Mooney M20M - Maintenance Practices; Reinstall; Removal; Servicing

SERVICE
AND
MAINTENANCE
MANUAL
M20M
MOONEY
AIRCRAFT
CORPORATION
Seals
in
front
frame of
housing
behind
coupling
are
7.
Always
replace
ALL
locking
washers
when
designed
to
keep
out
foreign
material
such
as
dirt,
installing
a new
pump.
Tighten
all four
(4)
mounting
dust and
light
fluid.
However,
fluid
under
high
pressure
nuts
90
to
110
in.
Ibs.
can
be
forced
past
seals and
enter
pump.
8.
Prior
to
reconnecting
hoses,
inspect
inside
of
2.
Dry
air
pump
fittings.
Before
washing engine
off,
hose
carefully
to
make
sure
it is
clean
and
free of all
check
pump
fittings
for
looseness
of threaded
fittings.
debris,
oils
or
solvents.
Use
vacuum
or
air
pressure
to
Fluid
can
seep
through
loose
threads and
enter
clean all
lines.
Remove hoses
from aircraft
if
pump.
necessary
to
clean.
3.
Dry
air
pump
discharge
hose
(vacuum
instrument
When hose clearance
is
tight,
making
it
difficult
to
system).
Plug
end
of
hose
or
fitting
and
flag
it
with
a
reinstall
onto
pump
fitting,
spray
fitting
at
hose
end
RED
"Remove
Before
Running Engine"
tag,
then clean
with silicone.
LET
IT
DRY,
then install hose
by
pushing
engine.
it
straight
onto
fitting.
CAUTION
CAUTION
Remove
plug prior
to
running
engine.
Do
not
wiggle
hose
from
side
to
side
during
placement.
Wiggling
could
cause
particles
to
37-11-02
SERVICING
be
cut
from
hose Ib.
These
particles
would
The
dry
air
pump
requires
no
servicing.
The
internal
damage
the
pump.
parts
are
self-lubricating
and
require
NO
ADDITIONAL
lubricating.
CAUTION
Change
all filters
in
the
system.
This
must
be
37-11-03
-REMOVAL
done
or
pump
warranty
MAY BE VOIDED.
1.
Disconnect
hoses
from
dry
air
pump.
37-12-00
VACUUM
REGULATOR
2.
Remove
main air
pump
from
engine
and
discard
Th,
vacuum
regulator
(2)
(Figure
37-1)
is
a
old
mounting
gasket
and
locking
hardware.
spring-controlled
diaphragm
valve
for
regulating
3.
Remove
fittings
from
pump.
Retain
fittings
if
they
vacuum
for the
aircraft
pneumatic
instrument
system.
are
serviceable;
clean
thoroughly
before
reusing.
The
vacuum
regulator
is
located
on
left-hand
side of
Discard twisted
fittings
and
any
nuts
with rounded
firewall,
inside
cabin,
just
under
glareshield. Adjust
corners.
vacuum
regulator
valve
according
to
Section
37-12-05.
4. Pad
inspection.
Check
condition
of
the AND
37-12-01
MAINTENANCE PRACTICES
20000
pad
seal.
If
seal shows
any
signs
of oil
leakage,
replace
seal.
Replace
seal
if there is
any
doubt
as
to
Check
general
condition
of
regulator
to
insure
it
is
its
serviceability,
secure
and
in
airworthy
condition.
37-11-04
INSTALLATION
OF
NEW
PUMP
37-12-02
SERVICING
(Main
or
Stand-by)
No
servicing
is
required
on
regulator
other than
filter
CAUTION
replacement.
See
Section 37-13-00
for
details.
Never
install
a
pump
that
has been
dropped.
37-12-03
REMOVAL
1.
Consult airframe
manufacturer’s
current
Parts
1.
Underneath
the
instrument
panel,
remove
both
Catalog,
Airborne’s
Application
List,
or
the
PMA
label
instrument
lines from
vacuum
regulator;
cap
off
to
on
pump
box
to
verify
that
pump
is
correct
model
for
prevent
foreign objects
from
entering
them.
the
engine
and/or
system
application.
remove
hoses
from
2.
Engine
compartment
2.
Place
pump
mounting
flange
in
a
jaw-protected
vacuum
regulator;
cap
off
to
prevent
foreign objects
vise,
with
the drive
coupling
downward.
Protect
pump
from
entering.
mounting
flange
with soft
metal
or
wood.
3.
Loosen and
remove
large
nuts
at
firewall
on
CAUTION vacuum
regulator.
Pump
housing
should
never
be
placed
directly
4.
Pull
regulator
aft
to
remove
from
aircraft.
in
a
vise,
since
clamping
across
the
center
housing
will
cause
an
internal
failure
of the
37-12-04
REINSTALL
carbon
rotor.
1.
Inside
aircraft
insert
vacuum
regulator
thru
3.
Spray
fitting
thread with
silicone
and
LET IT
DRY.
mounting
hole in
firewall.
DO NOT
use
teflon
tape,
pipe
dope
or
thread
lube.
4. Install
fittings
in
the
pump.
Hand
tighten initially.
5.
Use
only
a
box
wrench
to
tighten fittings
to
desired
position.
DO
NOT
make
more
than
one
and
one
half
(1 1/2)
turns
beyond hand-tight
position.
6.
Install
new
pump
mounting
gasket
(supplied
with
new
pump).
(NOTE:
No
gasket
is
required
between
stand-by
pump/clutch
assembly
and its
adapter
plate
mounting
pad.)
37-11-02
4-99
OLDWILLWAYNE