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1-10
GROUP I-ENGINES
TO
REMOVE ST
OCK
TO
REMOVE 5TOO:
FROM
TOP
OF
SEAT,
FROM eoTIOM
OF SEAT,
COUNTER80RE TO ENGINE SPEOFICATIONS
USE
6<r
WHEfl~.
-.::::::=;
___
30" USE 30-
WHEEL
TRUE UP
THIS
fACE LIGHTLY
12
10
-
1
10
93 -1.
FIG.
9-Counte
rbore
For O
versize
lnsert-HD and
SD V-S Engin
es
FIG.
a-Val
ve
Seat Refacing
-
Typ ical
--11---
~'
MINIMUM
.....
_
'~I~":M
VAlVE
fACE RUNOur
0.002
REFER
T
O SPECIFICATIO NS
fOR CORRECT
DlAMffiR
00
NOT
R~OVE
MORE THAN
0.0 10
1776."
FIG.
lO-
Critica
l Valve Tole
ra nces-Typical
1~
___
,...,.'TV_2I/unou' Gou".
Grind
the valve seat
to
a
Irue
45°
angle
(Fig. 8), Remove only
cnough
stock
to
clean up
pits, grooves, o
r
to
correct
the va lve seat
Tuno
ut
.
AIler
Ihe
seal
is
ground,
measure the seat
width (Fig. 6).
Narrow
thc
scat, if
necessary to
bring
it
within
limits.
FIG.
ll-Valve
Face
Runout-Typical
If
the
valve
seat
width
exceeds Ihc
maximum
limi t,
remove
enough
stock
from
the
top
edge
and/or
bOI-
10m
edge
of
Ihe
seal
to reduce the
width
to
specifications
(Fig.
8). Use
a
30°
angle
grind
ing
wheel
to
remove
slock from the
bottom of Ihe seat
(raise Ihe seal). Use a 60
0
angle
wheel
to
remove stock
from
Ihe lOp
of
the seal
(lower
the scal).
The
finished
va
lve scat
should
con-
laci the
approximate center
of
the
valve
face.
To
determine
where
the
valve
seat
contacts the face, coat the
seat with
Prussia
n
blue,
Ihen sel
the
valve in
place.
ROlate
Ihe
valve
with
light pressure.
If
the
blue
is trans-
ferred
to
the
center
of
the
valve face.
the
conlact
is
satisfac tory.
If the blue
is
transferred
10 the top edge of the
valve
face
,
lower the valve
seat.
If the
blue is transferred to the bottom edge
of
the
valve face, raise the va lve
seal.
After
refacing the va lve
seal,
it
is
good practice
to light
ly lap
in
the
valve
with
a
medium
grade lapping
compound. Remove
all the
com-
pound from
Ihe
valve
and
scat after
the
lapping operation.
VALVE SlA
T
INSERT
REPlACEMENT_
HD
AND SD
v-a
ENGI NES
The exhaust valve
seats of
the
292
HD
V-8
are Ihe
inserl-type and the
int
ake and exhaust valve seats
of
the
302 and 332
HD
V-8
and
all
SD
V-8
engi nes
arc
the insert
type.
To
remove
Ihe
valve seal insert,
inver!
the
head
and
position
a
drift
in
the valve
port, then drive the
insert
out.
Coun!erbore the
insert
recess 10
speci fications (Fig.
9). Cut
slightl
y
below the o
ld
counterbore depth to
clean
up this face (approxi mately
0.001-0.002
inch).
C lean
out
chips
and
oil
from the recess.
Chill
the
oversize insert
and Ihe
installation
tool
in
dry
ice for
~
hour.
T he
Insert must
be instaUed
immediately
upon removal from
the
dry
Ice.
Proted the hands
when
handling the chilled
Insert and tool.
Posi
tion
the
insert
on
the
tool
with
the small
radius
on the outer
edge
faci ng outward.
Pilot
the
d riving
tool
in the valve guide,
then
drive
the
insert
into the counterbore
until it
is
(ully
seated
.
Do
not
peen
the area
around
the
insert. Reface
the
new
insert.
VALVES
CLEANING AND INSPECTION
Remove
all
carbon
and
varnish
from
the
valve with
a fine wire brush
or
buffi ng whcel.
The
critical
inspec-
tio
n
points and lO[erances o
f
the
valve
arc illustrated in
Fig. 10.
Inspect
the
valve
face
aDd
the
ed
ge o
f
the
valve
he
a
d
(or pits,
grooves,
scores,
or
other defects.
Inspect
the
stem for
a
bent
condition
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