2006 MITSUBISHI COLT engine oil

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-22
REAR OIL SEAL CASE
AK305061AB
AA A-A
The rea
r oil seal ca se is a sheet -met al wor k . The
case is
inst alled with sealant ap plie d onto th e mou n t
-
ing face to prevent oil leaka ge.
PISTON
AK403222
AB
Front mark
Piston pin offset
The pisto n is made of spec ial a l uminu m all o y . W e ig ht
reduction
is a c hieved by minimizin g the o v erall
heigh
t while maximizing th e recess on bo th end s of
the piston
pin.
The center o f the p i sto n pin hole is of fset by 0.5 mm
from t
he ce nter of the piston towards the th rust side .
The piston skirt ha s a streak finish to enha nce oil
retention an
d anti-seizin g prope rty .
ItemDimension
Base diameter mm75
Pin diameter mm18
Overall height mm46.04
PISTON PIN
AK305064
d
AB
D
h
The piston pin is o f a semi-floating type, p r ess-fitte d
into t
he co nnecting rod small end wh ile cap able of
floating re
lative to the piston .
ItemDimension
D (Outer diameter) mm18
d (Inner diameter) mm11
h (Overall length) mm50

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-23
PISTON RING
AK305365AB
Piston ring No.1
Spacer RailMaker mark
Piston ring No.2
Oil ring Piston ring No.1
Piston ring No.2
Oil ring
Ea ch pisto n is provided with No. 1 and No. 2 com-
pression rings and an oil rin g .
ItemNo. 1 piston ringNo. 2 piston ringOil ring
ShapeBarrelUndercut3-piece
Surface treatment (Contact
face with cylinder)Ion platingParkerizedIon plating
Maker markNo mafking2RNo marking

BASE ENGINE
ENGINE MECHANICAL <4A9>11A-24
CONNECTING ROD
AK305065AB
dD
L
The connecting rod is made of high ly rigid, forged
carb
on stee l. The rod p o rtion h a s an H- sha ped cro s s
section.
The connecting rod big end bearing is lu bricated
thr
oug h an oil p a ssage ru nn in g f r om the main jo urn a l
to the cranksha
f t p i n.
ItemDimension
d (Small end inner
diameter) mm18
D (Large end inner
diameter) mm43
L (Center distance) mm135.6
CONNECTING ROD BEARING
AK305309AB
H A
Identification
color
The up
per and lower conne ctin g rod b earin g halves
are id
entical.
The connecting rod be aring is e quip ped wit h back
met
a l. While the b earin g it se lf is ma de of a l uminum
allo
y , the back met a l is no rmally mad e of ste e l shee t.
The connecting rod be aring is n a rrower tha n the
bearin
g ca p, this is to minimize wear .
ItemDimension
H (Width) mm13.5
A (Thickness) mm1.5

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-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.