Raytheon Beech Baron E55 - Page 382

ci3eec~craft
BARON
55
AND
58
SHOP
MANUAL
c.
Place
the
shroud
in
position
and install
the
attach- line of
the
pump.
Adjust
the unmetered
fuel
pressure
ing
screws
and
the flexible duct.
to
12
psi
at
625
to
650
rpm,
then
reset
idle
mi~ture
to
d.
Install
the
upper
fitting
on
the
right
side and the
best
setting.
This
will
produce
a
richer mi~dure
at
take-
lower
fitting
on
the left side
of
the
pump,
off
and
at
full
throttle
operation.
e.
Install
the
intake
tube
assembly
between
the
air
PRESSURE
ADJUSTMENT,
ADJUSTABLE
metering
valve
assembly
and the
No.
2
intake,
then
ORIFICE FUEL
PUMP, IO-470-L,
IO-520-C
tighten
the
clamp.
AND
IO-520-CB
ENGINES
(Effectivity:
55,
I
f.
Connectthefuel lines.
A55, B55,
055,
D55, E55,
and
58)
g.
Install
the
air
box
if
applicable.
See
INSTALLA-
TION
OF AIR BOX
(TC-l
and
after.)
a.
Unmetered
pressure
can
be
checked
by
connect-
ing
a
test
gage
into
the fuel
pump
outlet
or
from
a
fit-
GROUND RUNNING
AND WARM-UP
ting
installed
in
the
hex
head
of
the
filter
screen
a.
Head the
airplane
into
the wind.
located
at
the
bottom
of
the
metering
control
unit.
b.
Adjust
engine
idle
speed
to
625
to
650
rpm using
b.
Operate
the
engines
on
the
ground
with
the
pro-
peller
blades
set
at
the minimum
angle thigh
rpm)
set-
the
idle
speed adjustment
on
the air
throttle
with
mix-
ting.
ture
control
in
the
full
rich
position.
Refer
to
Figure
6-6.
c.
Maintain
the
cylinder
head
temperature
between
c.
Set
the
fuel
pump
relief
valve
adjustment,
on
the
200"F
and 460"F.
Never
allow
the
cylinder
head
tem-
centerline
of
the fuel
pump,
to
9
to
11
psi by
adjusting
perature
to
exceed
460"F.
the
screw
clockwise to
raise
the
pressure
and
counter-
clockwise
to
lower
the
pressure.
Refer
to
Figure
6-7.
d.
Extended
periods
of
idling
at
low
rpm
may
result
in
fouled
spark
plugs.
d. After
adjusting
the
idle
unmetered
pressure
at
9to
11
psi,
check the
idle
mixture. Advance
the
throttle
to
e.
The Mixture
controls
should
remain
in
the
"FULL
approximately
2,000
rpm
to
clear the
engine,
then
RICH"
position
unless
leaning
is
required
during
the
back
to
idle. Move the mixture control
to
idle
cvtoff:
checkout.
the
engine
speed
should
increase
approximately
f.
Use
a
throttle
setting
of 1200
rpm
for
engine
25-50
rpm
when
the
mixture
control
is moved
toward
warmup. the
lean
position.
NOTE
e.
Advance
the
throttle to
maximum
rated
engine
speed
with
the
mixture
control
in the
full
rich
position.
An
oil
pressure
indication of
10
psi
should be noted
within
30
seconds
in
The
unmetered
fuel
pressure
should be
25
to
27.5
psi
warm
weather,
and
within
60
seconds
in
(IO-470-L
Engines)
or
28
to
31
psi
for
IO-520-C
and
1
cold weather.
If
no
pressure
is noted
IO-520-CS
Engines.
Refer
to
Chart
6-1.
within the
specified
time,
stop
the
engine
f.
To
increase the
unmetered
fuel
pressure,
turn
the
and
investigate
the
cause.
Normal oil
recessed slot-headed needle
valve
(located just
below
pressure
at
maximum
rpm
should be
the
fuel
pump
inlet
fitting)
in
a
clockwise
direction,
and
30-60
psi
and
10
psi
at
idle,
turn
in
a
counterclockwise
direction to
reduce
pres-
sure.
FUEL
SYSTEM ADJUSTMENT
IDLE
SPEED
AND
MIXTURE
NOTE
ADJUSTMENT,
IO-470-L,
IO-520-C,
Any
fuel
system
leaks
may
produce
IO-520-CB
ENGINES
(Effecfivity:
55,
A55,
erratic fuel
system
indications,
and
must
be
fixed
before
proceeding.
B55,
055,
D55,
E55
and
58)
a.
Remove
the side
cowling
and
fairing
directly
aft
of
PRESSURE
ADJUSTMENT
FIXED
it from the
left-hand
side
of
the
engine.
ORIFICE
FUEL
PUMP,
IO-470-L
(55,
A55,
b. Install
an
appropriate
pressure gage
in the
fuel
B55)
line
between
the fuel
pump
and
metering
unit
to
moni-
Fuel
pressure
on
the
fixed-orifice
pump
can
only
be
tor
pump
outlet
pressures.
This
gage
to
be
vented
to
set
by
adjusting
the
screw
located
at
the
rear
center-
atmosphere.
215
6-9