VALVE
SEAT
SEALING
CONDITION INSPECTION
With the valve and valve spring assembled, pour
a
small quan-
tity
of gasoline into the intake or exhaust port.
Check
that
no
gasoline leaks though the valve seat.
If
leakage
is
found, correct the sealing surface.
A WARNING
Gasoline
is highly flammable and explosive.
Keep
heat,
sparks,
and flames away from gasoline.
VALVE
STEM END CONDITION
Inspect
the valve stem end face for
pitting
and wear. If
pitting
or
wear
is
present, resurface the valve stem end.
Make
sure the
length
is
not less than the service
limit.
If
the length becomes
less than the service
limit,
replace the valve
with
a
new one.
WM Valve stem end length
Service
Limit: 1.8 mm (0.07 in)
VALVE
SPRING
The force
of
the
coil
spring keeps the valve seat
tight.
A
weak-
ened
spring results
in
reduced engine power output
and
accounts
for the chattering noise coming from the valve mecha-
nism.
Check
the valve springs for proper strength
by
measuring
their
free
length and also by the force required to compress them.
If
the
spring length
is
less than the service
limit
or if
the force
required
to
compress the valve spring
is
not
within
specifica-
tion,
replace both the inner and outer springs as
a
set.
B
Valve spring free length (IN & EX)
Service
Limit:
INNER: 35.0 mm (1.38 in)
OUTER:
37.8 mm (1.49 in)
GJSffil
Valve spring tension (IN & EX)
Standard:
INNER: 5.3-6.5 kgf/28.0 mm (11.7-14.3 lbs/1.10 in)
OUTER:
13.1-15.1
kgf/31.5 mm (28.9-33.3 lbs/1.24 in)
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