Mitsubishi Lancer (4A9 engine). Manual - part 29

CAMSHAFT

ENGINE MECHANICAL <4A9>

11A-30

>>F<< CYLINDER HEAD COVER ASSEMBLY 
INSTALLATION
1. Remove the sealant from the cylinder head cover 

assembly and the matching area of the cylinder 
head assembly and the timing chain case 
assembly, and degrease the surface where the 
sealant is applied.

CAUTION

After the installation, until a sufficient period of 
time (one hour or more) elapses, do not apply the 
engine oil or water to the sealant application area 
or start the engine.

AC311270

Timing
chain
case
assembly

Cylinder head assembly

Section A - A

A

A

A A

AD

 

4 mm

2. Apply specified sealant to the matching area of 

the cylinder head assembly and the timing chain 
case assembly as shown, and install the cylinder 
head cover assembly to the cylinder head 
assembly.

Specified sealant: ThreBond 1217G or equiv-
alent

NOTE: Install the cylinder head cover assembly 
immediately after the application of sealant.

ACA00275AE

9

7

5

10

2

3

8

1

4

6

Engine front

ACA00275

3. Tighten the cylinder head cover assembly 

mounting bolts to the specified torque in the order 
of the numbers shown in the illustration.

Tightening torque: 3.0 

± 1.0 N⋅m 

4. Tighten again the cylinder head cover assembly 

mounting bolts to the specified torque in the order 
of number shown in the figure.

Tightening torque: 5.5 

± 0.5 N⋅m 

VALVE STEM SEAL

ENGINE MECHANICAL <4A9>

11A-31

VALVE STEM SEAL

REMOVAL AND INSTALLATION

M1112008101624

CAUTION

*Remove and assemble the marked parts in each cylinder unit.

Pre-removal operation
• Engine Room Under Cover Front B and Engine Room 

Side Cover (RH) Removal (Refer to GROUP 51 

− Under 

Cover ).

• Engine Coolant Draining (Refer to GROUP 14 − On-vehi-

cle Service, Engine Coolant Replacement ).

• Engine Oil Draining (Refer to GROUP 12 − On-vehicle 

Service, Engine Oil Replacement ).

• Ignition Coil and Spark Plug Removal (Refer to GROUP 

16 

− Ignition System, Ignition Coil ).

• Cylinder Head Cover Assembly Removal (Refer to ).

• Engine Oil Pan Removal (Refer to ).
• Timing Chain Removal (Refer to ).

Post-installation operation
• Timing Chain Installation (Refer to ).
• Engine Oil Pan Installation (Refer to ).

• Valve Clearance Check (Refer to ).

• Cylinder Head Cover Assembly Installation (Refer to ).
• Ignition Coil and Spark Plug Installation (Refer to GROUP 

16 

− Ignition System, Ignition Coil ).

• Engine Oil Refilling (Refer to GROUP 12 − On-vehicle 

Service, Engine Oil Replacement ).

• Engine Coolant Refilling (Refer to GROUP 14 − On-vehi-

cle Service, Engine Coolant Replacement ).

• Engine Room Under Cover Front B and Engine Room 

Side Cover (RH) Installation (Refer to GROUP 51 

− Under 

Cover ).

AC700511

3

AD

11 ± 1 N·m

1

4

5

11 ± 1 N·m  

20 ± 1 N·m  

N

N

2

Apply engine oil to all
moving parts before
installation.

6*

7*

8*

9*

10*

9*

8*

6*

7*

10*

11*

11*

Removal steps 

<<

A

>>

>>

D

<<

1.

Front camshaft bearing cap

<<

A

>>

>>

D

<<

2.

Camshaft bearing cap (exhaust 
side)

3.

Camshaft and camshaft sprocket 
assembly (exhaust side)

<<

A

>>

>>

D

<<

4.

Camshaft bearing cap (inlet side)

5.

Camshaft and V.V.T. sprocket 
assembly (Inlet side)

<<

B

>>

>>

C

<<

6.

Valve tappet

<<

C

>>

>>

B

<<

7.

Valve spring retainer lock

Removal steps (Continued)

VALVE STEM SEAL

ENGINE MECHANICAL <4A9>

11A-32

REMOVAL SERVICE POINTS

<<A>> FRONT CAMSHAFT BEARING CAP / CAM-
SHAFT BEARING CAP REMOVAL
1. Temporarily install the engine oil pan which was 

removed at the timing chain removal (Refer to ).

CAUTION

When supporting the engine and transmission 
assembly with a garage jack, be careful not to 
deform the engine oil pan.
2. Place a garage jack against the engine oil pan 

with a piece of wood in between to support the 
engine and transmission assembly.

AC700024AB

MB991454

MB991928

MB991527

AC700023AB

MB991454

MB991895

MB991527

3. Remove special tool engine hanger (MB991928 

or MB991895) which was installed for supporting 
the engine and transmission assembly when the 
timing chain was removed.

AC403719

AH

1

1

2

2

1

2

3

4

3

4

3

6

5

5

6

8

7

7

8

Engine front

Front camshaft
bearing cap

Camshaft bearing cap

Camshaft bearing cap

4. Loosen the front camshaft bearing cap mounting 

bolts, and then loosen each camshaft bearing cap 
mounting bolts in the order shown. Remove the 
front camshaft bearing cap and each camshaft 
bearing cap.

<<B>> VALVE TAPPET REMOVAL

CAUTION

• Do not use pliers or other tools to remove the 

valve tappets. Always remove them by hand.

• When reusing the removed valve tappet, it 

has to be installed in the same position as 
before. Be sure to put a tab that shows the 
original installation position on the valve tap-
pet when storing it.

AC509270

AB

Valve tappet

Remove all of the valve tappets by hand.

<<C>> VALVE SPRING RETAINER LOCK 
REMOVAL

8.

Valve spring retainer

9.

Valve spring

<<

D

>>

>>

A

<<

10. Valve stem seal

>>

A

<<

11. Valve spring seat

Removal steps (Continued)

AC509271

AB

MD998772

MB992090

MB992089

VALVE STEM SEAL

ENGINE MECHANICAL <4A9>

11A-33

1. Screw in special tool retainer holder attachment 

(MB992090) to special tool valve spring 
compressor (MD998772), and assemble special 
tool retainer holder C (MB992089).

CAUTION

When removing the valve spring retainer lock, 
leave the piston of the cylinder in the TDC (Top 
Dead Centre) position. The valve may fall into the 
cylinder if the piston is not properly in the TDC 
position.
2. Install special tool MD998772 (with special tools 

MB992090 and MB992089 attached) to the 
cylinder head and compress the valve spring. 
Then, remove the valve spring retainer lock.

<<D>> VALVE STEM SEAL REMOVAL

AK502782AB

Valve stem seal

MB992085

Use special tool valve stem seal pliers (MB992085) 
to nip the base of the stem seal (where the outside 
diameter is larger) securely, and remove it by twisting 
it to the left and right.

INSTALLATION SERVICE POINTS

>>A<< VALVE SPRING SEAT / VALVE STEM SEAL 
INSTALLATION

AKA00416AC

1

7

2

3

4

6

5

8

Valve stem seal installer 
adjustable (MB992677)

Use a special tool to install the valve stem seal, 
obeying the following procedures:
1. The special tool valve stem seal installer 

adjustable (MB992677) is composed of the 
components shown in the illustration.
1: Chuck
2: Sleeve
3: Rock nut (small)
4: Outer pipe
5: Rock nut (large)
6: Guide pin (5.9) 
7: Guide pin (4.9)
8: Cap

2. Adjust the inside chuck diameter, obeying the 

following procedures.