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Chapter 7 ASSEMBLY OF BASIC ENGINE
5. Cylinder Head and Valve Mechanism - Assemble
5.1 Cylinder Head - Assemble
(1) Apply engine oil to the valve stem, and insert valve into
valve guide.
(2) Install the lower retainer to valve guide on exhaust side.
(Exhaust double spring spec only)
(3) 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.
Stem Seal - Install
Valve and Valve Spring - Install
(4) Apply engine oil to the lip of stem seal.
(5) Install the retainer, valve spring and rotator to valve
guide, and install the valve cotters with valve spring
pusher.
Note: In case of the double spring spec, parts are different be-
tween inlet and exhaust valves. Make sure that correct
parts are assembled.
Valve Cotter - Install
(6) 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.
Valve - Install
(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.
(d) For the double spring exhaust valve, first place the
lower retainer, then install the stem seal.
Lower retainer
Valve guide
Guide and seal installer
P/N:37191-11500
Valve stem
34.3 mm
[1.35 in.]
Cylinder head
Stem seal
Guide and seal installer
P/N:37591-12300
33.6 mm
[1.32 in.]
Single spring type
Double spring type
Inlet side
Exhaust side
Exhaust
double spring type
Valve cotter
Valve rotator
Valve rotator
Valve spring
Stem seal
Inner valve spring
Outer valve spring
Lower retainer
Application of engine oil
Valve spring pusher
P/N:33591-04500
Valve step head
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