Ford Thunderbird 1958 - Conventional Flywheel 1-38

1-38
GROUP
1-POWER
PLANT
PLACE
Plastigage
FULL
WIDTH OF
JOURNAL
ABOUT
Va
INCH
OFF
CENTER
CHECK WIDTH OF
Plastigage
0.0015"
CLEARANCE
MEASURING
Plastigage
INSTALLING Plastigage
1558-B
1049-B
FIG
79
Installing
and
Measuring
Plastigage
Engine
in
Chassis
FIG.
80
Flywheel
Face
Runout
cap
to which
new
bearings
are
to be
installed.
Insert the upper
bearing
removal tool
(Tool
6331)
in the
oil
hole in the
crankshaft.
Rotate the
crankshaft in the direction of engine
rotation to force the
bearing
out of
the
block.
2. To
install
the upper main
bear
ing,
place the plain end of the
bear
ing
over
the
shaft on the
locking tang
side
of the
block.
Using
Tool
6331,
rotate the
crankshaft
in the
opposite
direction of engine rotation
until the
bearing
seats itself. Remove the
tool.
Replace the
cap
bearing.
Clean the
crankshaft
journal
and
bearings.
3.
Support the
crankshaft so
its
weight
will not
compress
the
Plasti
gage
and
provide
an
erroneous read
ing.
Position
a small jack so it
will
bear
against
the
counterweight ad
joining
the
bearing
which is
being
checked.
Place
a piece of Plastigage
on
the
bearing
surface the
full width
of
the
bearing
cap
and
about Va inch
off
center
(Fig.
79). Install
the
cap
and
tighten the
bolts
to
95-105
foot
pounds
torque. Do not
turn the
crankshaft
while the
Plastigage
is in
place.
Remove
the
cap,
then
using
the
Plastigage
scale,
check the
width of
the
Plastigage
at
the
widest point in
order to
get
the
minimum
clearance.
Check
the
Plastigage
at the
narrowest
point
in
order to
get
the
maximum
clearance.
The
difference
between
the
two
readings
is
the
taper.
If the
clearance is
less than
the
specified
limits,
try
two red
bearing
halves or
a
combination of
red and
blue
depending
upon the
condition.
If
the standard
bearings
do
not
bring
the
clearance within the
desired
limits,
grind
the
crankshaft
journal,
then
install
undersize
bearings.
4. After the
bearing
has been
checked
and
found
to be
satisfactory,
apply
a light coat of engine oil to the
journal and
bearings,
then
install
the
bearing
cap.
Tighten the
cap
bolts to
95-105
foot-pounds torque.
5.
If
the
rear
main
bearing
is
re
placed,
replace the lower
oil seal
(in
the
cap)
and the side
seals.
The upper
oil seal (in
the
block)
can not be re
placed
with
the
crankshaft
installed.
Connecting
Rod Bearings.
1.
Install
the
new bearings in the
connecting
rod and
cap. Pull
the con
necting
rod
assembly
down
firmly
on
the
crankshaft
journal.
Place
a piece
of Plastigage
on
the
lower
bearing
surface,
the
full width
of the
cap
and
about Va inch off
center.
Install the
cap
and tighten
the
connecting
rod
nuts to
45-50 foot-pounds torque. Do
not
turn the crankshaft while
the
Plastigage
is in place.
2.
Remove the
cap,
then
using
the
Plastigage
scale
check the width
of
the
Plastigage at
the widest point
in
order to
get
the minimum clear
ance.
Check the
Plastigage
at the
narrowest point in
order to
get the
maximum
clearance.
The
difference
between the
two readings
is
the
taper.
If
the clearance
is less than the
specified
limits,
try
two
red
bearing
halves or
a
combination of red
and
blue
depending
upon the
condition.
If the standard
bearings
do
not
bring
the clearance within the desired
limits,
grind the crankshaft
journal,
then
install
undersize
bearings.
After
the
bearing
clearance
has
been checked
and found to be
satis
factory,
apply
a light
coat of engine
oil to the
journal and
bearings,
then
install
the
connecting
rod
cap. Tight
en the nuts
to 45-50
foot-pounds
torque,
then install
the pal
nuts,
and
tighten
them to
3-4
foot-pounds
torque.
3.
Repeat
the
procedure for the
remaining
connecting
rods that
re
quire
new
bearings.
CONVENTIONAL
FLYWHEEL
INSPECTION
Inspect
the
flywheel for
cracks,
heat
check,
or
other defects
that
would make it
unfit for
further
serv
ice.
Machine
the
friction
surface
of
the flywheel
if it is
scored
or worn.
If it is
necessary
to remove
more
than
0.045 inch of
stock
from
the
original
thickness,
replace the
flywheel.
Inspect
the
ring
gear
for
worn,