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CYLINDER HEADIVALVES
CYLINDER HEAD INSPECTION
CYLINDER HEAD
Use care not to
SCf8fcil the
combustion
ctl8mber or head
gasket
surface.
9-28
Disassemble the cylinder
head (page
9-27),
Remove
the ca
rbon deposits from
the combustion
chamber
and exhaust
port.
Check
the
spark plu
g
hole
and valve areas
for
cracks.
Check
the
cylinde
r
head fo
r
warpage with
a
straight
edge
and feeler
gauge.
SERVICE
LIMIT:
0.05 mm (0.002 in)
VALVE SPRING
Check
the
valve springs
for fatigue
or
damage.
Measu re
the free
length
of
the
intake
and
exhaust
valve springs.
SERVICE
LIMITS:
IN
:
39.7 mm (1.56 in)
EX:
41 .9 mm (1.65 in)
Replace the springs
if
they are
shorter
than the
ser-
vice limits.
VALVEIVALVE GUIDE
Inspect
each
valve
for
out-af-round,
burns,
scratches or abnormal stem wear.
Check
the
valve movement
in
the
guide.
Measure and record
t he valve
st
em 0.0.
STANDARD:
IN:
5.475 - 5.490 mm (0.2156
-
0.2161 in)
EX:
4 .965
-
4
.980
mm (0.1955
-
0.1961 in)
SERVICE
LIMIT:
EX:
4.96
mm
(0.195
in
)
\
~
EX
HAUST
VALVE
SPRING
...
INTAKE
VALVE
•
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