Mooney M20K - Page 306

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONEY
AIRCRAFT
CORPORATION
Step
10.
If
fuel
flow
or
quantity
used
totals
do
not match
actual
values
contact
the
manufacturer
for
troubleshooting
procedures.
NOTE
Reposition
the
jumpers
by
grasping
with
needle
nose
pliers
or
tweezers
and
pulling
straight
up
to
remove
them,
then
reinsert
to
select the
appropriate
K-factor
and
units.
73-31-02
FUEL
FLOW
TRANSDUCER
I
1.
The
turbine
flow
transducer,
mounted
in
the
en-
gine
fuel
line, measures
Row
of
fuel.
The
transducer
is
rated for
a
continuous
operation
to
60
gallons
per
hour.
In
addition,
the
transducer
is
accurate
down
to
0.6
gallons
per
hour.
2. The
transducer
supplies
the
Fuel Flow
Totalizer
B
with
a
pulse
signal
from
a
self
contained
opt~-
electronic
pickup.
A
neutrally
buoyant
rotor
spins
with
En~Sine
driven
the
Ilqu[d
between
V-jewel
bearings.
The
rotor
move-
fuel
pump
ment
is
sensed
when
notches
in
the
rotor
interrupt
an
infra-red
light
beam
between
alight emitting
diode
and
TURBINE
FUEL
FLOW
TRANSDUCER
FIGURE
73
4
a
photo-transistor.
3.
The
transducer
design
is
fail
safe;
complete
rotor
´•NOTE
blockage
cannot
interrupt
fuel
Row.
The
transducer
life
The
"K"
factor
of
the
replacement
transducer
expectancy
is
1500
hours.
should
match the
"K"
factor
of
the
replaced
unit.
NOTE
Refer
to
"NOTE"
following
Section
73-31-02,
Transducers
are
categorized
by
the
number of
paragraph
3
for
detailed
expianation.
pulses
per
second
output
for
a
given
GPH
flow
A.
Note
the
position
of
finings
(8)
on
old
rate
("K
Factor)".
This
will
be
noted
as:
L, M, H,
or
HH
scribed
on
the
end
of
the
serial
no.
For
transducer
(3)
and
place
them
in
similar
position
on
the
accurate
readin~s,
replacement
transducers
new
transducer.
should
have
the
same
"K"
factor
as
the
units
being
B.
Connect
the
nuts of
lines
(4)
and
(5)
to
fRtings
replaced.
Specify
"K"
factor
code
when
ordering
(8),
leave
them
snug,
not
tight.
new
transducers.
C.
Connect
the
new transducer
(3)
to
bracket
(7)
4.
Fuel
Row
transducer
removal.
using
bolts,
washers
and
nuts
(6).
A.
Remove
top
and
bottom
cowling
from
aircraft.
CAUTION
See
Section
71-10-00
for
procedures.
Make
sure
the
lines
(4)
and
(5)
are
not
being
put
B.
Cut
and
remove
ty-raps
from
insulator
sleeves
into
a
bind
or
twist
when
securing
the
transducer
on
knife
disconnects
of
electrical
wires
(1)
(see
Figure
to
the
bracket.
73-4).
C.
Slide
insulation
sleeving
up
on
electrical
wire
D.
Tighten
all
fuel
lines
and
bolts
to
secure
the
harness,
transducer.
D.
Disconnect
the
knife
disconnects.
E.
Connect
the
knife
disconnects
and
slide
in-
E.
Remove
safety
wire from
firesleeve
(2)
around
Sulating
sleeving
over connections.
Secure
sleeving
turbine
transducer
(3)
and
unwrap
firesleeve
to
expose
Wah
ty-raps.
the
transducer.
F.
Leak
check
all
fuel
connections
by
pressurizing
F.
Loosen
nuts
on tubes
(4)
and
(5)
at
fittings
(8)
the
fuel
lines
with
hi-boost
pump.
Correct
any
leaks
or
prior
to
loosening
nuts
on
attaching
bolts
(6).
discrepancies.
G.
Loosen
and
remove
nuts,
washers
and
bolts
G.
Wrap
firesleeving
(2)
over transducer
(3)
and
(6)
from
transducer
and
bracket
(7).
secure
into
position
with
safety
wire.
H.
Disconnect
the
fare
nuts
from
transducer
fa-
tlngs
(8).The
transducer
should
now
be
free
for
NOTE
Installation
of the
new
transducer
may
affect
the
removal.
Note
position
of
fittings
(8)
on
old
transducer
engine
fuel
flow
adjustment.
It
is
recommended
(3).
that
the
procedures
of
Section
71-00-50
be
i.
Cap
all
lines
to
prevent
contamination.
followed
to
assure
engine
is
set
up
for
proper
5.
Fuel
flow
transducer
(replacement)
installation.
operation.
73-31-02
OLDWILLWAYNE