MITSUBISHI 3000GT 1991 Service Manual

STEERING -Specifications / Special Tools37A-3
LUBRICANTSM37CD-A
L
/
b
ItemsSpecified lubricantQuantity
Power steering gear box
BearingMITSUBISHI PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
O-ringMlTSUBlSHl.PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
Oil sealMITSUBISHI PLUS ATF/Automatic trans-As required
mission fluid “DEXRON” or “DEXRON II”
Special tool (MB991 213)MITSUBISHI PLUSATFIAutomatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
Pinion and valve assemblyMITSUBISHI PLUS ATF/Automatic trans-As required
seal ring partmission fluid “DEXRON” or “DEXRON II”
BellowsSilicone greaseAs required
Power steering oil pump
Power steering fluidMITSUBISHI PLUS
ATF/Automatic trans-0.9 liter (.95 qt.)
mission fluid “DEXRON” or “DEXRON II”
Flow control valveMITSUBISHI PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
Friction surface of rotor, vane, cam ringMITSUBISHI PLUS ATF/Automatic trans-As required
and pump covermission fluid “DEXRON” or “DEXRON II”
O-ringMITSUBISHI PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
SEALANT AND ADHESIVESM37CE-A
Items
Power steering gear box
End plug screw
Power steering rack support cover screw
Dust cover
Specified sealant and adhesive
3M ART Part No. 8663 or equivalent
3M ART Part No. 8663 or equivalent
3M ART Part No. 8663 or equivalent
SPECIAL TOOLSM37DA.A
ToolNumberNameUseII
MB991 113-01Steering linkage
pullerDisconnection of tie-rod end
MB991 006-01Preload socketMeasurement of the total pinion torqueTSB Revision

37A-4STEERING - Special Tools
easuremen
MB990993-01Power steering oilpressure gauge
adapter (pump side)Measurement of oil pressure
MB991 204
Removal of rack housing needle bearingTSB Revision

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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37A-8STEERING - Service Adjustment Procedures13FOOO3
13FOOOl
STATIONARY STEERING EFFORT CHECKM37FFAM
1.With the vehicle stopped on a flat, paved surface, turn the
steering wheel to the straight ahead position.
2. Start the engine and set it to 1,000
+ 100 rpm.d
Caution
After checking the engine speed, there must be a returnto the standard idling speed.
3. Attach a spring balance to the outer circumference of the
steering wheel and measure the steering force required to
turn the steering wheel from the straight ahead position to
the left and right (within a range of 1.5 turns).
Also check to be sure that there is no significant fluctuation
of the required steering force.
Standard value:
Steering effort35 N (8 Ibs.) or less
Fluctuation allowance
6 N (1.3 Ibs.) or less
STEERING WHEEL RETURN TO CENTER CHECK
M37FGACiTo make this test, conduct a road test and check as follows.
1.Make both gradual and,sudden turns and check the steering
“feeling” to be sure that there is no difference in the
steering force required and the wheel return between left
and right turns.
2. At a speed of 35 km/h (22 mph), turn the steering wheel
90”. and release the steering wheel after 1 or 2 seconds. If
the steering wheel then returns 70” or more, the return can
be judged to the satisfactory.
NOTEThere will be a momentary feeling of “heaviness” when the
wheel is turned quickly, but this is not abnormal. (This is
because the oil pump discharge amount is especially apt to
be insufficient during idling.)
V-BELT TENSION CHECKM37FHAJCheck to be sure that the belt is not damaged and that the
V-belt is correctly attached to the groove of the pulley.
NOTEIf there is abnormal noise or belt slippage, check the belt
tension and check for unusual wear or abrasion, or damage, of
the pulley contact surface, and for scars or scratches on the
pulley.d
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STEERING - Service Adjustment Procedures37A-9
LL:13N002E
FluId f[uctuatlon
While
engineWhile engme
runningstopped13uo13:
Return ho
Vinyl hose13AO142
j
1.Press in V-belt at the illustrated position with about 100 N
(22 Ibs.) and measure deflection.
Standard value:
When belt tension is inspectedor readjusted
When new belt is installed
/ 9 - 11 mm (.35 - .43 in.)
I
’ 7 - 8.5 mm (.28 - .33 in.)
2.If the deflection is out of the standard values, adjust the belt
tension using the following procedure.
(1) Loosen the tension pulley’s securing bolts A and
B.(2) Mount the extension bar on the tension pulley.
(3) While increasing the tension of the V-belt with the
extension bar, retighten the tension pulley’s securing
bolts A and B in the order mentioned.
FLUID LEVEL CHECKM37FlAJ
1.Park the vehicle on a flat, level surface, start the engine, and
then turn the steering wheel several times to raise the
temperature of the fluid to approximately 50
- 60°C (122 -
140°F).
2.With the engine running, turn the wheel all the way to the
left and right several times.
3.Check the fluid in the oil reservoir for foaming or milkiness.
Check the difference of the fluid level when the engine is
stopped, and while it is running. If the fluid level changes
considerably, air bleeding should be done.
FLUID REPLACEMENTM37FJAL1. Raise the front wheels on a jack, and then support them
with rigid racks.
2. Disconnect the return hose connection.
3. Connect a vinyl hose to the return hose, and drain the oil
into a container.
4. Disconnect the high-tension cable, and then while operat-
ing the starting motor intermittently, turn the steering
wheel all the way to the left and right several times to drain
all of the fluid.
Caution
Be careful not to position the high-tension cable nearthe carburetor or the delivery pipe.
5.Connect the return hoses securely, and then secure it with
the clip.
6.Fill the oil reservoir with the specified fluid up to the lower
position of the filter, and then bleed the air.
Specified fluid:MITSUBISHI PLUS ATF/Automatic
transmission fluid “DEXRON” or
“DEXRON II”
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37A-10STEERING - Service Adjustment Procedures
BLEEDINGM37FKAl
1.Jack up the front wheels and support them by using a floor
stand.
2. Manually turn the oil pump pulley a few times.
3. Turn the steering wheel all the way to the left and to the
right several times.
4. Disconnect the high-tension cable, and then, while operat-
ing the starting motor intermittently, turn the steering
wheel all the way to the left and right several times (for 15
to 20 seconds).
Caution1. During air bleeding, replenish the fluid supply so
that the level never falls below the lower position ofthe filter.
2. If air bleeding is done while engine is running, the
air will be broken up and absorbed into the fluid; besure to do the bleeding only while cranking.
5. Connect the ignition cable, and then start the engine
(idling).
6.Turn the steering wheel to the left and right until there are
no air bubbles in the oil reservoir.
7.Confirm that the fluid is not milky, and that the level is up to
the specified position on the level gauge.
8. Confirm that there is very little change in the fluid level
when the steering wheel is turned left and right.
Fluid level change:wlthln 5 mm 1.2 in.)I
9.Check whether or not the change in the fluid level is within
5 mm
(.2 in.) when the engine is stopped and when it is
Irunning.
Caution
While enginerunningWhile enginestopped13UOl1. If the change of the fluid level is 5 mm
I.2 in.) or
more, the air has not been completely bled from thesystem, and thus must be bled completely.
2. If the fluid level rises suddenly after the engine is
stopped, the air has not been completely bled.
3. If air bleeding is not complete, there will be
abnormal noises from the pump and the flow-
control valve, and this condition could cause a
lessening of the life of the pump, etc.
LJ
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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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