Mitsubishi Lancer (4A9 engine). Manual - part 30

AKA00417AC

Outer 
circumference 
line of chuck

Rock nut (small)

Shoulder of valve 
stem seal

Sleeve

Chuck

VALVE STEM SEAL

ENGINE MECHANICAL <4A9>

11A-34

(1) Install the sleeve to the chuck as shown in the 

illustration.

(2) Install the shoulder of the valve stem seal to 

the chuck, aligning with the outer 
circumference line of the chuck as shown in 
the illustration.

(3) Turn the sleeve to wring the chuck.
(4) Stop the sleeve at the position where you can 

easily remove the valve stem seal by hand.

(5) Use the (small) rock nut to fix the sleeve.

AKB00029AB

L

Installation structure of valve stem seal

AKA00541AF

L

L1

Reference: Insertion length (L) of valve stem 
seal is the same as that of checkpoint (L1).

Same length

3. Adjust the stem seal insertion length, obeying the 

following procedures.
Set the valve stem seal insertion length (L) of 
14.4mm.

AKA00420AC

Outer 
circumference 
line of chuck

Outer pipe

Chuck

Mark

(1) The position, in which the end face of the outer 

pipe is aligned with the outer circumference 
line of the chuck, is 0mm of the insertion 
length. Insert the chuck and the sleeve into the 
outer pipe to fit the nut as shown in the 
illustration.

(2) Turn the chuck to adjust the valve stem seal 

insertion length.

NOTE: The insertion length can change by 
1mm per the chuck turn.
To easily know how many times the chuck is 
turned, put the mark at the position shown in 
the illustration.

AKA00418AC

Checkpoint (L1) of insertion length

End 
face

End face of 
chuck threads

Chuck

Outer pipe

Rock nut (large)

Vernier caliper

(3) Use a vernier caliper to measure the 

checkpoint (L1) of the insertion length shown 
in the illustration. Check the insertion length.

(4) Use the (large) rock nut to fix the sleeve.

AKA00419AE

Cap

Chuck

4. Install the cap to the chuck.
5. Apply the engine oil to the valve stem seal to set 

the chuck.

VALVE STEM SEAL

ENGINE MECHANICAL <4A9>

11A-35

6. Install the valve spring seat.

AKB00043AC

L

7. Use the plastic hammer to insert the valve stem 

seal.

>>B<< VALVE SPRING RETAINER LOCK 
INSTALLATION

AC509271

AB

MD998772

MB992090

MB992089

In the same manner as removal, use special tool 
valve spring compressor (MD998772) with special 
tool retainer holder attachment (MB992090) and spe-
cial tool retainer holder C (MB992089) attached to 
compress the valve spring, and install the valve 
spring retainer lock.

>>C<< VALVE TAPPET INSTALLATION
1. Apply a small amount of engine oil to the valve 

tappets.

CAUTION

• Do not use pliers or other tools to install the 

valve tappets. Always install them by hand.

•

AC509270

AB

Valve tappet

Be sure to install the valve tappets in the 
same position as before.

2. Install the valve tappet to the cylinder head by 

hand.

>>D<< CAMSHAFT BEARING CAP/FRONT 
CAMSHAFT BEARING CAP INSTALLATION

AC205417

E 4

AB

Bearing cap No.

Identification of
inlet side and 
exhaust side

Engine front

Front mark

1. The No.2 to No.5 bearing caps are equally 

shaped for both the inlet and exhaust camshafts. 
Be sure to correctly install them by referring to the 
identification marks.

Identification mark (stamped on the front 

and No.2 to No.5 bearing caps)

I: Inlet
E: Exhaust

AC403719

AE

3

8

7

2

8

7

1

5

6

5

6

3

4

4

3

1

2

2

1

Engine front

Front camshaft
bearing cap

Camshaft bearing cap

Camshaft bearing cap

VALVE STEM SEAL

ENGINE MECHANICAL <4A9>

11A-36

2. Tighten each camshaft bearing cap mounting 

bolts to the specified torque in the order shown, 
and then tighten the front camshaft bearing cap 
mounting bolts as well.

Tightening torque:

11 

± 1 N⋅m (Camshaft bearing cap mounting 

bolts)

20 

± 1 N⋅m (Front camshaft bearing cap mount-

ing bolts)

AC700024AB

MB991454

MB991928

MB991527

AC700023AB

MB991454

MB991895

MB991527

3. Install special tool engine hanger (MB991928 or 

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

4. Remove the garage jack which supports the 

engine and transmission assembly.

5. Remove the engine oil pan installed temporarily.

OIL PAN

ENGINE MECHANICAL <4A9>

11A-37

OIL PAN

REMOVAL AND INSTALLATION

M1112002803126

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

Side Cover (RH) Removal (Refer to GROUP 51 

− Under 

Cover ).

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

Service, Engine Oil Replacement ).

• Crankshaft Damper Pulley Removal (Refer to ).

Post-installation Operation
• Crankshaft Damper Pulley Installation (Refer to ).
• Engine Oil Refilling (Refer to GROUP 12 − On-vehicle 

Service, Engine Oil Replacement ).

• Engine Room Under Cover Front B and Engine Room 

Side Cover (RH) Installation (Refer to GROUP 51 

− Under 

Cover ).

ACA00281

N

11 ± 3 N·m

39 ± 5 N·m

2

3

5

4

AC

1

N

6

8.0 ± 2.0 N·m

11 ± 3 N·m

Removal steps 

•

Engine oil level gauge

1.

Bell housing cover

2.

Engine oil pan drain plug

3.

Engine oil pan drain plug gasket

<<

A

>> >>

A

<< 4.

Engine oil pan

5.

Engine oil screen assembly

6.

Gasket

REMOVAL SERVICE POINT

<<A>> ENGINE OIL PAN REMOVAL
1. Remove the engine oil pan mounting bolts.

AC102324 AB

MD998727

MD998727

2. Use special tool oil pan FIPG cutter (MD998727) 

to remove the engine oil pan.

INSTALLATION SERVICE POINTS

>>A<< ENGINE OIL PAN INSTALLATION
1. Remove sealant from the engine oil pan and 

cylinder block surfaces.