V-8
ENGINE
6-53
GRIND
WITH
FLAT
STONE
SEAT
WIDTH
Fig.
6-91
Valve
Seat
After
Grinding
With
Flat
Stone
flat
stone
(Fig
e
6-91),
This
is the only method that
should be used to narrow the seat.
NOTE:
Lapping
of
valve
seats
is not
required
or
recommended.
2.
Check
concentricity of valve seat and valve
guide. Concentricity of valve seat and valve guide
can
be checked by using a suitable
dial
indicator or
prussian
blue. When using a
dial
indicator, total
runout
should not exceed .002".
When
prussian blue Is used, a light coat should be
applied
to the face of the valve only and the valve
rotated in its seat. If blue appears all the way
around
valve seat, the valve seat and valve guide
are
concentric with one another.
3.
Check
concentricity of valve stem and face of
valve.
After cleaning prussian blue from valve and
seat from preceding check, lightly coat valve seat
with
prussian blue and rotate valve in guide. If blue
appears
all the way around valve, the valve stem
and
valve face are concentric with one another.
NOTE:
Both
tests
in
steps
2 and 3 are
necessary
to
insure
proper
valve
seating.
REAMER
Fig.
6-92
Reaming
Valve
Guide
FITTING
VALVE
STEMS
TO
GUIDES
Correct
valve stem clearance for valve guides is
.0016" to .0033" for intake valve and .0021" to .0038"
for
exhaust valve.
Valves
with oversize stems are available in .001",
.003" and .005" larger than
standard.
The same valve
stem to guide clearance applied for oversize stems.
Oversize
reamers are required to enlarge valve
guide
holes
to fit the oversize stems. When the
reamer
is turned through valve guide it
will
size
hole to fit valve stem according to above limits.
Carefully
ream valve guide using valve guide
reamer
J
5830-1
for .003" oversize stems and valve
guide reamer J 6621 for .005" oversize stems (Fig.
6-92). For best results when installing .005" over-
size valve stem, use .003" oversize reamer first
and
then ream to .005" oversize. Always reface
valve seat after reaming valve guide.
NOTE:
Valves
are
marked
.001, .003 or .005
with
colored
ink.
CYLINDER
HEAD
AND
VALVES-ASSEMBLE
1.
Install
valves, valve springs, valve stem shields
valve spring retainer cups, valve stem seals and re-
tainer
cup locks, using suitable spring compressor.
The
valve stem seals must be installed in the second
groove
(from end of stem). Valve stem seal installer
and
tester J
22330
can be used to install this seal
(Fig.
6-79). Where necessary, install new umbrella
type seal using suitable plastic protector over end of
valve stem.
After
valves have been Installed, the suction cup
end of special tool J
22330
should be used to
test
for
leaks
between the valve spring retainer cup and
valve stem seal (Fig. 6-80). The suction cup
will
tend to be held to the valve spring retainer cup by
suction when seal is satisfactory. If a leak is
detected, replace seal or valve spring retainer cup
as necessary. It is important to have a positive seal
between the valve spring retainer cup and valve
stem seal to prevent excessive amounts of oil from
being drawn down the valve stem which
will
cause
exhaust smoke and oil consumption.
2.
Install
spark
plugs.
HARMONIC
BALANCER-TIMING
CHAIN
COVER
AND
GASKET-TIMING
CHAIN
AND
SPROCKETS-
OIL
SEAL-FUEL
PUMP
ECCENTRIC
HARMONIC
BALANCER-
REMOVE
AND
REPLACE
1. Loosen generator at adjusting strap and lower
pivot bolt and remove fan belt from harmonic
bal-
ancer.
On cars equipped with power steering, also
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