Ford Thunderbird 1958 User Manual

PART
1-ENGINE
1-37
DIRT IMBEDDED
INTO
BEARING
MATERIAL
SCRATCHES
SCRATCHED BY DIRT
LACK
OF OIL
IMPROPER
SEATING
OVERLAY
GONE
FROM
ENTIRE
SURFACE
TAPERED
JOURNAL
FIG.
77
Bearing
Failures
RADIUS
RIDE
RADIUS
RIDE
CRATERS
FATIGUE
FAILURE
1030-A
If the
gap
is less
than
the recom
mended
lower
limit,
try
another
ring
set.
FITTING
PISTON
PINS
The piston pin fit should be
a
light
thumb press
fit at
normal tempera
ture
(70
F). Standard piston
pins
are
color
coded
green. Pins of
0.001-
inch oversize
(color
coded
blue)
and
0.002-inch oversize (color coded
yel
low)
are
available.
If the pin hole in the piston
must
be
reamed,
use an
expansion-type,
piloted
reamer. Place the
reamer in
a vise and revolve the
piston around
the
reamer.
Set the
reamer
to the
size of
the pin
bore,
then expand the
reamer
slightly
and
trial
ream
the pin
bore. Take a light cut. Use a
pilot
sleeve of the nearest
size to maintain
alignment of the
bores.
Check the hole
size,
using
the
new
piston
pin.
If the bore is
small,
ex
pand the
reamer
slightly
and
make
another
cut. Repeat the procedure
until
the
proper fit is
obtained.
Check
the
piston pin for fit in the respective
rod
bushing.
If
necessary,
ream or
hone the
bushing
to
fit
the pin.
Install
the
piston pin in
the
piston
and
rod.
Install a new
retainer
at
each end
of
the
pin to hold it
in
place. Spiral the
retainers
into
posi
tion
with the
fingers.
Do not
use
pliers. Make
sure
the retainers are
properly
seated
in
their
groove.
MAIN
AND
CONNECTING
ROD
BEARINGS
CLEANING
AND INSPECTION
Clean the
bearing
inserts
and
caps
thoroughly.
Inspect each
bearing
carefully.
Bearings
that
have a
scored,
chipped,
or worn surface
should be
replaced. Typical examples
of
bear
ing
failures
and
their causes are
shown
in
Fig.
77.
Check
the
clear
ance
of
bearings
that appear to
be
satisfactory
with Plastigage. Fit
new
bearings
following
the recommended
procedure.
BEARING
REPLACEMENT
The
main
bearing
inserts
are
selec
tive
fit
and do not
require
reaming
to
size
upon
installation.
Do not
file
or
lap
bearing
caps or use shims to
obtain
the
proper
bearing
clearance.
Selective
fit bearings
are available
for
service in
standard
sizes only.
Standard
bearings
are
divided
into
two sizes and
are identified
by
a
daub
of
red
or
blue paint.
Red
marked
bearings
increase the
clearance;
blue
marked bearings
decrease
the clear
ance.
Undersize
bearings,
which
are
not
selective
fit,
are
available for use
on journals that
have
been
reground.
Normally,
bearing
journals wear
evenly
and are not out-of-round.
However,
if a
bearing
is
being
fitted
to
an
out-of-round
journal,
be sure
to
fit the
bearing
to the
maximum
PLACE PLASTIGAGE FULL WIDTH
OF
JOURNAL
ABOUT
V. INCH
OFF
CENTER
diameter of
the
journal.
If
the
bear
ing
is
fitted to
the
minimum
diame
ter
with
minimum
clearance,
interfer
ence
may
result,
causing
an
early
failure.
It is
not
recommended
that
bearings be
fitted
to
a
crankshaft
journal
which
exceeds the
maximum
out-of-round
specifications.
When re
placing
standard
bearings
with
new
bearings,
it is good
practice
to
first
try
to
obtain the
proper
clearance
with two
blue
bearing
halves.
Do
not
get dirt or
other
foreign
matter
under the
inserts. In time
the
dirt
may
distort
the
bearing
and
cause
bearing
failure.
Main Bearings. The
following
pro
cedure
is for
the engine installed
in
the
chassis with the crankshaft not
removed.
If the engine is
on
a work
stand,
follow
steps 2-5.
In
step
4,
it
is not
necessary
to support
the crank
shaft
because
the engine will
be
in
verted.
Place
the Plastigage
on
the
crankshaft
journal (Fig.
78)
instead
of on
the
bearing
surface
if
the en
gine
is
on a
work stand.
1. Replace
one
bearing
at a
time,
leaving
the other
bearings
securely
fastened.
Remove the
main
bearing
CHECK
WIDTH OF
PLASTIGAGE
0.002
CLEARANCE
INSTALLING PLASTIGAGE
MEASURING
PLASTIGAGE
1031
-A
FIG.
78~~
mstamn9
and
Measuring
Plastigage
Engine
On
Work
Stand

Ford Thunderbird 1958 Specifications

General

Brand	Ford
Model	Thunderbird 1958
Category	Automobile
Language	English