Mooney M20K - Page 284

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONEY AIRCRAFT
CORPORATION
F.
When
verification
that
no
leaks
are
present
the
D.
FULL
POWER
PERFORMANCE
boost
pump
should
be
turned
on
HIGH
again
to
purge
S~
25-0001 thru
25-0999
the
calibrated
gauge
hoses
of air.
(Ground
check).
Check
and
adjust
full
power
3.
PROCEDURE
FOR
ENGINE
ADJUSTMENTS.
performance
as
follows:
(Use
the
table,
Figure
71-2B
to
record all
data).
(1)Setthrottle
for 39.8
to
40.0
In.
Hg.
manifold
pressure
and
engine
at
2700
+0/-25
RPM.
Readjust
the throttle
as
NOTE
required
to
maintain
39.8
to
40.0 In.
Hg.
manifold
pressure.
The
engine
must
be
THOROUGHLY
WARMED
up
forall
tests.
(2)
Adjust
fuel
flow to
143
145 Ibs.
per
hour
CAUTION
(equivalent
to
18.6
19.1
PSI)
(NASA
Standard
Day)
with
m’udure
controls
in the
full rich
position.
Clockwise
Watch
for
rotating
propeller
during adjustment.
adjustment
of
the
screw
decreases
fuel flow
reading;
one
full
turn
will
cause
a
6.0
to
9.0 Ib.
per
hr.
change
A.
IDLE FUEL PRESSURE
ADJUSTMENT.
(use
6.0
Ibs/gaV.).
Record
the
difference in
reading
between
the
calibrated
fuel flow
gauge
andthe AVC
Check
and
adjust
idle fuel
pressure
as
follows:
gauge
for Mure
reference.
(1)
Back off the
idle
speed adjusting
screw
two
NOTE
(2)
tums
(CCW).
Fuel now
will
vary
with
temperature
changes.
(2)
Start
engine
and
warm
up
at
1500
to
1800
Temperature
Mn‘ations
from
NASA
STANDARD
RPM
until
oil
pressure
is
in
the
green
are,
cylinder
head
DAY
temperature
causes
apporoximate~y
.7
IbsJhr.
temperature
is
in the lower
one-quarter
of
the
green
fuelflowchangewitheach
1
C.variation(minus
are,
and
oil
temperature
is
1600
to
1800
F.
a
hotter,
plus
if
colder).
NOTE
(3)
Maintain 700
25 RPM and
set
the
idle fuel
The
fuel flow
gauge
used for
-GB
engine
adjusb.nent
pressure
to
6.5 .25
PSI
by
adjusting
the idle
pump
is different from
the
gauge
to
be used
for the
IB,
adjustment
screw
(see
Figure 71-1)
for -GB
8 -LB
nnB
and SE
eng’me
adjustment;
it is
mandatory
that
engines
and
Figure
71-4B
for -MB
8
-SB
engines)
use
ofthe
correct
gauge
(or
corrected
dial
face)
be
located
on
the
pump
body
centerline:
used
during
adjustment
procedures,
B.
IDLE
MIXTURE
E.
FULL
POWER
PERFORMANCE
(-MB
engine)
S/N 25-1000
thru
25-2012
Check
and
adjust
the idle
m’udure
as
follows:
(Ground
check)
Check
and
adjust
full
power
(1)
Operate
engine
at
1500
to
1800
RPM
until
performance
as
follows:
cylinder
head
temperature
is in
the lower
one-q_uarter
of
GREEN
are,
and oil
temperature
is
1600
to
180P
F.
(1) Operate
engine
until
oil
temperature
has
reached
a
needle
width
past
center
of GREEN
are
(2)
Reduce
engine speed
and stabilize
it
at
700
(approx
1800.
F.).
Slowly,
but
positively
advance
25
RPM.
throttle
control
to
full
power
stop,
ensure
2700 25
RPM,
and
note
manifold
pressure.
Adjust
manifold
(3)
Slowly,
but
positively,
move
mixture
control
pressure
adjustment
to
maintain
35.8
to
362
in.
Hg.
at
from
full rich
to
idle cut-off.
Engine speed
should
2700
RPM+I-
25.
Clockwise
adjustment
decreases
increase
50
RPM 25
RPM)
before
beginning
to
manifold
pressure;
one
full
tum
equals
approximately
drop
toward
zero.
1.0
in.
Hg.(See
Figure
714B).
(4)
If
engine
speed
increase
is
less
than 25
RPM,
(2)
Adjust
fuel flow
to
130-135
IbsJhr.(NASA
STD.
adjust
idle
m’udure
adjustment
to
enrich
the
mi>dure.
If
DAY)
with mbdure
control
in full rich
position.
Clockwise
engine
speed
increase
is
more
than 75
RPM,
adjust
adjustment
of
screw
decreases
fuel Pow
reading;
one
full
idle
ml>dure
(Figure
71-1
for -GB
8 IB
and
Figure
t,,
will
cause a
6.0
to
9.0
IbJhr.
change.
Record
71-4B
for -MB
8
SE)
to
lean mi>dure.
difference in
reading
between
calibrated
fuel flow
gauge
(5)
Recheck
as
required
to
insure idle mi~dure
is
and
aircraft
gauge
for future reference.
adjusted
within limits
specified
above.
(Recheck
idle
F.
FULL POWER
PERFORMANCE
(-SB engine)
pressure
per
paragraph
3.A.
(3)
above.
srm
25-2013 thru
25-TEA
C.
IDLE
SPEED
S/N
252001
dim 25-2012
may
be
retrofitted
to
-SB
configuration
by
compliance
with
Mooney
RetroM
Kit.
Check and
adjust
idle
speed
as
follows:
Check
and
adjust
full
~power
(Ground
check)
(1)
Operate
engine
at
1500
to
1800
RPM
until
performance
as
follows:
cylinder
head
temperature
is in
lower
oneguarter
of
~1)
Operate
engine
until oil
temperature
has
GREEN
are,
and
oil
temperature
is
1600
to
1800
F.
reacnea
a
needle
width
past
center
of
GREEN
are
(2)
Reduce
engine
speed
and stabilize
it
at
700
(approx
180".
F.). Slowly,
but
positively
advance
25 RPM.
throttle control
to
full
power
stop,
ensure
2600 25
RPM,
and
note
manifold
pressure.
Adjust
manifold
(3)
Adjust
idle
speed
adjusting
screw
until
contact
pressure
adjustment
to
maintain 38.8
to
392 in.
Hg.
at
is
made
with
throttle
arm
stop.
See
Figure
71-1
for
2600
RPM
25.
Clockwise
adjustment
decreases
-GB
8
-LB
engine
and
Figure
71-4B for
-MB
8
SE manifold
pressure;
one
full
tum
equals
approximately
engines).
1.0 in.
Hg.(See
Figure
71-4B).
71-00-50
OLDWILLWAYNE