Cylinder Head And Valve Mechanism - Assemble; Cylinder Head - Assemble - Mitsubishi S12A2 Service Manual

5. Cylinder Head and Valve Mechanism - Assemble

5.1 Cylinder Head - Assemble

(a) Be careful when inserting the valve through stem
seal, as the edge of stem can cause damage to
the stem seal lip.
(b) Do not apply oil or liquid sealant to the fitting faces
between stem seal and valve guide.
(c) Always replace the stem seal with a new one.Stem
seal can not be re-used.
(1) Apply engine oil to the valve stem, and insert valve into
valve guide.
Note: The inlet valve and exhaust valve are different. Make
sure the correct mounting position.
(2) Install the stem seal to valve guide with guide and seal
installer.
Note: Place the valve in valve guide before installing the
stem seal. The valve stem seal is centered with valve
stem.
(3) Apply engine oil to the lip of stem seal.
(4) Install the valve spring and rotator to the valve guide,
and then install the valve cotter with valve spring
pusher.
(5) Tap the top of valve stem lightly several times with a
soft-head hammer to slightly open the valve, and make
sure that the valve spring and valve cotters are properly
installed and seated firmly.
Chapter 7 ASSEMBLY OF BASIC ENGINE
Guide and seal installer
P/N:32591-10300
30.3 ± 0.1 mm
[1.193 ± 0.04 in.]
Stem Seal - Install
Valve and Valve Spring - Install
Valve spring pusher
P/N:33591-04500
Application of engine oil
Valve Cotter - Install
Valve stem head
Valve - Install
Valve stem
Stem seal
Valve guide
Cylinder head
Valve cotter
Valve rotator
Valve spring
Stem seal
7-27