engine MITSUBISHI COLT 2006 Service Service Manual

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-30
VALVE STEM SEAL
AK305079AB
Valve stem seal
The valve stem seal e m ploys springs to enh ance
sealing p
e rformance , min i mi zing oil p a ssing do wn to
the por
t.
VALV E S P R I N G
AK300721AB
h
The valve spri ng h a s a dual pitch sp ring to prevent
surging in the h
i gh speed range .
ItemSpecification
Free length mm43.1
No. of spring turns8.49
VA L V E T A PPET
AK300722AB
Thickness
Identification mark
Va lve t app et s are avai lable in 31 th ickne sses, at 0. 02
mm
intervals betwee n 2.70 mm and 3 . 30 mm, to
ensu
r e co rrect valve clearan ce.

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.

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-32
CAMSHAFT
AK304999
Intake camshaft
Exhaust camshaft
AB
Hollow section
Advance
oil channel
Retard
oil channel
Cam positon sensing ring
Dowel pinSealing cap
The lightweight camshaf t is ach i eved by the h o llo w
design.
Oil channels run through the int a ke camshaf t,
through
wh ich oil is sent from t he oil fee der co ntrol
valve to
the V . V . T . sprocket.
A cam position sen s in g ring is press-fitt ed onto the
rear port
i on o f the int a ke camshaf t.
ItemDimension
Overall length
mmIntake407.5
Exhaust361.9
Journal mm26
Valve lift mmIntake8.4
Exhaust7.9
OIL FEEDER CONT ROL V A L V E(OCV)
AK302997AB
Spring guideValve sleeve
Plunger spring Spool
O-ring
Insulation coilar
StatorGuide cap Bracket
Yo k eSeal cap
Plunger
Shaft Terminal
Bobbin
Tape
Enameled copper wire
Drain
Drain
Pump
Pressure
chamber
Default
pressure
chamber
The oil fee
der co ntrol valve is essen t ially a solenoid
valve, re
gulat ed by the en gine -ECU or
engin
e -A-M/T -ECU signals to feed o il to the V . V . T .
sprocket
assemb ly t o move the van e rotor .

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-33
TIMING CHAIN CASE
AK305243
Engine support bracket
AB
The engine supp ort bracket, the oil pu mp a nd the
relie
f valve are in tegrate d as we ll as water chamber
of the wat
e r pump.

GROUP 11
ENGINE
CONTENTS
ENGINE MECHANICAL <4A9> . . . . . . . . . . . . . . . . . . . . . . . . .11A
ENGINE MECHANICAL <4G1> . . . . . . . . . . . . . . . . . . . . . . . . .11B

GROUP 12
ENGINE
LUBRICATION
CONTENTS
GENERAL INFORMATIO N . . . . . . . .12-2
OIL PUMP<4A9> . . . . . . . . . . . . . . . .12-4
RELIEF VALVE<4A9> . . . . . . . . . . . .12-4
OIL SCREEN<4A9> . . . . . . . . . . . . . .12-5
OIL FILTER<4A9> . . . . . . . . . . . . . . .12-5
OIL PAN<4A9> . . . . . . . . . . . . . . . . . .12-6
OIL LEVEL GAUGE, OIL FILLER CAP,
OIL DRAIN PLUG<4A9> . . . . . . . . . .12-6
OIL COOLER<4G1> . . . . . . . . . . . . . .12-7

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 PUMP<4A9>
ENGINE LUBRICATION12-4
OIL PUMP<4A9>
M2120002000044
AK305367AB
Timing chain caseOil pump
inner rotor
Oil pump
outer rotor Oil seal
Cover
Machine screw
A
A-A
A
The oil pump is of a
cyclo i d type, d i rectly driven by
the crankshaf
t.
On the cycloid o il p u mp, as th e inn e r rotor is ro t a ted
by th
e cran kshaf t, the o u ter rot o r also rot a tes. The
result
a n t ch ange in sp at ial volu mes betwee n the
rotors
genera t es p u mping action .
Sp e c ifically , o il is sucked into the exp and ing sp ace
and is pushed
out from the shrinking sp ace.
ItemSpecification
Ty p eCycloid pump
No. of lobesInner rotor10
Outer rotor11
Displacement L/min(6,000 r/min.)35
RELIEF V A L V E<4A9>
M21200030 0004 7
AK305369AB
Plug
A-A
A A
Relief spring
Relief plunger
Timing chain case
The relief valve is of a
plun ger type. The valve re gu-
lates the maximum pre ssu re of lubricatio n oil being
sent
to the e ngin e .
When the pressure of oil from the oil p u mp exceeds
the specified
value, the valve o pens to relieve the
excess flow
.
The excess o il is ret u rned t o the suct ion side of the
oil pump
.

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