Mitsubishi Lancer Evolution 8. Manual — part 151
4G6 ENGINE – CAMSHAFT, VALVE STEM SEAL
11A-6
MAIN POINTS REGARDING REMOVAL
A
DETACHING RADIATOR UPPER HOSE
Align the matching marks on radiator upper hose and hose clamp, then
detach radiator upper hose.
B
REMOVING CAMSHAFT SPROCKETS
Hold camshaft hexagonal part with a wrench, loosen mounting bolt, and
remove camshaft sprocket.
C
REMOVING VALVE SPRING RETAINER LOCK
Compress valve spring using the special valve spring compressor tool
(MD998772), and remove valve spring retainer lock.
CAUTION
When removing the valve spring retainer lock, all cylinder pistons
should be in the top dead centre position. If pistons are not in the
top dead centre position, valves could fall into the cylinders.
ASSEMBLY - MAIN POINTS
A
Fitting exhaust valve stem seals/inlet valve stem seals
1. Apply a small quantity of engine oil to valve stem seals
2. Place the valve stem into the guides, then insert a new valve stem
seal into the valve guide using the special valve stem seal installer
(MD998737).
CAUTION
(1) Valve stem seals cannot be re-used.
(2) If valve stem seals are not fitted correctly, it could lead to oil
leaking down, so the special valve stem seal installer tool
(MD998737) should be used for fitting.
Note
Check the colours on the rubber parts to identify inlet valve stem seals
and exhaust valve stem seals.
Matching marks
Valve
Valve guide
Valve stem
seal
Colour of main
body: grey
Colour of main body:
greenish grey colour
Inlet side
Exhaust side
4G6 ENGINE- CAMSHAFT , VALVE STEM SEAL
11A-7
B
FITTING VALVE SPRING
Fit so that the valve spring small radius end is on the rocker arm side.
C
FITTING VALVE SPRING RETAINER LOCK
Compress the valve spring using the same valve spring compressor tool
(MD998772) as the one used for removal and fit the valve spring retainer
lock.
D
FITTING LASH ADJUSTER
CAUTION
When re-using lash adjuster, without fail wash and check before fitting.
(Refer to Engine Workshop Manual)
E
FITTING EXHAUST CAMSHAFT / INLET CAMSHAFT
1. Remove any sealant adhering to the cylinder head.
2. Apply engine oil to camshaft cams and journals.
3. Fit camshaft to cylinder head.
CAUTION
Do not get intake and exhaust sides the wrong way round.
The exhaust camshaft has a slit on the rear end.
F
FITTING CAMSHAFT BEARING CAP No.4/ FITTING
CAMSHAFT BEARING CAP No.3/ FITTING CAMSHAFT BEARING
CAP No.5/ FITTING CAMSHAFT BEARING CAP No.2/ FITTING
CAMSHAFT BEARING CAP REAR/ FITTING CAMSHAFT
BEARING CAP FRONT
1. Set the camshaft dowel pins in the position shown in the diagram.
Rocker arm side
Engine front direction
Slit
Exhaust camshaft
Approx. 3°
Dowel pins
Intake side
Exhaust side
4G6 ENGINE – CAMSHAFT, VALVE STEM SEAL
11A-8
2. The camshaft bearing caps No.2~5 are the same shape, so check the
identification marks before fitting in the direction shown in the diagram,
in order to avoid getting bearing cap number, and intake and exhaust
sides, mixed up.
Identification marks (stamped on front and on bearing caps No.2~5)
I: Intake side
E: Exhaust side
3. Apply sealant to the 6 positions indicated in the diagram on the upper
surface of the cylinder head.
Semi-dry sealant: Three Bond 1207D
4. Fit camshaft bearing caps so that front marks are in the direction
indicated.
5. Check the identification marks on the camshaft bearing cap fronts, so
that, as with bearing caps No.2~5, there are no mistakes over intake
and exhaust sides.
6. Gradually tighten the bearing cap mounting bolts, 2~3 turns at a time, to
the specified torque.
Tightening torque: 20 ± 1 N·M
7. Check that the rocker arm is fitted correctly.
NB. Wipe away any traces of sealant squeezed out.
G
FITTING CAMSHAFT OIL SEAL
1. Apply engine oil around the entire circumference of the oil seal lip.
2. Insert oil seal using the special camshaft oil seal installer tool
(MD998713), as shown in the diagram.
H
As when removing, hold the camshaft hexagonal part with a
wrench, then tighten the mounting bolts to the torque specified.
Tightening torque: 89 ± 9 N·M
Engine forward
direction
Bearing cap
No.2
Intake side
Exhaust side
marks
Engine forward direction
Engine forward
direction
Front mark
4G6 ENGINE – CAMSHAFT, VALVE STEM SEAL
11A-9
I
FITTING CAMSHAFT POSITION SENSOR SUPPORT
1. Remove any sealant on the camshaft position sensor support.
2. Apply sealant to the camshaft position sensor support flange, as
shown in the diagram, then fit to the cylinder head.
Semi-dry sealant: Three Bond 1207F
3. Tighten camshaft position sensor support mounting bolts to the
torque specified.
Tightening torque: 14 ± 1 N·M
J
FITTING CAMSHAFT POSITION SENSING CYLINDER
1. Set the exhaust camshaft dowel pin in the position shown in the
diagram (No.1 cylinder compression top dead centre)
Note
It will turn slightly in a counter-clockwise direction, under pressure
from the exhaust valve spring.
2. As shown in the diagram, fit the camshaft position sensing cylinder
vain (small), so that it is approximately 45° relative to the exhaust
camshaft dowel pin.
3. Tighten the camshaft position sensing cylinder mounting bolts to the
torque specified.
Tightening torque: 22 ± 4 N·M
K
FITTING ROCKER COVER GASKET
1. Remove any sealant on the rocker cover gasket.
2. Apply sealant to 4 locations on the rocker cover lower surface, as
shown in the diagram.
Semi-dry sealant: Three Bond 1207D
3. Fit the rocker cover gasket to the rocker cover.
Vain (small)
Approx. 45°
Dowel pin
Vain (large)
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