service MITSUBISHI 3000GT 1991 Service Manual

INTAKE AND EXHAUST - Air Intake Plenum 15-15
Throttle body
Protrusion
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INSPECTIONMlSUCAD3
Check the following points; replace the part if a problem is
found.
AIR INTAKE PLENUM
(1) Check air intake plenum for defect or cracks. Replace if
defective or cracked.
(2) Check load (negative pressure) of drain port. Clean if
required.
SERVICE POINT OF INSTALLATIONMl5UoAB3
4. INSTALLATION OF THROTTLE BODY GASKET
Install with the gasket protrusion positioned as shown.
CautionIf installed in an incorrect direction, idling failure or
other problems may occur.
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15-16INTAKE AND EXHAUST - Intake Manifold
INTAKE MANIFOLD
REMOVAL AND INSTALLATION
Pre-removal Operationl Release of Residual Pressure fromHigh Pressure Fuel Hose(Refer to GROUP 13-ServiceAdjustment Procedures.)l Draining of Engine Coolant (Refer
to GROUP 00 -Maintenance Service,)
l Removal of Air Intake Plenum(Referto P.15-13, 14.)5Nm
lo-13Nm4 ft.lbs.8-9ftJbs. w2\I
Post-installation Operationl Installation of Air Intake Plenum
(Refer to P.1.5-13. 14.)l Filling of Engine Coolant
(Refer to GROUP 00 - Maintenance
Service.)
l Adjustment of Accelerator Cable(Referto GROUP 13-EngineControl.). Checkina for Fuel Leakage6
5
2 :‘;bs.)
gp,.qgs ~-zt!EJ8OSFOO24
Removal steps
I. Connection for high-pressure fuel hose
2. O-ring
3. Connection for fuel return hose
4. Connection for vacuum hoses
5. Connection for injector connector
6. Delivery pipe (with injectors)
7. Insulators
8. Timing belt upper cover
I)*9. Intake manifold mounting nut I)* 10. Intake manifold mounting nut II. Cone disc spring
12. Intake manifold-
** 13. Intake manifold gasket
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INTAKE AND EXHAUST - Intake Manifold.15-1705LOO84
ProtrusionFRONT
ProtrusionA\
\ProtrusionProtrusidnOIL0857
FRONT
Intake mamfold7lN0090
APPLY~~ lubricant
INSPECTIONMlIMCATZCheck the following points; replace the part if a problem is
found.
INTAKE MANIFOLD(1) Check for damage or cracking of any part.
(2) Clogging of the negative pressure (vacuum) outlet port, or
clogging of the gas passages.
(3) Check deflection of installation surface with straight edge
and thickness gauge.
Standard value
: 0.15 mm (.0059 in.) or less
Limit
: 0.2 mm (.008 in.)
SERVICE POINTS OF INSTALLATIONMISMDAH
13. INSTALLATION OF INTAKE MANIFOLD GASKETInstall with gasket protrusions in the position illustrated.
10. INSTALLATION OF INTAKE MANIFOLD MOUNTING
NUT
Tighten the intake manifold mounting nuts one bank after
the other by the following ‘procedure.
(1) Tighten the nuts in the front bank to 3 to 5 Nm (2.2 to
3.6 ft.lbs.).
(2) Tighten the nuts in the rear bank to 12 to 15 Nm (9 to 11ft.lbs.).
(3) Tighten the nuts in the front bank to 12 to 15 Nm (9 to
11 ft.lbs.).
(4) Repeat steps (2) and (3) one more time respectively.
9. INSTALLATION OF INTAKE MANIFOLD MOUNTING
NUT
Apply lubricant sparingly to the intake manifold mounting
nuts.
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15-18INTAKE AND EXHAUST - Turbocharger (Front)
TURBOCHARGER (FRONT)
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operationl Removal and Installation of Radiator(Refer to GROUP 14 - Radiator.)l Removal and Installation of Transmission
l Rerr
IPipeioval and Installation of Front Exhaust(Refer to P.15-31.)
lJl QG!?
IMlSLA-AI
40 - 47 ft.lbs.
1\29 - 11 ft.lbs.Removal steps
** 1. Air hose C*+2. Air intake hose B*+ 3. Air hose D4. Air hose Al *5. Air hose B.6. Air pipe B
l +7. Air hose E8. Air pipe C
9. Drive belt(Refer to GROUP 11 - Service
Adjustment Procedures.)
10. Alternator assembly(Referto GROUP 16-Alternator.)
11. Engine oil level gauge guide
12. Heat protector B-13Nm
‘9 ft.lbs.
-‘25
05FOO43
13. Water pipe A
14. Water pipe B
15. Connection of oxygen sensor
16. Turbocharger
& fitting assembly
17. Gasket
18. Ring
l * ** 19. Oxygen sensor
20. Turbocharger stay
21. Exhaust fitting
22. Gasket
23. Oil return pipe
l * 24. Turbocharger assemblyl *25. Air conditioner compressor
26. Tension pulley bracket
27. Air conditioner compressor bracket
28. Oil pipe
I
LJ
1 TSB Revision

INTAKE AND EXHAUST - Turbocharger (Front)15-19
05FOO2(
SERVICE POINTS OF REMOVALM15LBAE
19. REMOVAL OF OXYGEN SENSORDisconnect the connector of the oxygen sensor, and install
the special tool to the oxygen sensor.
25. DISCONNECTION OF AIR CONDITIONER COMPRES-
SORDisconnect air conditioner compressor with hoses from the
bracket.
NOTEThe removed air conditioner compressor should be fas-
tened (by using rope, etc.) in a position that will not interfere
with the removal/installation of the turbocharger assembly.
INSPECTION
TURBOCHARGER ASSEMBLY CHECKMlSLCADl
lVisually check the turbine wheel and the compressor wheel
for cracking or other damage.
l Check whether the turbine wheel and the compressor
wheel can be easily turned by hand.
l Check for oil leakage from the turbocharger assembly.
lCheck whether or not the waste gate valve remains open. If
any problem is found, replace the part after disassembly.
OIL PIPE AND OIL-RETURN PIPE CHECKCheck the oil pipe and oil-return pipe for clogging, bending, or
other damage.
If there is clogging, clean it.
SERVICE POINTS OF INSTALLATIONMllLDAE
24. INSTALLATION OF TURBOCHARGER ASSEMBLYClean the alignment surfaces shown in the illustration.
Supply clean engine oil through the oil pipe installation hole
of the turbocharger assembly.
CautionWhen cleaning, care must be taken so that a piece of
the gasket does not enter the oil passage hole.
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INTAKE AND EXHAUST - Turbocharger (Rear)
0
Comrxessorwheel \u ~i, rOlR0182
I05FOO19
SERVICE POINT OF REMOVALM15LBAF
10. REMOVAL OF OXYGEN SENSOR
Disconnect the connector of the oxygen sensor, and install
’the special tool to the oxygen sensor.
d,
INSPECTION
TURBOCHARGER ASSEMBLY CHECK
M15LCADZ
lVisually check the turbine wheel and the compressor wheel
for cracking or other damage.
l Check whether the turbine wheel and the compressor
wheel can be
easily.turned by hand.
l Check for oil leakage from the turbocharger assembly.
lCheck whether or not the waste gate valve remains open. If
any problem is found, replace the part after disassembly.
OIL PIPE AND OIL-RETURN PIPE CHECKCheck the oil pipe and oil-return pipe for clogging, bending, or
other damage.
If there is clogging, clean it.
SERVICE POINTS OF INSTALLATIONMlBLDAF
23. INSTALLATION OF TURBOCHARGER ASSEMBLYClean the alignment surfaces shown in the illustration.
CautionWhen cleaning, care must be taken so that a piece of
the gasket does not enter the oil passage hole.
14. INSTALLATION OF OIL PIPESupply clean engine oil through the oil pipe installation hole
of the turbocharger assembly.
10. INSTALLATION OF OXYGEN SENSORUse the special tool to install the oxygen sensor.
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15-24INTAKE AND EXHAUST - Turbocharger
TURBOCHARGERAIIlSLE- _
DISASSEMBLY AND REASSEMBLY
Disassembly steps
I Snap pin2. Waste gate actuator
3. Coupling
I)+ 4. Turbine housing** I)* 5. Snap ring+I) l *6. Cartridge assemblyl * 7. O-ring
8. Compressor cover
12 Nm
71N0096
I61N0053
SERVICE POINTS OF DISASSEMBLYMISLFAC5. REMOVAL OF SNAP RING
Place the compressor cover assembly on the floor with its
end surface down and remove the snap ring with pliers.
Caution
During removal, hold with a finger the snap ring whichcan spring out.
1 TSB Revision6. REMOVAL OF CARTRIDGE ASSEMBLY
Remove the cartridge assembly by tapping the compressor
cover with a soft hammer.
Caution
Some resistance will be experienced in the removal dueto the O-ring on the cartridge assembly.

INTAKE AND EXHAUST - Turbocharger
INSPECTION
TURBOCHARGER
15-25MllLGAB
(I) Manually open and close the waste gate valve to make sure
it operates freely.
(2)Inspect the oil passage in the cartridge for signs of deposits
or blockage.
(3) Clean the inlet section of the compressor cover with a rag.
Inspect it for signs of contact with the compressor turbine.
If worn, replace it.
L/
O-ring
3EN23C3062
snap ring Chamfered
.
v cartr~d~om,,ir
,jFcover
WI61 NO070
SERVICE POINTS OF REASSEMBLYM15LHAC7. INSTALLATION OF O-RING
Coat the inner surface of a new O-ring with a thin film of
engine oil, and set it in the groove of the cartridge
assembly.
Caution
Be careful not to damage the O-ring while installing itas oil leakage could result.
6. INSTALLATION OF CARTRIDGE ASSEMBLY
(1) Coat the outer circumference of the cartridge assembly
O-ring with a thin film of engine oil.
(2) Install the cartridge assembly on the compressor cover
by aligning the dowel pin.
CautionWhen installing the cartridge assembly on the
compressor cover, be careful not to damage the
compressor wheel blades.5. INSTALLATION OF SNAP RING
Place the cartridge assembly with the compressor cover
faced down and install the snap ring.
Caution
Install the snap ring with the tapered side of its outsidediameter up.
TSB Revision4. INSTALLATION OF TURBINE HOUSING
Install the compressor cover and cartridge assembly on the
turbine housing with the dowel pin in alignment.
Caution
1.Be careful not to damage the blades of the turbine
wheel.2. Be careful to install the turbine housing in the
correct direction.

INTAKE AND EXHAUST - Exhaust Manifold 15-27
EXHAUST MANIFOLD
iREMOVAL AND INSTALLATION
Pre-removal and Post-installation Operationl Removal and Installation of Front Exhaust Pipe
l Removal and Installation of Condenser Fan Motor
Assembly
(Refer to GROUP 14 - Radiator.)
12-15Nm
P9 - 11 ft.lbs.
45 Nm33 ft.lbs.\24Nm
17ft.lbs.1
Li2
l-
45 Nm33 ft.lbs.
MSNA-8Removal steps of exhaust manifold (front)
1. Drive belt (Alternator)(Refer to GROUP 11 -Service Adjustment procedures)
2. Alternator assembly
3. Oil level gauge guide
4. Heat protector
5. Exhaust manifold (front)
6. Gasket
60 Nm,43 ft.lbs.
33 ftlbs.1 05F00337
8Removal steps of exhaust manifold (rear)
7. Stud
8. Heat protector
9. EGR pipe
IO. Exhaust manifold (rear)11. Gasket
INSPECTIONhllSNCAU2
Check the following points; replace the part if a problem is
found.
l Check for damage of cracking of any part.
TSB Revision
I

15-28INTAKE AND EXHAUST - Exhaust Manifold
EXHAUST MANIFOLD
REMOVAL AND INSTALLATION
MlINA-C
12-15Nm9 - 11 ft.lbs.
Pre-removal and Post-installation Operationl Removal and Installation of Turbocharger Assembly(Refer to P.15-18, 21.)Removal steps of exhaust manifold (front)
I. Heat protector** 2. Exhaust manifold (front)** 3. Exhaust manifold stay4. GasketRemoval steps of exhaust manifold (rear)
5. Heat protector*+ 6. Exhaust manifold (rear)7. Gasket05FOO25
v
Cone disc spring
7lNOll5TSB Revision
INSPECTIONMl5NCAU3
Check the following points; replace the part if a problem is
found.
l Check for damage of cracking of any part.
SERVICE POINTS OF INSTALLATIONMlBNDAH
6. INSTALLATION OF EXHAUST MANIFOLD (REAR)
Tighten the nuts in the following order.
(1) Tighten five nuts @ to 30 Nm (22 ft.lbs.1.(2) Tighten nuts
@I to 47 - 53 Nm (34 - 38 ft.lbs.1.(3) Back off nuts @ until torque value of 10 Nm
(7 ft.lbs.1 is
achieved.
(4) Tighten nuts
@I to 29 - 31 Nm (21 - 22 ft.lbs.1.
NOTE
1.Fit the cone disc spring with the grooved side facing
the nut.
2. Install the nut, cone disc spring and washer in the
order shown in the illustration.
iJ
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