suspension MITSUBISHI 3000GT 1991 Workshop Manual

ELECTRONIC CONTROL SUSPENSION (ECS) - Circuit Diaaram 33B-23
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33B-24 ELECTRONIC CONTROL SUSPENSION (ECS) - Circuit Diagram
FRONT SHOCK ABSORBERtLH)
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REAR
SUSPE,NSlON
CONTENTSM34AA-.

REAR SUSPENSION ASSEMBLY. . . . . . . . . .._..24
SERVICE ADJUSTMENT PROCEDURES. .
23
Rear Wheel Alignment Inspection. . . . . . . . . .23
SHOCK ABSORBER ASSEMBLY. . . . . . . . . . . . .33
SPECIAL TOOLS .
.._____......_..................._.................20SPECIFICATIONS
.__............................................. 19
General Specifications. . . . . . . . . . . . . . . . . . . .19
/
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Service Specifications.._............................... 19
STABILIZER BAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34TRAILING ARM
.._........_._...................................... 30
TROUBLESHOOTING
_....................................... 22
UPPER AND LOWER ARM. . . . . . . . . . . . . . . . . . . ..t..........27
REAR AXLE HUB................................................
17
REAR SUSPENSION ASSEMBLY....................7
SERVICE ADJUSTMENT PROCEDURES........5
Rear Hub Rotary-sliding Resistance
(Torque) Inspection................................................
6
Rear Wheel Alignment Inspection....................
5
Wheel Bearing End Play Inspection....................6
SHOCK ABSORBER ASSEMBLY....................13
SPECIAL TOOLS....................................................
3
SPECIFICATIONS................................................2
,General Specifications....................................2
Service Specifications....................................2
STABILIZER BAR................................................15
TRAILING ARM....................................................11ITROUBLESHOOTING
4........................................UPPER ARM, LOWER ARM AND
ASSIST LINK91........................................................
iI

34-2REAR SUSPENSION - Specifications
SPECIFICATIONS
GENERAL SPECIFICATIONS
Items
Suspension system
Coil spring
Wire dia. x O.D. x free lengthmm (in.)
Coil spring identification color
Spring constantN/mm (Ibs./in.)
Shock absorber
Type
Max. lengthmm (in.)
Min. lengthmm (in.)
Strokemm (in.)
Damping force [at 0.3 m/set. (.9 ftisec.)]
ExpansionN (Ibs.)
ContractionN (Ibs.)aheel
bearing
Type
Vehicles without ECSVehicles with ECS
Multi-link12X95X350
12.2x105x350(47 x 3.74 x 13.78)(.48x4.13x13.78)
Pink x 1
Orange x 1
352 1.8(196? 10.1)35+ 1.8(196+ 10.1)
Hydraulic cylindricaldouble-acting typeHydraulic cylindricaldouble-acting type
515
f 3 (20.2 i .I)515 + 3 (20.2 f .I)
356+3(14.0+.1)356 Ifr 3 (14.0 k .I)
159 (6.3)
159 (6.3)
1,000 + 150 (220 + 33)Hard: 1,800 ? 250 (397 f 55)
Medium: 1,200
rt 170 (265 + 37
Soft: 550
* 90 (121 f 20)
550_+80(121 + 18)Hard: 950 + 140 (209 k 31)
Medium: 850
* 130 (187 f 29)
Soft: 650
t- 100 (143 i 22)
Unit bail bearing
SERVICE SPECIFICATIONSM34CB.A
Items
Specifications
Standard value
Toe-in (Left-right difference)
mm (in.)
Camber
Stabilizer link ball joint starting torque
Nm (in.lbs.)
Ball joint rotation starting torque
Nm (inlbs.)
Stabilizer link protrusion
mm (in.)
Crossmember bushing projection,mm (in.)
I0.5 + 2.5
(.Ol + .09)
0” 2 30’
1.7-3.2(15-28)
2-9(17-78)
5-7(.197-,276)
8.5 - 9.5 (33 - .37)
Limit
Wheel bearing end playmm (in.)
Rear hub rotary-sliding resistance
N (Ibs.)
Rear hub rotary-sliding torqueNm (ftlbs.)0.05
(002) or less
31 (7) or less
1.8 (I .30) or lessTSB Revision

REAR SUSPENSION - Special Tools
SPECIAL TOOLS
34-3
M34DA-A
pring compressorompressfon 0
member
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34-4REAR SUSPENSION - Troubleshooting
TROUBLESHOOTING
Symptom
Squeaks or other
abnormal noiseProbable cause
Loose rear suspension installation bolts and nuts
Malfunction of shock absorber
Worn bushings
Upper arms
and/or lower arms and/or assistlink deformed or damaged
Trailing arms deformed or damaged
Crossmember deformed or damaged
Excessive tire inflation pressure
Malfunction of shock absorber
Weakpr broken springs
Stabilizer bar and/or stabilizer link deformed
or damaged
Weak or deteriorated bushingsWeak or broken springs
Upper arms and/or lower arms and/or assistlink deformed or damaged
Trailing arms deformed or damaged
Crossmember deformed or damagedRemedy
Retrghten
Replace
Poor ride
Body tiltingAdjust the pressure
Replace
Replace
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REAR SUSPENSION - Service Adjustment Procedures34-5
0 camber
“\
er
ewer arm (L.H.)A-L!?., ’ cLr”“l‘412F002E
SERVICE ADJUSTMENT PROCEDURES
REAR WHEEL ALIGNMENT INSPECTIONM34FAAH
CAMBERStandard value: 0” + 30
To adjust camber, turn the lower arm mounting bolt
(cross-
member side).
NOTE(1) Make the adjustment with the assist link mounting bolt
(crossmember side) loosened.
(2) The difference between the right and left wheels should be30’ or less.
(3) Left wheel: Clockwise
(0 camber)
Right wheel: Clockwise
(0 camber)
One graduation changes camber by about 15’.
TOE-INStandard value: 0.5
-+ 2.5 mm (.Ol + .09 in.)
To adjust toe, turn the assist link mounting bolts (on crossmem-ber side) on both sides
t,he same amount.
NOTE
(1) The difference between right and left wheels should be 3mm (.I2 in.) or less.
(2) Left wheel: Clockwise (toe-in)
Right wheel: Clockwise (toe-out)
One graduation changes toe by about 4.8 mm
(.19 in.)
.
Caution1. Adjust the eccentric bolt within 90” from the central
position.
2.Adjust camber and toe, in that order, and, if camber isadjusted, be sure to adjust toe also.
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34-6REAR SUSPENSION - Service Adiustment Procedures12NOOOl
WHEEL BEARING END PLAY INSPECTIONM34FBAG
1.Inspect the play of the bearings while the vehicle is jackedup and resting on floor jack.
2. Remove the hub cap and then release the parking brake.
s&i3. Remove the caliper assembly and the brake disc.
4. Check the bearing’s end play.
Place a dial gauge against the hub surface; then move the
hub in the axial direction and check whether or not there is
end play.Limit: 0.05 mm
(.002 in.) or less
NOTEIf the limit value is exceeded, the lock nut should be
tightened to the specified torque and check the end play
again.5. Replace the rear hub bearing unit if an adjustment cannot
be made to within the limit.
REAR HUB ROTARY-SLIDING RESISTANCE (TOR-
QUE) INSPECTION
M34FCAC
1.Inspect the play of the bearings while the vehicle is jackedup and resting on floor jack.
2. Release the parking brake.
3. Remove the caliper assembly and the brake disc.
..J
4.After turning the hub a few times to seat the bearing, attach
a spring balance to the hub bolt, and, pulling at a 90” anglefrom the hub bolt, measure to determine whether or not
the rotary-sliding resistance of the rear hub (the
rotary-sliding torque of the rear hub) is the standard value.
Limit:
Rear hub rotary-sliding resistance
31 N (7 Ibs.) or lessRear hub rotary-sliding torque
1.8 Nm (1.30 ftlbs.) or less
NOTEIf the limit value is exceeded, the lock nut should be
tightened to the specified torque and check the end play
again.5. Replace the rear hub unit bearing if an adjustment cannot
be made to within the limit.
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REAR SUSPENSION - Rear Suspension Assembly34-7
REAR SUSPENSION ASSEMBLYM34GA-A
L/
REMOVAL AND INSTALLATION
140- 160 Nm*IOI- 116ftlbs.
Removal steps
1. Shock absorber mounting nuts (upper)2. ECS connector (ECS)3. Cap4. Brake line clamp bolt5. Brake caliper mounting bolt6. Brake caliper assembly7. Brake disc
8. Parkina brake cable clamo bolt
(Refer to GROUP 15 - Exhaust Pipe and
l * l +9. ParkinG brake cable end ”(Refer to GROUP 36 - Parking Brake.)10. Rear speed sensor clamp bolt (ABS)11. ABS speed sensor (ABS)12. Trailing arm mounting bolt and nut*I)13. Crossmember mounting nut*I)14. Rear suspension assembly
NOTE*.indicates parts which should be temporarily tightened, and
then fully tightened with the vehicle in the unladencondition.
Post-installation Operationl Installation of the Main Muffler(Refer to GROUP 15 - Exhaust Pipe andMain Muffler.)l Check of Wheel Alignment(Refer.to P.34-5.)l Check of Parking Brake Lever Stroke(Refer to GROUP 36 -Service AdjustmentProcedures.)l Installation of the Absorber Lid to Rear Side Trim(Refer to GROUP 52A-Trims.)A12FOllO
SERVICE POINTS OF REMOVALM34GBAT
13. REMOVAL OF CROSSMEMBER MOUNTING NUT / 14.
REAR SUSPENSION ASSEMBLYSupport the crossmember with a transmission jack, then
remove the crossmember mounting nut and rear suspen-
sion assembly.
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34-8REAR SUSPENSION - Rear Suspension Assembly
INSPECTIONM34GcANll Check the crossmember for cracks or deformation.
l Check the bushings for cracks or deterioration.
;d
Press outPress fit12N009fCROSSMEMBER BUSHING REPLACEMENT M34GTAF
(1) Using the special tool, remove and press-fit the bushing.
(2) When press-fitting the bushing, apply soapsuds to it and
position the arrows as shown.
(3) Make sure that the protrusion (dimension A) of the inner
sleeve is up to specification.
Standard value: 8.5
- 9.5 mm (.33 - .37 in.)
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