Mooney M20K - Page 88

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE
AND
MAINTENANCE MANUAL
(1)
Low Boost
Auxiliary
fuel
system
adjustment
(b)
Set mWure
control "FULL RICH" and
throttle
S/N
25-0001
thru
25-0780:
closed.
(a)
Install
a
calibrated
pressure gauge,
tee
into the
(c)
Conned
a
voltmeter
to
the aircraft bus.
fuel
line
between the eledric
fuel
pump
and
the
engine.
(d)
Tum
"MASTER"
switch ON and
assure
that
bus
NOTE
voltage
is
at
least
12
voBs(25-0001
thru
25-0999);(24
The fuel line
must
remain
connected
to
the
volts
for 25-1000
8
ON)
minimum.
An
e~demal
power
engine
with the
pressure
gauge
’T’ed
into
the
source
may
be
connected
to
the
aircraft
system
if
line.
voltage
is
less
than
12
volts
(25-0001
thru
25-0999);
(b)
Insure
that
the
aircraft
master
switch
is in
the
(24
volts
for 25-1000
8
ON).
OFF
position,
mixture
full
rich,
throttle
at
idle.
(e)
Turn
"LO
BOOST"
switch
ON.
(c)
Disconnect
the
eledn’cal
wire
from
the
circuit
(O
Remove
rubber
plug
from "Boost
Pump
protector.
Conned
the
negative
lead
from
an
external
Regulator"
and
adjust
tn~m
pot
for
a
calibrated
pressure
power
source
to
ground;
connect
the
positive
lead
to
gauge
reading
of 6
to
8 P.S.I.
(Reference
Figure
24-2.)
the
slide
resistor
HIGH
POSITION.
(Reference
F~ure
24-1.)
(d) Using
a
calibrated
voltmeter,
adjust
the
e~demal
power
source
to
indicate
13.75
.25
volts
(250001
thru
25-0999)
(28.6
.25
for 251000
thru
25-TEA)
direct
current
VDC)
at
the
auxiliary
fuel
pump.
Note
the
voltage reading
on
the external
power
source
voltmeter.
(e)
The calibrated
pressure
gauge
shall
indicate
23,5
to
24.5 P.S.I.
nn\
(f)
Conned
the
positive
lead
to
the
slide
resistor
LOW
POSITION.
Adjust
the
power
supply
voltage
level
to
13.75
.25
volts
(25-0001
thru
25-0999);(28.6
t~-.25
volts
for
25-1000
thru
25-TEA). Adjust
the slider
~REASE
VOLTAGE
DECREASE
VOLTAGEI(I
1
on
the variable
resistor
to
obtain
a
pump
pressure
of
6
to
8
P.S.I.
Secure
the
slider.
HIGH
POSITION
LOW
BOOST PUMP
VOLTAGE
REGULATOR
TO
PUMP
At-
I
~--LOW
POSITION
S/N 25-0781
thru 25-1230
FIGURE
24-2
LOW BOOST
PUMP
ADJUSTING
RESISTOR
NOTE
S/N
25-0001
thru
25-0780
Turn
pot
clockwise
to
increase
pressure.
NOTE
Boost
Pump Regulator
located
on
top
of
power
plant
controls
approximately
8
inches
aff of the
NOTE
face of console where
controls
come
through.
Slide
resistor
located
on
console tubular
Access
to
rubber
plug
and
adjustment
is from
structure
adjacent
to
pilots
right
knee,
behind
top
of
panel
after
glareshield
removal.
riveted
panel.
C.
High
Boost
This
switch is
located
adjacent
to
low
boost
and is colored
red.
A
protedive
cover
is
placed
over
a
to
prevent
inadvertent
activation.
The
(2)
Low
Boost
Auxiliary
Fuel
System
Adjustmen
switch
can
be held
on
for
tempomry
use or
the
cover
S/N
25-0781
thru 25-TEA.
rotated and switch
depressed
for
continuous
use
when
(a)
Install
a
calibrated
pressure
gauge
in
the fuel
engine
driven
pump
has
become
inoperative.
line
between
the electric
fuel
pump
and
the
engine.
2.
Fuel
Quantity
Gauge
Circuits.
Fuel
level
changes
NOTE
vary
fuel
quantity
transmitter resistance
that
operates
The fuel line
must
remain connected
to
the the
fuel
quantity
gauges.
The
master
switch
adivates
engine
with
the
pressure gauge
’T’ed
into
the
the fuel
quantity indicating
system.
Refer
to
Sedion
line,
2&43-00
forAdjustment
Procedures.
24-37-00
10
OLDWILLWAYNE