Operator`s manual

OVERHAUL
MANUAL
LYCOMING
DIRECT
DRIVE
AIRCRAFT
ENGINES
Section
8
Oil
Sump
and
Fuel
Induction
SECTION
8.
OIL
SUMP
AND
FUEL
INDUCTION
8-1.
General.
To
accomodate
the
number
of engine
models,
covered
inthis
manual,
a number
of
oilsump
configurations
are
employed.
Basically
all
oil
sumps
are
similar
and
overhaul
procedures
will
apply
to
all
models
unless
specifically
called
out
to
the
contrary.
8-2.
Various
carburetors
and
fuel
injectors
are
em-
ployed
on
the
engine
models
covered
in
this
manual.
No
attempt
will
be
made
to
describe
their
overhaul.
Overhaul
information
for
these
trade
accessories
may
be
obtained
from
their
respective
manufacturers.
8-3.
Two
methods
of
assembling
intake
pipes
are
em-
ployed.
One
method
employs
a
plain
end
intake
pipe
and
connections
in
the
oil
sump.
The
second
method
employs
a
flanged
end
which
is
assembled
directly
into
the
oil
sump
or
induction
housing.
DISASSEMBLY
8-4.
Intake
Pipes.
Loosen
and
remove
the
capscrews
that
attachthe
intake
pipe
flange
to
the
cylinder
intake
port.
Depending
on
installation,
either
loosen
hose
clamps
and
slide
intake
pipe
off
connection
or
pull
in-
take
pipe
from
the
sump
or
induction
housing.
Discard
the
"O"
rings.
Mark
the
intake
pipes
as
they
are
re-
moved
from
the
engine
so
they
may
be
reassembled
in
the
same
location
from
which
they
were
removed.
Engines
employing
tunes
induction
will
have
intake
pipes
matched
in
length
and
diameter.
8-5.
Carburetor
or
Fuel
Injector.
Remove
the
carb-
uretor
or
fuel
injector
from
either
the
air
inlet
hous-
ing
or
from
the
mounting
pad
on
the
sump.
Remove
the
air
inlet
housing
on
installations
employing
same.
Carburetor
or
fuel
injector
mounting
pads
may
be
in-
corporated
on
either
the
bottom,
front
or
rear
of
the
oil sump.
8-6.
Oil
Suction
Screen.
See
figure
8-1
thru
8-4.
The
oilsuction
screen
housing
maybe
found
at
any
number
of
locations
on
the
sump.
Unscrew
the
hex
head
plug
and
remove
gasket
and
oil
suction
screen.
8-7.
Induction
Housing
(IO-540,
TIO-540).
See
figure
8-3.
Remove
the
air
inlet
housing
from
the
sump
and
induction
housing.
Remove
the
induction
housing
from
the
bottom
of
the
sump.
Remove
the
studs
(14)
and
clamps
(15)
that
secure
the
intake
pipe
extensions
and
remove
the
extensions
(16).
8-8.
InductionHousing
(IO-720-A,
-C).
Seefigure
8-4.
Remove
the
induction
housing
(8)
from
the
bottom
of
the
sump.
8-9.
Induction
Housing
(IO-720-B).
Remove
the
air
inlet
housing
from
the
induction
housing.
Remove
the
induction
housing
cover
and
the
induction
housing.
Remove
the
studs
and
clamps
that
secure
the
intake
pipe
extensions
and
remove
the
extensions.
8-10.
Oil
Sumps
-
Remove
the
fastenings
from
the
periphery
of
the
sump
and
remove
the
sump.
C LEANING
8-11.
Oil
Sump-
Clean
the
sump
according
to
the
general
instructions
contained
in
Section
3.
Clean
the
oil
passages
with
solvent
and
a
suitable
brush
and
blow
out
with
compressed
air.
Do
not
clean
the
oil
suction
screens
until
they
have
been
inspected
for
metal
particles.
8-12.
Carburetors
-
Clean
the
carburetors
in
accor-
dance
with
the
manufacturer's
instructions.
8-13.
Fuel
Injectors
(Bendix).
Remove
and
clean
the
fuelinlet
screen
on
strainer.
Clean
the
strainer
inun-
leaded
gasoline
or Varsol
cleaning
fluid.
8-14.
Fuel
Injector
(Simmonds).
Clean
all
exposed
surfaces
of
the
fuel
pump
and
throttle
body
assemblies
with
a
dry
lint
free
cloth.
8-15.
InjectorNozzles
-
(Simmonds).
To
cleannozzle
orifices
use
a stream
of
dry
compressed
air.
Do
not
use
a
probe
of
any
kind
to
clean
nozzle
orifices.
8-16.
Injector
Nozzles
-
(Bendix).
Remove
the
nozzle
and
submerge
it in
cleaning
solvent
(Stoddard
Solvent,
Methyl
Ethyl
Ketone
or
equivalent).
Remove
nozzle
from
solvent,
and
dry
with
clean,
dry
compressed
air.
Under
normal
conditions,
the
shield
and
screen
are
NOT
removed
from
the
nozzle
assembly.
However,
if
either
the
shield
or screen
are
removed
from
the
noz-
zle,
both
must
be
thoroughly
cleaned
prior
to
reas-
sembly
and
the
shield
must
have
a
tight
fit
on
body
when
installed.
NOTE
At
no
time
is
it
permissible
to
use
a
sharp
tool
such
as
a
wire
to
clean
out
an
air
bleed
nozzle.
INSPECTION
8-17.
Inspect
the
sump
according
to
the
general
in-
structions
contained
in
Section
3.
8-18.
OilSuction
Screen.
Before
cleaning
the
screen,
inspect
for
evidence
of
metal
particles,
which
could
serve
as
an
aid
to
locate
deterioration
in
some
section
of
the
engine.
Inspect
screen
for
distortion
or
open-
ings
of the
mesh.
Revised
May,
1972
8-1