Mitsubishi Lancer Evolution VI. Manual - part 25

ENGINE  – 

Turbocharger

11-75

TURBOCHARGER

DISASSEMBLY AND REASSEMBLY

1

2

3

4

5

6

7

8

11 Nm

Disassembly steps

"

F

A D

Inspection of turbocharger waste gate
actuator operation

1. Snap pin
2. Waste gate actuator

"

E

A

3. Coupling

"

D

A

4. Turbine housing

A

A

" "

C

A

5. Snap ring

A

B

" "

B

A

6. Turbine wheel assembly
7. Compressor cover

"

A

A

8. O-ring

ENGINE  – 

Turbocharger

11-76

DISASSEMBLY SERVICE POINTS

A

A

"

SNAP RING REMOVAL

Lay the unit with the compressor cover side facing down
and using snap ring pliers, remove the compressor cover
attaching snap ring.

Caution
When removing the snap ring, hold it with fingers to
prevent it from springing away.

A

B

"

TURBINE WHEEL ASSEMBLY REMOVAL

Remove the turbine wheel assembly, striking the
circumference of the compressor cover with a plastic hammer.
The turbine wheel assembly may be a little hard to remove
due to an O-ring put on the outer circumference.

CLEANING

(1) Use a clean cleaning oil commercially available. Do not

use corrosive cleaning oils as they could damage to some
parts.

(2) Use a plastic scraper or hard brush to clean aluminum

parts.

REASSEMBLY SERVICE POINTS

"

A

A

O-RING INSTALLATION

Apply a light coat of engine oil to a new O-ring and fit in
the turbine wheel assembly groove.

Caution
When installing the O-ring, use care not to damage it.
A damaged O-ring causes oil leaks.

"

B

A

TURBINE WHEEL ASSEMBLY

(1) Apply a light coat of engine oil to the periphery of the

O-ring.

(2) Install the turbine wheel assembly to the compressor cover

in relation to the dowel pin.

Caution
Use care not to damage the blades of turbine wheel
and compressor wheel.

Snap ring

Turbine
wheel
assembly

O-ring

Dowel pin hole

Dowel pin

ENGINE  – 

Turbocharger

11-77

"

C

A

SNAP RING INSTALLATION

Lay the assembly with the compressor cover facing down
and fit the snap ring.

Caution
Fit the snap ring with its chamfered side facing up.

"

D

A

TURBINE HOUSING INSTALLATION

Install the turbine housing in relation to the dowel pin.

Caution
Use care not to damage the blades of turbine wheel.

"

E

A

COUPLING INSTALLATION

Install the coupling and tighten to the specified torque.

"

F

A

WASTE GATE ACTUATOR OPERATION CHECK

Using a tester, apply a pressure of approx. 100.0 kPa to
the actuator and make sure that the rod moves.

Caution
Do not apply a pressure of more than 113.3 kPa to the
actuator. Otherwise, diaphragm may be damaged. Never
attempt to adjust the waste gate valve.

INSPECTION

TURBINE HOUSING

(1) Check the housing for traces of contact with the turbine

wheel, cracks due to overheating, pitching, deformation
and other damage. Replace with a new turbine housing
if cracked.

(2) Operate the waste gate valve lever manually to check

that the gate can be operated and closed smoothly.

Compressor
cover

Turbine wheel
assembly

Chamfered
edge

Snap ring

Dowel pin

Dowel pin hole

Coupling

Traces of contact

ENGINE  – 

Turbocharger

11-78

COMPRESSOR COVER

Check the compressor cover for traces of contact with the
compressor wheel and other damage.

TURBINE WHEEL ASSEMBLY

(1) Check the turbine and compressor wheel blades for bend,

burr, damage, corrosion and traces of contact on the
back side and replace if defective.

(2) Check the oil passage of the turbine wheel assembly

for deposit and clogging.

(3) In the case of water cooled type, check also the water

passage for deposit and clogging.

(4) Check the turbine wheel and compressor wheel for light

and smooth turning.

Oil passage

Turbine wheel

Compressor
wheel

Water passage