Mitsubishi Lancer Evolution 7. Manual — part 291
REAR AXLE -
Differential Carrier <Vehicles with mechanical LSD>
27B-49
"
HA BEARING CAP INSTALLATION/FINAL DRIVE
GEAR BACKLASH ADJUSTMENT
Adjust drive gear backlash as follows:
1. Assemble the differential case with the side bearing outer
race to the gear carrier.
2. Press the differential case to one side to measure the
clearance of the side bearing outer race and the gear
carrier.
3. Select two pairs of the side bearing spacer with the thickness
derived from the sum of the clearance and a half of pre-load,
0.05 mm.
4. Remove the side bearing with special tools.
NOTE
Hook the claws of the special tool with the side bearing
inner race by using the notches (two areas) of the LSD
case side.
5. Assemble the selected side bearing spacers to each side.
6. Use special tools to press-fit the side bearing inner case
into the LSD case. After installing the outer race, assemble
the LSD case to the gear carrier.
7. Align the mating marks of differential carrier and the bearing
cap with each other to tighten to the specified torque.
Tightening torque: 37 ± 2 N
·
m
8. Measure the drive gear backlash.
NOTE
Measure at four points or more on the circumference
of the drive gear.
Standard value: 0.11 - 0.16 mm
9. If the backlash is not within the standard value, move the
side bearing spacer as shown in the illustration to adjust
the backlash.
NOTE
The increment of side bearing spacer must be coincided
with the decreased amount.
10. Inspect the tooth condition at the final drive gear and make
an adjustment if required. (Refer to P.27B-39.)
MB990810
Socket
wrench
Contact plate
MB990728
Contact
plate
De-
creased
In-
creased
De-
creased
In-
creased
When the backlash is large
When the backlash is small
REAR AXLE -
Differential Carrier <Vehicles with mechanical LSD>
27B-50
11. Measure the drive gear runout.
Limit: 0.05 mm
12. When drive gear runout exceeds the limit, remove the
differential case and then the drive gears, moving them
to different positions and reinstall them.
13. If adjustment is not possible, replace the differential case
or drive gear and drive pinion as a set.
LSD CASE ASSEMBLY
DISASSEMBLY AND REASSEMBLY
19
2
6
20
5
11
3
4
12
15
16
13
14
10
1
18
17
8
9
7
10
11
11
Differential gear set
10
11
11
Disassembly steps
"
CA D LSD differential torque check
A
A" "BA 1. Screw
2. Differential case A
3. Spring plate
4. Friction plate
5. Friction disc
6. Friction plate
7. Friction disc
8. Friction plate
9. Pressure ring
10. Side gear
11. Pinion gear
12. Pinion shaft
13. Pressure ring
14. Friction plate
15. Friction disc
16. Friction plate
17. Friction disc
18. Friction plate
19. Friction plate
"
AA 20. Differential case B
REAR AXLE -
Differential Carrier <Vehicles with mechanical LSD>
27B-51
REMOVAL SERVICE POINT
A
A" SCREWS REMOVAL
1. Check out the alignment marks.
2. Loosen a uniform amount little by little the screws securing
differential case A to B.
3. Separate differential case B from differential case A and
remove their components.
Keep the removed spring plates, friction plates, and friction
discs organized in the order of removal and for right and
left use.
INSTALLATION SERVICE POINTS
"
AA DIFFERENTIAL CASE B INSTALLATION
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.
A
Groove
REAR AXLE -
Differential Carrier <Vehicles with mechanical LSD>
27B-52
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.
Specified gear oil:
Hypoid gear oil
MITSUBISHI Genuine Gear Oil Part No. 8149630
EX, CASTROL HYPOY LS (GL-5, SAE 90),
SHELL-LSD (GL-5, SAE 80W - 90) or equivalent
NOTE
Apply a careful coat of gear oil to the contacting and
sliding surfaces.
"
BA SCREW 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.
"
CA LSD DIFFERENTIAL TORQUE CHECK
1. Using the special tool, check for differential torque.
Standard value:
Item
LSD differential
torque N·m
When new clutch plate is installed
5 – 19
When new clutch plate is installed
5 – 19
When existing clutch plate is installed
2 – 19
When existing clutch plate is installed
2 – 19
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.
D
Differential
case A
E
C
Differential
case B
Spring plate
Friction plate
Friction disc
MB990990
MB990989
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