1991 MITSUBISHI 3000GT check oil

37A-30STEERING - Power Steering Oil Pump
13R0433
Connector
13K752
Terminal assembly
Side plate613N0059
Suction connector
mounting portion
of oil pump body
13K75313NOOSi
13FOO50
INSPECTIONM37RGAM
l Check the flow control spring for wear.
lCheck the shaft of the pulley for play and round movement.
l Check the groove of rotor vane for “stepped” wear.
l Check the contact surface of cam ring and vanes for
“stepped” wear.
l Check the vanes for breakage.
CHECK OF GAP BETWEEN VANE AND ROTOR GROOVEInstall vane to rotor groove as illustrated. Measure the gap
between vane and rotor groove with thickness gauge.
Limit: 0.06 mm
(.0024 in.)
M37RHBISERVICE POINTS OF REASSEMBLY25. 21.
13.9.7.INSTALLATION OF O-RINGSApply specified fluid on O-rings to install.
No.I.D. x Width
111 x1.9 (.433 x ,075)
213x1.9(.512 x ,075)
317.8 x 2.4
(.701 x ,094)
413.5x1.5
(.531 x .059)
53.8 x 1.9 (. 150 x ,075)
616.8 x 2.4
i.661 x ,094)
mm (in.)
I1
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14. INSTALLATION OF SPRINGFit the spring to the oil pump body with the larger-diameter
end at the terminal assembly side.
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37B-1
li 4-WHEEL STEERING
SYSTEM (4WS)
CONTENTSMWAA-0
CONTROL VALVE................................................9SPECIAL TOOLS....................................................2
POWER CYLINDER............................................6SPECIFICATIONS................................................2
REAR OIL LINEGeneral Specifications
....................................2....................................................10Lubricants...............................................:............2
REAR OIL PUMP....................................................11Service Specifications....................................2
LJ
SERVICE ADJUSTMENT PROCEDURES . . . . . .4TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .._._._3Ball Joint Rotation Starting Torque Check
. . . .5Bleeding
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .._______._4
Function Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Rear Oil Pump Discharge Flow Volume
Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .._...........................5

4-WHEEL STEERING SYSTEM (4WS) - Troubleshooting
TROUBLESHOOTING
37B-3
M37EMKBefore inspecting, check the following items:
l Oil pump drive belt tension
lEnsure that the suspension has not been mod-@Power steering fluid level, and air in the system
ified
l Engine
Idle soeed and even idle
lTire and wheel size, specifications, air pressure,
l Oil leakage
balance and amount of wear
l Steering wheel type
l Wheel alignment
Malfunction symptom
4WS does not operateMalfunctioning system
Power cylinderInspection item
Tie rod swing torque
Power cylinder slide resistance
Rear oil pump
Flow volume check
Control valve
-
Poor steering feelingSteering gears and linkage
Rack cracks or deformationFeeling of friction in steering
Poor steering return
Steering wheel efforts
excessive
Control valve
Oil leakage from control valve jornt
Rear wheels cannot be
steered
Poor rear wheels return
Hydraulic pressure for rear
wheel is constantly high
Long rear wheel steering
delayPoor steering response
Poor steering returnPower cylinder
Oil lineOil reservoir
Control valve
Power cylinder
Rear oil pump
Power cylinder
Oil leakage from piston rod
Pressure hose breakage
Oil reservoir deformation or oil leakage
Stuck control valve spool
Stuck power cylinder
Relief valve remains open
Excessive power cylinder friction-
Looseness in power cylinder tie rod ball jo.int
Ball joint dust cover cracks
Poor rear wheel steeringresponsePoor rear wheel steeringrange
Poor steerability (extremetire wear)Control valve
Power cylinder
Rear oil pump
Power cylinder
Oil leakage from control valve spool
Oil leakage from power cylinder
Extreme oil pump internal wear
Tie rod length improperly adjusted after toe-inadjustment
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37B44-WHEEL STEERING SYSTEM (4WS) -Service Adjustment ProceduresSERVICE ADJUSTMENT PROCEDURES
M37FKAH
BLEEDING,LJ(1) Bleed air from power steering system (Refer to GROUP
37A
- Service Adjustment Procedures.)
(2) Lift up the vehicle.
(3) Start the engine and let it idle.
(4) Loosen the bleeder screw on the left side of the control
valve and set the special tool to the bleeder screw.
(5) Turn the steering wheel all the way to the left, immediately
returning it half way back.
At this time confirm that air is discharged with the fluid.
(6) Repeat step (5) two or three times, then check to ensure
that all air has been bled from the system.
(7) Repeat steps (4) through (6) for the right side bleeder
sc,rew, turning the steering wheel to the right this time.
(8) Loosen the power cylinder bleeder screw and set the
special tool to the bleeder screw.
Caution
Loosen the bleeder screw about 30 to 45 degrees, andsecure it with the special tool (rotation prevention
metal fixtures) so as not to be loosened more.
(9) Start the engine, running the vehicle at an indicated speed
I/l1Iof about 70-80 km/h (43-50 mph) to circulate the fluid.
-13FOO13
Caution
When replenishing the fluid, take special care as all fourIwheels will be rotating.
Fluid level difference within
5 mm (.20 in.)
While
engineWhile engine isIS runningstopped13lJO13~(lO)Maintain an indicated speed of about 30-40 km/h (19-25
mph), turning the steering wheel all the way to both left and
right.
When the wheel is steered all the way in either direction,
pressure will rise and air will circulate inside the tube
(special tool). Check to ensure that this air is discharged into
the oil reservoir.
(1 l)Repeat step (10) several times until that all air in the system
has been bled.
(12)Ensure that the difference in the fluid levels when the
engine is running and when it is stopped are within 5 mm(.20 in.).
If the difference exceeds 5 mm
(.20 in.), there is still air in
the system and it must be bled again.
Caution
If air has not been completely bled from the system, the
pump will make a humming sound or an unusual noise ,,
will come from the flow control valve; this also
dcontributes to shortened pump life.
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4-WHEEL STEERING SYSTEM (4WS) -Service Adjustment Procedures37B-5
Rubber hose
13FOOl
Graduated cylinder13FOOllFUNCTION CHECK
_M37FWAA
(1) Raise the vehicle so that all four wheels may turn freely.
(2) Start the engine, running the vehicle at an indicated speed
of about 80
km/h (50 mph).
(3) Turn the steering wheel all the way to left and right and turn
it swiftly, checking to ensure that the rear wheels steer to
the same directions as the front wheels.
REAR OIL PUMP DISCHARGE FLOW VOLUME
CHECKM37FLBA
(1) Disconnect the pressure hose from the rear oil pump and
install the special tool with a rubber hose.
(2) Place the other end of the rubber hose in a container which
permits measurement of flow rate (2-liter graduated cylin-
der).(3) Start the engine. Increase speed slowly, then hold the
indicated speed of 50 km/h (31 mph), measuring discharge
flow volume for 30 seconds.
Caution
While performing this work, continuously add fluid intothe oil reservoir.
Standard value: Approximately
1.0 liter (1.06 qts.)
(4) If the discharge flow volume is extremely high or low, the
rear oil pump should be replaced.
BALL JOINT ROTATION STARTING TORQUE
CHECKM37FECA
(1) Holding the power cylinder tie rod with a spanner, discon-
nect the tie rod and trailing arm.
(2) After swinging the ball joint stud several times, install the
stud nut, then measure the ball joint rotation starting torque
with the special tool.
Standard value: 0.5 Nm (4
in.lbs.) or less
(3) If the rotation starting torque exceeds the standard value,
replace the tie rod end.
(4) If the rotation starting torque is less than the standard
value, check that the ball joint is not loose and operates
smoothly. If not, it may be reused.
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37B-64-WHEEL STEERING SYSTEM (4WS) - Power CylinderPOWER CYLINDER
REMOVAL AND INSTALLATION
M37S&~I
l Cleaning of Pipings with Steam
l Removal of Main Muffler Assembly(Referto GROUP 15- Exhaust Pipe and Muffler.)
Ilo-130Nm
l Installation of Main Muffler Assembly
l Refilling and Bleeding of Power Steering System
(Refer to GROUP 37A-Service Adjustment
\78 Nml;O- 130 Nm
56
ft.lbs.80 - 94 ft.lbs.
Procedures.)l Bleeding of 4WS System
(Refer to P.37B-4.)l Checking of 4WS System for Operation
(Refer to P.37B-5.)‘0 Checking of Wheel Alignment
(Refer to GROUP 34 -Service Adiustment
1 Procedures.)
f @, ’ i%,s. yf ,30Nm,
78 NmIIO-130Nm80 -94 ft.lbs.56 ft.lbs.
80 - 94 ft.lbs.Removal steps
1. Rear shock absorber lower mounting bolt
2. Crossmember bracket
a*3. Crossmember mounting nut
(on differential side)
4. Pressure tube
(RL)5. O-ring
6. Pressure tube (RR)
7. O-ring
8. Oil line clamp bolt
4*9. Tie rod end nut
l * 10. Power cylinder installation bolt
l * 11. Power cylinder
Fluid line flared nut
15 Nm
11 ft.lbs.14FO38
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37B-10$-WHEEL STEERING SYSTEM (4WS) - Rear Oil Line
REAR OIL LINEM37YFv -
REMOVAL AND INSTALLATION
35 Nm25 ftlbs.
\Removal steps
12 Nm9 ftlbs.
13FOO24
1. Return hose
2. Suction hose
3. Protector
4. Pipe assembly to pressure
tube connection
5. Pipe assembly
6. Suction hose
7. Rubber hose
8. Feed pipe assembly
9. Return pipe assembly
10. Pressure tube assembly to
pipe assembly connection
11. Suction hose
12. Reserve tank
l Cleaning of Pipings with Steam
Post-installation Operationl Refilling and Bleeding of Power Steering System
(Refer to GROUP 37A-Service AdjustmentProcedures.)l Bleeding of 4WS System
(Refer to P.37B-4.)l Checking of 4WS System for Operation
(Refer to P.37B-5.)
INSPECTIONM37YCAnl
Check tubes and pipes for cracking, damage or corrosion.
l
Check hoses for cracking, damage, leakage or fluid seep-
age.l Check flare nuts for damage.
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4-WHEEL STEERING SYSTEM (4WS) - Rear Oil Pump37B-11
REAR OIL PUMP
REMOVAL AND INSTALLATION/
l Draining of Power Steering Fluid
(Refer to GROUP 37A- Service Adjustment
l Removal of Main Muffler Assembly(Refer to GROUP 15 - Exhaust Pipe and Muffler.)
Post-installation Operationl Installation of Main Muffler Assembly(Refer to GROUP 15 - Exhaust Pipe and Muffler.)l Refilling and Bleeding of Power Steering System
(Refer to GROUP 37A- Service AdjustmentProcedures.)l Bleeding of 4WS System
(Refer to P.37B-4.)l Checking of 4WS System for Operation
(Refer to P.37B-5.)
IIO-130Nm80- 94 ft.lbs.Removal steps
1. Rear shock absorber lower mounting bolt4*2. Crossmember bracketa*3. Crossmember mounting nut4.~rry~~,ff~h;t~Jside)
5.Suction hose6. Rear-wheel oil pump7. O-ring80
-94ft.lbs.
13FOO23
NOTEDo not disassemble the rear-wheel oil pump.
M3?MA- -12AOlOS
3
SERVICE POINTS OF REMOVALM37MBAA
2. REMOVAL OF CROSSMEMBER BRACKET / 3. CROSS-MEMBER MOUNTING NUT (ON DIFFERENTIAL SIDE)
(1) Support the differential case with the transmission jack,
then remove the crossmember bracket and crossmem-
ber mounting nut (on the differential side).
(2) Slightly lower the crossmember.
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