Mooney M20K - Manifold Pressure; Fuel Flow Indicating System; Temperature Indicating; TIT;CDT Instrument

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONE/
AIRCRAFT
CORPORATION
TACHOMETER
TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
No
permanent
or
intermittent
C/B
out
(IGN/CIG
LTR)
Reset
C/B.
indicator
reading.
Broken
wire
Check
3
repair
win’ng.
Faulty
instrument.
Replace
instrument.
Pointer
Oscillates
excessively.
Mag.
tim’ng
too
wide
behnreen
mags.
Retime
magnetos.
Isolation
resistors
at
mag.
switch
Replace
resistors.
increased
in
resistance
value.
77-1042
MANIFOLD
PRESSURE
CAUTION
Do not
over
boost
the
engine
during
any
Manifold
pressure
is
an
indication
of
engine
power
normal
operation.
(Do
not
exceed
40
inches
affected
pn’marily
by
throttle
setting.
The
instrument
is
calibrated
in
inches
of
mercury
(Hg)
and
indicates
the
manifold
pressure
for
25-0001
thru
25-0999)
(Do
not
exceed
36
inches
manifold
pressure
for
pressure
in the
induction
air
manifold.
The
RED
line
of
40
25-1000
thru
25-2012
(Do
not
exceed
39
Inches
I-In.
(25-0001
thru
250999),
36
inches
Hg
inches
manifold
pressure
for
253013
thru
(25-1000
thru
252012)
(-MB)*
or
39
inches
Hg.
(252013
25-TEA
thru
25TBA)
(-SB)*
can
be
exceeded
easily
due
to
turtocharger
pressure
also
being
applied
to
the
induction
The
waste
gate
bypass
on
the
turbocharger
(25-0001
system.
Manifold
pressure
varies
somewhat
with
pitch
thru
25-0999)
is
a
ground
adjustable
system,
(see
attitude
in
flight
and
therefore
small
oscillations
may
occur
Section
71-00-50)
that must
be
adjusted
properly.
in
flight,
particularly
in
turbulent
air.
252000
thru
25-2012
may
be
retrofitted
to
-SB
configuration
if
desired
by
owner.
MANIFOLD
PRESSURE
TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
Excessive error
at
e>cisting
Pointer
shifted.
Replace
instrument.
barometric
pressure.
Excessive
error
when
engine
is
Line
leaking.
Tighten
line
connection.
running.
Sluggish
orjerky
pointer
movement.
Improper
damping
adjustment.
Adjust
damping
screw.
Broken
or
loose
cover
glass.
Vibration
or
excessive
pressure.
Replace
glass
and
reseat
case.
Dulordiscdored
h~inous
Age.
Replace
instrument.
markings.
Incorrect
reading.
Moisture
or
oil in
line.
Disconnect
lines
and
purge
with
air.
77-10-03
FUEL
FLOW
INDICATING
SYSTEM
The
compressor
discharge
temperature
(CDT)
instrument
depicts
the
temperature
of air
enten’ng
the
Refer
to
Section
73-30-00
for
this data.
air induction
system
to
mix
with
the
fuel
for
combustion.
This
temperature
does
not
normally
become
critical
77-20-00
-TEMPERATURE
INDICATING
except
at
high
altitudes
and
high
power
settings
(250001
thru
25-0999).
Aircraft
using
a
combination
TIT/CDT
gauge
utilize
a
non-grounding
TIT
probe.
An
77-20-01
-TIT/CDT
INSTRUMENT
ohmmeter
connected
between
either
lead
and
the
The
turbine
inlet
temperature
CTIT)
instrument
depicts
probe
case
should
indicate
high
resistance.
If
zero
or
the
temperature
of
the
exhaust
gases
as
they
enter
the
low
resistance
is
indicated
the
probe
has
shorted
and
turbocharger.
This
temperature
is
controlled
by
power
ShOUld
be
replaced.
setting,
RPM
and
the
fuel
air
ratio
entering
the
NOTE
combustion
chamber
of the
engine
cylinders.
The
TIT
S/N
25-1000
thru
25-TEA
do
not
use
a
CDT
gauge.
should
never
exceed
16500
F.
continuous
operation.
77-10-02
OLDWILLWAYNE