
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