service MITSUBISHI 3000GT 1991 Service Manual

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.
1 TSB Revision

I’REAR AXLE
- Axle Shaft
AXLE SHAFT
REMOVAL AND INSTALLATION27-15M27HA- -
i
/
i55-65 Nm
QO - 47 ftlbs.
Iq y 6
50-60Nm
36-4?R.‘bs-
12 Nm9 ft.lbs.
/
190 Nm137 ft.lbs.
260 - 300 Nm188-217ftlbs.
Removal steps
l *1. Rear speed sensora*2. Brake caliper assembly
3. Brake disc
4. Drive shaft mounting nut
+I) l *5. Self-locking nut
6. Washer
7. Companion flange
l *8. Axle shaft assembly+* l +9. Rear rotor

+* l + 10. Outer bearinga* l a 11. Dust shieldl a 12. Dust shield13. Axle shaftl * ** 14. Oil seall * I)+ 15. Inner bearing
/llN0021
llA0325 IllA026~
SERVICE POINTS OF REMOVALM27HBAQ
1.REMOVAL OF REAR SPEED SENSOR
Caution
Be cautious to ensure that the tip of the pole piece doesnot come in contact with other parts when removing
the speed sensor.2. REMOVAL OF BRAKE CALIPER ASSEMBLY
Remove the brake caliper assembly and suspend it with apiece of wire.
1 TSB Revision

REAR AXLE - Axle Shaft27-17
I-
Axle housing
MB990938-01
3fe
tiB990931-01
llA0039
MB990641
llN0015
r
- llAQ034llN000711 A0033
llN0008
SERVICE POINTS OF INSTALLATIONM27HOAS
15. INSTALLATION OF INNER BEARINGWith the special tool, press fit the inner bearing onto the
axle housing.
14. INSTALLATION OF OIL SEAL(1) With the special tool, press the oil seal onto the axle
housing with the depression in the oil seal facing
upward, and until it contacts the shoulder on the insideof the axle housing.
NOTE
When tapping the oil seal in, use a plastic hammer to
lightly tap the top and circumference of the special tool,
press fitting gradually and evenly.(2) Apply multipurpose grease to the oil seal lip.
12.
INSTALLATlOkl OF DUST SHIELD
Orienting the dust shield as shown in the illustration, andusing the special tool, press fit the dust shield until it
contacts the axle shaft shoulder.
NOTE
When tapping the oil seal in, use a plastic hammer to lightlytap the top and circumference of the special tool, press
fitting gradually and evenly.
I I. INSTALLATION OF DUST SHIELDWith the special tool, install the dust shield so that the
depression is facing upward.
NOTE
When tapping the oil seal in, use a plastic hammer to lightlytap the top and circumference of the special tool, press
fitting gradually and evenly.
IO. INSTALLATION OF OUTER BEARING
(1) Apply multipurpose grease around the entire circumfer-ence of the inner side of the outer bearing seal lip.
(2) Press fit the outer bearing to the axle shaft so that the
bearing seal lip surface is facing towards the axle shaft
flange.
1 TSB Revision

27-18REAR AXLE - Axle Shaft / Drive Shaft
57-9. INSTALLATION OF REAR ROTOR
Press fit the rear rotor to the axle shaft with the rear rotorgroove surface toward the axle shaft flange.
5. INSTALLATION OF SELF-LOCKING NUT
With the special tool, secure the axle shaft and tighten thecompanion flange self-locking nut.
DRIVE SHAFT
REMOVAL AND INSTALLATIONM27JA-
-55-65 Nm
Removal steps4I)
l 4 2. Driveshaft3.
Circlipl *4. Oil sealllNO020
SERVICE POINT OF REMOVAL2. REMOVAL OF DRIVE SHAFT
Using a tire lever, etc. remove the
differential carrier.TSB Revision
drive shaftfrom the
M27JBAE

REAR AXLE - Drive Shaft27-19
i
INSPECTIONM27JHAB
lCheck the drive shaft boots for damage or deterioration.l
Check the ball joints for excessive play or check operation.l Check the drive shaft spline for wear or damage.
MB991380llFOO1;
Two-part serration
llAO280
SERVICE POINTS OF INSTALLATIONM27JCAG4. INSTALLATION OF OIL SEAL
(1) If the oil seal is to be replaced because of damage, driveit in by using the special tool.
(2) Apply the specified grease to the oil seal lip.
2. INSTALLATION OF DRIVE SHAFT
CautionI.
Be cautious to ensure that the differential carrier oilseal is not damaged by the drive shaft spline.
2. The right drive shaft for models equipped with the
LSD having a VCU has a two-part serration. Be verycareful to install each one on the correct side.
NOTE
The left and right drive shafts can also be distinguished
from each other by the identification color of boot band
(B.J. side).Drive shaft
LHRH
Boot band (B.J. side)identification colorIWhite
Blue
I
CautionBe sure to thoroughly remove any oil or grease, etc.
from the threaded part of the bolt and nut used for
installation to the companion flange, because any oil,
grease, etc. on these parts might cause later looseningeven though tightening is at the specified torque.
1 TSB Revision1

27-22REAR AXLE - ‘Drive Shaft
SERVICE POINTS OF DISASSEMBLYM27JEADI4. REMOVAL OF SNAP RING
/ 5. SPIDER ASSEMBLY
(1) Remove the snap ring from the drive shaft with the d i
snap ring pliers.
(2) Take out the spider assembly from the drive shaft.
(3) Clean the spider assembly.
Caution1. Do not disassemble the spider assembly.
2..If the T.J. of the drive shaft assembly is bent, the
joint may be damaged. Use care in handling the
drive shaft.3. The drive shaft joint use special grease. Do not
add another type of grease.
6. REMOVAL OF T.J. BOOT
/ 9. B.J. BOOT
(I) Wrap vinyl tape around the spline part on the T.J. side ofthe drive shaft so that the T.J. and B.J. boots are not
damaged when they are removed.
(2) Withdraw the T.J. and B.J. boots from the drive shaft.
10. REMOVAL OF GREASE FROM B.J.
Wipe out the grease from the B.J.
CautionDo not disassemble the B.J.h
llKOO7
INSPECTIONM27JFADl Check the drive shaft for damage, bending or corrosion.
l Check the drive shaft spline part for wear or damage.
lCheck for entry of water and/or foreign material into B.J.l Check the spider assembly for roller rotation, wear or
corrosion.
lCheck the groove inside T.J. case for wear or corrosion.l Check the boots for deterioration, damage or cracking.
SERVICE POINTS OF REASSEMBLYM27JGAE9. INSTALLATION OF B.J. BOOT
/ 8. B.J. BOOT BAND
(SMALL) / 7. B.J. BOOT BAND (LARGE) / 6. T.J. BOOT
(1) Wrap vinyl tape around the drive shaft spline.
(2) Insert the drive shaft in B.J. boot, boot bands, T.J. bootin that sequence.
TSB Revision

27-24REAR AXLE - Differential Carrier
DIFFERENTIAL CARRIER
REMOVAL AND INSTALLATION
M271A. -
Pre-removal and Post-installation Operationl Draining and Filling of Differential Gear Oil
(Refer to Group 00 - Maintenance Service.)l Removal and Installation of Main Muffler
(Refer to Group 15 - Exhaust Pipe and Muffler.)24Nm
17 ft.lbs.
90 Nm65 ft.lbs.4
/lIl8
c/
90 Nm65 ft.lbs.
63
i
i !f%
43 - 51ft.lbs.
90 Nm65 ftlbs.
,55-65Nm40 - 47 fklbs.
22 - 25 ft.lbs.
90 Nm65 ft.lbs.llFO034
Removal steps
a*1. Drive shaft
2. Circlipl * l a3. Propeller shaft connection
4. Differential support assembly
5. Differential support member assembly
6. Rear wheel oil pump installation bolt
l * l *7. Differential carrier
8. O-ring
1 TSB Revision

REAR AXLE - Differential Carrier
27-25
Mating marks
//
MB991 153
MBggo8477J=f 4
Differential support member
llNOOl1
DifferentialllN0053
SERVICE POINTS OF REMOVALm27wAm
1. REMOVAL OF DRIVE SHAFT
With a tire lever, etc., remove the drive shaft from the
differential carrier.
NOTE
Be cautious to ensure that the differential carrier oil seal isnot damaged by the drive shaft spline.
3. DISCONNECTION OF PROPELLER SHAFT
(1) Make mating marks on the differential companion
flange and the propeller shaft flange yoke for reference
during reassembly.
(2) Remove the differential carrier and propeller shaft
connection.
(3) Support the propeller shaft with wire.
7. REMOVAL OF DIFFERENTIAL CARRIER
Holding the bottom of the differential carrier and removing
the rear wheel oil pump through the mounting hole, removethe differential carrier.
Caution1. Use care not to damage the rear wheel oil pump
gears.
2.Use care not to allow dirt or foreign matter to fall
into the differential carrier.
DIFFERENTIAL SUPPORT BUSHING AND DIF-
FERENTIAL SUPPORT MEMBER BUSHING RE-
PLACEMENTM271YAB
Install or remove the bushing using the special tool. Install the
bushing with its hollow portion facing in the direction shown.
CautionInstall the bushing with the differential support and
differential support member chamfered end first and
install until the bushing outer case end face is flush withthe support and support member.

27-26
REAR AXLE - Differential Carrier
SERVICE POINTS OF INSTALLATION
7. INSTALLATION OF DIFFERENTIAL CARRIERm27lDAL
Install the rear wheel oil pump by inserting it through the
mounting hole and install the differential carrier securely.\yiIlYl61
Caution
Use care not to damage the rear wheel oil pump gears.
3. CONNECTION OF PROPELLER SHAFTAlign the mating marks on the flange yoke and the
companion flange to install the propeller shaft.
INSPECTION BEFORE DISASSEMBLYM27lEAJHold the working base in a vice, and attach the differential
carrier to the working base.
FINAL DRIVE GEAR BACKLASH
With the drive pinion locked in place, measure the final drivegear backlash with a dial indicator on the drive gear.
NOTEMeasure at four points or more on the circumference of the
drive gear.d’Standard value: 0.11
- 0.16 mm (.004 - .006 in.)IDRIVE GEAR
RUNOUTI
Measure the drive gear runout at the shoulder on the reverseside of the drive gear.
Limit: 0.05 mm
(.002 in.)
FINAL DRIVE GEAR TOOTH CONTACT
Check the final drive gear tooth contact by following the steps
below.
(1) Apply a thin, uniform coat of machine blue to both surfaces ’of the drive gear teeth.
TSB Revision