Raytheon Beech Baron E55 - Page 454

Ral~heon
Aircraft
Company
BARON
55
AND
58
SHOP MANUAL
CO~IIBUSTION
TUBE
PRESSURE
TEST
At
each
overhaul,
pressure
test
the
combustion
tube for leaks
as
follows:
a.
Make
sure
that
all
openings
except
the combustion air
pressure
switch connection
are
plugged.
This
is
the
most
convenient
connection
for
attaching
the
test
air
pressure
source.
I
b.
Connect
a
regulated,
air
pressure
supply
to
the
opening
that
has
not
been
plugged. Apply
3
to
6
psi
to
the
combustion
tube.
c.
Submerge
the
assembly
in
water
for
several
minutes while
watching
for bubbles
that
would indicate leaks,
Turn
the
combustion
tube
in the
water
so
that
any
entrapped
bubbles
will
be
freed. Bubbles
will
indicate
leaks.
Small
leaks,
if
accessible,
can
be
repaired.
CLEANING
THE
HEA
TER
I
a.
Cleaning
the
combustion
chamber
and
radiator
assembly
can
be
accomplished
using
either
of
the
two
following
methods:
i.
Soak the
combustion
chamber
and radiator
assembly
in
a
stripper
solution
for
10 hours.
The
solution
is
made
by mixing
one
pound
of
stripper
(77,
Consumable
Material,
Chart
2)
with
each
gallon
of
water
used.
The
solution
should
be
maintained
at
a
temperature
between
190
to
210"F
during
the
soaking
period.
Flush
the
heater
thoroughly
with
water
after
it is
removed
from
the
stripper
solution.
2.
Use
a
stainless
steel
brush
or
sandblast
to
remove
any
accumulation
of
carbon
or
other
foreign
material
from the
inside
of
the
combustion
chamber. Clean
thoroughly
with
compressed
air.
I
b.
Cleaning thespray
nozzle.
1.
Disassemble
the
spray
nozzle
by unscrewing
the
fuel strainer and
two
piece
core
from
the
nozzle
body.
I
2.
Clean
the
parts
in
solvent
(78,
Consumable
Material,
Chart
2).
3.
If
soaking
fails to
thoroughly
clean
the
parts,
scrub
them with
a
soft,
nonmetallic
brush.
4.
The
grooves
in
the
core
and orifice
in
the
body,
may
be
cleaned with
a
soft
pointed
piece
of wood.
[CAUTION
I
CAUTION
I
Do
not
use
a
metal
tool
for
cleaning
the
parts
as
it will alter the flow
characteristics
of
the
nozzle.
5.
When
reassembling
the
spray
nozzle,
tighten
the
core
with
a
screwdriver
and the
strainer
with the
fingers.
I
c.
Cleaning
the
spark
plug.
1.
Before
cleaning,
examine the
spark plug
for
evidence
of cracked
or
broken
porcelain,
arcing
or
carbon
tracks
inside the
well
of the
spark plug.
If cracks
are
found,
discard
the
plug.
Arcing
or
carbon tracks
may
be
caused
by
shorting
of
the
plug
or
by
dirt
on
the
spring
connector
that
seats
in the
well
of
the
spark
plug.
In
either
case
the
fault should
be corrected
before
reinstalling
the
plug.
2.
Wipe
out
the inside
of the
well
of the
spark
plug
with
a
clean
cloth
dampened
with carbon
tetrachloride.
3.
Close
the
plug
well with
a
stopper
and
sandblast
the
plug.
Jun
27/03PagelG
SECTION
10