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
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