service MITSUBISHI 3000GT 1991 Service Manual

DISASSEMBLYREAR AXLE
- Differential Carrier27-29
M27lF- -
inspection Before Disassemblyl Final Drive Gear Backlash(Refer to P.27-26.)l Drive Gear Runout(Refer to P.27-26.)l Final Drive Gear Tooth Contact(Refer to P.27-26.)Disassembly steps
1. Differential cover assembly2.Vent plug
3.Oil seal
4.Snap ring4*5. Side bearing nut4*6. Side bearing outer race7. Differential case assembly4*8. Side bearing inner race4*9. Drive gear (for 4WS)4*10. Drive gear
11. Spring pin (for 4WS)4*12. LSD case (refer to P.2759.)4*13. Self-locking nut14:Washer
4*
4*
4*4*4*
64 111 FO032
15. Drive pinion assembly
16. Companion flange
17. Drive pinion front shim
(for preload adjustment)18. Drive pinion spacer19. Drive pinion rear bearing inner race20. Drive pinion rear shim
(for pinion height adjustment)
21. Drive pinion
22. Oil seal
23. Drive pinion front bearing
24. Drive pinion rear bearing outer race
25. Differential carrier’
SERVICE POINTS OF DISASSEMBLYM27lGBD5. REMOVAL OF SIDE BEARING NUT
Using the special tool, remove the side bearing nut.
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REAR AXLE - Differential Carrier
27-33
Lubrication, Sealing and Adhesion Points
L
11lwO.llFOO11
Sealant: 3M AID Part No. 8663 or equivalentllFO032
Adhesive: 3M Stud Locking Part
No. 4170 or equivalent
Spring pinDjive gear
View A
ilA0262llA0261
SERVICE POINTS OF REASSEMBLYM27UBG
1. INSTALLATION OF SPRING PIN (FOR
4WS)
Tap the spring pin into the differential case to the position
shown in the illustration before
press fitting the rear wheel
oil pump drive gear. The notch on the spring pin should bein the position shown in the illustration.
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27-40REAR AXLE - LSD Case Assembly
r
Differential side
Differential
Differential
pinion mate
Thrust washer
llPO128
Pinion matewasherllPO12’
1 lFOO35(3) Insert the special tool at the spline part of differential
case B (right) and check to be sure the side gear (right)
rotates.
(4) Then insert a 0.09 mm t.0035 in.) feeler gauge to \Ljreplace a 0.03 mm
(.0012 in.) gauge.
(5) Insert the special tool at the spline part of the
differential side gear (right) and check to be sure the
side gear (right) does not rotate.
Differential gear backlash
Standard value (clearance in thiust direction ofside gear): 0.03
- 0.09 mm (.0012 - .0035 in.)
NOTE
If the clearance in the thrust direction of the side gear iswithin the standard value range, the backlash of the
differential gear is normal.
(6) If the clearance in the thrust direction of the side gear is
not within the standard value range, remove differentialcase A and make the adjustment by adjusting the
thickness of the thrust washer (left).
SERVICE POINTS OF DISASSEMBLYM27NGAA
3. REMOVAL OF THE THRUST WASHER (LEFT)
/ 9.
THRUST WASHER (RIGHT)The thrust washers (left and right) are of different thick-
ness, and so should be discriminated in some way for
reference during installation.
INSPECTIONM27NHAA
(1) Check the gears and differential pinion shaft for unusual
wear or damage.
(2) Check the spline part of the differential side gear (right) forstepped wear or damage.
(3) Check the thrust washer and pinion mate washer for
unusual wear of contact surfaces, heat damage or other
damage.(4) Check differential cases A and B for unusual wear of
contact surfaces, heat damage or other damage.
0: Contact surface with the viscous unit
0: Contact sur acef
with the pinion mate washer
@ and 0: Contact surfaces with thrust washer
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1

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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31-1
ii~
WHEEL.I
AND TIRE~
CONTENTSM3IA& -
SERVICE ADJUSTMENT PROCEDURES............4TROUBLESHOOTING:...........................................3
Tire Inflation Pressure Check................................4Bald Spots
Tire Wear Check....................................................4
Cracked Treads
Wheel Runout Check............................................4Feathered Edge
SPECIFICATIONS2Rapid Wear at Center....................................................
General Specifications2Rapid Wear at Shoulders........................................
Service Specifications........................................2Scalloped Wear
Torque Specifications2Wear on One Side............................................

31-2WHEEL AND TIRE - Specifications
SPECIFICATIONS
GENERAL SPECIFICATIONS
MOICA- -
‘\
Items
Wheel
Tire size
Wheel type
Wheel size
Amount of wheel offsetmm (in.)
Tire inflation pressure
kPa (psi)
Front
Rear
DOHC-N/A
225l55R 16 93U
Aluminum type
16X8J ’
46 (1.8)
220 (32)
200 (29)DOHC-T/C
245145ZR 17
Aluminum type
17 x
8.5J
46 (1.8)
220 (32)
200 (29)
Spare wheel
Tire size
T125190D16T135/90D16
Wheel size
l6x4Tl6x4T
Amount of wheel offsetmm (in.)46 (1.8)46 (1.8)
Tire inflation pressurekPa (psi)
420 (60)420 (60)
SERVICE SPECIFICATIONSM31CB. -
Items
Specifications
Limit
Wheel
runout
Radialmm (in.)2.0 (.08)
Lateralmm (in.)2.0 t.08)
Tread depth of tiremm (in.)1.6 (.06)
TORQUE SPECIFICATIONSMBlCC- -
ItemsNm
Hub nuts120- 140
ft.lbs.
87-iO1TSB Revision

WHEEL AND TIRE - Service Adiustment ProceduresllFOO1753Y510
Wear indicator
/LateralllFOO1:
1SERVICE ADJUSTMENT PROCEDURES
TIRE INFLATION PRESSURE CHECKM3lFDA.E
Check the inflation pressure of the tires. If it is not within the
standard value, make the necessary adjustment.
TIRE WEAR CHECKMJlFBAC
Measure the tread depth of tires.
Limit: 1.6 mm
(.06 in.)
If the remaining tread depth is less than the limit, replace the
tire.
NOTE
When the tread depth of tire is reduced to 1.6 mm (.06 in.) orless, wear indicator will appear.
WHEEL RUNOUT CHECKM31 FCAEJack up the vehicle so that the wheels are clear of the floor.
While slowly turning the wheel, measure wheel runout with a
dial indicator.
Limit:
Radial2.0 mm
(.08 in.)
Lateral2.0 mm (.08 in.)
If wheel
runout exceeds the limit, replace the wheel.
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32-1
POWER PLANTMOUNT
CONTENTSMZAA- _
ENGINE MOUNTING........................................
3SPECIFICATIONS................................................2
ENGINE ROLL STOPPER
5Service Specifications....................................2....................................
TRANSAXLE MOUNTING................................4RIGHT MEMBER, LEFT MEMBER AND
CROSSMEMBER”................................................6TROUBLESHOOTING........................................2
SPECIAL TOOLSAbnormal Noise....................................................
2
Excessive Engine Wobble or Vibration
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
(1)A Supplemental Restraint System (SRS), which uses a driver-side air bag, has been installed in the 3000GT.(2)The SRS includes the following components: impact sensors, SRS diagnosis unit: SRS warning light, air bagmodule, clock spring, interconnecting wiring. Other SRS-related components (that may have to be
removed/installed in connection with SRS service or maintenance) are indicated in the table of contents byan asterisk (*).
WARNING!(1)Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to
personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver (from
rendering the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an
authorized MITSUBISHI dealer.(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B
-Supplemental Restraint System (SRS), before beginning any service or maintenance of any component of theSRS or any SRS-related component.

32-2POWER PLANT MOUNT -Specifications / Special Tools / Troubleshooting
SPECIFICATIONS
SERVICE SPECIFICATIONSM32CB-.
IItemsSpecificationsI
Standard value
No. 1 crossmember
Bushing (B) projectionmm (in.)
Crossmember
Bushing (A) projectionmm (in.)
Bushing (B) projectionmm (in.)7.5
- 10.5 (.30 - .41)
7.2 - 10.2 (.28 - .40)
6.5 - 9.5 (.26 - .37)
SPECIAL TOOLS
Bushing removerand installer
TROUBLESHOOTINGTSB Revision

POWER PLANT MOUNT - Engine Mounting
ENGINE MOUNTING
REMOVAL AND INSTALLATION
32-3
l Raise and Suspend the Engine to the12 Nm
lOO-120Nm(9 ftlbs.
72-87ftlbs. > &6
rI’ I/4
c*1. Connection for air hose G
2. Cruise control pump and link assembly

3. Engine mount bracket and body
connection bolt
4. Engine mount bracket
l *5. Mounting stopper
6. Dynamic damperOlFOO50
3emoval steps
SERVICE POINT OF REMOVALM32GBAK2. REMOVAL OF CRUISE CONTROL PUMP AND LINK
ASSEMBLY
Remove the actuator mounting nuts and place the actuatorwhere it will not interfere with the work.
INSPECTIONM32GCAMl
l Check each insulator for cracks or damage.
l Check each bracket for deformation or damage.
1SERVICE POINT OF INSTALLATIONM32GDAW
5. INSTALLATION OF MOUNTING STOPPER
Attach the engine mounting bracket so that the arrow mark
on the mounting stopper is in the direction as shown in the
illustration.TSB Revision