Adjusting Fuel Quantity Gages; Carburetor Adjustment; Fuel Injection System Adjustment; Adjusting For Oil Pressure Fluctuations - Beechcraft TRAVEL AIR 95 Shop Manual

ADJUSTING
FUEL QUANTITY GAGES
is any evidence
of
corrosion when
the
drain plug is
removed,
the
carburetor
should
be
removed for
On aircraft
prior
to
TD-143
and on aircraft
TD-403 overhaul,
and after,
the
adjustment is
made
by removing
the
liquidometer access
covers
from
the tanks
and bend-
ing
the
float wire up or
down
slightly
to
obtain
the
FUEL
INJECTION
SYSTEM
ADJUSTMENT
(Effec-
proper reading
in both
the
full
and empty
tank
condi-
tive
airplanes
TD-127,
TD-444,
TD-453
thru
TD-533
Except TD-506)
tions.
NOTE
Two adjustments can be made
on
the
fuel injection
system throttle
body--idle
speed and air bleed
ad-
Do not raise
the
outboard
transmitter
float
justments.
The adjustable
linkage between
the
when
tank
is empty in either
the
31 gallon
throttle
butterfly
shaft and
the
mixture
control is
.
preset
and should not be altered,
auxiliary
tanks
or
the
39
gallon main
tanks,
except when power is
off.
Idle rpm is
ad
usted
by a stop
screw
adjacent
to
the
On aircraft
TD-143 thru
TD-402,
potentiometers
throttle control
arm. Turning
the
screw
clockwise
located in
the
firewall above
the
rudder
pedals are
increases
idle
rpm.
Normal idle speed is 500
to
adjusted
to
give
the
proper
gage
reading. Each gage
650 rpm.
should be
adjusted with a full
tank;
adjusting
the
gage
To correct for rough
idle, move
the mixture
control
to the full position will correct
the
reading
in
the
other
.
toward
Idle Cut-off.
If a momentary gain in idle rpm
needle position.
When adjusting
the
gages
28 volts
'
should
be applied
to
the system.
Loosen
the
locknuts
followed by a drop
in rpm, is noted,
the
mixture is
-
too
rich. An immediate drop in rpm indicates the
on
the
potentiometer adjusting
screw
and adiust
the
mixture is
too
lean.
Adjust
the
air bleed adjustment
screw
so
that the
gage needle
moves
to the
full posi-
screw clockwise to
enrich or counterclockwise
to
tion.
The adjustment screw
is located on
the lower
. lean
the
mixture until
satisfactory
idle
is obtained.
end
of
the
potentiometer.
CARBURETOR ADJUSTMENT
(Effective airplanes
FUEL
INJECTION SYSTEM
ADJUSTMENT
(Effec-
prior
to
Serial TD-453, Except
TD-127
and TD-444)
tive
airplanes
TD-506,
TD-534
and
after)
Except for idling adjustment,
all other functions of
the
Adjust
the throttle
control
arm
stop screw
to
obtain
carburetor
are adjusted at
the
factory. In adjusting
an idle speed of
approximately
650
rpm.
the
idle mixture and speed allow the
engine
to
warm
up and set
the throttle
stop screw so
that the engine
Check
the
idle mixture by moving
the
cockpit
mix-
idles at approximately
550
rpm. Turn
the
idle
adjust-
ture
control
lever with a smooth,
steady pull
to-
ing
screw
toward the
rich position
till the
engine rolls
ward
Idle Cut-off
and observe the tachometer
for
from richness
then turn
the
screw
toward the
lean
any
change.
Return
the
mixture control
to
Full
position
till the
engine runs
irregularly from
lean-
Rich before the
rpm drops to
a point where the
ness,
this
gives
an idea
of
the
idle
adjustment
range
engine
cuts out.
An increase of more
than
25 rpm
and
extreme
engine operating conditions.
Starting
during "leaning out" indicates
the
idle
mixture
is
from
the
lean position,
turn
the
screw
toward the
too
rich. An immediate
decrease in rpm (if not
rich setting
just far
enough
to
prevent
the
rich roll
preceeded
by a momentary increase
in rpm)
indi-
and uneven
running from
richness. This
adjustment
cates
the
mixture is
too
lean.
will in most cases give
a slower
idle speed
than
a
slightly leaner adjustment, with
the
same
throttle
The Idle mixture
adjustment is a
thumbscrew
in
the
stop
screw setting,
but
will
give
smoother
idle
op-
linkage between
the throttle
control arm and
the
idle
eration.
valve lever. Lengthening
the
linkage leans
the
idle
mixture and
shortening
the
linkage enriches
the
mix-
To check
the
idle
adjustment,
run up
engine to
clear
ture.
Each
time the
adjustment is changed, clear
the
spark plugs and
then
slowly move
throttle
back
to
engine by running it up
to approximately
2000 rpm
closed
position.
Slowly
move mixture
control
into
full
and repeat
the
mixture
check.
Adjust the
engine idle
lean
position
and observe
the tachometer
for a
rise
speed as required after
the
mixture is set.
in rpm. If
the
adjustment
is correct
there
will be
a
pickup in rpm, but it should not exceed
15
rpm.
U the
idle mixture setting
does not remain stable,
check
the
idle linkage
for
looseness or wear.
Any
looseness in
the
linkage
can
cause rough idling.
CARBURETOR SERVICING
(Effective airplanes
prior
to
Serial
TD-453
Except
TD-127 and
TD-444) ADJUSTING FOR OIL PRESSURE FLUCTUATIONS
The
carburetor
should
be drained
and
the
fuel
inlet
The function of
the
oil pressure
relief
valve is
to
screen
cleaned at least
every 100
hours.
The
fuel
maintain
engine oil
pressure within specified limits
inlet strainer assembly,
located on
the
upper
right
by withdrawing a
portion
of
the
oil from
the cir-
hand
side of
the
carburetor,
should
be removed culating
system and returning
the
oil
to the
sump
and
the
screen
cleaned
with an
air
blast.
If
there
should
the
pressure
become excessive.
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