Mooney M20K - Propeller Controlling; Propeller Governor Control Rigging; Propeller Governor Trouble Shooting

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE
AND
MAINTENANCE
MANUAL
61-20-00
PROPELLER
CONTROLLING
7.
Operate
the
propeller
control
from
cockpit
to
verify
full
travel of
control
arm
in
both
directions,
high
61-20-10
PROPELLER
GOVERNOR
RPM
to
minimum
RPM
stop.
CONTROL
RIGGING
NOTE
When
propeller
control
n’gging
is
complete,
check
i.
Disconnect
propeller
govemor
control
rod.
controls
in
cockpit
to
be
sure
there is
1/8
inch
A.
Remove
cotter
pin,
nut,
bolt
and
washers
from
cushion
between
control knob
and
adjustment
nut
rod end at
propeller
governor
control
arm.
on
instrument
panel.
The control
should
not
B. Disconnect
control
rod
from
governor
control
bottom
out
when
pushed
full
forward,
arm.
CAUTION
2.
Adjust
control
$rm
spring
to
minimum
tension
Recheck
safety
wire,
security
and thread
which
will
return
control
arm
to
maximum
RPM.
engagement
on
all
engine
controls
after
3.
Push
propeller
control
in
cockpit
full
forward.
Pull
adjustment
rigging
or
assembly.
control
back
approximately
1/8
inch
and
lock
in
this
position.
NOTE
4.
Place
governor
control
arm
against
high
RPM
Vemier
controls
friction
can
be
adjusted by
stop
screw,
loosening
lock
nut
on
back
side of
panel
and
5.
Adjust
propeller
control
rod end
to
coincide
with
either
tighten
nut
on
front
of
panel
to
increase
the
governor
arm
position.
friction
or
loosen
the
nut
to
decrease
friction,
6.
Attach
control
rod end
to
governor
arm
and
RetigMen
lock
nut
on
back
side
to
secure
cable
to
replace
cotter
pin.
panel.
61-20-90
PROPELLER
GOVERNOR
TROUBLE
SHOOT1NG
TROUBLE
PROBABLE
CAUSE
REMEDY
Leakage:Between
control
shaft
and
Damaged
O-Ring.
Replace
with
new
O-Ring.
head.
Between
head and
body.
Damaged
head and
body
gas-
Replace
gasket.
ket.
Between
relief
valve
plug
and
body.
Damaged
relief valve
plug
gas-
Replace gasket.
ket.
Between
body
and base.
Damaged body
and base
gas-
Replace
gasket.
ket.
Between
governor
base
and
engine
Damaged
governor
mounting
Replace
gasket.
mounting
pad.
gaskef.
Loose
govemor
attaching
nuts.
Retighten
nuts.
Warped engine
mounting pad.
Consult
engine
manual.
Inability
to
attain
takeoff
RPM
during
Wrong
high-RPM
governor
set-
Reset
govemor
extemal
high
RPM
ad-
static
ground
run:
ting.
justment
screw.
Incorrect
system
rigging.
Adjust
control
system.
Low
engine
power.
Consult
engine
manual.
Erroneous
reading
tachometer
Calibrate
or
replace
instruments.
or
manifold
pressure
gauge.
Sticky
pilot
valve.
Remove
head and clean
pilot
valve
with
crocus
cloth.
Maintain
sharp
pilot
valve
land
comers.
Check
for
straightness
of
pilot
valve;
a
bent,
replace
valve.
RPM will
not stabilize:
Sludae
in
aovemor
pilot
valve
Disassemble
and
clean.
or
re~ief val~e.
Buns
on
pilot
valve lands.
Disassemble
and clean
with
crocus
cloth.
61-20-00
OLDWILLWAYNE