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PART 1-1- GENERAL ENGINE SERVICE
1-9
FIG.
6-Valve Seat Width-Typical
FIG.
5-Volve Seat Runout-Typicol
T
ool~
T52L
_
6085
_
AEE
INTAKE AND
EXHA
UST_
223
SIX AND All M
0 V_8 fNGINES
INTAKE_ ALL HD
V·
8
ENGINES
1001
_
T56T.6085.'"
INTAKE
AND
EXHAUST-
ALL SO
v-a
ENGINES
EXHAUST-
ALL HO
v·a
ENGINES
FIG.
7-Reaming Valve Guides-Typical
CYLINDER HEADS
To
protect the machined surfaces
of
the
cylinder
head,
use
holding
fix-
tUfes while the head
is
off the engine.
CLEANING AND INSPECTION
With the
valves
installed to protect
the valve seats, remove
carbon
de-
posits from the valve
heads a
nd
cyl-
inder head
surface
with
a
scra
per
nnd
a wire brush. Be
careful
not to
scrntch
the
cylinder
head
gasket
surface.
After
the valves
arc
removed, clean
the
valve guide
bores with a
valve
guide cleaning
tool.
Use cleaning
sol-
vent to
remove
dirt
and grease.
Check
the
head for
cracks,
and
the gasket
surface
for
burrs
and
nicks.
Repl
ace
the
head
if it
is
cracked.
Do nol
plane
or
grind
more
than 0.010
inch
from
the
cylinder
hcad
gasket surface.
Remove
all
burrs
or scratches with
an
oil stone.
Check the valve
seat insert
for
signs of
excessive wear, cracks,
or
looseness
(intake
and
exhaust on
302
and 332
HO
V-S and all SO V-S
engines, exhaust
only
on
292
HD
V-S
engines)
.
Cylinder
Head
Flatness.
Check the
fl
atness of
the cylinder
head
gasket
surface (Fig. 4). Specifications for
flatness are 0.006 inch
maximum
over
all, or
0.003
inch
in
any
6 inches.
Valve Seal
Runoul. Check
the
valve seat runout
with an accurale
gauge
(Fig.
5).
Follow the
instruc-
tions of the gauge
manufacturer. The
total runout should not exceed the
wear
limit.
Valve Seat
Width.
Measure
the
valve seat
width (Fig.
6).
It should
be
within
specified limits.
REAMtNG VALVE GUt DES
If
it
becomes
necessary
to
ream
a
valve guide
(Fig.
7) 10
install
a valve
with an oversize stem,
a reami
ng
kit
is
available
which
contains
the follow-
ing reamer and pilot combinations;
a
O.003-inch
0.5.
reamer with a
stand-
ard
diameter pilot, a
O.OIS-inch 0.5.
reamer
with
a
0.003-inch
0.5.
pilot,
and
a
0.030-inch
reamer with a
0.015-
inch
0
.5.
pilot.
When
going
from
a standard size
valve
to
an oversize valve, always
use
the reamers in
sequence.
Always
reface the
valve seat
after the
valve
guide has
been
reamed.
REFACING VALVE SEATS
Refacing of
the
valve seats should
be closely coordinated with
the refac-
ing
of
the
valve
face
so
the finished
seat
will match the
valve
face
and be
centered. This
is
important so
that the
valve and
seat
will
have
a
good
com-
pression
and
vacuum tight fit. Be
sure
that the refacer
grinding
wheels are
properly dressed.
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