1991 MITSUBISHI 3000GT check oil

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

27-26
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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REAR AXLE - Differential Carrier27-31
Mating marks
MB990339-01
llY175J
1
15. REMOVAL OF DRIVE PINION ASSEMBLY(1) Make the mating marks to the drive pinion and
companion flange.
NOTEMating marks should not be made to the contact
surfaces of companion flange and propeller shaft.
(2) Drive out the drive pinion together with the drive pinionspacer and drive pinion front shims.
19. REMOVAL OF DRIVE PINION REAR BEARING INNER
RACE
Pull out the drive pinion rear bearing inner race by using the
special tools.22. REMOVAL OF OIL SEAL
/ 23. DRIVE PINION FRONT
BEARINGDrive out the drive pinion front bearing from the gear
carrier.
24. REMOVAL OF DRIVE PINION REAR BEARING OUTER
RACE
Drive out the drive pinion rear bearing outer race from the
gear carrier.
INSPECTIONM27lHBBl Check the companion flange for wear or damage.
l Check the oil seal for wear or deterioration.
l Check the bearings for wear or discoloration.
l Check the gear carrier for cracks.
l
Check the drive pinion and drive gear for wear or cracks.l
Check the side gears, pinion gears and pinion shaft for wear
or damage.l Check the side gear spline for wear or damage.
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27-34
REAR AXLE - Differential Carrier
YYW!-01
I1 11AOlOl
MB99Y2232. PRESS-IN OF THE DRIVE GEAR (FOR 4WS)
(1) With the beveled (large) part of the rear wheel oil pump
drive gear at the inner side, press in the drive gear (by
using the special tool) until the drive gear contacts theend surface of the
.differential case.
(2) Check to ensure that the drive gear and the spring pin
are flush.4. INSTALLATION OF DRIVE PINION REAR BEARING
OUTER RACE
/ 5. DRIVE PINION FRONT BEARING
OUTER RACE
Press-fit the drive pinion rear and front bearing outer racesinto the gear carrier by using the special tools.
CautionBe careful not to press in the outer race at an angle.
. DRIVE PINION HEIGHT ADJUSTMENT
Adjust the drive pinion height by the following procedures:
(1) Install special tools and drive pinion front and rear
bearing inner races on the gear carrier in the sequenceshown in the illustration.
NOTE
Apply a thin coat of multipurpose grease to the matingface of the washer of the special tool.
(2) Tighten the handle of the special tool until the standardvalue of drive pinion rotation torque is obtained.
(3) Measure the drive pinion rotation torque (without the oil
seal).
Standard value
Bearing
classificationBearing
lubricationRotation torqueNm (in.lbs.1
INew
None (with0.3 - 0.5rust-prevention oil)(3 - 4)I
New/reused
NOTEGear oil
application0.15 - 0.25
(1 - 2)
(1) Gradually tighten the nut of the special tool while checkingthe drive pinion rotation torque.
(2) Because the special tool cannot be turned one turn, turn it
several times within the range that it can be turned; then,after fitting to the bearing, measure the rotation torque.
L/1 1
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27-36REAR AXLE - Differential Carrier
:$.:::..::..&‘p
.!I Ia
.:...:.:::.:B. . ..i
\Grease
J
11 D55411223(5) Remove the companion flange and drive pinion once
again.
Drive the oil seal into the qear carrier front lip by using_
the special tool.Apply multipurpose grease to the oil seal lip.
(6) Apply a thin coat of multipurpose grease to the
companion flange contacting surface of the washer
before installing drive pinion assembly.
(7) Install the drive pinion assembly and companion flangewith mating marks properly aligned, and tighten the
companion flange self-locking nut to the specified
torque by using the special tools.
(8) Measure the drive pinion rotation torque (with oil seal)
to verify that the drive pinion rotation torque complies
with the standard value.
Standard value
Bearing
classificationBearrng
lubricationRotation torqueNm (in.lbs.)
Nt?WNone (with
0.5 - 0.7rust-prevention oil)(4 - 6)New/reused
Gear oil0.35 - 0.45
application
(3 - 4)If there is a deviation from the standard value, check
whether or not there is incorrect tightening torque of
the companion flange tightening self-locking nut, or
incorrect fitting of the oil seal.
18. INSTALLATION OF DRIVE GEAR
(I) Clean the drive gear attaching bolts.
(2) Use an Ml0 x 1.25 tap to remove the adhesive adhering
to the threaded holes of the drive gear, and then cleanthe threaded holes by applying compressed air.
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27-38REAR AXLE - Differential Carrier
L
Snap ringllFOOO9
llFOOl0
11 FOO20
8-01
380
F‘/T\br -1lFOO12
(4) Using the special tool, to apply the preload, turn down
both right and left side bearing nuts on half the distancebetween centers of two neighboring holes.
\d(5) Fit the snap ring at either position shown to lock the
side bearing nut.
(6) Check the drive gear and drive pinion for tooth contact.
If poor contact is evident, make adjustment. (Refer to
P.27-28.)(7) Measure the drive gear
runout at the shoulder on the
reverse side of the drive gear.
Limit: 0.05 mm
(.002 in.)
(8) If the drive gear
runout exceeds the limit, reinstall by
changing the phase of the drive gear and differential
’
case, and remeasure.d
24. INSTALLATION OF OIL SEAL
(1) Using the special tool, install the oil seal flush with the
gear carrier end face.
(2) Apply a thin coat of Multi-purpose grease to the oil seal
lip.
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REAR AXLE - LSD Case Assembly27-39
LSD CASE ASSEMBLY
/DISASSEMBLY AND REASSEMBLYM27NE- -
L
Disassemblysteps1. Screw
l +2. Differential case A+I) I)+3. Thrust washer (L.H.)1 lFOO33
4. Viscous unit‘M 5. Pinion mate washer*a 6. Differential pinion mate7. Differential pinion shaft
8. Differential side gear (R.H.)l *9. Thrust washer (R.H.)l 10. Differential case B
Feeler gauge
INSPECTION BEFORE DISASSEMBLYM27NFAA
1. CHECKING THE DIFFERENTIAL GEAR BACKLASH
(1) Secure the differential case assembly in a vise so thatthe differential side gear (right) is facing upward.
CautionWhen securing the vise, be sure not to hold the
differential case assembly too tightly.
(2) Insert a 0.03 mm LOO12 in.) feeler gauge at two places
(diagonally) between differential case
I3 and the thrust
washer (right).
CautionDo not insert a feeler gauge in the oil groove of
differential case
B.
7--u/Differential side Thrust washer
gear (right)(right)llFO037

iREAR AXLE
- LSD Case Assembly27-41
viscous unit
bSpline part
(5) Check the spline part of the viscous unit for stepped wear
or damage, and check the contact surface with differentialcase
B.(6) Check the side gear (left) of the viscous unit for unusual
wear or damage.
Pinion mate
llPO134
Feeler qauqe
/11 FO03Feeler
Differential g;ar (right)Th‘rust kasher (righl
11 FOO3i
SERVICE POINTS OF REASSEMBLYM27NlhA
10. INSTALLATION OF THE DIFFERENTIAL CASE B
/ 2.
DIFFERENTIAL CASE A
Align the mating marks of differential cases B and A, and
assemble the cases.
6.INSTALLATION OF THE DIFFERENTIAL PINION MATE /5. PINION MATE WASHER
With the washer in the position shown in the illustration,
install to the differential pinion shaft, and then install to
differential case B.3. SELECTION OF THE THRUST WASHER (LEFT)
If the differential side gear and pinion mate gear have beenreplaced, select the thrust washer (left) by following the
steps below.
(1) Wash the differential side gear and pinion mate gear inunleaded gasoline to remove all oil, grease, etc.
(2) Install the previously used thrust washers (being carefulthe left and right ones are used at the correct side),
together with the gears, viscous unit, pinion mate
washer and pinion shaft, to differential cases A and B,and then, using screws, secure them temporarily.
(3) Secure the differential case assembly in a vise so thatthe differential side gear (right) is facing upward.
Caution
When securing in the vise, be sure not to hold thedifferential case assembly too tightly.
(4) Insert a 0.03 mm j.0012 in.) feeler gauge at two places
(diagonally) between differential case B and the thrust
washer (right).
CautionDo not insert a feeler gauge in the oil groove of
differential case B.
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