spark plug MITSUBISHI COLT 2006 Service Repair Manual

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-3
BASE ENGINE
M2112001000864
CYLINDER HEAD
AK305050AB
Spark plug guide
Intake
side
Exhaust
side
Valve guide
The cylinder head is made of aluminu m alloy , which
is light
we ight a nd ha s an excelle nt co oling ef ficiency .
The pentroof type comb ustion chamb e r has a sp a r k
plug in the
cent er . The valve an gle is relatively small,
contributing to size redu
ctio n.
The int a ke an d exhaust port s a r e arrang ed in a
cross-flow construction.
Ea ch cylinde r has a p a ir of
int
a ke port s on one side and a p a ir of e x hau st po rt s
on the
other side .
Each o f the int a ke a nd exhaust ca msh a f t s is sup-
ported by 5 bearin gs. On ea ch camshaf t, th e thrust
load
is suppo rted by No. 1 b earin g. The No . 1 bea r
-
ings for the int a ke and exha ust camshaf t s ha ve a
common bearing
ca p.
VALV E S E AT
AK305052
d
AB
d
DD h
h
Intake
Exhaust
Sintered
alloy valve seat
ItemIntakeExhaust
D (Outer
diameter) mm31.528
d (Inner
diameter) mm2622
h (height) mm6.67.3

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-13
VALVE MECHANISM
AK305076AB
Exhaust valveIntake valve
Exhaust camshaft
Intake camshaft
Spark plug guide
Valve tappet
The valve mechanism is based on a 4-va lve DOHC
(Do
uble Over Head Camsha f t ) d e sign having the
camshaf
t on the u pper valve. Each cylin der has 2
int
a ke valves and 2 exh aust valves, arrang ed in a
V
- shape p a ttern.Camsh a f t rot a tion is transmitte d via va lve t a ppet s to
the respective
valves which ope n and close accord
-
ingly.
VALV E
AK305078
d
d
DD
L
Intake
Exhaust
L
AB
The valves ha ve h eat-resist an ce. Th e entire valve
surface is trea
ted with gas nitriding.ItemIntake valveExhaust valve
Head diameter
mm30.525.5
Stem diameter
mm5.05.0
Overall length
mm89.6190.94

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-19
BASE ENGINE
M2112001000875
CYLINDER HEAD
AK305050AB
Spark plug guide
Intake
side
Exhaust
side
Valve guide
The cylinder head is made of aluminu m alloy , which
is light
we ight a nd ha s an excelle nt co oling ef ficiency .
The pentroof type comb ustion chamb e r has a sp a r k
plug in the
cent er . The valve an gle is relatively small,
contributing to size redu
ctio n.
The int a ke an d exhaust port s a r e arrang ed in a
cross-flow construction.
Ea ch cylinde r has a p a ir of
int
a ke port s on one side and a p a ir of e x hau st po rt s
on the
other side .
Each o f the int a ke a nd exhaust ca msh a f t s is sup-
ported by 5 bearin gs. On ea ch camshaf t, th e thrust
load
is suppo rted by No. 1 b earin g. The No . 1 bea r
-
ings for the int a ke and exha ust camshaf t s ha ve a
common bearing
ca p.
VALV E S E AT
AK305052
d
AB
d
DD h
h
Intake
Exhaust
Sintered
alloy valve seat
ItemIntakeExhaust
D (Outer
diameter) mm31.528
d (Inner
diameter) mm2622
h (height) mm6.67.3

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-29
VALVE MECHANISM
AK305076AB
Exhaust valveIntake valve
Exhaust camshaft
Intake camshaft
Spark plug guide
Valve tappet
The valve mechanism is based on a 4-va lve DOHC
(Do
uble Over Head Camsha f t ) d e sign having the
camshaf
t on the u pper valve. Each cylin der has 2
int
a ke valves and 2 exh aust valves, arrang ed in a
V
- shape p a ttern.Camsh a f t rot a tion is transmitte d via va lve t a ppet s to
the respective
valves which ope n and close accord
-
ingly.
VALV E
AK305078
d
d
DD
L
Intake
Exhaust
L
AB
The valves ha ve h eat-resist an ce. Th e entire valve
surface is trea
ted with gas nitriding.ItemIntake valveExhaust valve
Head diameter
mm30.525.5
Stem diameter
mm5.05.0
Overall length
mm89.6190.94

IGNITION TIMING AND DISTRIBUTION CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-11
IGNITION TIMING AND DISTRIBUTION CONTROL
M2132005000750
This control system is basically the same as that of
the 4G1-Non-Turbo engine used in the COLT.
System Configuration Diagram
AK402031
Ignition switch-IG
Ignition
coil Battery
Spark plug
Cylinder No. 1 2 3 4
Manifold absolute
pressure sensor
Intake air temperature sensor
Barometric pressure sensor
Engine coolant
temperature sensor
Camshaft position sensor
Crank angle sensor
Detonation sensor
Ignition switch-ST
Engine-ECU
or Engine-
CVT-ECU
AG
OTHER CONTROL FUNCTI O NS
M21320100 0059 6
The following co ntrols are b a sically t he sa me a s
those
of the 4G1 - No n
−turbo eng ine u s ed in the
CO
L
T
.
•ENGINE CONTROL RELA Y CONTROL
•THROTTLE VA L V E C O NTROL SER VO R E LA Y
CONTROL
•MIVEC (Mitsub i sh i Inno vative V a lve T i ming Elec-
tronic Con t rol System)
•FUEL PUMP RELA Y CONTROL
•OXYGEN S E NSOR HEA T E R CONTR O L
•A/C RELAY CONTROL
•ALTER N A T OR CONTROL

IGNITION TIMING AND DISTRIBUTION CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-9
IGNITION TIMING AND DISTRIBUTION CONTROL
M2132005000761
This control system is basically the same as that of
the 4G1-Non-Turbo engine used in the COLT.
System Configuration Diagram
AK402031
Ignition switch-IG
Ignition
coil Battery
Spark plug
Cylinder No. 1 2 3 4
Air flow sensor
Intake air temperature sensor
Barometric pressure sensor
Engine coolant temperature
sensor
Camshaft position sensor
Crank angle sensor
Detonation sensor
Ignition switch-ST
Clutch switch
Engine-
ECU
AH

GENERAL INFORMATION
ENGINE ELECTRICAL16-2
GENERAL INFORMATION
M2160000100038
The electronic device is basically the same as that in
the conventional 4G1 engine.
The employed alternator is a lightweight type in
which the electronic voltage regulator for detecting
the battery voltage is built.
The employed starter motor is a small planetary gear
reduction drive type.
The employed spark plug is a long reach type with
iridium.
The employed ignition coil is a plug top type in which
the powertrain per cylinder is built.