Mitsubishi Evolution X. Manual - part 53

 

  Index      Mitsubishi     Mitsubishi Evolution X - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  51  52  53  54   ..

 

 

Mitsubishi Evolution X. Manual - part 53

 

 

BASE ENGINE

TSB Revision

ENGINE

11-10

CRANKSHAFT PULLEY

The pulley is made of cast iron.
The pulley portion has grooves for the V-ribbed belt 
(with 6 crests).
The flange portion of the pulley has a timing mark 
notch for checking the ignition timing.

A torsion damper has been adopted to reduce the 
torsional vibration of the crankshaft, as well as to 
dramatically reduce noise and vibration in the 
high-speed range.

FLYWHEEL

The cast iron ring gear is shrunk fit into the carbon 
steel flywheel of M/T and is shrunk fit into the cast 
iron flywheel of TC-SST respectively. The flywheel 
hub is installed to the TC-SST.

Item

Specifications

Crankshaft bearing

Width mm 
(in)

18 (0.7)

Thickness 
mm (in)

2.0 (0.08)

Crankshaft thrust 
bearing

Thickness 
mm (in)

2.0 (0.08)

AK604551

Timing mark

Rubber

AB

AK703232

<M/T>

<TC-SST>

AC

Flywheel bolt

Flywheel bolt

Flywheel

Flywheel

Flywheel hub

BASE ENGINE

TSB Revision

ENGINE

11-11

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 (blue) mark link plates are installed on the tim-
ing chain to locate the sprockets.

.

TIMING CHAIN MAINTENANCE

When the vehicle equipped with 4B11-T/C continues 
the severe driving conditions like the competition

*1

the amount of carbon mixed into the engine oil tends 
to increase. This might cause the timing chain to 
gradually extend. To prevent this, the engine-ECU 
has the function or logic to monitor the amount of tim-
ing chain extended.
NOTE: 

*1

:Driving to fully depress and fully release 

the accelerator pedal repeatedly all the time.

AK502497

Timing mark
link plate (blue)

Timing mark

Timing mark
link plate (blue)

Intake V.V.T. sprocket

Chain guide

Crankshaft spocket

Cranshaft spocket
timing mark

Timing mark
link plate (blue)

Exhaust V.V.T. sprocket

Tensioner lever

Timing chain
tensioner

AK

Item

Number of teeth

V.V.T. sprockets

54

Crankshaft sprocket

27

BASE ENGINE

TSB Revision

ENGINE

11-12

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.

VALVE TRAIN

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

Spring

Piston

AE

Rack and 
washer
assembly

AK502499

Exhaust
camshaft

Intake
camshaft

Valve tappet

Intake valve

Exhaust valve

AD

BASE ENGINE

TSB Revision

ENGINE

11-13

VALVES

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.

VALVE SPRINGS

To prevent the engine from surging at high speeds, 
unequal-pitch springs are used.

AK502500

L

L

D

d

d

D

AD

Intake

Exhaust

Item

Intake valve

Exhaust 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

Item

Specifications

Free height (h) mm (in)

51.5 (2.03)

Total number of windings 8.35

 

 

 

 

 

 

 

Content   ..  51  52  53  54   ..