Ford Thunderbird 1958 User Manual

1-12
GROUP
1-POWER
PLANT
TABLE
3
Valve
Timing
Specifications
1719-A
FIG.
13
Valve Clearance
Intake
Valve
Opens
Closes
Crankshaft
Degrees
Camshaft
Lobe
Lift
Crankshaft
Degrees
Camshaft
Lobe
Lift
21
B.T.C.
0.017
51
A.BC.
0.019
Exhaust Valve
Opens
Closes
Crankshaft
Degrees
Camshaft
Lobe Lift
Crankshaft
Degrees
Camshaft
Lobe
Lift
67B.B.C.
0.017
9
A.T.C
0.019
VALVE
TIMING
The
valve
timing
should be checked
when poor
engine
performance
is
noted
and all
other
checks,
such
as
carburetion,
ignition
timing,
etc.
fail
to
locate the cause of
the
trouble.
Before the
valve
timing
is
checked,
check for a
bent
timing
pointer.
Bring
the No. 1 piston to
T.D.C.
on
the
compression
stroke
and
see
if the
timing
pointer
is aligned with the
T.D.C.
mark on
the
damper.
If the
valve
timing
is
not within
specifications,
check the
timing
chain,
camshaft
sprocket,
crankshaft
sprocket, camshaft,
and
crankshaft
in
the
order
of
accessibility.
To
check
the
valve
timing
with
the
engine
installed,
proceed
as
follows:
Install
a
quadrant
on the
crank
shaft
damper.
Remove the
right
valve
rocker
arm shaft
assembly
and
remove
the
No.
1
intake valve
push
rod
(the
second
push
rod)
and
install
a
solid
tappet-type
push
rod in its
place.
Make
sure the
push rod
is
in
the
lifter
push
rod
cup,
then install
a
dial
indicator in
such
a manner as
to
have
the
actuating
point of
the
indicator
in
the
push rod socket
and
in
the
same
plane
as
the
push
rod
movement
(
Fig.
12).
Turn the
crank
shaft
damper
slowly
in
the
direction
of
rotation until
the lifter
is on
the
base
circle
of
the
camshaft
lobe.
At
this
point
the
push
rod
will
be
in
its
lowest
position.
Zero the
dial
indica
tor and
continue
turning
the
crank
shaft
slowly
in
the
direction of rota
tion
until
the dial indicator
registers
the specified
camshaft
lobe lift (Table
3).
Compare
the crankshaft degrees
indicated on the
quadrant
with speci
fications (Table 3).
After
the
valve
opening
is
checked,
continue
to
ro
tate the damper
to
check the valve
closing.
VALVE
CLEARANCE
A
0.060
inch
shorter push
rod
is
available
for
service
to provide
a
means of
compensating
for dimen
sional
changes
in the
valve mechan
ism.
Valve stem to
rocker arm
clear
ance
should be 0.062-0.1875 inch
with
the hydraulic
lifter
completely
collapsed.
Repeated
valve
recondi
tioning
operations
(valve and/or
valve
seat
refacing)
will decrease
this clearance to
the
point
that
if
not
compensated
for,
the
hydraulic valve
lifter would cease
to
function.
To
determine
whether
a
shorter push
rod
is
necessary,
make
the
following
check:
1.
Position the hydraulic
lifter com
pressor
tool
on
the rocker
arm
and
slowly apply
pressure to
bleed down
the
hydraulic
lifter
until
the
plunger
is
completely
bottomed
(Fig.
13).
Hold
the
lifter in
the
fully
collapsed
position
and insert the clearance
gauge
(Fig.
13)
between the valve
stem and
the
rocker arm
of the
valve
being
checked.
If
the
first
step
of the
gauge
enters,
the
old
push
rod
may
be
used.
If
the first
step
will not
enter,
replace
the standard
push rod
with a
shorter
service
push
rod. If the sec
ond
step
of the gauge
enters,
the
operating
range of the lifter
is exces
sive which
indicates
that the
incorrect
push rod
has
been
installed or severe
wear
has
occurred at the
push rod
ends,
rocker
arm,
or valve
stem.
In
this
case,
it
will be
necessary
to
de
termine
the area
of
discrepancy
and
the incorrect or
defective
part(s)
should be
replaced.
Before the clear
ance
is
checked position
the crank
shaft as
outlined in
step
2
and 3.
2.
Rotate the crankshaft until No.
1 piston
is on
T.D.C.
at
the
end of
the compression stroke.
With
No. 1
piston on
T.D.C,
check
the
follow
ing
valves:
No.
1 Intake
No.
1
Exhaust
No.
3
Intake
No.
4
Exhaust
No.
7 Intake
No.
5
Exhaust
No.
8 Intake No. 8
Exhaust
3. After
these valves
have been
checked,
position No. 6
piston
on
T.D.C.
and check the
following
valves:
No. 2
Intake
No.
2
Exhaust
No. 4
Intake
No.
3
Exhaust
No. 5
Intake No.
6
Exhaust
No.
6 Intake No. 7
Exhaust

Ford Thunderbird 1958 Specifications

General

Brand	Ford
Model	Thunderbird 1958
Category	Automobile
Language	English