Mooney M20M - Engine Set up Requirements

MOONEY
AIRCRAFT
CORPORATION M20M SERVICE
AND MAINTENANCE
MANUAL
(3)
Adjust
the
idle
speed
adjusting
screw
until
measured. There
is
now
additional
adjustment
range
contact
is
made
wit~
the throttle
arm
stop.
See
Figure
and the
reference
pdnt
is
retained.
71-1.
(5)
Each
time
an
adjustment
is
changed,
clear
NOTE
the
engine
by running
it
up
to
approximately
2000
RPM
Fuel
flow
will
vary
with
temperature
changes.
before
making
a
mixture
or
idle
RPM check.
Temperature
variations
from
NACA STANDARD
(6)
Recheck
as
required
to
insure
the idle mixture
DAY
temperature
causes
approximately
.7
is
adjusted
within limits
specified
above. Allowance
Ibs./hr.
fuel
flow
change
with each
1
degree
C.
should
be
made
for
weather
and
field
altitude
when
variation
(minus
if
hotter,
plus
if
cold~er).
adjusting
idle
mixture.
If
RPM
changes
appreciably
after
making
idle
mixture
NOTE
adjustment
during
the
succeeding
steps,
readjust
as
If
above
procedures
do
not
result
in
stabilized
necessary,
idle
speed,
check
idle
linkage
for
looseness.
B.
IDLE
MIXTURE
ADJUSTMENTS
71-00-52
ENGINE SET-UP
REQUIREMENTS
(1)
Stabilize
idle
speed;
slowly,
but
positively,
move
mixture
control
from full
rich
toward IDLE
1.
Check
all fuel
lines,
reference
lines,
gauge
lines
CUT-OFF.
Engine
speed
should increase
25
to
50
and
electrical
connections
for
proper
routing
and
RPM
before
beginning
to
drop
toward
zero.
security
of
fittings.
(2)
Observe
tachometer
for
any
change during
Remove the
7/16-20
plug
located
at
the
left hand
port
the
leaning
process.
If
engine
RPM
increase
is
less
of
induction air
duct downstream
of
the
injector
(Ref.
than
25
RPM,
adjust
idle mixture
adjustment
(Figure
Figure
71-2).
Install
Mooney
P/N
GSE050012-501,
71-1)
to
enrich the
mixture.
If
engine
RPM
increase is
Temperature
Probe
Assembly
into
this
port
(Lycoming
more
than
50
RPM,
adjust
idle mixture
to
lean
the
SI
1187(G)
altemate
method).
Route
wiring
back
along
mixture.
aircraft,
through
pilot’s
storm
window;
place
readout
indicator inside
cockpit
where
it
will
be
secure
and
An immediate
decrease
in RPM
(not
preceded
by
a
easily
read.
Secure
wiring
to
prevent
damage by
momentary
increase)
indicates the
idle
mixture is
on
propeller
wash.
the
LEAN
side
of
best
power.
CAUTION
Return
the mixture control
to
FULL
RICH
position
before
RPM
drops
to
a
point
where the
engine
quits.
(3)
Adjust
idle
mixture
to
obtain
a
rise
of
25
to
50
RPM
during
the
above
leaning
exerci~e.
This
adjustment
is made
by
lengthening (richening)
or
shortening (leaning)
of
the
linkage
Propeller
Governor
Adjustment
between
the
throttle lever and
idle
(High
RPM
Stop>
valve
lever
tone
or
two
tums at
a
time
is
recommended).
For
easy
reference,
consider
only
the
coarse
thread end. When
it
is
tumed
OUT of
its
block,
thel( \\ln\~w\\n RI’""
linkage
becomes
LONGER and
a
RICHER
mixture
is
provided.
When
it is
tumed
INTO
its
block,
the
linkage
is
SHORTENED
and
a
LEANER
mixture is
provided
(Ref.
Figure71-1).
(4)
Additional
adjustment
is
available
for
use
when
the
center
screw
bottoms
out
on
either
side of the
blocks and
the
idle
adjustment
is
not
satisfactory.
Measure the
Dens;ty
Controller
distance between the
two
7/16
20
P~ug
blocks;
disconnect
spring
from
the
most
accessible
linkage pin
CPort
for
Temp.
Measurement
of
and
remove
the
pin.
Tum
the
Intercooler Out Induction
Air~
block
and
adjustment
screw
until
the
adjusting
wheel
is
centered
and
the
distance
between block
is
exactly
as
previously
ENGINE
ADJUSTMENTS
FIGURE
71-2
4-99
71-00-52
OLDWILLWAYNE