MITSUBISHI COLT 2006 Service Service Manual

EXHAUST SYSTEM
INTAKE AND EXHAUST15-5
EXHAUST SYSTEM
EXHAUST MANIFOLD <4A9>M2150006000317
AK402037
Pipes
AD
The exhaust manifold co nsist s of st ain l ess st eel
pipes, with
all the po rt s bein g equa l in leng th, to
achieve
robust mid-range torque and weight red u c
-
tion.

EXHAUST SYSTEM
INTAKE AND EXHAUST15-6
TURBOCHARGER <4G1>
M2150009000123
AK402141
Cons id ering the ba lance among t he eng ine o u tput,
the response and
the amount of the exha ust g a ses,
the opt
imized size is used .

EXHAUST SYSTEM
INTAKE AND EXHAUST15-7
EXHAUST PIPE AND MUFFLER <4A9>
M2150003000642
CONSTRUCTION DIAGRAM
AC601362AB
Centre exhaust pipeExhaust main muffler
Front exhaust pipeAnnular joint
Under floor catalytic converter

Exhaust pre-muffler
Insertion joint
AC601363AB
Centre exhaust pipeExhaust main muffler
Front exhaust pipeAnnular joint
Under floor catalytic converter

Exhaust pre-muffler
Insertion joint
Exhaust pipe consisting of th ree sep a ratio n system:
front exhaust pipe,
centre e x hau st pip e , and exhaust
main muf
f ler , has the fo llowing fea t ures:
•An exhaust pre-muff ler ha s be en in st alled to th e
ce
ntre exhaust pipe in order t o reduce exhaust
noise.
•An insertion joint has b een a dopted for the con-
nection between the centre exha ust p i pe and the
exhaust ma
in muf f ler to save the weight of the
exhaust system.
•The under floor cat a lytic con v erter has been
moved
clo s er to the e ngine side to impro v e
exhaust gas perfo
rmance.
•An annula r joint has been adopt ed for th e co n-
nection between the exhau st manifo ld an d the
fron
t exh aust pipe to redu ce th e exhaust pipe 's
vibration from the
engine side.

EXHAUST SYSTEM
INTAKE AND EXHAUST15-8
EXHAUST PIPE AND MUFFLER <4G1>
M2150003000653
CONSTRUCTION DIAGRAM
AC601366AB
Centre exhaust pipeExhaust main muffler
Front exhaust pipe
Under floor
catalytic converter
Exhaust pre-muffler
Front
catalytic
converter
Insertion joint
Annular joint
Exhaust pipe co
nsisting of th ree sep a ratio n system:
front exhaust pipe,
centre e x hau st pip e , and exhaust
main muf
f ler , has the fo llowing fea t ures:
•An exhaust pre-muff ler ha s be en in st alled to th e
ce
ntre exhaust pipe in order t o reduce exhaust
noise.
•An insertion joint has b een a dopted for the con-
nection between the centre exha ust p i pe and the
exhaust ma
in muf f ler to save the weight of the
exhaust system.
•An annula r joint has been adopt ed for th e co n-
nection between the fro n t exhaust pip e and the
fron
t cat a lytic co nvert e r has been adopt ed to
redu
ce vibra t ion from th e eng ine side .
•A front cat a lytic co nvert e r and an und er floo r cat-
alytic conver ter have bee n adop ted to imp r ove
exhaust gas perfo
rmance.

GROUP 11B
ENGINE
MECHANICAL
<4G1>
CONTENTS
GENERAL INFORMATIO N . . . . . . . .11B-2BASE ENGINE . . . . . . . . . . . . . . . . . .11B-3

GENERAL INFORMATION
ENGINE MECHANICAL <4G1>11B-2
GENERAL INFORMATION
M2112000101010
The 4G15-MIVEC-T/C engine employed in the Colt
is designed to provide higher performance and
higher output by using a turbocharger to the
4G15-MIVEC engine employed in the conventional
Colt. The main changes in the conventional
4G15-MIVEC engine are as follows:•Cylinder head gasket changed
•Oil jet added
•Strength improved in piston and piston pin
MAJOR SPECIFICATIONS
Item4G15-MIVEC-T/C
Total displacement mL1,468
Bore × Stro ke mm75 × 82.0
Compression ratio9.0
Compression chamberPentroof-type
Va l v e t i m i n gIntake openingBTDC 34° − AT D C 6°
Intake closingABDC 30° − ABDC 70°
Exhaust openingBBDC 50°
Exhaust closingATDC 10°
Maximum output kW (PS)/rpm113 (154)/6,000
Maximum torque N⋅m (kg⋅m)/rpm210 (21.4)/3,500
Fuel systemElectronically controlled multipoint fuel injection
Ignition systemElectronic-controlled 4-coil

BASE ENGINE
ENGINE MECHANICAL <4G1>11B-3
BASE ENGINE
M2112001000886
CYLINDER HEAD GASKET
AK402138
A
AC
AA-A
To co rrespo nd wi th the imp r ove d o u t put pe rfo r ma nce
by emplo
y in g the t u rbocharger , a three layer me t a l
gasket is used.
CYLINDER BLOCK
AK402048AC
Oil jet
The cylinder bl ock has the oil jet fitted o n the main
bearin
g among th e cylin ders in ord e r to make the
pist
on cool. T he oil is injecte d from the o il g r oove of
the main b
earin g when th e oil pressure is 2kg/ cm
2 or
more.

BASE ENGINE
ENGINE MECHANICAL <4G1>11B-4
PISTON
AK403411
Frontview
Under view
A-AB -B
A
A B
B
AB
T
o co rrespo nd wi th the imp r ove d o u t put pe rfo r ma nce
by emplo
y in g the t u rbocharger , the strength is
imp
r oved in th e piston b ody .
PISTON PIN
AK403412
56
Ø8
Ø18
23.523.5 9
AB
T o co rrespo nd wi th the imp r ove d o u t put pe rfo r ma nce
by emplo
y in g the t u rbocharger , the strength is
imp
r oved in th e piston p i n.

GROUP 11A
ENGINE
MECHANICAL
<4A9>
CONTENTS
GENERAL INFORMATIO N . . . . . . . .11A-2
BASE ENGINE . . . . . . . . . . . . . . . . . .11A-3
GENERAL INFORMATION. . . . . . . . .11A-18
BASE ENGINE . . . . . . . . . . . . . . . . . .11A-19

GENERAL INFORMATION
ENGINE MECHANICAL <4A9>11A-2
GENERAL INFORMATION
M2112000100697
The newly developed 1.5L 4A91 engine features
4-cylinder, 16-valve, and double overhead camshafts
(DOHC).
The engine has the following features.
•Aluminum cylinder block
•MIVEC (Mitsubishi Innovative Valve timing Elec-
tronic Control system)
•Selective valve tappet of direct acting valve sys-
tem for valve clearance adjustment
•Timing chain
MAJOR SPECIFICATIONS
Item4A91
Total displacement mL1,499
Bore × Stro ke mm75 × 84.8
Compression ratio10.0
Compression chamberPentroof-type
Va l v e t i m i n gIntake openingBTDC 31° − AT D C 1 9°
Intake closingABDC 21° − ABDC 71°
Exhaust openingBBDC 39°
Exhaust closingATDC 5°
Maximum output kW (PS)/rpm77 (104)/6,000
Maximum torque N⋅m (kg⋅m)/rpm141 (14.4)/4,000
Fuel systemElectronically controlled multipoint fuel injection
Ignition systemElectronic-controlled 4-coil