1991 MITSUBISHI 3000GT belt

ENGINE - Special ToolsII-9
Use withMD998765
Removal and installation of piston pinUse with MD998764
Supporting thecrancrankshaft bolt and
pulley areremoved
orreinstalled. Use together with MB990767-01
Tensioner pulley
socket wrenchAdjustment of timing belt
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II-IOENGINE - Troubleshooting
TROUBLESHOOTINGmiwm
SymptomProbable cause
RemedyI,aJ
Compression too low) Cylinder head gasket blown1 Replace gasketI
Piston ring worn or damage
Piston or cylinder worn
Replace rings
Repair or replace piston and/or cylinder
block
Valve seat worn or damage
Repair or replace valve and/or seat ring
3il pressure drop
Engine oil level too lowCheck engine oil level
Oil pressure switch faulty
Oil filter clogged
Replace oil pressure switch
Install new filter
Oil pump gears or cover worn
Thin or diluted engine oilReplace gears and/or cover
Change engine oil to correct viscosity
1 Oil relief valve stuck (opened)) Repair relief valve
Excessive bearing clearance
Replace bearingsIbOil relief valve stuck (closed)
Incorrect lash adjusterRepair relief valve
Replace lash adjuster Oil pressure too high
Noisy valves
Thin or diluted engine oil (low oil pressure)Change engine oil
Valve stem or valve guide worn or damageReplace valve and/or guide
Connecting rod noise/
nain bearing noiseInsufficient oil supplyCheck engine oil level
Thin or diluted engine oilChange engine oil
Excessive bearing clearanceReplace bearings
Timing belt noise
Incorrect belt tensionAdjust belt tension
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ENGINE - Service Adjustment ProceduresII-IISERVICE ADJUSTMENT PROCEDURES

AlternatorTension pulley
IIdler pulley/
Tension pulleyCrankshaftpulleyOlFOOO

Tenston pulley
Air conditionerCrankshaftcompressor pulleypulleyOlFOO8
,
MllFMBGDRIVE BELTS TENSION ADJUSTMENT
(1) Check that the belts are not damaged and are properly fit
,into the pulley grooves.
Caution1. When installing the V-ribbed belt, check that the
V-ribs are properly fit without misalignment.
2. If creaking or slippage is observed, check the belt
for wear, damage, or breakage on the pulley contact
surface, check the pulley for scoring, in addition to
sag inspection.3. Check that the V-ribbed belt is not resting on the
tension pulley or idler pulley flange.
(2) Apply 100 N (22
Ibs.) force to the belt back midway
between the pulleys as shown in the illustration, measure
the deflection or by using a belt-tension gauge, check the
belt’s tension.
Standard value:
Tension350-600650-850450-600N (Ibs.)(77-132)(143-187)(99-132)
For P/S
pump
ItemsAdjustment valueCheck valueNew beltUsed belt
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II-12ENGINE - Service Adjustment Procedures-
r
AdJl
bolt
Alternator wllev
haft
Fixing nutOlFOOO8
Alternator pulley
Adjusting bolt
/Crankshaftpulley
Air contionercompressorpulleyw Tension pulleyFlxtng nutOlN007.
Crankshaft pulleyOlN007TENSION ADJUSTMENT OF THE ALTERNATOR DRIVE
BELT
I(1) Remove front under cover panel ’
aero> (Refer to GROUP 51 - Aero Parts.).\\
3 ’
(2) Remove under covers (front L.H., side L.H.).
(3) Loosen tension pulley fixing nut.
(4) Adjust belt deflection with adjusting bolt.
(5) Tighten fixing bolt.
(6) Run the engine one time or more.
(7) Check the belt tension. Readjust, if necessary.
(8) Install under covers.
DEFLECTION ADJUSTMENT OF THE ALTERNATOR AND
AIR CONDITIONER COMPRESSOR DRIVE BELT with air conditioner>
(1) Use straight handle box wrench to loosen tension pulley
fixing nut.
(2) Adjust belt deflection with adjusting bolt.
(3) Use straight handle box wrench to tighten fixing nut.
(4) Run the engine one time or more.
(5) Check the belt deflection. Readjust, if necessary.
DEFLECTION ADJUSTMENT OF POWER STEERING PUMP
DRIVE BELT(1) Insert an extension bar (insertion depth 12.7 mm), etc. into
the opening at the end of the tension pulley bracket.
(2) Loosen the tension pulley fixing bolts in the order of B and
(3)
iove the extension bar installed to the tension pulley in the‘LJdirection of arrow to adjust the belt tension.
(4) Tighten the tension pulley fixing bolts in the order of A and
8.Tightening torque: 35
- 50 Nm (25 - 36 ftlbs,)(5) Give the crankshaft two turns in normal direction (clock-
wise) to run in the belt.
(6) Check the belt deflection. Readjust, if necessary.
1 TSB Revision

ENGINE - Engine AssemblyII-17
ENGINE ASSEMBLY
/REMOVAL AND INSTALLATION
I
Pre-removal Operationl Release of Residual Pressure from HighPressure Fuel Hose(Refer to GROUP 13 -Service AdjustmentProcedures,)l Removal of Cruise Control Pump andLink Assembly(Refer to GROUP 13 - Cruise Control.)l Removal of Hood(RefertoGROUP42A-Hood.)
l
Removal of Air Hose and Air Pipe (Refer to GROUP 15 - Inter Cooler.)l Removal of Front Exhaust Pipe(Refer to GROUP 15 - Exhaust Pipe and Main Muffler.l Removal of Transaxle Assembly(Refer to GROUP 22, 23 -Transaxle Assembly.)l Removal of Radiator(Refer to GROUP 14-Radiator.)
Post-installation Operationl Installation of Radiator(Refer to GROUP 14 - Radiator.)l Installation of Cruise Control Pump andLink Assembly(Refer to GROUP 13 -Cruise Control.)l Installation of Transaxle Assembly(Refer to GROUP 22,23 -Transaxle Assembly.)l lnstallatron of Front Exhaust Pipe(Refer to GROUP 15 - Exhaust Pipe and Main Muffler.)l Installation of Air Hose and Air Pipe (Refer to GROUP 14 - Inter Cooler.)l Installation of Hood(Refer to GROUP 42A- Hood.)l Supplying of Engine Oil(Refer to GROUP 00 - Maintenance Service.)l Adjustment of the Accelerator Cable(Refer to GROUP 13 - Engine Control.)
MllSA-B
4 ft.lbs.
6
40-45 Nm
29 - 33 fklbs.
Removal steps
1. Connection of accelerator cable11. Drive belt (Alternator and air conditioner)
2. Connection of brake booster vacuum hose(Refer to P.l l-l 1.)
3. Connection of booster vacuum12. Drive belt (Power steering)
hose
(Referto P.l l-l I.)4. Connection of fuel return hose13. Connection of alternator harness
5. Connection of fuel high pressure hose14. Oxygen sensor connector
6. Connection of ground cablel *15. Air conditioner compressor
7. Solenoid valve assembly4w
16. Power steering oil pump
8. Connection of vapor hose17. Oil pressure switch connector (Power steer-9. Connection of heater hoseing)10. EGR temperature sensor connector18. Connection of oil cooler pipes

OlFOO43
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II-20ENGINE - Camshaft Oil Seals
CAMSHAFT OIL SEALS
RElVjOVAL AND INSTALLATION
MllZA-B
Pre-removal and Post-installation Operationl Removal and Installation of Timing Belt(Refer to P.l l-26.)l Removal and Installation of Intake Manifold(Refer to GROUP 15 - Intake Manifold.)3Nm
2.2 ftlbs.
3Nm
2.2 f’tlbs.
$1(Refer to GROUP 13 - Engine Control.)3Nm
90 Nm65 ft.lbs.
Removal steps
1. Center cover (front bank)
2. Connection for spark plug cables
3. Connection for breather hose
4. Connection for PCV hose
l *5. Rocker cover** l *6. Camshaft sprocketa* I)* 7. Camshaft oil seals
io01 NO040
01 NO042
1.4 in.) 4(.4 in.)
OlA0047
Sealant: 3M ATD PartNo. 8660 or equivalent
1 TSB Revision

ENGINE - Winder Head Gasket11-23
CYLINDER HEAD GASKETREMOVAL AND INSTALLATION
MllJA-6
Pre-removal and Post-installation Operation
Draining and Supplying
l Engine Coolant(Refer to GROUP 00 -Maintenance Service.)Removal-and Installationl Air Intake Manifold(Refer to GROUP 15 -Air intake Manifold.)l Turbocharger (Refer to GROUP 15 -Turbocharger.)l Exhaust Manifold(Refer to GROUP 15 - Exhaust Manifold.)l Timing Belt(Referto P.l I-26.)
10 Nm3Nm
2.2 klbs.P
~~(Refer to GROUP 13 - Engrne Control.)
10 Nm7 ft.lbs.
7 ft.lbs.\
.- .-.../A- Q/-s+: 11 ft.lbs.
120-nng
‘3, ;
%
;;
Water01 LO21
7
i2o-IjONmY rt.lDS.
87
- 94 ft.lbs.
76 - 83 ft.lbs.d
fl (Turbo)i20-130 Nm87 - 94 ftlbs.(Non-turbo)105-115Nm76 - 83 ft.lbs.Removal steps
I. Pipe assembly
2. Blow-by hose
90
Nm3. Center cover (Front bank)
4. Spark plug cable
HI 5. Rocker cover4* l a
I
6. Intake camshaft sprocket7. Timing belt rear cover (Cent
7.----A//OlFOO218. Ignition coil9. Connection of heater hose10. Connection of water hoses
Rocker coverIOmm
410mm(.4 in.)1.4 in.)
OlA004;
Sealant: 3M ATD Part
No. 8660 or equivalent
.er)
tl-urbo>11. Connection of radiator hose
12. Thermostat housing
13. Connection of water inlet pipe** l + 14. Cylinder head assembly** 15. Cylinder head gasket
(Front bank)TSB Revision

11-26ENGINE - Timing Belt
TIMING BELT
REMOVAL AND INSTALLATION
MllKA-BI
Pre-removal Operationl Removal of the Under Cover (Front L.H.,side L.H.)l Removal of Front Under Cover Panel(Refer to GROUP 51 -Aero Parts,)l Removal of Cruise Control Pump andLink Assembly(Refer to GROUP 13 -Cruise Control.)l Removal of Alternator Assembly(Referto GROUP 16-Alternator.)
l Raise and Suspend the Engine to the ExtentForce is not Applied to the Engine Mounti LIOO-
120 Nm72 - 87 ft.lbs.
35 Nm25 ft.l$.
TurbochargerOSFOO03
lo-12Nm7 - 9 ft.lbs.
Removal steps
1. Air hose
11 31 ftlbs.
‘5IO-12Nm
B;p 49ftJbs.
\
180- 190 Nm130 - 137 ft.lbs.
2. Air pipe
3. Tensioner assembly
4. Drive belt (power steering)
(RefertoP.ll-11.)4** I)* 5. Crankshaft pulley’6. Brake fluid level sensor
7. Timing belt upper cover
8. Engine mount bracket
9. Idler pulley (alternator
/ air conditioner)+* l * 10. Engine support bracketl * 11. Timing belt lower coverl * lAdjustment of timing belt tensionl * l a 12. Timing beltl * 13. Auto tensionerNm
[email protected].
Post-installation Operation
l Installation of Alternator Assembly(Refer to GROUP 16 -Alternator.)
l Installation of the Under Cover(Front L.H., Side L.H.)l Installation of Front Under Cover Panel
l Installation of Cruise Control Actuator(Refer to GROUP 13 - Cruise Control.)l Adjustment of theEngine (Refer to P.l l-1 1.)n7 m-m
M D998754nSERVICE POINTS OF REMOVAL
5. REMOVAL OF CRANKSHAFT PULLEYMllKBEF
,Using special tools, remove the crankshaft pulley from the
crankshaft.
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CautionUse only the specified special tools, or a damaged
pulley damper could result.
,
LJ