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
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