MITSUBISHI 3000GT 1991 Service Manual

COOLING - Service Adiustment Procedures.14-7
SERVICE ADJUSTMENT PROCEDURES
ENGINE COOLANT LEAK CHECKMl4FAAF
1. Loosen cap.
2.Confirm that the engine coolant level is up to the filler neck.
3.Install an adapter to the water outlet fitting and apply 160
kPa (23 psi) pressure. Hold pressure for two minutes, while
checking for leakage from the radiator, hose or connec-
tions.
CautionBe sure to completely clean away any moisture from
the places checked.
When the tester is removed, be careful not to spill anyengine coolant from it.
Be careful, when installing and removing the tester andwhen testing, not to deform the water outlet fitting.
4. If there is leakage, repair or replace the appropriate part.
CAP PRESSURE TESTM14FBAH1. Use a special tool to attach the cap to the tester.
2.Increase the pressure until the indicator of the gauge stops
moving.
Limit: 65
kPa (9.2 psi)
Standard value: 75
- 105 kPa (11 - 15 psi)
3:Replace the cap if the reading does not remain at or above
the limit.
NOTEBe sure that the cap is clean before testing, since rust or
other foreign material on the cap seal will cause an
improper indication.
ENGINE COOLANT REPLACEMENTM14FCAGRefer to GROUP 00
- Maintenance Service.
ENGINE COOLANT CONCENTRATION TEST
M14FDALRefer to GROUP 00
- Selection of Coolant.
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14-8COOLING - Radiator
RADIATOR
REMOVAL AND INSTALLATIONM14QA..
Removal steps of radiator
1. Drain plug2. Cap3. Overflow tube
4. Water level sensor connector
5. Reserve tank
6. Radiator upper hose
7. Radiator lower hose
8. Automatic transaxle oil cooler hoses
9. Condenser fan motor connector
10. Condenser fan motor assembly

** 11. Radiator fan motor connector
12. Connection of therm0 sensor(For radiator fan)13. Connection of therm0 sensor(For condenser fan)
14. Radiator fan motor assembly
15. Upper insulator
16. Radiator assembly
17. Lower insulator
Removal steps of radiator fan motor assembly
1. Drain plug2. Cap
6. Radiator upper hose
9. Condenser fan motor connector

10. Condenser fan motor assembly

l * 11. Radiator fan motor connector12. Connection of therm0 sensor(For radiator fan)13. Connection of therm0 sensor
18.
Therm0 sensor (For radiator fan)
19. Therm0 sensor (For condenser fan)
(For condenser fan)
20. Fan
14. Radiator fan motor assembly20. Fan
21. Radiator fan motor21. Radiator fan motor
22. Resistor22. Resistor
23. Shroud23. Shroud
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COOLING - Radiator14-S
- 04N0002
SERVICE POINT OF REMOVALM14QBAK8. DISCONNECTION OF AUTOMATIC TRANSAXLE OIL
COOLER HOSESUse a plug or otherwise cover the hose and nipple part of
the radiator so that dust, dirt, foreign materials, etc. do not
enter after the hose has been disconnected from the
radiator.
INSPECTIONM14QCAN
l Check for foreign material between radiator fins.
l Check the radiator fins for bent, or damage.
l Check the radiator for corrosion, damage rust or scale.
lCheck the radiator hoses for cracks, damage or deteriora-
tion.
l Check the reserve tank for damage.
lCheck the automatic transaxle oil cooler hoses for cracking,
damage or deterioration.
RADIATOR FAN MOTOR INSPECTION
(1) Check to be sure that the radiator fan rotates when battery
voltage is applied between terminals (as shown in the
figure).(2) Check to see that abnormal noises are not produced, while
motor is turning.
INSPECTION OF RESISTOR(1) Measure the resistance between connector terminals @
and @ of the radiator fan motor.
(2) The resistor is normal if the resistance is within the
following range.
Resistance: 0.29
- 0.35 IZ
THERM0 SENSOR INSPECTION
(1) Immerse the water temperature switch in hot water as
shown.
(2) Change the water temperature and check continuity with a
circuit tester.. If it is as specified below, the switch is
functioning correctly.
Item
With continuityb;F;;ature of
Without continuity
(t;,n-r3;rature ofFor condenser fanFor radiator fan91
- 99°C81 - 89°C(196 - 210°F)(178 - 192°F)87°C (189°F)
’77°C (I 71 “F)
or lessor less
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14-10COOLING - Radiator
r-----I
113
EY
4 :
2 :
i.-.-..i
0312161908
Ionnector04FOOO8
RADIATOR FAN MOTOR RELAY INSPECTION
(1) Remove radiator fan motor relay from the relay box located
at the right side in the engine compartment.
Ll(2) Check for continuity between the terminals when the
battery power-supply is applied to terminal
0, and terminal@ is grounded.
When current
flowsBetweenterminals 1
- 3Continuity
When nocurrent flowsBetweenterminals 1 - 3No continuity
Betweenterminals 2 - 4Continuity
SERVICE POINT OF INSTALLATIONM14QDAH
11. CONNECTION OF RADIATOR FAN MOTOR CONNEC-
TORConnect the radiator fan motor connector to the body
harness. Then, insert into the shroud hole and fix securely.
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COOLING - Thermostat14-11
THERMOSTATMlbGB- -
iREMOVAL AND INSTALLATION
L
Pre-removal and Post-installation
l Draining and Supplying of the
(Refer to GROUP 00
- Maintenance
Removal steps
1. Air hose A +a2. Air intake hose A
3. Air intake hose
4. Connection of radiator lower hose
5. Water inlet fitting
6. Gasketl a 7. Thermostat
OlFOO37
7cooo43l
Fullyclosed j
04N0004
INSPECTIONM14GDALl Check that valve closes tightly at room temperature.
l Check for defects or damage.
l Check for rust or encrustation on valve. Remove if any.
l Immerse thermostat in container of water. Stir to raise
water temperature and check that thermostat opening
valve temperature and the temperature with valve fully
open [valve lift-over
10 mm (39 in.)] are at the standard
value.
Standard value:
Opening valve temperature
Full-open temperature
NOTE76.5%
(‘170°F)
90°C ( 194°F)Measure valve height when fully closed. Calculate lift by
measuring the height when fully open.
-
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14-12COOLING - Thermostat
Air intake hose B
05FOO23
,
SERVICE POINTS OF INSTALLATIONM14GEAI7. INSTALLATION OF THERMOSTAT
Install the thermostat with its jiggle valve lined up with the ,
”mark on the thermostat housing.LJ2. INSTALLATION OF AIR INTAKE HOSE A
Assemble the air intake hose A with its notches (arrow-
marked) lined up with the
L marks on the air intake hoses
B and C. Insert the hoses into the air intake hose A until
they are bottomed.
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COOLING - Water Pump, Water Pipe and Water Hose
WATER PUMP, WATER PIPE AND WATER HOSE
14-13
M14MB-B
/REMOVAL AND INSTALLATION
Pre-removal and Post-installation
Operation
l Draining and Supplying of the Engine Coolant
(Refer to GROUP 00 - Maintenance Service.)l Removal and Installation of Power Transistor
Unit and Ignition Coil
(Refer to GROUP 16 - Engine Electrical)l Removal and lnstallatlon of Timing Belt
(Refer to GROUP 11 -Timing Belt)17-20 Nm17-20 Nm
12-14ft.lbs.
1
12-15Nm9-11 ft.1bs.q
Removal steps
1. Water pump
2. Gasket
3. Air hose A
4. Air intake hose A
5. Air intake hose B
6. Air intake hose C
7. Air intake hose
8. Connection of radiator upper hose
9. Connection of water hose
IO. Water outlet fitting11. Gasket
12. Connection of harness
13. Connection of heater hose
14. Connection of water hose A
15. Connection of water hose
16. Connection of water hose
17. Connection of radiator lower hose
18. Connection of water hose
19. Thermostat housing
20. Gasket21.
Her water pipe22. O-ringOlFOO51
Installation steps
2. Gasket** 1. Water pumpI)+ 22. O-ring
l * 21. Inlet water pipe
20. Gasket
19. Thermostat housing18. Connection of water hose 17. Connection of radiator lower hose16. Connection of water hose
15. Connection of water hose
14. Connection of water hose A
13. Connection of heater h&e
12. Connection of harness11. Gasket10. Water outlet fitting
9. Connection of water hose
8. Connection of radiator upper hose7. Air intake hose l *6. Air Intake hose C **5. Air intake hose B l *4. Air intake hose A
3. Air hose A
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COOLING - Water Pump, Water Pipe and Water Hose
INSPECTION
WATER PUMP
I
MIQMDAOZIf any of the following irregularities are observed, replace the
LJwater pump as an assembly.
(1) Damage or crack on the water pump body
(2) Water leakage. With improper sealing, a water leakage
mark may be observed around hole
@.
,
(.31 x .98)OlLO188
6COO35
Air intake hose BOSFOO23
SERVICE POINTS OF INSTALLATION
1. INSTALLATION OF WATER PUMPM14MEAW
(1) Clean both gasket surfaces of water pump body and
cylinder block.
(2) Install new water pump gasket and water pump
assembly and tighten the bolts.
(3) Water pump installation bolt size are different and
caution must be paid to ensure that they are properly
installed.
22. INSTALLATION OF O-RING / 21. INLET WATER PIPEReplace the O-rings at both ends of the water inlet pipe
with new ones and apply water to the outside of O-rings to
help smooth insertion of the pipe into the water pump,.
thermostat housing.
CautionLJCare must be taken not to permit engine oil or
othergreases to adhere to the O-ring.
6.INSTALLATION OF AIR INTAKE HOSE C / 5. AIR INTAKEHOSE B
/ 4. AIR INTAKE HOSE A
Assemble the air intake hose A with its notches (arrow-
marked) lined up with the
D marks on the air intake hoses
B and C. Insert the hoses into the air intake hose A until
they are bottomed.
Insert the air intake hoses B and C on the turbocharger side
until they are bottomed.
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COOLINGEngine Coolant Temperature Gauge Unit, Engine Coolant- Temperature Sensor and Engine Coolant Temperature Switch14-15
ENGINE COOLANT TEMPERATURE GAUGE UNIT, ENGINE COOLANT
TEMPERATURE SENSOR AND ENGINE COOLANT TEMPERATURE
L,SWITCH
REMOVAL AND INSTALLATIONM140B. -Pre-removal and Post-installation
Operation
l Draining and Supplying of theEngine Coolant(Refer to GROUP 00 - MaintenanceService.)
30 NmOlFOO38
Removal steps
1. Air hose A l +2. Air intake hose A IF*3. Air intake hose B
4. Connection of radiator upper hose
5. Engine coolant temperature gauge unit
6. Engine coolant temperature sensor
(Engine control)7. Engine coolant temperature switch(Air conditioner)
INSPECTIONM140DAM
ENGINE COOLANT TEMPERATURE GAUGE UNITRefer to GROUP 54
- Meters and Gauges.
ENGINE COOLANT TEMPERATURE SENSOR (Engine con-
trol)Refer to GROUP 13
- MPI System Inspection.
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14-16
I
COOLINGEngine Coolant Temperature Gauge Unit, Engine Coolant- Temperature Sensor and Engine Coolant Temperature SwitchI
Air Intake hose B
05FOO2:
ENGINE COOLANT TEMPERATURE SWITCH (Air condition-I
4
(1) Immerse the engine coolant temperature switch in oil and
then heat (by using a gas stove flame or similar method) so
as to increase the oil temperature.
L.2~(2) Check to be sure that the engine coolant temperature
switch is switched OFF when the oil temperature reaches
the standard value.
Standard value: 112
- 118°C (234 - 244°F)
Caution
The oil used above should be engine oil and should be
stirred well while being heated; do not heat more than
necessary.
SERVICE POINTS OF INSTALLATIONM140EAz
3.INSTALLATION OF AIR INTAKE HOSE B / 2. AIR INTAKE
HOSE AB and L. Assemble the air intake hose A with its notches (arrow-
marked) lined up with the
n marks on the air intake hoses
. -dInsert the hoses Into the air intake hose A until they are
bottomed.
Insert the air intake hose B on the turbocharger side until
they are bottomed.
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