Mitsubishi Colt Ralliart. Manual - part 651

CAMSHAFT AND VALVE STEM SEAL

ENGINE MECHANICAL <4G1>

11C-24

CAUTION

• Do not re-use the valve stem seal.
•

AC107414

AF

MB991671

Valve

Valve stem
seal

Valve guide

Special tool valve stem seal installer 
(MB991671) must be used to install the valve 
stem seal. Improper installation could result 
in oil leaking past the valve guide.

3. Use special tool valve stem seal installer 

(MB991671) to fill a new valve stem seal in the 
valve guide using the valve stem area as a guide.

>>B<< VALVE SPRING INSTALLATION

AC201453

AB

Rocker arm side

Identification
colour

Install the valve spring with its identification colour 
painted end facing the locker arm.

>>C<< VALVE SPRING RETAINER LOCK 
INSTALLATION

AC402635

MD998772

AB

Use special tool valve spring compressor 
(MD998772) to compress the valve spring in the 
same manner as removal.

>>D<< ROCKER ARM LASH ADJUSTER 
INSTALLATION

CAUTION

If the rocker arm lash adjuster is reused, always 
clean and check it before installation.(Refer to 
GROUP 11D, Rocker Arms and Camshaft 

P.11D-30

).

>>E<< EXHAUST CAMSHAFT/INLET 
CAMSHAFT INSTALLATION

1. Remove sealant remained on the engine cylinder 

head.

2. Apply engine oil to the cam and the journal of the 

camshaft.

AC205419

AB

Engine front

Slit

Inlet camshaft

CAUTION

Do not install wrong camshaft at the side of inlet 
or exhaust. The inlet camshaft has a slit at the 
rear surface.
3. Install the camshaft to the engine cylinder head.

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TOC

CAMSHAFT AND VALVE STEM SEAL

ENGINE MECHANICAL <4G1>

11C-25

>>F<< CAMSHAFT BEARING CAP, NO. 
4/CAMSHAFT BEARING CAP, NO. 
3/CAMSHAFT BEARING CAP, NO. 
5/CAMSHAFT BEARING CAP, NO. 
2/CAMSHAFT BEARING CAP, REAR 
LEFT/CAMSHAFT BEARING CAP, 
FRONT/CAMSHAFT BEARING CAP, 
REAR RIGHT INSTALLATION

AC205421

AB

Dowel pin

Exhaust side

Inlet side

1. Set the dowel pin of the camshaft to the position 

as shown in the illustration.

AC205417

E 4

AB

Bearing cap No.

Identification of
inlet side and 
exhaust side

Engine front

Front mark

2. Camshaft bearing caps (No.2 to 5) are identical. 

To avoid confusion (bearing cap No. and 
inlet/exhaust side), confirm each identification 
mark and face the front mark towards the 
direction shown before installing them.

Identification mark (engraved on the front 
and bearing caps No.2 

− 5)

I: Inlet side
E: Exhaust side

AC207568

AB

Engine front

3. Apply sealant to the positions (8 areas) of the 

upper side of the cylinder head as shown in the 
illustration.

Specified sealant: MITSUBISHI GENUINE 
PART MD970389 or equivalent

NOTE: Install the camshaft bearing caps, rear and 
camshaft bearing caps, front within 15 minutes 
after applying sealant.

4. Check the identification marks on the camshaft 

bearing cap, front so that inlet side and exhaust 
side cannot be mistaken in the same way as that 
of bearing caps No.2 

− 5.

CAUTION

Then wait at least one hour. Never start the 
engine or let engine oil or coolant touch the 
adhesion surface during that time.
5. Tighten the bearing cap mounting bolts increasing 

the pressure in 2 to 3 times and finally tighten to 
the specified torque.

Tightening torque: 

25 

± 1 N⋅m <Camshaft bearing cap, front and 

rear>

11 

± 1 N⋅m <Camshaft bearing cap No.2 - 5>

6. Ensure that the rocker arms are installed properly.

NOTE: Remove an excess of sealant completely.

>>G<< CYLINDER HEAD CAMSHAFT 
END SEAL INSTALLATION

AC402626

MD998762

AB

Use special tool circular packing installer 
(MD998762) to press-fit the cylinder head camshaft 
end seal as shown. 

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CAMSHAFT AND VALVE STEM SEAL

ENGINE MECHANICAL <4G1>

11C-26

>>H<< CAMSHAFT OIL SEAL 
INSTALLATION

AC102323AC

MD998713

Camshaft oil seal

(Engine oil)

1. Apply engine oil to the entire inner diameter of the 

oil seal lip.

2. Use special tool camshaft oil seal installer 

(MD998713) to press-fit the oil seal as shown. 

>>I<< CAMSHAFT SPROCKET (EXHAUST 
SIDE) INSTALLATION

AC402637AB

Camshaft (Exhaust side)

1. Hold the hexagon part of the camshaft with a 

wrench.

2. Install the camshaft sprocket and tighten the 

camshaft sprocket mounting bolt to the specified 
torque.

Tightening torque: 88 

± 10 N⋅m

>>J<< CAMSHAFT SPROCKET (INLET 
SIDE) INSTALLATION

AC207579

Engine front

AB

(Engine oil)

Camshaft
sprocket
(Inlet side)

1. Apply engine oil to the tip of the camshaft and the 

camshaft installation side of the camshaft 
sprocket.

2. Align the dowel pin hole of the camshaft sprocket 

with the dowel pin of the camshaft, and install the 
camshaft sprocket to the camshaft.

3. While holding the hexagonal area of the camshaft 

with a wrench, check that the camshaft sprocket 
does not turn.
NOTE: This is necessary, because you cannot 
confirm that the camshaft dowel pin is inserted 
into the pin hole. 

AC207580

AB

Engine front

(Engine oil)

Camshaft
sprocket
(Inlet side)

4. Apply the engine oil to the threads and the face of 

the camshaft sprocket mounting bolt. Then fix the 
camshaft with a wrench in the same way as 
removal and tighten the camshaft sprocket 
mounting bolt to the specified torque.

Tightening torque: 55 

± 5 N⋅m

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TOC

CAMSHAFT AND VALVE STEM SEAL

ENGINE MECHANICAL <4G1>

11C-27

>>K<< CAMSHAFT POSITION SENSING 
CYLINDER INSTALLATION

1. Set the inlet camshaft to the No.1 cylinder at 

compression TDC.
NOTE: Use the force of the exhaust valve spring 
to rotate anti-clockwise.

AC205420

AB

Camshaft position
sensing cylinder 

2. Install the camshaft position sensing cylinder as 

shown, and tighten the camshaft position sensing 
cylinder mounting bolt to the specified torque.

Tightening torque: 22 

± 4 N⋅m

>>L<< CAMSHAFT POSITION SENSOR 
SUPPORT INSTALLATION

1. Remove sealant from the camshaft position 

sensor support and cylinder head surfaces.

AC205422

f3 mm

AB

2. Apply the sealant to the camshaft position sensor 

support flange in a continuous bead as shown in 
the illustration.

Specified sealant: MITSUBISHI GENUINE 
PART MD970389 or equivalent

NOTE: Install the camshaft position sensor sup-
port within 15 minutes after applying sealant.

3. Install the camshaft position sensor support to the 

cylinder head.

CAUTION

Then wait at least one hour. Never start the 
engine or let engine oil or coolant touch the 
adhesion surface during that time.
4. Tighten the camshaft position sensor support 

mounting bolts to the specified torque.

Tightening torque: 14 

± 1 N⋅m

>>M<< ROCKER COVER ASSEMBLY 
INSTALLATION

AC500202

1, 11

2, 12

4, 14

3, 13

8

9

10

7

6

5

Engine front

AB

1. Tighten the each bolt to 5.0 

± 1.0 N⋅m in the order 

(1

−14) shown.

2. After tightening of step 1, tighten the each bolt to 

7.0 

± 1.0 N⋅m in the order (1−10) shown.

>>N<< OIL CONTROL VALVE 
INSTALLATION

1. Apply a small amount of engine oil to the O-ring 

and then install it to the oil control valve.

2. Assemble the oil control valve to the cylinder 

head.

3. Tighten the oil control valve mounting bolt to the 

specified torque.

Tightening torque: 11 

± 1 N⋅m

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