2008 MITSUBISHI LANCER EVOLUTION X engine

BASE ENGINE
ENGINE MECHANICAL11A-11
FLYWHEEL
A cast iron ring gear is a shrink fit in the iron casting
of the flywheel.
The flywheel is mounted with 7 bolts.
TIMING CHAIN TRAIN
The two camshafts are driven by the timing chain via
the camshaft sprockets.
The timing chain is a silent, endless type, consisting
of 180 links. It is installed around the V.V.T. sprockets
and the crankshaft sprocket.
Three (orange) mark link plates are installed on the
timing chain to locate the sprockets.
AK603618AB
Ring gear
AK502497
Timing mark
link plate (orange)Timing mark
Timing mark
link plate (orange)
Intake V.V.T. sprocket
Chain guide
Crankshaft spocket
Cranshaft spocket
timing mark
Timing mark
link plate (orange) Exhaust V.V.T. sprocket
Tensioner lever
Timing chain
tensioner
AD
ItemNumber of teeth
V.V.T. sprockets54
Crankshaft sprocket27

BASE ENGINE
ENGINE MECHANICAL11A-12
TIMING CHAIN TENSIONER
The tensioner maintains the tension of the timing
chain. It contains a piston with a built-in spring.
With the tensioner installed, its piston directly pushes
on the tension lever in order to automatically adjust
the tension of the timing chain.
VA LV E T R A I N
The valve train is the 4-valve, double overhead cam-
shaft (DOHC) type in which the camshafts are
located above the valves.
Two intake and exhaust valves for each cylinder are
arranged in a V shape.
A valve tappet is interposed between the camshaft
and each valve, which allows the valve to open and
close.
AK502997
SpringPiston
AE
Rack and
washer
assembly
AK502499
Exhaust
camshaftIntake
camshaft
Valve tappet
Intake valve
Exhaust valve
AD

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

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