wheel torque MITSUBISHI 3000GT 1991 Owner's Guide

35-58SERVICE BRAKES - Service Adjustment Procedures
POINTS IN WAVEFORM MEASUREMENT
Symptom
Too small or zero waveform
amplitudeProbable causes
Faulty wheel speed sensorRemedy
Replace sensor
Incorrect pole piece-to-rotor clearance
Adjust clearance
Waveform amplitude fluctuates
excessively (this is no problem ifAxle hub eccentric or with large runout
Replace hub
the minimum amplitude is
100 mV
or more)
Noisy or disturbed waveformOpen circuit in sensor
Open circuit in harness
Incorrectly mounted wheel speed sensor
Rotor with missing or damaged teethReplace sensor
Correct harness
Mount correctly
Replace rotor
NOTEThe wheel speed sensor cable moves following motion of the front or rear suspension. Therefore, it is likely that it has an
open circuit only when driving on rough roads and it functions normally on ordinary roads. It is, therefore, recommended
to observe sensor output voltage waveform also under special conditions, such as rough road driving,
(ME!991 377)12FOO5i
INSPECTION OF HYDRAULIC UNITINSPECTION BY FEEL
(I) Jack up the vehicle and support the vehicle with rigid racks
placed at the specified jack-up points.
(2) Release the parking brake and determine the drag force
(drag torque) of each wheel by feel.
LJ(3) Set the MUT through the adapter harness (MB991377) as
illustrated.
(4) After confirming that the shift lever or selector lever is in
the neutral position, start the engine.
The ABS warning light lights up, it goes into the MUT mode.
In the MUT mode, ABS does not function.
(5) Operate the MUT to force the actuator to operate (item No.
04, 05, 06).
(6) Turning the wheel manually, check the change of the
braking force when the brake pedal is depressed.
The change should be as shown in the following illustration.
NOTEWhile the ABS is in the fail safe mode, the MUT actuator
test cannot be made.
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35-74
SERVICE BRAKES - Front Disc Brake
INSPECTIONM35LCAEl Check disc for wear. (Refer to
P.35-52.)l Check disc for runout. (Refer to
P.35-52, 53.)Il Check disc for damage.14A040C
(2) After installing the caliper support to the knuckle,
expand the piston, and then install the caliper body.
(3) Check brake drag torque as follows.@ Start engine and hold brake pedal down for 5
seconds. [Approx. 200 N (44
Ibs.)]@ Stop engine.@ Turn brake disc forward
10 times.@ Check brake drag torque with spring scale.
If the difference between brake drag torque and hub
torque exceeds the standard value, disassemble piston
and clean the piston. Check for corrosion or worn piston
\\
seal.l/iStandard value: 70 N (15.4 Ibs.)
[4 Nm (3 ft.lbs.)l or14A033E
less
SERVICE POINTS OF lNS?ALLATlONM35LDDA2. INSTALLATION OF FRONT BRAKE ASSEMBLY
(1) Measure hub torque with pad removed to measure
brake drag torque after pad installation.
NOTESecure the disc to the hub with wheel nuts.
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SERVICE BRAKES - Wheel SDeed Sensor lABSI35-91
/
i
lARnlA6
14N012‘
3
(3) zue$ the speed sensor cable for open circuit and replace if
NOTERemove the cable clamp from the body and, while flexing
the cable near the clamp, check for temporary open circuit.
Also check connector connection and terminal insertion.
INSPECTION OF ROTORCheck the rotor for missing or worn teeth and replace if faulty.
SERVICE POINTS OF INSTALLATIONM350DAC8. INSTALLATION OF REAR SPEED SENSOR
Insert a feeler gauge between the speed sensor pole piece
and the rotor tooth surface and tighten the speed sensor to
specified torque where the clearance is as specified all
around.Standard value: 0.2
- 0.7 mm (.008 - .028 in.)
NOTEThe rear speed sensor pole piece-to-rotor tooth surface
clearance is not adjustable in the case of AWD vehicles. In
this case, measure the sensor mounting surface-to-rotor
tooth surface clearance.
Standard value: 28.15
- 28.45 mm (1.11 - 1.12 in.)
4. INSTALLATION OF FRONT SPEED SENSOR BRACKET
NOTE
(I) The right and left speed sensor brackets differ in shape.
Install correctly referring to the identification symbols.
FR: For front speed sensor
R:For right wheel
L:For left wheel
(2) After installation of the speed sensor to the bracket,
check that the letters “FR” are visible.
3. INSTALLATION OF FRONT SPEED SENSOR
Caution
Handle the speed sensor carefully so as not to strike the
tip of the pole piece or the rotor teeth against any metalparts and damage them.
Insert a feeler gauge between the speed sensor pole piece
and rotor tooth surface and tighten the speed sensor to
specified torque where the clearance is as specified all
around.Standard value: 0.3
- 0.9 mm (.012 - .035 in.)
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37A-1
STEERING
CONTENTSM37AA-A
POWER STEERING GEAR BOX*....................17Steering Wheel Return to Center
Check................................................................8
POWER STEERING HOSES................................32Tie Rod End Ball Joint Startinq Torque
POWER STEERING OIL PUMP. .._....................28Check. . . . . . . . .._.............................. r . . . . . . . . ..I . . . . . .6Tie Rod End Ball Joint Variation Check
SERVICE ADJUSTMENT PROCEDURES5(Shaft direction)................................................5........
Bleeding............................................................10V-Belt Tension Check........................................8
Fluid Level Check............................................9SPECIAL TOOLS....................................................3Fluid Replacement
............................................9
/
bOil Pressure Switch Check
SPECIFICATIONS2............................12................................................Oil Pump Pressure Test
....................................1 1General Specifications....................................2Stationary Steering Effort Check
....................8Lubricants............................................................3Steering Angle Check
5Sealant and Adhesives....................................3........................................Steering Wheel Centering
6Service Specifications....................................2................................Steering Wheel Free Play Check
....................5STEERING WHEEL AND SHAFT*....................13
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
(1)A Supplemental Restraint System (SRS), which uses a driver-side air bag, has been installed in the 3000GT.(2)The SRS includes the following components: impact sensors, SRS diagnosis unit: SRS warning light, air bagmodule, clock spring, interconnecting wiring. Other SRS-related components (that may have to be
removed/installed in connection with SRS service or maintenance) are indicated in the table of contents byan asterisk (*).
WARNING!(I)Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to
personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver (from
rendering the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an
authorized MITSUBISHI dealer.(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B
-Supplemental Restraint System (SRS), before beginning any service or maintenance of any component of theSRS or any SRS-related component.

37A-2SPECIFICATIONS
STEERING - Specifications
GENERAL SPECIFICATIONS
M37CA-A
LA,Items
Steering wheel
Steering wheel O.D.
mm (in.)
Gear box
Steering gear type
Power steering oil pump
Oil pump type
Displacementcm3/rev. (cu.in./rev.)
Relief set pressureMPa (psi)
Specifications
390 (15.4)
Rack and pinion
Vane type
9.6 t.59)
8(1,138)
SERVICE SPECIFICATIONSM37CB-A
!msSpecifications
andard value
Steering wheel free play (with engine stopped)
mm (in.)11 (43)
Steering angle
Inner wheel33”45’ 2 2”
Outer wheel28”21’
Tie rod end ball joint starting torqueNm (in.lbs.)
FWD0.5 - 3.0 (4 - 26)
AWDl.O-3.0(9-26)
Stationary steering effortN (Ibs.)35 (8) or less
V-belt deflectionmm (in.)
When belt tension is inspected or readjusted9-11 (.35-.43)
When new belt is installed7 - 8.5 (.28 - .33)
Oil pump pressureMPa (psi)
Pressure gauge valve closed7.5-8.2 (1,067- 1,166)
Pressure gauge valve opened0.8-1.0(114-142)
Oil pressure switch operating pressureMPa (psi)
Oil pressure switch contacts closed (continuity)
1.5-2.0(213-284)
Oil pressure switch contacts opened (no continuity)0.7-1.2(100-171)
Total pinion torqueNm (in.lbs.)0.6-1.3(5-11)
Tie-rod joint swing resistanceN (Ibs.)8-18(1.8-4.0)
Tie-rod joint swing torqueNm (in.lbs.)2-5(17-43)nit
Steering wheel free play (when hydraulic operation)mm (in.) 30 (1.2)
Variation of tie rod end ball joint shaft direction
mm (in.)1.5 i.059)
Oil pump pressure
Pressure gauge valve opened
MPa (psi)1.5 (213)
Space between vane and rotormm (in.)0.06 (0024)
LJ’
I
I
L’l
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STEERING 2 Service Adjustment Procedures37A-5
13FOOOi13FOOO3SERVICE ADJUSTMENT PROCEDURES
STEERING WHEEL FREE PLAY CHECKM37FABI
1.With engine running (hydraulic operation), set front wheels
straight ahead.
2. Measure the play on steering wheel circumference before
wheels start to move when slightly moving steering wheel
in both directions.
Limit: 30 mm (1.2 in.)
3:When the play exceeds the limit, check for play on steering
shaft connection and steering linkage. Correct or replace.
4. If the free play still exceeds the limit value set steering
wheel straight ahead with engine stopped. Load 5 N
(1 lb.)
towards steering wheel circumference and check play.
Standard values (steering wheel play with engine
stopped): 11 mm
(.43 in.)
If the play exceeds the standard value, remove steering
gear box and check total pinion torque.
STEERING ANGLE CHECKM37FDBK1. Set front wheels on turning radius gauge and measure
steering angle.
Standard values:Inner wheel
33”45’ k 2”
Outer wheel
28”21’2. When not within the standard value, it is probably a toe
problem. Adjust toe (refer to GROUP 33A
- Service
Adjustment Procedures) and recheck.
TIE ROD END BALL JOINT VARIATION CHECK
(SHAFT DIRECTION)M37FPAF1. Hold the ball joint with pliers.
2.Set a caliper gauge as illustrated and measure the displace-
ment with the ball stud compressed.
Limit: 1.5 mm
(.059 in.)
3. If the measured displacement exceeds the limit, replace
the tie-rod end.
Caution
Even if the variation is within the limit, check ball jointstarting torque.
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STEERING - Service Adjustment Procedures13G005E
Tape or markon steering
wheel hub
13FOO4:
Lines atstraight-position-ahead
Dotted linesshow wheel
at desired
positlon
Tape or mark
on
steenngwheel rim
tanceRuler 7’off-center13FOO4;
36 splines
13W589/13FOO45
TIE ROD END. BALL JOINT STARTING TORQUE
CHECK~M37FEBF
1. Disconnect tie rod and knuckle with special tool.~
LJ2. Move ball joint stud several times and install nut on stud.
Measure ball joint starting torque.
Standard value:
0.5 - 3.0 Nm (4 - 26 in.lbs.1
1.0 - 3.0 Nm (9 - 26 in.lbs.)3. When starting torque exceeds the standard value, replace
tie rod end.
4.When the starting torque is under the standard value, check
for play or ratcheting in ball joint.
If none of these, it is still
serviceable.
STEERING WHEEL CENTERINGM37FNAI
SIMPLIFIED STEERING WHEEL CENTERINGDetermining Steering Wheel’s Off Center
1. For the road test, take along chalk or tape and a ruler.
2. Drive straight ahead on an uncambered level surface.
3. When the vehicle’s wheels are pointing straight ahead,
mark the steering wheel hub and column cover with a chalk
or tape line.
4. Stop the vehicle and line up the marks on the hub and
column cover.
5. Place a tape strip
01 mark on the steering wheel rim.
6.Hold a ruler next to the rim as shown in the illustration, and
then steer the steering wheel until it is in the desired
centered position.
7.Record the distance the strip or mark on the rim has moved.
This is how far the steering wheel is off center. If it is more
than 16 mm
(518 in.) off center, it can be centered by
indexing it ten degrees towards the center.
Indexing Steering Wheel to Center It
The steering wheel shaft has 36 splines, allowing the steering
wheel to be indexed in ten-degree increments.
1. Remove the steering wheel.
2.Without disturbing the position of the steering wheel shaft,
re-install the wheel as near on-center as possible.
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STEERING - Service Adjustment Procedures37A-7
L
i
13FOO46
Steering wheel off center left
13K11l13FOO48
Offcenter to leftOff center to left
Off center to rightOff center to right
Turn both tie rods in the same direction.13R055E
PRECISION STEERING WHEEL CENTERINGIn general, the tie rods are adjusted to steer the front wheels in
the same direction that the steering wheel is off center. If the
steering wheel is off center to the left, center it by adjusting the
tie rods to make the front wheels steer toward the left, and vice
versa.
1. Mark the tie rods and tie rod ends with chalk before
loosening the lock nuts.
2. Hold the tie rod with a wrench and loosen the lock nut.
3.Hold the tie rod end with a wrench and turn the tie rod the
desired number of turns.
For 2” or 6 mm
(.25 in.) at the steering wheel rim l/5turn of tie rods
4. Tighten the lock nut to specified torque, taking care not to
turn the tie rod.
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STEERING - Service Adjustment Procedures37A-11
Shut-off valve
Pressure gauge(FuW dose)
Temperature
Shut-off valve
OIL PUMP PRESSURE TESTM37FLAl-l
CHECKING THE OIL PUMP RELIEF PRESSURE
1.Disconnect the pressure hose from the oil pump, and then
connect the special tools.
2. Bleed the air, and then turn the steering wheel several
times while the vehicle is not moving so that the tempera-
ture of the fluid rises to approximately 50
- 60°C (122 -
140°F).3. Start the engine and idle it at 1,000
+ 100 rpm.
4. Fully close the shut-off valve of the pressure gauge and
measure the oil pump relief pressure to confirm that it is
within the standard value range.
Standard value: 7.5
- 8.2 MPa (1,067 - 1,166 psi)
Caution
Pressure gauge shut off valve must not remain closedfor more than 10 seconds.
5.If it is not within the standard value, overhaul the oil pump.
6. Remove the special tools, and then tighten the pressure
hose to the specified torque.
7. Bleed the system.
CHECKING THE PRESSURE UNDER NO-LOAD CONDI-
TIONS
1.
2.
3.
4.
5.
6.
7.Disconnect the pressure hose from the oil pump, and then
connect the special tool.
Bleed the air, and then turn the steering wheel several
times while the vehicle is not moving so that the tempera-
ture of the fluid rises to approximately 50
- 60°C (122 -
140°F).Start the engine and idle it at 1,000
+ 100 rpm.
Check whether or not the hydraulic pressure is the standard
value when no-load conditions are created by fully opening
the shut-off valve of the pressure gauge.
Standard value: 0.8
- 1.0 MPa (114 - 142 psi)
Limit: 1.5
MPa (213 psi)
If it is not within the standard value, the probable cause is a
malfunction of the oil line or steering gear box, so check
these parts and repair as necessary.
Remove the special tools, and then tighten the pressure
hose to the specified torque.
Bleed the system.
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37A-12STEERING - Service Adjustment Procedures
Shut-off valvePressure gaugeTemperature (MB990662-01)(Fully open)I
13AO146
-01)
Shut-off
Adapter
Pressure gaugevalve
(MB990993-01)(MB990662-01) /
\Temperature
1310148
-01)
CHECKING THE STEERING GEAR RETENTION HYDRAULIC
PRESSURE
1.
2.
3.
4.
5.
6.
7.
8.Disconnect the pressure hose from the oil pump, and then
/connect the special tools.
Bleed the air, and then turn the steering wheel several
‘dtimes while the vehicle is not moving so that the tempera-
ture of the fluid rises to approximately 50
- 60°C (122 -
140°F).Start the engine and idle it at 1,000
& 100 rpm.
Fully close and fully open the shut-off valve of the pressure
gauge.Turn the steering wheel all the way to the left or right; then
check whether or not the retention hydraulic pressure is the
standard value.
Standard value: 7.5
- 8.2 MPa (1,067 - 1,166 psi)
When not within the standard value, overhaul the steering
gear box.
Remeasure fluid pressure.
Remove the special tools, and then tighten the pressure
hose to the specified torque.
Bleed the system.
OIL PRESSURE SWITCH CHECKM37FUAC
1.
2.
3.
4.
5.
6.
7.
8.Disconnect the pressure hose from the oil pump, and then
connect the special tools.
Bleed the air, and then turn the steering wheel several
times while the vehicle is not moving so that the tempera-
ture of the fluid rises to approximately 50
- 60°C (122 -
140°F).dThe engine should be idling.
Disconnect the connector for the oil pressure switch, and
place an ohmmeter in position.
Gradually close the shut-off valve of the pressure gauge and
increase the hydraulic pressure then check whether or not
the hydraulic pressure that activates the switch is the
standard value.
Standard value: 1.5
- 2.0 MPa (213 - 284 psi)
Gradually open the shut-off valve and reduce the hydraulic
pressure; then check whether the hydraulic pressure that
deactivates the switch is the standard value.
Standard value: 0.7
- 1.2 MPa (100 - 171 psi)
Remove the special tools, and then tighten the pressure
hose to the specified torque.
Bleed the system.
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