Mooney M20K - Distribution; Fuel Boost Pump Removal and Installation

SERVICE AND MAINTENANCE
MANUAL
M20K MOONEY
AIRCRAFT
CORPORATION
taper
ends
of
existing
sealant
so
that
new
sealant
can
CAUTION
form
a
continuous
and
smooth
overlap.
Ethylene
glycol monomethyl
ether
(EGME)
or
other
(3)
Thoroughly
clean
repair
area
using
Turco
657
additives
are
not
recommended
due
to
potential
Wipe
Solvent
or
MEK.
Wash
one
small
area
at
a
time.
deteriorating
effects
within the
fuel
system.
To
prevent
redeposit
of oil and dirt
on
surface,
dry
with
28-20-00 DISTRIBUTION
a
clean
cloth before solvent
evaporates.
Always
pour
solvent
onto
wash
cloth
to
prevent
contamination
of
The
fuel
system
is
comprised
of
two
fuel
pumps,
an
solvent
supply;
do
not
dip
cloth
into
solvent. engine
driven
gear
type
pump
and
an
electrically
driven
auxiliary
boost
pump.
The
boost
pump
is
(4)
Thoroughly
dry
clean
area
py
blowing
filtered
connected
to
three
separate
switches
on
the
air
over
immediate
area
until
there
Is
no
possibility
of
instrument
panel.
The
LO
boost
is
used
to
purge
fuel
solvent
or
fuel
entrapment
under
adjacent
sealant.
vapor
bubbles
when
operating
at
extreme
high
(5)
Apply
sealant
as
required
for
repair (See
temperatures
or
e~reme
high
altitudes,
if
necessary.
Figure
28-3).
Repaired
fillets
must
be
blended into
The
HI boost is
used
to
provide
sufficient
fuel
pressure
ex7sting
fillets
with
a
spatula
or an
appropriate
tool.
to
operate
the
engine
at
approximately
76016
power
in
(6)
Allow
all
repaired
sealant
to
cure
tack-free
case
of
engine
driven
fuel
pump
malfunction.
and
apply
two
brush
coats
of
PR 1005-L
to
repair
area
On
S/N 25-0001 thru
25-1225
the
primer
switch
(Refer;
to~patagraph
28-11-00,4,D).
energizes
a
valve
on
the
engine
and
tums
on
the boost
28-13-00
-SOAPLESS BUBBLE
FLUID
pump
to
supply
atomized
fuel
to
the
engine
induction
FORMULA PREPARATION
FOR
LEAK
system
for
engine starting.
CHECK
On S/N 25-1226 thru
PSITBA
the
pn’ming
is
1. Materials.
accomplished
by pressing
the
LO
boost
pump
switch
ON,
with
M’octure control
in
Idle-~ut- Off.
Use
the Prime
A.
Three
ounces
of
either
sodium
bichromate, vs
Temperature
chart
in
the
M20K POH/AFM.
potassium
chromate,
or
potassium
dichromate.
The
engine
driven
pump
incorporates
a
by-pass
which
B.
Three
and
one-quarter
ounces
Thickening
Wax
allows
excess
fuel
to return
to
the
supplying
tank
(Carbo
Wax
1500).
through
a
separate
retum
line.
C.
Thirteen
ounces
Alkaryl
Sufonate
wetting
agent.
28-21-00 FUEL BOOST PUMP
REMOVAL
AND
D.
Distilled
water.
INSTALLATION
2.
Solution
Preparation.
1.Auxiliary
Electn’c Boost
Pump
Removal.
A.
Mix
one
of the
compounds
listed in item
(A)
A. Remove
eledn’cal leads.
above with
one
cup
distilled
water.
B. Turn
fuel
selector valve OFF.
B.
Mix item
(6)
above with
one
cup
distilled
water.
C. Disconnect
inlet and
outlet fuel lines.
C.
Mix item
(C)
above with four
to
four and
one
half
D. Remove
fuel
pump.
gallons
distilled
water
until
wetting
agent
dissolves
completely.
2. Reverse the removal
procedure
for reinstallation.
D.
Mix
the
three
ingredients
(A), (6)
and
(C)
CAUTION
together
and
add
enough
distilled
water
to
make five
Do
not
run
pump
dry
for
more
than 15 seconds.
gallons
ofsolution.
3.
Adjust voltage
for low boost
pump
operation
to not
aaceed
NOTE
8
PSI
fuel
pressure.
This
~tage
wlllvarywith
incrividual
pumps.
Amount of each
ingredient
may
be
reduced
for
See Section
2437-00
pocedures.
a
smaller
quantity
of
solution.
Solution life
is
about
one
week.
NOTE
8 PSI is
maximum
fuel
pressure
to
be
supplied
CAUTION
to
engine
when
engine
fuel
pump
is
operating
Soapless
bubble fluid is
slightly
corrosive and
in
low
mode. Install
calibrated
gauge
in fuel
must
be
completely
removed
by washing freely
line,
with
T-fitting
between
boost
pump
and
with
water
followed
by
scrubbing,
engine
driven fuel
pump.
See
detailed
CAUT(ON
instructions
in
chapter
24-37-00,
paragraph
1.
S/N
259447 and later model aircraft: When
B.
(1)
and
12).
removing
lower
inboard
access
panels,
caution
CAUTION
should
be exercised
during
removal
so
fuel
Mixture
control
should
be
in
FULL RICH
outlet tubes will
not
be
damaged
or
bent.
position
to
check
operating
pressure,
however
28-14-00
FUEL
ADDITIVES
do
not
operate
the boost
pump
for
more
than
a
few seconds
to
prevent
excessive
flooding
of
Under
certain conditions
of
temperature
and
humidity,
the
engine.
water
can
be
present
in
the
fuel
in
sufficient
quantities
to
create
ice
formations
within
the
fuel
system.
To
NOTE
prevent
this,
add
Anhydrous
ISO-PROPYL
Alcohol
to
When the
aircraft willnot
be flown for
a
period
the
fuel
supply
in
quantities
not to
exceed
3% of total
of
time,
refer
to
Sections 10-1
0-01,10-1
0-02
3
fuel
volume
per
tank.
(Refer
to
TCM S.B. No.
M82-8).
1
0-10-03.
28-1
3-00
10
OLDWILLWAYNE