Mooney M20M - Adjustment; Filters; Hoses; Maintenance Practices

MOONEY AIRCRAFT
CORPORATION M20M
SERVICE
AND
MAINTENANCE
MANUAL
2.
Install
large
nut
on
regulator
and
tighten.
37-14-00
-HOSES
3.
Engine
compartment
install
hoses
from
pump
to
The hoses
are
of
aircraft
MIL-H-
xxx
type.
regulator
and
secure.
37-14-01
MAINTENANCE
PRACTICES
4.
Inside aircraft
install
both
instrument lines
to
regulator
and
secure.
During
engine
cleaning, protect
the
discharge
hose:
1.
Plug
end
of hose
and
Rag
it with
a
RED
"Remove
37-12-05
-ADJUSTMENT
Before
Running
Engine"
tag,
then
clean the
engine.
1.
Tee
a
calibrated
vacuum
gauge
into
system,
CAUTION
upstream
of the
regulator,
(see
Figure
37-1).
Remove
plug
prior
to
running
engine.
2.
Operate engine
at
a
minimum
of
1700
RPM.
If
vacuum
regulator
is
not set at
4.75
+/-0.25
In.
Hg.,
Periodic
check
of all
clamps
for
security
is
then
bendlocking
tab
away
from
thumb
adjustment
recommended.
screw.
Adjust
as
required.
Turning
screw
IN will
37-14-02
-SERVICING
increase
vacuum;
turning
screw
OUT will
decrease
vacuum.
Adjust
vacuum
to
read
4.75
+/-0.25
In.
Hg.
Inspect
inside
of
hose
carefully
to
make
sure
it
is
clean
and free
of
all
debris,
oils
or
solvents.
Use
vacuum
or
NOTE
air
pressure
to
clean lines.
Remove
the
hoses
from the
After
setting
regulator,
rebend tab
back
to
lock
aircraft
if
necessary
to
clean.
adjusting
screw.
37-14-03
-REMOVAL
37-13-00
-FILTERS
Replace
old,
hard,
cracked
or
brittle
hose,
particularly
All
filters,
except
the
vacuum
regulator
filter
are
of
on
the
pump
inlet.
Sections
of the
inner
layers
may
paper-pleated
material
design.
The
vacuum
regulator
separate,
causing
a
pump
failure.
filter is
a
foam-garter
design.
37-1 4-04
--REINSTALL
37-13-01
MAINTENANCE
PRACTICES
Where hose
clearance
is
tight,
making
it
difficult
to
1.
Air
filter
replacement
intervals:
(See
Section
reinstall
it
onto
the
pump
fitting,
spray
the
fitting
at
the
5-10-01)
hose end
with silicone.
LET
DRY,
then
install
hose
by
A. Vacuum
regulator,
garter,
filter
every
100
hours.
pushing
it
straight
on.
B.
Gym
instrument
filters
every
500
hours
or
at
least
once
a
year.
NOTE
2.
All
filters
require
routine
inspection
of condition
of
Do
not
wiggle
hose
from
side
to
side.
Wiggling
element and
security
of filter
in
system.
could
cause
particles
to
be
cut
from
hose
ID.
3.
All filters
must
be
changed
when
a new
pump
is
These
particles
could
damage
the
pump.
installed.
37-13-02
-SERVICING
Make
certain
hoses
are
connected
to
the
correct
All filters
require
no
service
except
routine
inspections.
fittings.
Incorrect
installation
will
cause
damage
to
the
Replace
with
new
current
configuration
filters.
gym
system.
Install
clamps
and
secure.
Optional
instrument
filters
(if
installed)
should follow
the
same
cleaning
and
replacement
schedule.
37-20-00
INDICATING
37-13-03
REMOVAL
The
indicating
system
contains
a
low
vacuum
wamlng
light,
HI/LO
VAC
in
annunciator,
which
Rashes
(RED)
1.
Vacuum
regulator
garter
filter
is
removed
by
when the
vacuum
is
below
4.25
+/-.2
In.
Hg.
and
a
stretching
it
over
and
off
the
regulator
frame,
high
vacuum
warning
light,
HI/LO
VAC
in
annunciator,
2.
The
Gyro
instrument’s
filter
is
mounted
ona
which illuminates
steady
(RED)
when
the
vacuum
bracket
under the instrument
panel
just
fon~vard
and
to
goes
5.5
(+.2-.0)
In.
Hg.
or
above.
the
right
of the
pilot’s right
knee.
37-21-00
VACUUM
SWITCH
3.
Disconnect
the
two
hoses
coming
into
the
filter
and
remove
it
from the bracket.
The
vacuum
switch
(7),Fig.
37-1,
is
located
on
either
the
Artificial
Horizon
(3)
or
Directional
Gyro
(4).
37-13-04
-INSTALLATION
The
illuminating
low
and
high
light
ADJUSTMENTS
1.
Prior
to
installing
a
new
vacuum
regulator
filter,
are
done
on
the
switch,
NOT
on
the annunciator
check
the
regulator
to
insure
that
it
is clean
from
any
panel.
foreign
material.
2.
Reinstall
new
filter in
fitting
and
secure.
CAUTION
Don’t
over
tighten;
overtightening
will crack
the
rear
housing.
4-99
37-12-05
OLDWILLWAYNE