Ford 1955 Shop Manual page 16

14
Chapter
I
General Engine Repair
casting
defects
which
would make
the
manifold unfit
for
further
service.
Inspect
the
exhaust
manifold
for burned
out spots,
cracks,
deep
nicks, and scratches.
b. Repairs.
Dress
nicked
or warped
mating
surfaces on a surface
plate.
Minor
nicks,
burrs,
or scratches
may
be
removed
with
a
file.
Remove
all
obstructions
from
the
intake
manifold
passages.
Replace
cracked or
severely
warped
manifolds
and
those
manifolds which contain
unremovable obstruc
tions.
Replace defective
exhaust
manifolds.
CAUTION: Remove
all
filings
and
foreign
matter
that
may
have
entered
the
manifold as a
result of
repair work.
Holding
fixture' PUSH ROD
Fig.
5
Push Rod Runout Check
6263
5.
ROCKER
MECHANISM,
CYLINDER
HEAD, VALVES,
VALVE LASH
ADJUSTMENT,
AND VALVE TIMING
Check
the
push rods
for bend between ball
and
cup
centers with a
dial indicator (fig. 5). Check the
ball
end
and socket end of
the
push rods
for
nicks, grooves,
or
roughness.
NOTE:
A
rough check
for bent
push
rods can
be
made while they are
installed in
the
engine
by
rotating
them
(valve
closed)
and
observing
the
runout.
If
any
runout
is
observed,
be
sure
to
check
the rod
between
centers as
described
above.
(2)
REPAIRS. If
the
clearance
between
the
shaft
and
rocker arms exceeds
.004
inch,
replace
the
shaft
and/or
the
rocker
arms.
Replace
all rocker
arms
that
have
severely
scored or scuffed
bores
and/or grooved
pads.
Replace
all
severely
scored or
scuffed rocker shafts.
Dress
up
minor nicks
or scratches.
Replace
all
damaged
rocker arm
lock
nuts,
adjusting screws,
and springs.
Replace the
oil
drain
tube
if it is
cracked
or
has
a
sharp
bend.
If
the total
runout of a push rod exceeds
0.020 inch,
at
any point,
discard
the
rod.
Do
not attempt
to
straighten
push rods.
b. Cylinder Head.
Remove
the
cylinder
head.
(
1
)
CLEANING AND INSPECTION. Remove
carbon
deposits from
the
combustion chamber and valve
heads
with a scraper and a wire
brush. Be
careful not
to
scratch
the
gasket surface.
Clean
the
gasket surface
with solvent
to
remove
any
gasket sealer.
This
s
tion
covers
the
inspection
and repair proce
dures
applicable
to the
rocker
mechanism,
cylinder
head,
and valves.
In
addition, the
methods used
to
check
valve
timing
are given.
a.
Rocker Mechanism.
Remove
and
disassemble the
rocker mechanism.
(
1
)
CLEANING AND INSPECTION. Check
the
I. D.
of
the
rocker arm
bore
and
the
O. D.
of
the
rocker arm
shaft,
at
the
location
of
the
rocker arms,
against specifi
cations.
Make
sure
these
surfaces are
free
of scuffs, scores,
nicks,
or scratches.
Inspect
the
rocker arms
for
grooved
pads.
Check
the
rocker
adjusting
screws and
lock
nuts
for
stripped or
broken
threads
and
the
ball
end of
the
screw
for
nicks and scratches.
Make
sure
the adjusting
screws
turn
freely
in
the
rocker arms.
Inspect
the
locating
springs
for
cracks or other signs
of
failure.
Inspect the
oil
drain
tube
for
cracks or sharp
bends.
\D,(3)
check diagonally
(5)
CHECK ACROSS CENTER
6262
6264
Fig.
6
Checking
Flatness
of
the Cylinder Head
Gasket
Surface
Fig.
7
Checking Flatness
of
the
Intake Port
Mating
Surfaces