1991 MITSUBISHI 3000GT Service Manual

STEERING - Power Steering Oil Pump37A-29
DISASSEMBLY AND REASSEMBLYMS’RE- -
:iuid:VllTSlJBlSHI PLUS ATF/Automatic trans-
nission fluid “DEXRON” or “DEXRON II”
20 Nm
14
ft.lbs.
13N0030
Oil pump seal kit1 Oil pump cartridge kit
8N6ft.lbs.
13N0031Disassembly steps25-30
Nm18 - 22ft.lbs.
15. Plunger
:I*a3.
4.
l a5.l a6.*a7.8.**9.10.
11.
Pump coverO-ringVanes
Rotor
Cam ring
Side plate
O-ring
Connector
O-ring
Flow control
Flow control
Piston rodSnap ring
Terminal
Washer
Insulator
O-ring
Plug
Clip
Suction connectorO-ring
Oil pump body and Pulley assembly
12. Terminal assembly
l * 13. O-ring
l * 14. Spring
Caution
Do not disassemble the flow control valve.TSB Revision

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
I
I
I
I
t i
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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I

STEERING - Power Steering Oil Pump37A-31 1
Dowel pin
131025i
Direct round edgeto the cam nng6. INSTALLATION OF SIDE PLATE
Line up the dowel pin hole of the side plate with the dowel
pin of the pump body when installing the side plate.
5. INSTALLATION OF CAM RING
Install the cam ring with the punch mark facing the side
plate.3. INSTALLATION OF VANES
Install the vanes on the rotor, paying close attention to the
installation direction.
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37A-32STEERING - Power Steering Hoses
POWER STEERING HOSES
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation
Il Draining, Supplying, and Bleeding of
the Power Steerina Fluid
(Refer to
P.37A-9,‘iO.)

12 Nm5Nm
8 ftlbs.4 ftlbs.
I12Nm
8 ft.lbs.
35Nm
12 Nm25ft.lbs.
8 ftlbs.2
I24 Nm
22 Nm17 f-tlbsad/16 ft.lbs.
11 klbs.
112/Nm8 ftlbs.M37TA.
_Removal steps
I. Return hose
2. Suction hose
3. Return hose
l a 4. Pressure hose
5. O-ring6. Cooler tube
7. Pressure tube
8. Return tube
9. O-ring
IO. Oil reservoir
3
White line
13po14:
SERVICE POINT OF INSTALLATIONM3TTDAG
4. INSTALLATION OF PRESSURE HOSE
(1) Connect the pressure hose so that its slit part contacts
the oil pump’s guide bracket.
(2) When the pressure hose is installed, align the white line
on the pressure hose with the white line on the
pressure tube so that together they form a straight line.
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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

37B-24-WHEEL STEERING SYSTEM (4WS) -Specifications / Special Tools
SPECIFICATIONS
GENERAL SPECIFICATIONSM37CA-B
Items
Power steering gear box
Type
Oil pump
Type
Displacement
cm”/rev. (cu.in./rev.)
Relief set pressure
MPa (psi)
Rear oil pump
Type
Displacement
cm’/rev. (cu.in./rev.)
Relief set pressure
MPa (psi)
Power cylinder
Type
Strokemm (in.)
Specifications
Rack and pinion
Vane type
9.6 (0.59)
8 (1,138)
Vane type
3.3 (0.20)
4 (569)
Hydraulic double action type
20 i.78) [one side 10 (.39)1
SERVICE SPECIFICATIONSM37CEB
Items
Standard value
Specifications
Rear oil pump displacement [at speedometer reading of
31 mph (50 km/h) for 30 seconds]liter (qts.)
Power cylinder ball joint rotation starting torqueNm (in.lbs.)
Power cylinder tie rod swing torqueN (Ibs.) [Nm (in.lbs.)]
Power cylinder slide resistanceN (Ibs.)
Approx. 1 .O (1.06)
0.5 (4) or less
9 - 55 (2 - 12) IO.5 - 3.0 (4 - 26)l
67 (15) or less
LUBRICANTSM37CD.B
,II
Items
Power steering fluid
Dust cover
Specified lubricant
MITSUBISHI PLUS
ATFiAutomatic Trans-mission fluid “DEXRON” or “DEXRON II”
‘Silicone grease
Quantity
1.45 liter (1.53 qts.)
As requiredSPECIAL TOOLS
M37DA-6
MB990993-01Power steering oilpressure gauge
Measurement of fluid flow volumeTSB Revision

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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