MITSUBISHI 3000GT 1991 Service Manual

INTAKE AND EXHAUST - Turbocharger (Rear)15-21
TURBOCHARGER (REAR)
iREMOVAL AND INSTALLATION
/
id
Post-installation ODerationIl Installation of Front Exhaust Pipe(Referto P.15-31.)l Refilling of the Engine Coolant
(Refer to GROUP 00 - Maintenance
l Adjustment of Accelerator Cable1~~~~o~~ GROUP 13 - Engine
lo-13Nm7 - 9 ft.lbs.
6.
7 55-65Nmb
5 40 - 47 ft.lbs.i18Nm’
d13 ft.lbs.
MlSLA-B
0-nng
05FOOO3Removal steps
1. Battery2. Connection of accelerator cable
** 3, pg,t;eye)l * 4.
AirpipeA5. Heat protector F
6. Clutch booster vacuum hose
7. Connection of accelerator cable
(pedal side)
I)+8. Air intake hose AO+9. Air intake hose Cl * I)* 10. Oxygen sensor
11. Heat protector D12. EGR pipe
9Nmv 10 //--!
-7 ft.lbs.45 Nm33 ft.lbs.LIZ-15NmOSFOO419- 11 ft.lbs.
13.Eye boltl * 14. Oil pipe15.EGR valve16. Water pipe A
17. Water pipe B
18.Exhaust fitting
19. Heat protector E
20.Gasket21,. Turbocharger & return pipe assembly
22. Oil return pipe
l * 23. Turbocharger assembly24.Gasket25.Ring26. Exhaust fitting stayTSB Revision

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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INTAKE AND EXHAUST - Turbocharger (Rear)15-23
Air intake hose A
Air intake hose BHose end
paint
3
9.INSTALLATION OF AIR INTAKE HOSE C / 8. AIR INTAKE
HOSE AEngaging the notches with
n marks at the points indicated
by the arrows insert until seated.
Insert the turbocharger end of air intake hose C completely.
4. INSTALLATION OF AIR PIPE A
/ 3. AIR HOSE A
Aligning the marks at the points indicated by-the arrows,
insert securely into the stepped portion of the pipe.
CautionBe careful not to allow any foreign matter to get into
the hoses or pipes..
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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.

15-26INTAKE AND EXHAUST - Turbocharger
TEST OF WASTE GATE ACTUATOR OPERATIONMlSLlAC
Using a tester, apply a pressure of approx. 48
kPa (6.8 psi) to
the actuator and make sure that the rod moves.
Lj
Caution90
not apply a pressure of more than 61 kPa (8.7 psi) to theactuator. Otherwise, diaphragm may be damaged.
/Never attempt to adjust the waste gate valve.
1 TSB RevisionI

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.
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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.
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INTAKE AND EXHAUST - Exhaust Manifold 15-29
Exhaust
manifold
stay
Exhaustmanifold
05FOO17
Cone disc spring71NOll;3. INSTALLATION OF EXHAUST MANIFOLD STAY
With the exhaust manifold stay resting on the exhaust
manifold, fit it along with the exhaust manifold over the
studs.
2.
INSTALLATION OF EXHAUST MANIFOLD (FRONT)
Tighten the nuts in the following order.
(1) Tighten four nuts @ to 30 Nm (22 ft.lbs.1.(2) Temporarily tighten the turbocharger to the exhaust
manifold.
(3) Tighten nut @ to 30 Nm (22
ft.lbs.1.(4) Tighten nuts @ and @ to 47
- 53 Nm (34 - 38 ft.lbs.).
(5) Back off nuts @ and @ until torque value of
10 Nm (7
ftlbs.) is achieved.
(6) Tighten nuts @ and @ 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.
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15-30 INTAKE AND EXHAUST -Exhaust Pipe, Main Muffler and Catalytic Converter
EXHAUST PIPE, MAIN MUFFLER AND CATALYTIC CONVERTER
MlLRA-A
REMOVAL AND INSTALLATION
1. Main muffler and center exhaust50 Nm36
Fbs.
I\
yil / \2: h2yR ‘i”
3. Rubber hangers, ,4. Rubber nanger5. Main muffler6.Mouldings7.Hanger brackets8. Catalytic converter and center
exhaust pipe installation bolts
9.Hanger bracket10.Protector11.Rubber hangers12. Center exhaust pipe13.Gasket
---------179fl
/-r
9 ftlbs./----------------m _
I
!
14. Rubber hangers
15. Hanger bracket
16. Hanger brackets
17. Rear floor heat protector13 Nm
13 Nm
9 ftlbs.9 ft,lbs.5Nm
4 ft.lbs.
35hlm
25 ft.lbs.18. Catalytic converter and front
exhaust pipe installation bolts
19. Catalytic converter
20. Gasket
21. Oxygen sensor connection
22. Self-locking nuts9
ft.lbs.\/23.Rubberhanger24. Front exhaust pipe25.Gasket26.Hangerbracket27. Front floor heat protector
05FOO39
SERVICE POINTS OF REMOVAL
3.4. REMOVAL OF RUBBER HANGER / 5. MAIN MUFFLERSupport with a transmission jack, etc.
INSPECTIONMlSRCAM
l Check the mufflers and pipes for corrosion or damage.
l Check the rubber hangers for deterioration or damage.
l Check for gas leakage from mufflers and pipes.wision
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