oil pressure MITSUBISHI LANCER EVOLUTION IV 1998 Owner's Guide

REAR AXLE – LSD Case Assembly 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 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

REAR AXLE – LSD Case Assembly 27-49
Grind a dented or scratched part with oil stone and
then lap and correct with a compound on a surface
plate.
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.
(3) Check the following parts for contact and sliding surfaces
(D to M) and correct burrs and dents with oil stone.
D: Sliding surfaces of side gear and case
E: Contacting surfaces of differential case and spring
plate
F: Contacting surfaces of pressure ring and differential
case inner face
G: Sliding surfaces of pressure ring hole and side gear
H: Protrusions on outer periphery of pressure ring
I: Pressure ring inner surface and differential pinion
gear spherical surface
J: Pressure ring V-groove and pinion shaft V
K: Sliding surfaces of pinion shaft and differential pinion
gear hole
L: Side gear grooves on outer periphery
M: Slits in inner periphery of differential
2. FRICTION PLATE AND FRICTION DISC
DISTORTION CHECK
Apply a dial indicator to the friction plate or disc on a surface
plate and, turning the friction plate or disc, measure the
distortion (flatness).
Limit: 0.08 mm (total runout)
3. FRICTION PLATE, FRICTION DISC, AND SPRING
PLATE WEAR CHECK
(1) For the purpose of determining wear, measure thickness
(A, B) of the friction surface and protrusion at several
places and find the difference between the two.
Limit: 0.1 mm
(2) If the wear exceeds the limit, replace the part with a
new one.

STEERING – Power Steering Oil Pump37A-7
POWER STEERING OIL PUMP

REMOVAL AND INSTALLATION
Pre-removal Operation
Power Steering Fluid DrainingPost-installation Operation
(1) Power Steering Fluid Supplying
(2) Drive Belt Tension Adjusting
(Refer to GROUP 11 – On-vehicle Service.)
12 3
4 5
6 7
8 9 10
Unit: Nm {kgf
m}
49 {5.0}
59 – 69
{6.0 – 7.0} 10 – 12
{1.0 – 1.2}39 {4.0}
49 {5.0}
18 {1.8}
12 {1.2}
39 {4.0}
Removal steps
1. Drive belt
2. Pressure switch connector
3. Suction hose
4. Pressure hose
5. O-ring6. Heat protector
7. Bolt
8. Bolt
9. Oil pump assembly
10. Oil pump bracket

STEERING – Power Steering Oil Pump37A-8

REMOVAL AND INSTALLATION
Pre-removal Operation
Power Steering Fluid DrainingPost-installation Operation
(1) Power Steering Fluid Supplying
(2) Drive Belt Tension Adjusting
(3) Power Steering Fluid Line Bleeding
12
34
56
7
8 9 10
Unit: Nm {kgf
m}
22 {2.2}
11
22 {2.2}
52 {5.3}24 {2.4} 12 {1.2}
18 {1.8}
Removal steps
1. Drive belt
2. Suction hose
3. Pully
4. Pressure hose
5. O-ring
6. Heat protector A7. Heat protector B
8. Pressure switch connector
9. Bolt
10. Bolt
11. Oil pump assembly