Mooney M20R - Cylinder Head Temperature; Exhaust Gas Temperature (EGT) Instrument; Manifold Pressure Troubleshooting; Tachometer Troubleshooting

SERVICE
AND
MAINTENANCE
MANUAL
MZOR
MOONEY
AIRCRAFT
CORPORATION
TACHONIETFFR
TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
No
permanent
or
intermittent
C/B
out
(IC~N/CIG
LTR)
Reset
C/B.
indicator
reading.
Broken
wirie
Check
repair
wiring.
Faulty
instrument.
Replace
instrument.
Pointer
Oscillates
excessively.
Connectorj
pins/receptacles
not
Clean
connector
pins/receptacles
makingsobd
contad,
w/non-condudive
cleaner.
Mag.
timin~
too
wide between
Retime
magnetos.
mags.
Isolation
rt)sistors
at
mag.
Replace
resistors.
switch
inc~ased
in
resistance
value.
77-10-02
MANIFOLD
PRESSURE
Manifold
pressure
is
an
indication
of
engine
power/
affected
primarily
by
throttle
setting.
The
instrument
is
call
brated
in
inches
of
mercury
(Hg)
and
inaicati?s
pre~sure
in
induction
air
manifold.
Manifold
pressure
varies
some-
what
with
pitch
attitude
in
flight
and therefore
smalt
oscillations
may
occur
in
flight,
particularly
in
turbulent
air.
MANIFOLD
PREQSURE
TROUBLE
SHOOTING.
TROUBLE
PROE/ABLE
CAUSE
REMEDY
Excessive error
at
existing
Pointer
shqfted.
Replace
instrument.
barometric
pressure.
Excessive error
when
engine
is
Line
leakirlg.
Tighten
line
connection.
running.
Sluggish
or
jerky
pointer
movement.
Improper
damping
adjustment.
Adjust
damping
screw.
Broken
or
loose
cover
glass.
Vibration
dr
excessive
pressure.
Replace
glass
and
reseal
case.
Dull
or
discolored
luminous
Age.
Replace
instrument.
markings.
Incorrect
reading.
Moisture
pr
oil in line.
Disconnect
lines
and
purge
with air.
7710-03
FUEL
FLOW
INDICATING
SYST~M
7740-011--
CYLINDER
HEAD
TEMPERATURE
Refer to
SECTION
73-30-00
for
this data.
The
cylinder
head
temperature
(CHT)
instrument
pro-
vides
operator
with
an
indication
of
how
hot
or
cool
cylin-
ders
are
operating
during
flight.
A
resistance
type
tem-
77-2000
TEMPERATURE
INDICATING
perature
probe
is
installed
in
the
hottest
running
cylinder,
currently
#2. An
optional
system
provides
a
probe
in
each
cylinder
to
provide
monitoring
of
each
cylinder’s
77-2001
EXHAUST
GAS
TEMPERATURE
j
temperature.
(EGT)
INSTRUMENT
77-2003
OIL
TEMPERATURE
A
thermocouple,
attached
to
an
exhaust
stack,
or
a~l
ex-
Refer
to
SECTION
793902.
haust
stacks
optional,
sends
an
electrical
signal
to
JECT
-PRESSURE
INDICATING
instrument.
As
exhaust
gas
temperature
rises,
the
~her-
1730-00
mocouple
sends
an
electrical
current
through
field
jcoils
77~30Q1
OIL
PRESSURE
of
instrument,
moving
pointer
to
indicate
tempen/lture
rise.
Refer
to
SECTION
7830-01.
77-1
0-02
REV.
10-98
Island Enterprises