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Sectio
n
5-Rocker
Mechanism
,
Cylinder
Head,
Valves, Valve
Lash
Adjustment,
and Valve Timing
17
VALVE _ R
ING
SLEEVE\
LOCKS
'~~
Oll
S~~~~
.
~
~ ~
,
VLE
~
VALVE SPRING
RET
AIHER
6074
fig. J 2-Rotating-Type Valve Assembly
VAlVE-
G505
';~
@Y~
~cJ~
r'©)
CAP-
6550
SPRING-
G5 13
1387
fig
.
J3-fre
e
Turning-Type Valv
e
Ass
e
mbly
Check
the
va lve
for
evidence of
imperfect
seating,
heavy
discoloration,
burning
or
erosion, or
ev
idence of
warpage.
Check
the
va
lve
face
runou
t
(fig.
14
),
and
also
check
th
e face
for
pits
and
grooves.
Inspect
the
ends
of
the
valve
stem
for
grooves or scores.
Inspect th
e valve springs
for
cracks or
other
signs
of
failure.
M
ake sure
the
ground surface
of
the
spring is
flat.
Check
the va lve spring
pressure
(
fi
g.
15
) and the
valve
spring
free
length.
Check the
va lve
spring
retainers
for wear
or signs
of
failure.
Check
the tapered seat
where
the
va
lve
locks
in
the retainer.
These locks
are
split,
and
wear
may
be
noted by
ridges
left
between
t
he ha lves
of
t he locks.
Check
the
exhaust
va
lve
seat
insert
(256,
279, and
3 17
c
ubic inch
engines)
for
looseness or
signs
of exces-
sive wea
r.
Check t
he
I.
D. of
the
valve
guides
(fig. 16)
a
nd
the
O.
D.
of
the
intake
and
exha ust
va
lve
stems (fig.
17)
a...--
""nou'
Gauge
6266
fig. J 4-Valve face Runout Check
Valve
Spring
Te5ter
- -
-.
PRESSURE
Fig.
15-
Valv
e
Spring Pressure Check
6267
aga
inst
specifications.
If
the clearance
is
not
within
limits,
and the
diameter of
the
valve
stem
is on
the
lower
lim
it,
select
a new
va
lve
with
a
stem diameter on
th
e
upper limit.
If
the clearance
is
sti
ll
not within
limits,
ream the valve
guide
(fig.
18)
for
the
next
oversize
va
lve
stem.
Check the
va
lve
seat
runout
and
the valve
seat
width
as
shown
in
figs.
19
a
nd 20.
D
iscard
any defective
valves, springs,
locks,
or
retainers.
(2) REFACINC
VALVES
.
Grind
the
va lve
face
at
a
45
0
angle on
a
va lve
grinder
(fig.
21).
Grind
off
only
enough stock
to
remove
pits
and
grooves
from the
valve
face.
If
the edge of
the
va lve
head
is less
than 'l:winch
afte
r
grinding, re place
the
va
lve.
Dial
Hale
Gauge
6268
fig. J 6-Measuring 1.0. of the Valve Guide
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