Mitsubishi Evolution X. Manual — part 179

VALVE STEM SEAL

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ENGINE MECHANICAL

11A-47

INSTALLATION SERVICE POINTS

.

>>A<< VALVE STEM SEAL INSTALLATION

CAUTION

• Valve stem seals cannot be reused.
• Do not damage the wall of the tappet hole when install-

ing the valve stem seal.

• Special tool MD998737 must be used to install the valve

stem seal. Improper installation of the valve stem seal
could result in oil leaking past the valve guide.

1. Apply a small amount of engine oil to the press-fit part and

lip part of the new valve stem seal.

2. Use special tool MD998737 to press-fit a new valve stem

seal in the valve guide using the valve stem area as a guide.

.

>>B<< VALVE SPRING INSTALLATION

Install the valve spring so that the painted side faces toward the
camshaft.

.

AC708679AC

AC308654AG

MD998737

Valve

Valve guide

Valve stem
seal

AK502553

Paint mark position

AD

VALVE STEM SEAL

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ENGINE MECHANICAL

11A-48

>>C<< VALVE SPRING RETAINER LOCK
INSTALLATION

In the same manner as removal, use special tool MD998772
with special tool MB992090 and special tool MB992089
attached to compress the valve spring, and install the valve
spring retainer lock.

.

>>D<< VALVE TAPPET INSTALLATION

1. Apply a small amount of engine oil to the valve tappets.

CAUTION

Be sure to install the valve tappets in the same position as
before.
2. Install the valve tappet to the cylinder head.

.

AC509271

AC

MD998772

MB992090

MB992089

AC509270

AC

Valve tappet

VALVE STEM SEAL

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ENGINE MECHANICAL

11A-49

>>E<< THRUST CAMSHAFT BEARING
CAP/CAMSHAFT BEARING CAP/OIL FEEDING
CAMSHAFT BEARING CAP INSTALLATION

1. Install the camshaft bearing caps to the cylinder heads.

NOTE: Because the thrust camshaft bearing cap and cam-
shaft bearing cap are the same in shape, check the cap
number and additionally its symbol to identify the intake and
exhaust sides for correct installation.

2. Tighten each camshaft bearing cap to the specified torque in

the order of number shown in the figure in two or three
steps.

Tightening torque: 12

± 1 N⋅ m (107 ± 8 in-lb)

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AC506778

AC

8

8

7

7

6

6

5

5

4

4

3

3

2

2

1

1

E 5

Engine front

Camshaft bearing cap

Camshaft bearing cap

Bearing cap No.

Identification of intake side
and exhaust side

VALVE STEM SEAL

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ENGINE MECHANICAL

11A-50

>>F<< CAMSHAFT BEARING/CAMSHAFT AND
CAMSHAFT SPROCKET ASSEMBLY (EXHAUST
SIDE) INSTALLATION

CAUTION

• Be careful not to drop the camshaft bearing.
• When installing the camshaft and camshaft sprocket

assembly (exhaust side), be careful not to let the cam-
shaft bearing which is installed to the front cam bearing
deviate from its position.

When replacing the camshaft bearing, according to the identifi-
cation mark of front camshaft bearing cap in the table below,
select a camshaft bearing with the corresponding size. Note
that the identification mark of camshaft bearing is stamped on
the place shown in the figure.

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>>G<< FRONT CAMSHAFT BEARING CAP
ASSEMBLY INSTALLATION

CAUTION

When the mounting bolts are tightened with the front cam-
shaft bearing cap tilted, the front camshaft bearing cap is
damaged. Install the front camshaft bearing cap properly
to the cylinder head and camshaft.
1. Install the front camshaft bearing cap to the cylinder head,

and temporarily tighten the front camshaft bearing cap to the
specified torque in the order of the figure (1).

Tightening torque: 17

± 3 N⋅ m (13 ± 2 ft-lb)

2. Tighten the front camshaft bearing cap again to the specified

torque in the order of the figure (2).

Tightening torque: 30

± 2 N⋅ m (23 ± 1 ft-lb)

Front camshaft bearing cap

Camshaft bearing
identification mark

Identification
mark

Journal diameter
mm (in)

1

40.000 - 40.008
(1.5748 - 1.5751)

1

2

40.008 - 40.016
(1.5751 - 1.5754)

2

3

40.016 - 40.024
(1.5754 - 1.5757)

3

AC611697

AD

Front camshaft
bearing cap

Identification
mark

AC708893

Notch

Identification mark

Oil hole

AD

AC511062

AC

4

3

2

1

4

3

2

1

(1)

(2)

Engine front

Front
camshaft
bearing
cap
assembly