clutch MITSUBISHI LANCER EVOLUTION IV 1998 Owner's Manual

MANUAL TRANSMISSION OVERHAUL – Output Shaft22B-33

PSNAP RING INSTALLATION
Select and install a snap ring so that the output shaft rear
bearing clearance will have the standard value.
Standard value: 0 – 0.09 mm
INSPECTION
OUTPUT SHAFT
Check the splines for damage and wear.
NEEDLE ROLLER BEARING
(1) Check to ensure that when the bearing sleeve and gear
are combined and made to rotate, they rotate smoothly
without looseness and noise.
(2) Check the cage for deformation.
SYNCHRONIZER RING
(1) Check to ensure that the clutch gear tooth surfaces are
not damaged and broken.
(2) Check to ensure that the cone inside diameter is not
damaged or worn and that the threads are not crushed.
(3) Press the synchronizer ring against the gear and check
clearance “A”. If “A” is less than the limit, replace.
Limit: 0.5 mm
Snap ring
Gear
Synchronizer
ring

MANUAL TRANSMISSION OVERHAUL – Output Shaft22B-34
OUTER SYNCHRONIZER RING / INNER
SYNCHRONIZER RING / SYNCHRONIZER CONE
(1) Check to ensure that the clutch gear tooth surfaces and
cone surfaces are not damaged and broken.
(2) Install the outer ring, inner ring and cone, press them
against the gear, and check clearance “A”. If “A” is less
than the limit, replace.
Limit: 0.5 mm
Caution
When any of the outer ring, inner ring or cone has
to be replaced, replace them as a set.
SYNCHRONIZER SLEEVE AND HUB
(1) Check to ensure that when the synchronizer sleeve and
hub are combined and made to slide, they slide smoothly
without binding.
(2) Check to ensure that the front and rear ends of the sleeve
inside surface are not damaged.
Caution
When replacement of either the synchronizer sleeve
or hub is necessary, make sure that the synchronizer
sleeve and hub are replaced as a set.
SYNCHRONIZER SPRING
Check to ensure that the spring is not sagging, deformed
or broken.
SPEED GEARS
(1) Check to ensure that the helical and clutch gear tooth
surfaces are not damaged or worn.
(2) Check to ensure that the synchronizer cone surfaces
are not roughened, damaged or worn.
(3) Check to ensure that the gear inside diameter and front
and rear surfaces are not damaged and worn.
Damage, Break
Damage, Break
Damage,
Break
Gear
Outer ring
Cone
Inner ring
Sleeve
Hub

MANUAL TRANSMISSION OVERHAUL – Clutch Housing22B-41
CLUTCH HOUSING
DISASSEMBLY AND REASSEMBLY
4
2
1
3
8 6 7
5*
9.8 {1.0}
Unit: Nm {kgf
m}
Disassembly steps
1. Clutch release bearing retainer

E2. Oil seal
A

D3. Outer race
B

C4. Outer race
B5. Bushing*

A6. Cover-A

A7. Cover-B
8. Clutch housing
NOTE:
*: Never remove the bushings from the clutch housing.
Only the case when installing new bushings into a new clutch housing, refer to
B.

MANUAL TRANSMISSION OVERHAUL – Clutch Housing22B-42
DISASSEMBLY SERVICE POINTS
A
OUTER RACE REMOVAL
B
OUTER RACE REMOVAL
REASSEMBLY SERVICE POINTS

ACOVER-A / COVER-B INSTALLATION
Install the covers directed as shown in the illustration

BBUSHING INSTALLATION
Press fit the bushing to the illustrated position, while making
sure that the split ends of the bushing do not coincide with
the air purge groove.
Outer race
MD999566
MD999566
Cover-B
Cover-A
Bushing
Air purge groove
Bushing
1 mm

MANUAL TRANSMISSION OVERHAUL – Clutch Housing22B-43

COUTER RACE INSTALLATION

DOUTER RACE INSTALLATION

EOIL SEAL INSTALLATION
Apply transmission oil to the oil seal lip area.
Transmission oil: DIA QUEEN MULTI-GEAR OIL 75W/85W
MB990935
MB990938
MB991445MB990938
MB990928
MB990938

REAR AXLE – Service Specifications / Lubricant / Sealant27-2
SERVICE SPECIFICATIONS
<Vehicles with AYC>
ItemsStandard valueLimit
Rear axle total backlash mm–5
Pressure generated by hydraulic unit MPa {kgf/cm2}0 – 1.6 {10.0 – 16.0}–
Wheel bearing axial play mm–0.05
Wheel bearing rotation starting torque Nm {kgf
cm}–1.0 {10.5} or less
<Vehicles without AYC>
ItemsStandard valueLimit
Right-to-left difference in combined thickness of friction plate and fric-
tion disc mm0 – 0.05–
Clearance between spring plate and differential case mm0.06 – 0.25–
LSD differential torque
Nm {kgf
m}
When new clutch plate is installed5 – 19 {0.5 – 1.9}–
Nm {kgf
m}
When existing clutch plate is installed2 – 19 {0.2 – 1.9}–
Distortion of friction plate and friction disc mm–0.08
Difference in thickness between friction plate, friction disc, and spring
plate mm–0.1
LUBRICANT
<Vehicles with AYC>
ItemsSpecified lubricantCapacity
Gear oilTorque
transfer
differential
DifferentialMITSUBISHI GENUINE DIA QUEEN SUPER
HYPOID GEAR OIL (GL-5)0.41 ± 0.02 dm3
{0.41 ± 0.02 }
differentialTorque transfer
mechanismMITSUBISHI GENUINE DIA QUEEN AYC FLUID0.700
0.05dm3
{0.700
0.05}
Hydraulic piping fluidMITSUBISHI GENUINE DIA QUEEN ATF-SPII1 dm3 {1 }
Torque transfer mechanism oil seal lipsVaselineAs required
SEALANT
<Vehicles with AYC>
ItemsSpecified sealant
Torque transfer differential vent plugSemi-drying sealant: THREEBOND 1281B (460 g)
Torque transfer mechanism cover

REAR AXLE – Special Tools27-4
Tool UseName Number
AB
MB990241
A: MB990242
B: MB990244Rear axle shaft
puller
A: Puller shaft
B: Puller bar
Removal of drive shaft

Removal of rear hub assembly
MB991354Puller body
A: MB991017
B: MB990998
C: MB991000A, B: Front hub
remover &
installer
C: Spacer
Temporary fixing of unit bearing

Measurement of wheel bearing rotation
starting torque

Measurement of wheel bearing axial play
Use MB991000 (component
of MB990998) for the spacer.
MB990326Preload socket
Measurement of wheel bearing rotation
starting torque

Measurement of drive pinion preload
MB991406,
MB990635, or
MB991113Steering linkage
puller
Disconnection of ball joint

Removal of hub bolt
MB991460PlugPrevention of differential oil from being dis-
charged and entry of foreign matter <differen-
tial>
MB990988Side gear holding
tool setMeasurement of clutch plate preload <vehicles
without AYC>
MB990850End yoke holderRemoval and installation of companion flange

REAR AXLE – Troubleshooting <AYC>27-25
Terminal
No.Normally Check requirement Check item
18TPSIgnition switch:
ON
Accelerator pedal: Fully closed0.3 – 1.0 V
ON
Accelerator pedal: Fully open4.5 – 5.0 V
23Diagnosis data input/output1 V or less
24Idle position switchIgnition switch:
ON
Accelerator pedal: Fully closed2 V or less
ON
Accelerator pedal: Fully open4.5 – 5.0 V
25Accumulator pressure
switchIgnition switch:
ONAccumulator internal pressure:
Low2 V or less
Accumulator internal pressure:
HighBattery voltage
26ECU groundAt all times0 V
31AYC-ECU power supplyIgnition switch: ONBattery voltage
Ignition switch: OFF0 V
35AYC motor relayIgnition switch:
ON
When motor is energizedBattery voltage
ON
When motor is deenergized2 V or less
36AYC warning lampIgnition switch:
ON
When lamp is OFFBattery voltage
ON
When lamp is ON2 V or less
37Directional control valve
(right)
Ignition switch:
ON
Right clutch: ONBattery voltage
(right)ON
Right clutch: OFF0 V
38Proportioning valveIgnition switch:
ONAYC-ON0 V to battery volt-
age
AYC-OFF0 V
39ECU backup power supplyAt all timesBattery voltage
45Directional control valve
(left)
Ignition switch:
ON
Left clutch: ONBattery voltage
(left)ON
Left clutch: OFF0 V
46ECU groundAt all times0 V
NOTE
*1: Indicates the vehicles with ABS.

REAR AXLE – LSD Case Assembly <Vehicles without AYC>27-47
ASSEMBLY SERVICE POINTS
AINSTALLATION TO DIFFERENTIAL CASE B
Before starting the assembly procedure, perform the following
steps to adjust dimensional differences (clutch plate friction
force) in the axial direction of the components inside the
differential case and axial clearance of the differential side
gear.
(1) Place friction discs (two each) and friction plates (three
each) one on top of another as illustrated and, using
a micrometer, measure the thickness of each of the right
and left assemblies. Select different discs and plates so
that the difference between the right and left assemblies
falls within the specified range.
Standard value: 0 – 0.05 mm
NOTE
If a new part is used, note that the friction disc comes
in two thicknesses: 1.6 mm and 1.7 mm.
(2) Measure the thickness of each of the right and left spring
plates.
(3) Assemble the pressure ring internal parts (pinion shaft
and pressure ring), friction plates, and friction discs and,
using a micrometer, measure the overall width.
NOTE
When taking measurements, press the assembly from
both sides so that the pinion shaft makes a positive contact
with the groove in the pressure ring.
(4) Find value (A) which is the thickness measured in step
(3) added to the thickness of two spring plates.
(5) Find dimension (B) between the spring plate faying
surfaces when differential case A and B are assembled
together.
B = C + D – E
(6) If the clearance between the spring plate and differential
case (B – A) is outside the specified range, change the
friction discs and make adjustments.
Standard value: 0.06 – 0.25 mm
(7) Coat each part with the specified gear oil and mount
it in the specified direction and order into differential case
B.
Gear oil: DIA QUEEN LSD GEAR OIL
NOTE
Apply a careful coat of gear oil to the contacting and
sliding surfaces.
Groove
Differential
case ADifferential case B
Spring plate
Friction disc
Friction plate

REAR AXLE – LSD Case Assembly <Vehicles without AYC>27-48
BSCREW TIGHTENING
(1) Align the alignment mark on differential case A with that
on differential case B.
(2) Tighten the screws connecting differential case A and
B a uniform amount little by little in the diagonal order.
NOTE
If tightening the screws does not bring the two cases
properly together, spring plates are not probably
assembled properly. Reassemble from the start.
CLSD DIFFERENTIAL TORQUE CHECK
(1) Using the special tool, check for differential torque.
Standard value:
When new clutch plate is
installed Nm {kgf
m}When existing clutch plate is
reused Nm {kgf
m}
5 – 19 {0.5 – 1.9}2 – 19 {0.2 – 1.9}
NOTE
Before measuring the differential torque, first turn the
gears so they snug each other, then take measurements
during rotation.
(2) If the measurement falls outside the specified range,
disassemble the differential case assembly and repair
or replace defective parts.
INSPECTION
1. DIFFERENTIAL CASE INTERNAL PARTS
CONTACT/SLIDING SURFACE CHECK
(1) Clean the disassembled parts with cleaning oil and dry
them with compressed air.
(2) Check each plate, disc, and pressure ring for the following:
A. Friction and sliding surfaces of friction discs, friction
plates, and spring plates.
Replace a defective part with heat discoloration and
excessive wear with a new one, as it degrades locking
performance.
NOTE
If the inner periphery of the friction face shows traces
of harsh contact, it is because of the spring tension
of each plate, disc and other part. Do not confuse
this with abnormal wear.
B. Inner periphery and outer periphery protrusions of
friction discs, friction plates, and spring plates.
Replace a cracked or damaged part with a new one.
C. Friction and sliding surfaces between pressure rings
and friction discs.
MB990989MB990990
Friction disc
Friction plateSpring plate
Pressure ring