Mitsubishi Evolution X. Manual - part 54

BASE ENGINE

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ENGINE

11-14

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
mark

Thickness

AD

AK503014

Exhaust V.V.T. sprocket

Section A-A

Section B-B

Engine oil control
valve filter

Intake V.V.T. sprocket

Cylinder head

Cylinder block

B

B

Engine oil
control valve

Cylinder head

Cylinder block

A

A

AE

Engine oil
control valve

BASE ENGINE

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ENGINE

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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.

AK503061

Timing mark

Vane housing

Vane housing

Sprocket

Sprocket

Retard oil chamber

Retard 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
bolt

Vane
bushing

Vane bushing

Spring

Intake V.V.T. sprocket

Exhaust V.V.T. sprocket

Timing mark

AD

BASE ENGINE

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ENGINE

11-16

CAMSHAFTS

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.

AK502506

Intake camshaft

Exhaust camshaft

Retard
oil channel

Retard
oil channel

Advance
oil channel

Advance
oil channel

Dowel pin

Hollow section

Sealing cap

Cam positon
sensing cam

AD

Item

Specifications

Overall length mm (in)

Intake

435.00 (17.126)

Exhaust

438.27 (17.255)

Journal outer diameter mm (in)

Intake

No.1

30 (1.2)

No.2 

− 5

24 (0.9)

Exhaust

No.1

36 (1.4)

No.2 

− 5

24 (0.9)

Camshaft lift mm (in)

Intake

9.3 (0.37)

Exhaust

8.2 (0.32)

BASE ENGINE

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ENGINE

11-17

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.

TIMING CHAIN CASE

The timing chain case is made of an aluminum alloy. 
A front crankshaft oil seal is press-fit into the case.

AK302997AE

Spring guide

Valve sleeve

Plunger spring

Spool

O-ring

Insulation
coilar

Stator

Guide cap

Bracket

Yoke

Seal cap

Plunger

Shaft

Terminal

Bobbin

Tape

Enameled
copper wire

Drain

Drain

Pump

Pressure
chamber

Default
pressure
chamber

AK502507

Oil seal

AD

Timing chain case