Mooney M20R - Engine Set-Up and Adjustment Points Diagram; Idle Fuel Pressure; Idle Mixture; Idle Speed

MOONEY
AIRCRAFT
CORPORATION
MZOR
SERVICE
AND
2.
IDLE
FUEL
PRESSURE
1
Check
and
adjust
idle
fuel
pres-
5
sure
as
follows:
A.
Back
off
idle
speed
ad-
justing
screw
two
turns
(Fig.
71-1,
item
3).
B. Start
engine
and
warm
up
at
1 500
to
1800
RPM
until
oil
pressure
Is
in
GREEN
ARC,
CHT
is
in
lowr
one-quarter
of
GREEN
ARC
and
oil
tempera-
ture
is
160
-1800
F.
C.
While
maintaining
650
RPM,
using
cockpit
throttle con-
trol,
set
idle
fuel
pressure
at
9
PSI
by
adjusting
low
unmetered
pressure
adjustment
screw
(Fig.
ii-i,
item
I)
located on
engine
pump
centerline.
Mixture
control
must
be
full
rich
and
test
gauge
(installed
in
step
1 B
above)held
at
approximately
same
level
as
engine
driven
fuel
pump.
(Clock-
wise
adjustment
of
screw
in-
creases
pressure).
NOTE
Lightly
tap
fuel
pump
after
each
adjusfmerit.
3.
IDLE
MIXTURE
Check
and
adjust
idle
mixture
as
follows:
I I I y it 1 I
3
2
CAUTION
6
Do
not
adjust
idle
mixture
4
without
first
determingthat
idle
pump
pressure
Is
corre
ct.
FIGURE
71-1
ENGINE
SET-UP
AND
ADJUSTMENT
POINTS
A.
Operate
engine
at
1500
to
1800
RPM
until
CHT
is
in
lower
one-quarter
of
GREEN
LEGEND
FOR
FIGURE
71-1
ARC
and
oil
temperature
is
160
to
180"
F.
i.
UNMETERED
FUEL
PRESSURE
B.
Reduce
engine
speed
and
stabilize
it at
2.
FUEL
MANIFOLD
VALVE,
TEST
FITTING
650
RPM
using
cockpit
throttle
control.
3.
IDLE
SPEED
ADJUSTMENT
SCREW
(below
full
open
stop
adjustment)
4.
IDLE
MIXTURE,
(CW
LEAN)
C.
Slowly,
but
postively,
move
mixture
con-
5´•
FULL
POWER
FUEL
FLOW
ADJUSTMENT,
(CW
INCREASE)
trol
from
full
rich
to
idle cut
off.
Engine
speed
shall
6´•
UNMETERED
FUEL
CAP.
increase
50
+/-25
RPM
before
beginning
to
drop
4.
LOW
BOOST
PUMP
PRESSURE
ADJUSTMENT
toward
zero.
D.
If
e?gine
speed
increase
is
less than
25
RPM,
Adjust
low
boost
pump
voltage regulator
as
follows:
adjust
idle
mixture
to
enrichen.
If
engine
speed
increase
A.
Engine
OFF.
is
more
than
75
RPM,
adjust
idle
mixture
screw
to
leaner
B.
Pressure
gauge
installed
for
unmetered
fuel
mixture.
Mixture
adjustment
screw
(Fig.
71-1,
item
4),
pressure.
turn
clockwise
to
lean).
C.
Mixture
full
rich
position.
Recheck
idle
mixture
to
insure
it is
within
specified
D.
Throttle
full
power
position.
limits.
Recheck
idle
pressure.
E.
Master
Switch
and
Low
boost
switch
ON.
NOTE
F.
Adjust
boost
pump
voltage
regulator
to
establish
Lightly
tap
fuel
metering
valve
after
each
6
PSI
unmetered
fuel
pressure.
(Clockwise
to increase
adjustment,
pressure).
Low
boost
pump
regulator
is
located
adjacent
NOTE
to
voltage
regulator
on
passenger
side
of
console,
under
Any
readjustment
to
idle
pressure
or
mixture
may
instrument
panel.
Adjustment
hole
is
accessible
from
cause
change
to
other
readings.
Recheck
all
outboard
side
of
box.
specified
readings.
REV.
10-98
71-00-51
Island Enterprises