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Checking Valve
1.
Check the contact surface of the valve face and valve seat for
damage.
Minor
or
rough
surface may be repaired with a valve
grinder.
2.
If the valve stem is worn, damaged, bent or the end surface of the
stem is dented, replace the valve.
3.
Check
the
valve
stem diameter
with
a
micrometer;
if
the
wear
exceeds the limit, replace the valve.
4.
Valve stem diameter limit:
Intake valve:
7.980 mm
(0.3142 in)
Exhaust valve:
7.975 mm
(0.3140 in)
Check· the
thickness
head
(margin)
and the
Replace
if
less
than
cified limit.
Minimum valve head
thickness:
1.Omm (0.00394 in)
of
valve
diameter.
the
spe-
Limit of reduction in
diameter:
Intake:
7.980 mm
(0.3142 in)
Exhaust:
7.975 mm
(0.3140 in)
Checking Valve Spring
1.
Check
the
valve
spring
for
corrosion or damage and replace,
if necessary.
2.
Check
the
spr ing
length
and
replace the spr ing
if the free
length
is
less
than
the
following dimensions.
Free length limit:
42.0 mm
(1.654 in)
37
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