2008 MITSUBISHI LANCER EVOLUTION X Workshop Manual

BASE ENGINE
ENGINE MECHANICAL11A-13
VA LV E S
The valves are made of heat-resistant steel and are
nitrided on their entire surface.
VALVE STEM SEALS
The valve stem seals are integrated with the valve
spring seats.
The valve stem seal portion excels in sealing perfor-
mance and is equipped with a spring to prevent oil
from descending.
VA LV E S P R I N G S
To prevent the engine from surging at high speeds,
unequal-pitch springs are used.
AK502500
LL Dd dD
AD
Intake Exhaust
ItemIntake valveExhaust valve
Head diameter
(D) mm (in)35 (1.4)29 (1.1)
Stem diameter
(d) mm (in)5.5 (0.22)5.5 (0.22)
Overall length (L)
mm (in)113.180
(4.4559)105.887
(4.1688)
AK502501
Spring
AD
AK502502
h
AD
ItemSpecifications
Free height (h) mm (in)47.44 (1.867)
Total number of windings8.67

BASE ENGINE
ENGINE MECHANICAL11A-14
VALVE TAPPETS
To adjust the valve lift, 47 sizes of valve tappets are
available in 0.015 mm (0.0006 in) increments, from
3.000 mm (0.1181 inch) to 3.690 mm (0.1453 in).
MIVEC (MITSUBISHI INNOVATIVE VALVE TIMING ELECTRONIC CONTROL SYSTEM)
The MIVEC consists of the parts shown in the illus-
tration.
This system continuously varies and optimally con-
trols the opening and closing timing of the individual
intake and exhaust valves, in order to improve torque
and power output in all speed ranges.
AK502503
Identification
markThickness
AD
AK503014
Exhaust V.V.T. sprocket
Section A-ASection B-B
Engine oil control
valve filter
Intake V.V.T. sprocket
Cylinder head
Cylinder blockB
B
Engine oil
control valve
Cylinder head
Cylinder block A
A
AE
Engine oil
control valve

BASE ENGINE
ENGINE MECHANICAL11A-15
V.V.T. SPROCKET (VARIABLE VALVE TIMING SPROCKET)
The engine oil control valve controls the hydraulic
pressure in order to move the vane rotor in the V.V.T.
sprocket to optimally control valve timing.
CAMSHAFT
The camshaft are hollow for weight reduction.
Each camshaft is provided with an oil passage to
guide the hydraulic pressure from the engine oil con
-
trol valve to the V.V.T. sprocket.
A cam position sensing cam for detecting the cam
position (used by the cam position sensor) is inte
-
grated at the back of each camshaft.
AK503061
Timing mark
Vane housing
Vane housing
Sprocket
SprocketRetard oil chamberRetard oil chamber
Vane roter
Vane roter
Advance oil
chamber
Advance oil
chamber
Stopper pin
Stopper pin
V.V.T. sprocket
bolt
V.V.T. sprocket
boltVane
bushing
Vane bushing
Spring Intake V.V.T. sprocket
Exhaust V.V.T. sprocketTiming mark
AD
AK502506
Intake camshaft
Exhaust camshaft Retard
oil channel
Retard
oil channelAdvance
oil channel
Advance
oil channelDowel pin
Hollow sectionSealing capCam positon
sensing cam
AD

BASE ENGINE
ENGINE MECHANICAL11A-16
ENGINE OIL CONTROL VALVE
The engine oil control valve consists of a solenoid
valve, which switches the hydraulic pressure that
acts on the vane rotor in the V.V.T. sprocket assem
-
bly. This valve is actuated by a signal from the
engine ECU.
ItemSpecifications
Overall length mm (in)Intake435.00 (17.126)
Exhaust438.27 (17.255)
Journal outer diameter mm (in)IntakeNo.130 (1.2)
No.2 − 524 (0.9)
ExhaustNo.136 (1.4)
No.2 − 524 (0.9)
Camshaft lift mm (in)Intake8.45 (0.333)
Exhaust8.20 (0.323)
AK302997AE
Spring guide
Valve sleevePlunger springSpool
O-ringInsulation
coilar
Stator
Guide capBracketYo k eSeal cap Plunger ShaftTerminal Bobbin
TapeEnameled
copper wire
Drain
Drain
Pump Pressure
chamberDefault
pressure
chamber

BASE ENGINE
ENGINE MECHANICAL11A-17
TIMING CHAIN CASE
The timing chain case is made of an aluminum alloy.
A front crankshaft oil seal is press-fit into the case.
AK502507
Oil seal
AD
Timing chain case

NOTES

17-1
GROUP 17
ENGINE AND
EMISSION
CONTROL
CONTENTS
ENGINE CONTROL . . . . . . . . . . . . . .17-2
GENERAL INFORMATION . . . . . . . . . . . . . 17-2
AUTO-CRUISE CONTROL SYSTEM17-2
GENERAL INFORMATION . . . . . . . . . . . . . 17-2
CONSTRUCTION AND OPERATION . . . . 17-5
EMISSION CONTROL . . . . . . . . . . . .17-8
GENERAL DESCRIPTION . . . . . . . . . . . . . 17-8
CRANKCASE VENTILATION SYSTEM . . . 17-10
EVAPORATIVE EMISSION CONTROL
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-11
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM . . . . . . . . . . . . . . . . . 17-12
EMISSION REDUCTION SYSTEMS. . . . . . 17-14

ENGINE CONTROL
ENGINE AND EMISSION CONTROL17-2
ENGINE CONTROL
GENERAL INFORMATIONM2170001000659
For the accelerator system, an electronic throttle
valve control system has been adopted, disposing of
an accelerator cable. This system detects the accel
-
erator pedal travel by using a accelerator pedal posi-
tion sensor (APP sensor) in the accelerator pedal
assembly for electronic control of the throttle valve
angle.
CONSTRUCTION DIAGRAM
AUTO-CRUISE CONTROL SYSTEM
GENERAL INFORMATIONM2170001000682
By using the auto-cruise control system, the driver
can drive at preferred speeds in a range of approxi
-
mately 40 to 200 km/h (25 to 125 mph) without
depressing the accelerator pedal.
For this auto-cruise control system, in conjunction
with the electronic throttle valve control system, the
engine control module (ECM) electronically controls
the throttle valve.
CONSTRUCTION DIAGRAM
AC505671AB
Accelerator pedal assembly
[Built-in accelerator pedal position
sensor (APP sensor)]