lock MITSUBISHI COLT 2006 Service User Guide

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-21
CYLINDER BLOCK
AK402339AC
Front view
Right side view
Under view
Top view
Rear view
Left side view
Thermostat case installation positionOil filter bracket installation position Front
Front Front Front
Nipple
The cylinder b
l ock is ma de of ligh twe i ght aluminum
allo
y .
The crankshaf t jo urnal is supp orted b y 5 b earing s .
The crankshaf
t thru st load is supporte d by No . 4
bearin
g.
The water jacket is of a full-siamese de sig n .
A nipple is p r ovid ed at the fr o n t of the block to su pply
engin
e oil onto the timin g ch ain.
ItemDimension
Overall height mm280
Overall length mm375.1
Top face to crankshaft
center mm205
Crankshaft center to
bottom face mm75
Bore mm75
Bore pitch mm83
Stroke mm84.8

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-25
CRANKSHAFT
AK305068AD
Oil pump drive
gear shaft
Crankshaft
sprocket
Crankshaft sensing ring
CrankshaftOil hole
Oil hole
Balance weightBalance weightBalance weight
A casted crankshaf
t is used for t he cr ankshaf t.
The crankshaft consist s o f 5 ma in be aring s an d 8
balan
ce weight s.
The crankshaft pins a r e arrang ed at 1 8 0° inte rval s.
The oil hole supply lu brication oil from t he jo urnal to
the crank p
i n.
A cranksha f t sprocket and an oil pump drive gea r
shaf
t are press-fit t ed on to the f r ont of the crankshaf t.
The crankshaft is also fitt ed with a crankshaf t sens-
ing ring.
CRANKSHAFT BEARING, THRUST BEARING
AK305070
Upper bearingOil groove
Oil hole
Identification
color
Lower bearing
Identification
color
AB
Thrust bearing
Groove
Front
The upp er cra n kshaf t bea ring (with oil groove) is
loca
ted on the cylinder block side wh ile the lo we r
bearin
g (witho ut oil groo ve) is he ld by the b earin g
cap.
The crankshaft bea ring is e quipp ed with back me t a l.
While the b
earin g it self is ma de of a l uminum alloy ,
the back met
a l is no rmally made of steel sheet .
A thrust bearing is inst alle d on b o th sides of th e No.
4 cran
kshaf t bearing.
ItemDimension
Crankshaft
bearingWidth mm16
Thickness mm20
Crankshaft
thrust bearingThickness mm3.275

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-28
TIMING CHAIN TRAIN
AK305075
V.V.T. sprocket
AB
V.V.T. sprocket
timing mark
Timing chain mark
link plate (bule)
Camshaft sprocket
Camshaft sprocket
timing mark Timing chain mark
link plate (bule)
Timing chain mark
link plate (bule)
Crankshaft
sprocket
timing mark
Crankshaft sprocket
Timing mark
Timing chain
tensioner
Tensioner lever
Chain guide
Timing mark
The 2 camshaf
t s are driven by the t i ming chain via
the res
pec tive spro cke t s .
The timing cha i n, consist i ng o f 122 links, is an end-
less chain, conn ecting the cran ksh af t spro cke t with
the camshaf
t and V . V . T . spro cke t s .
The timing cha i n is eq uippe d with 3 mark link p l ates
(blue)
to co rrectly time t he 3 sprocket s with each
other
.
ItemNo. of
teeth
Camshaft sprocket36
V.V.T. sprocket36
Crankshaft sprocket18
TIMING CHAIN TENSIONER
AK305388AB
Retainer
Ball
Coil spring 1
Ball sheet
Coil spring 2
Cam
Pin
Plunger
The timing chain is tensione
d by th e timing chain te n-
sioner , which ha s a b u ilt-in plunge r with plunge r
springs.
The plunger in the timing chain tension e r dire ctly
push
e s th e tension lever , and the pre s sure aut omati
-
cally ad just s the timing chain tension.
A cam is provided t o lock th e plu nger in pla c e a f te r
the eng
ine stop s. This help s prevent the timing chain
from wob
b lin g just af ter th e eng ine st a r t s .
With the timing cha i n ten s io ner in st alled, do not
crank the
engin e in the reverse directio n. This will
force
the plunger to overcome the cam, or e v en
cause oth
e r problems.

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-31
MIVEC (MITSUBISHI INNOVATIVE VALVE TIMING ELECTRONIC CONTROL SYSTEM)
AK300856AD
A
A
A-A
Oil feeder control valve
Oil feeder
control
valve filter
Oil feeder
control
valve filter
bolt
Cylinder head
Cylinder block
V.V.T.sprocket
M I VEC (Mit su bis h i Inn o va tive V a lve tim i ng Elect r o n ic
Con
t rol system) consist s of th e compon ent s illus
-
trated above .
The int a ke valve timing is optimally controlled (con-
tinuously variable) un der the chan ging driving condi-
tions to improv e po we r in th e entire sp eed ra nge.
V. V . T . SPROCKET (V ARIABLE V A L V E TIMING SPROCKET)
AK300857
Vane bushing
AB
SprocketVane roter
V.V.T.sprocket
bolt
Timing mark
Vane housing
Advance oil chamber
Retard oil chamber
Stopper pin
Oil from the oil fe
eder control valve is sent t o the
V
. V . T . sp rocket, moving the vane roto r and thus reg u
-
lating the valve timing.

GENERAL INFORMATION
ENGINE LUBRICATION12-2
GENERAL INFORMATION
M2120000100175
LUBRICATION SYSTEM SCHEMATIC<4A9>
AK402024AC
Oil screenOil pump
Timing chain case
oil passage
Cylinder block
oil passage(right side) Oil filter
Relief valve
Cylinder block
oil passage
(main gallery)Crankshaft
journal
Exhaust camshaft
journal
Oil pressure switch
Cylinder head
oil passage
No.1 Camshaft
journal
Intake camshaft
journal Crankshaft
pin
The lu
brication system of th e 4A9 en gine has a full
pressure de
livery system and a full flow oil filtering
system. The o
il stored in the oil p an is pumped
up/out
by th e oil pump. Af ter the relie f valve regu
-
lates the oil p r essure, th e oil is delivere d to th e cylin-
der block through the o il f ilte r , the o il p a ssag e of the
cylinde
r blo ck a nd the each jou r nal o f the crankshaf t.
The oil del ivered to the ea ch jo urnal of th e cranksh af t
is supplied
to the pin th rough the in ner p a ssage of
the crankshaf
t.
The oil delivered to the cylinder head is supplied t o
the ea
ch journa l of the camshaf t th rough the cylinde r
head.

GENERAL INFORMATION
ENGINE LUBRICATION12-3
LUBRICATION SYSTEM SCHEMATIC<4G1>
AK402151AC
Oil screen
Oil pump
Oil filter
Relief valve
Cylinder block
oil passage
(main gallery)Crankshaft
journal
Exhaust camshaft
journal
Oil pan Oil pressure switch
Cylinder head
oil passage
No.1 Camshaft
journal
Intake camshaft
journal Crankshaft pin
PistonOil jet
Oil cooler
Turbo charger
Lash adjuster Cam
To correspond with the impr oved engine outp u t per-
formance b y emplo y ing the tu rboch a rger , the oil
cooler and
the oil jet are u s ed for 4GI engine.

OIL SCREEN<4A9>
ENGINE LUBRICATION12-5
OIL SCREEN<4A9>
M2120004000039
AK305372AB
Timing chain case
Oil pan
Oil screen
The oil screen is located in the po sition with the lea s t
disturbance to
the oil suction vo lume that result s
from oil
level variat ion in the oil p an while the vehicle
is d
r ive n .
OIL FIL T ER<4A9>
M21200050 0003 2
AK401817AE
Oil filterOil filter
bracket
AK305373
AB
Element
Oil filter
The oil filter is inst alled to the oil filter b r acket
att
a che d to the cylin der block.
ItemSpecification
Filtering methodFull-flow filtering, Paper
element
Filtration area cm2750
Rated flow L/min.25

OIL COOLER<4G1>
ENGINE LUBRICATION12-7
OIL COOLER<4G1>
M2120008000020
AK402142
Oil outletOil inlet
To cylinder block
From oil filter
Coolant inlet
(from throttle body)
Coolant outlet
(to water inlet pipe)
Oil cooler boltOil cooler
AC
An
oil cooler is used for the vehicle wit h a turb o-
charge r to improve the per formance of cooling lubri-
cant.
By circulating the coolant an d the o il within t he oil
cooler
, he at is exchang ed an d the o il is coole d .

GENERAL INFORMATION
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-3
SYSTEM BLOCK DIAGRAM
AK600486
Barometric pressure sensorThrottle valve control servo
Manifold absolute pressure
sensor
Engine coolant
temperature sensor
No.1 injector
No.2 injector
No.3 injector
No.4 injector
No.1 Ignition coil
No.2 Ignition coil
No.3 Ignition coil
No.4 Ignition coil
Engine control relay
Throttle valve control servo relay
A/C compressor relay
Fuel pump relay
Alternator G terminal
Cooling fan control relay
Purge control solenoid valve
Diagnostic output terminal
Intake air temperature sensor
Accelerator pedal
position sensor (main) Throttle position sensor (sub)
Camshaft position sensor
Crank angle sensor
Oxygen sensor (front)
Oxygen sensor (rear)
Alternator FR terminal
Inhibitor switch
Detonation sensor
Ignition switch-IG
Ignition switch-ST
Stop lamp switch
Power supply
Accelerator pedel
position sensor (sub) Throttle position sensor (main)
Throttle valve control unitEngine control unit
Engine-ECU or
Engine-CVT-ECU
Throttle opening feedback control Oxygen sensor heater (front)
Oxygen sensor heater (rear)
[1] Fuel injection control
[2] Throttle valve opening control
and idle speed control
[3] MIVEC (Mitsubishi Innovative
Valve timing Electronic
control system)
[4] Ignition timing control
[5] Engine control relay control
[6] Throttle valve control servo
relay control
[7] Fuel pump relay control
[8] Oxygen sensor heater
control
[9] Fan relay control
[10] A/C compressor relay
control
[11] Alternator control
[12] Purge control
[13] EGR control
[14] Diagnostic output
[15] RAM data transmission
Oil feeder control valve
(for MIVEC)
EGR valve
(Stepper motor)
AB

GENERAL INFORMATION
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-7
Throttle position sensor This sensor detects the position of the throttle valve
and inputs it into the engine-ECU or
engine-CVT-ECU . Based on the voltage that
is output by this sensor, the engine-ECU or
engine-CVT-ECU effects throttle valve
feedback control.
Accelerator pedal position sensor This sensor detects the position of the accelerator
and inputs it into the engine-ECU or
engine-CVT-ECU . Based on the voltage that
is output by this sensor, which determines the
accelerator position (and the intention of the driver),
the engine-ECU or engine-CVT-ECU
effects appropriate fuel injection and throttle valve
position controls.
Camshaft position sensorThis sensor detects the top-dead-center (TDC) of the
compression stroke of each cylinder.
Crank angle sensorThis sensor detects the crank angle and inputs it into
the engine-ECU or engine-CVT-ECU .
The engine-ECU or engine-CVT-ECU
effects injector control and other controls in
accordance with the signals received from this
sensor.
Detonation sensorThis sensor, which contains a piezoelectric element,
detects the vibration of the cylinder block that results
from knocking. The engine-ECU or
engine-CVT-ECU detects only the knocking
of the engine from these vibrations, in order to retard
the ignition timing in accordance with the strength of
the knocks.
Alternator FR terminalThis terminal is used for detecting the duty cycle ratio
that energizes the alternator field coil.
Inhibitor switch This is a contact point type switch that inputs a signal
into the engine-CVT-ECU to determine whether the
shift lever is in the neutral position.
Stop lamp switchThis is a contact point type switch that detects how
the brake pedal is depressed.
Actuators
Engine control relayThis relay turns ON and OFF the engine-ECU
or engine-CVT-ECU power circuit.
Throttle valve control servo relayThis relay turns ON and OFF the actuation power
circuit for the throttle valve control servo in the
engine-ECU or engine-CVT-ECU .
InjectorThe injectors inject fuel in accordance with the
injection signals received from the engine-ECU
or engine-CVT-ECU .
Ignition coil (with power transistor)Applies ignition coil primary current intermittently in
accordance with the ignition signals received from
the engine-ECU or engine-CVT-ECU ,
in order to generate high voltage for ignition.
Name Function