1991 MITSUBISHI 3000GT Service Manual

REAR AXLE - Drive Shaft27-21Lubrication Points
llA0084
11E560
Grease: Repair kit grease
Quantity to use: 135 g (4.76 oz.)
Caution
Apply all of the grease from the repair kit to the joint and boot, a half to each
as a rule.
Special grease is used for the joint. Do not mix old grease with new or mix
different types.
Grease: Repair kit grease
Quantity to use: 125 g (4.41 oz.)
Caution
_ .Apply all of the grease from the
repair kit to the joint and boot, a halfto each as a rule.
Special grease is used for the joint.
Do not mix old grease with new or
mix different types.llN0022
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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.
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REAR AXLE - Drive Shaft27-23
llK008
1Lever
r,.
:I‘)B.J. boot band: 20 - 74 #BJ95
( T.J. boot band: 20 - 75 #BJ95llKl'=-llE560
HP0124
(3) Fill the inside of the B.J. and B.J. boot with the specified
grease.
Specified grease: Repair kit grease125 g (4.4102.)
Caution
The grease in the repair kit should be divided in halffor use, respectively, at the joint and inside the
boot.A special type of grease is used on the joint. Be
cautious to ensure that not other grease is allowedto come in contact with the joint.
(4) Secure the boot bands.
Caution1. The boot bands should be tightened with the
drive shaft at a 0” joint angle.
2. The B.J. boot band and T.J. boot band are
identified by the identification number stampedon the lever. Install correct ones at correct
positions.5. INSTALLATION OF SPIDER ASSEMBLY
(1) Apply the specified grease furnished in the repair kit to
the spider assembly.Specified grease: Repair kit grease
(2) Install the spider assembly with the chamfered spline
end first.2. 1. INSTALLATION OF T.J. BOOT BANDS
Set the T.J. boot bands at the specified distance in order toadjust the amount of air inside the T.J. boot, and then
tighten the T.J. boot band securely.
Standard value: 85 + 3 mm (3.35 +
.I2 in.)
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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
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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.
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/
i.J
I
i
REAR AXLE - Differential Carrier27-27
CT2flG0076
-7(2) Insert a brass rod between the differential carrier and the
differential case, and then rotate the companion flange byhand (once in the normal direction, and then once in the
reverse direction) while applying a load to the drive gear, so
that the revolution torque [approximately 2.5 - 3.0 Nm (28 -33
in.lbs.)] is applied to the drive pinion.
Caution
If the drive gear is rotated too much, the tooth contactpattern will become unclear and difficult to check.
(3) Check the tooth contact condition of the drive gear and
drive pinion.
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27-28
REAR AXLE - Differential Carrier
Standard tooth contact pattern
1 Narrow tooth side
2 Drive-side tooth surface (the side applying
power during forward movement)
3 Wide tooth side
4 Coast-side tooth surface (the side applying
power during reverse movement)
2
34
ProblemTooth contact pattern resulting from exces-
sive pinion heightSolution
The drive pinion is positioned too far from the center ofthe drive gear.Increase the thickness of the pinion height adjustingshim, and position the drive pinion closer to the centerof the drive gear.
Also, for backlash adjustment, position the drive gearfarther from the drive pinion.
Tooth contact pattern resulting from insuffi-
cient pinion height
ectdb
e52 34&$%$I$&2 3 4
The drive pinion is positioned too close to the center ofthe drive gear.Decrease the thickness of the pinion height adjustingshim, and position the drive pinion farther from the
center of the drive gear.
Also, for backlash adjustment, position the drive gearcloser to the drive pinion.
11 S642
NOTE(I)Tooth contact pattern is a method for judging the result of the adjustment of drive pinion height and final drive gear
backlash. The adjustment of drive pinion height and final drive gear backlash should be repeated until tooth contactpatterns bear a similarity to the standard tooth contact pattern.
(2)When adjustment is not able to obtain a correct pattern, it may be judged that the drive gear and drive pinion haveexceed their usage limits and both gears should be replaced as a set.
,
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