Valve Spring Installation; Valves; Valve Stem Seal - TGB EST 1000 Service Manual

5-2. ENGINE TOP END

Valve Spring Installation

▪ For installation, reverse the removal
procedure.
▪ To ease installation of cotters, apply oil or
grease on them so that they remain in place
while releasing the spring.
NOTE: Valve cotter must be properly engaged
in valve stem grooves.
▪ After spring is installed, ensure it is properly
locked by tapping on valve stem end with a
soft hammer so that valve opens and closes a
few times.
NOTICE: An improperly locked valve spring will
cause engine damage.

VALVES

Valve Removal
▪ Remove valve spring.
▪ Push valve stem, then pull valves (intake and
exhaust) out of valve guide.
▪ Remove valve stem seal with SNAP-ON
PLIERS and discard it.
Valve Inspection

Valve Stem Seal

▪ Always install new seals whenever valves are
removed.
Valve
▪ Inspect valve surface, check for abnormal
stem wear and bending. If out of specification,
replace by a new one.
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