1991 MITSUBISHI 3000GT clutch

00-20GENERAL - Special Handling Instructions for AWD Models
14A019fOOPOO38
BalancingmachineOOA0046
Pick-up stand
OOA0024
I
FRONT WHEEL MEASUREMENTS1. Place the front wheels on the brake tester.
2. Perform the brake test.
CautionThe rear wheels should remain on the ground.
3.If the brake dragging force exceeds the specified value, jack
up the vehicle and manually rotate each wheel to check the
rotation condition of each wheel.
NOTEIf the brake dragging force exceeds the specified value, the
cause may be the effect of the viscous coupling’s dragging
force, so jack up the front wheels and check the rotation
condition of the wheels in this state for no effect by the
viscous coupling’s dragging force.
REAR WHEEL MEASUREMENTSAfter placing the rear wheels on the brake tester, follow the
same procedures as for the front wheel measurements.
WHEEL BALANCE
FRONT WHEEL MEASUREMENTS‘d
1. Jack up the rear wheels, and place an axle stand at the
designated part of the side sill.
2. Jack up the front wheels and set a pick-up stand and
balancing machine in place.
Caution
1.Set so that the front and rear of the vehicle are at
the same height.
2. Release the parking brake.
3. Rotate each wheel manually and check to be sure
that there is no dragging.
3. Use the engine to drive the tires, and then make the
measurements.
Caution
1.If an error is indicated in the state of engine drive,
motor drive can be used concurrently.
2. Do not operate the clutch suddenly, or increase or
reduce speed suddenly during the work.
REAR WHEEL MEASUREMENTS1. Jack up the front wheels, and place an axle stand at the
designated part of the side sill.
2. Jack up the rear wheels, and then, after setting a pick-up
stand and balancing machine in place; follow the same
procedure as for front wheel measurements.
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TSB RevisionSPECIAL HANDLING INSTRUCTIONS
FOR AWD MODELSMOOUAACBRAKE TEST
‘dIn order to stabilize the viscous coupling’s dragging force, the
brake test should always be conducted after the speedometer
test.

GENERAL - Maintenance Service00-37
3. AIR CLEANER ELEMENT (Replace)
MOOSAKHThe air cleaner element will become dirty and loaded with dust
during use, and the filtering effect will be substantially reduced.
Replace it with a new one.

(1) Disconnect the air-flow sensor connector.
(2) Remove the air intake hose from the air-flow sensor.
(3) Unclamp the air cleaner cover.
(4) Remove the air cleaner cover and air-flow sensor.
CautionRemove the air cleaner cover with care not to give
shock to the air-flow sensor.
(5) Take out the air cleaner element.

(1) Remove the clutch booster vacuum pipe mounting bolt.
(2) Disconnect the air-flow sensor connector.
(3) Remove air intake hose A from the air-flow sensor.
(4) Unclamp the air cleaner cover.
(5) Remove the air cleaner cover and air-flow sensor.
CautionRemove the air cleaner cover with care not to give
shock to the air-flow sensor.
(6) Take out the air cleaner element.
4. SPARK PLUGS (Replace)
MOOSAOIThe spark plugs must fire properly to assure proper engine
performance and emission-control.
Therefore, they should be replaced periodically with new ones.
Spark plug
NGKPFRGJ-1 1
NIPPON DENS0
PK20PR-PI 1Spark plug gap: 1.0
- 1.1 mm LO39 - -043 in.)
NOTEFor the platinum plug, use care not to damage the platinum tip.
Specified torque: 25 Nm (15
ft.lbs.15. TIMING BELT (Replace)
MOOSBADReplace the belt with a new one periodically to assure proper
engine performance.
For removal and installation procedures, refer to GROUP 11
-Timing Belt.
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00-40
GENERAL - Maintenance Service
(2) Check that the transaxle oil level is at the lower portion of
the filler plug hole. For AWD-vehicles, check that the
transfer oil level is at the portion shown in the illustration.
(3) Check to be sure that the transmission oil is not noticeably
‘ddirty, and that it has a suitable viscosity.
10. AUTOMATIC TRANSAXLE
(Inspect fluid level)
MOOSEDL
1.Drive until the fluid temperature reaches the usual tempera-
ture
[70 - 80°C (160 - 18O”F)I.2. Place vehicle on level floor.
3. Move selector lever sequentially to every position to fill
torque converter and hydraulic circuit with fluid, then place
lever in “N” Neutral position. This operation is necessary to
be sure that fluid level check is accurate.
4. Before removing dipstick, wipe all dirt from area around
dipstick. Then take out the dipstick and check the condition
of the fluid.
The transaxle should be overhauled under the following
conditions.
l If there is a “burning” odor.
l If the fluid color has become noticeably blacker.
lIf there is a noticeably great amount of metal particles in
the fluid.
5. Check to see if fluid level is in “HOT” range on dipstick. If
fluid level is low, add ATF until level reaches “HOT” range.
Low fluid level can cause a variety of conditions because it
allows pump to take in air along with fluid. Air trapped in
hydraulic circuit forms bubbles which make fluid spongy.
Therefore, pressures will be erratic.
Improper filling can also raise fluid level too high. When
transaxle has too much fluid, gears churn up foam and
cause same conditions which occur with low fluid level,
resulting in accelerated deterioration of ATF transmission
fluid.
In either case, air bubbles can cause overheating, fluid
oxidation, which can interfere with normal valve, clutch, and
servo operation. Foaming can also result in fluid escaping
from transaxle vent where it may be mistaken for a leak.
6. Be sure to examine fluid on dipstick closely.
L/(Change fluid)
Drain the fluid and check whether there is any evidence of
contamination.
Replenish with new fluid after the cause of any contamination
has been corrected.
(1) Remove drain plug at transaxle case bottom to let fluid
drain.(2) Place a drain container with large opening under the
transaxle oil pan.
(3) Loosen oil pan bolts and tap pan at one corner to break it
loose allowing fluid to drain, then remove oil pan.
d
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II-50ENGINE - Crankshaft, FlYwheel and Drive Plate
\7EN262
7EN261INSPECTION
MllUCHAFLYWHEEL (engine with a manual transaxle)
(I) Make a visual inspection of the clutch disc. If stepped wear, :streaking, or seizure are apparent, replace it.\J(2) If flywheel run out exceeds the limit, replace it.
Limit: 0.13 mm
t.0051 in.)
RING GEAR (engine with a manual transaxle)
When there is wear, cracks, or other damage to the ring gear
teeth, replace the ring gear by the following procedure. Check
the starter motor pinion.
Ring gear replacement procedure:
(1) Tap around the ring gear to loosen and remove it from the
flywheel..
CautionThe ring gear cannot be removed while it is hot.
(2) Heat the ring gear to 300°C (572°F) and install it into the
flywheel.
CRANKSHAFTInspect out-of-roundness and taper of crankshaft journal and
pin.
Limit:Out-of-roundness of journal and pin:
LJ
0.003 mm (.00012 in.)Taper of journal and pin: 0.005 mm
(.00020 in.)
OIL CLEARANCE MEASUREMENT
(I) To check the oil clearance, measure the outside diameter of
the crankshaft journal and the crank pin and the inside
diameter of the bearing. The clearance can be obtained by
calculating the difference between the measured outside
and inside diameters.
Standard value: 0.019
- 0.044 mm i.0007 - .0017 in.)
Limit: 0.1 mm
(.004 in.)
(2) If the oil clearance exceeds the limit, replace the bearing,
and crankshaft if necessary.
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13-82FUEL SYSTEM - On-vehicle Inspection of MPI Components
AIR CONDITIONER SWITCH AND POWER RELAY
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Air conditronerAir conditioner
control unitAir conditioner
compressor lock
controllerr
Engine control unit
Dual pressureswitch
M13YRAA2
b1IFF
Air conditioner
compressor
Engine control
unit connector
7FUO966
7FUO653
OPERATION
lThe air conditioner switch applies the battery voltage to the engine control unit when the air conditioner is
turned on.
lWhen the air conditioner ON signal is input, the engine control unit drives the idle speed control servo and
turns ON the power transistor. As a result, the air conditioner power relay coil is energized to turn on therelay switch, which activates the air compressor magnetic clutch.
TROUBLESHOOTING HINTS
If the air compressor magnet clutch is not activated when the air conditioner switch is turned on during idling,faulty air conditioner control system is suspected.
INSPECTION
Using Multi-use Tester
AIR CONDITIONER SWITCH
Function1 Item No. 1 Data display 1Check condition) Air conditioner switch 1 Normal indication IData reading 28
Switch stateEngine: Idling (airOFFOFFcompressor to be running
when air conditionerONONswitch is ON)\k”JTSB Revision

FUEL SYSTEM - On-vehicle Inspection of MPI Components
AIR CONDITIONER POWER RELAY
L
FunctionItem No. Data display
Data reading49Air condi-tioner relay
stateCheck conditionEngine: Idling after
warm-up
HARNESS INSPECTIONAir conditioner switch
Normal indication
OFFOFF (compressor
clutch non-activa-
tion)
ONON (compressorclutch activation)
’ I
unit harness
side connector
7FUO695
Measure the power supply voltage of
the air conditioner circuit.l
Air conditioner switch: ONlEngine control unit connector:
Disconnectedl Ignition switch: ON
l
Dual air conditioner switch: ONVoltage
(V)IM
ASTOP
Check the airconditioner
circuit.
AIR CONDITIONER INSPECTIONRefer to GROUP 55
- Service Adjustment Procedures.
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FUEL SYSTEM - On-vehicle .lnspection of MPI Components13-111
INSPECTIONUsing Multi-use Tester
FunctionItem No. Data display
Data reading 45
Stepper
1
motor steps
~
Check condition
l Engine coolant tem-
perature: 80 to 95°C
(176 to 205°F)
0 Lamps, electric cooling
fan, accessory units:
All OFFl Transaxle: Neutral(P range for vehiclewith AA>l Steering wheel: Neutrall Idle position switch: ON(compressor clutch
to be ON if air condi-
tioner switch is ON)l Engine: idling
Load stateStandard value
;;rnditioner switch:2 - 12 stp&conditioner switch:
25 - 65 stp
l $irNconditioner switch:15 - 63 stp0 Selector lever:Shift to D range
NOTEWhen the vehicle is new [within initial operation of about 500 km (300 miles)], the stepper motor steps may be about 30steps more than standard.
CautionWhen the selector lever is shifted to the “D”range, the brakes must be used to prevent the vehicle frommovingforward.
03A020
Using Oscilloscope(1) Connect the probe to each oscilloscope pick-up point as
shown in the circuit diagram.
(2) Start the engine.
(3) When the air conditioner switch is turned on, the idling
speed increases to operate the idle speed control. Check
the instantaneous waveform.
NOTEKeep in mind that the waveform can be observed only
when idle speed control is in operation.
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13-158CRUISE CONTROL SYSTEM - Specifications
CRUISE CONTROL SYSTEM
SPECIFICATIONSLJGENERAL SPECIFICATIONS
MlOCA-.Rated load A
Voltage drop V
Auto-cruise control switchRated load A
SET
Stop light switch (for cruise control)Rated load A
Clutch switchRated load A
Vacuum pump
TypeRated load A
Control valve, release valveSERVICE SPECIFICATIONS
MlBCB- -
ItemsI Specifications
Accelerator cable playmm (in.)

Throttle cablemm (in.)
Cruise control cablemm (in.)
Resistance between terminals for control valve and reliefvalve in vacuum pumps1
O-l (O-.04)
2-3(.08-.12)
1-2 (.04-.08)
l-2(.04-.08)
50-60
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