Piper Cherokee 140 - Engine Warm-up Guidelines

THE PIPER
CHEROKEE
SECTION
III
In cold
weather
(below
40
degrees F.)
prime
rhe
engine
with
onetothree full
strokes
of the
priming
pump.
If extremely
cold,
stårting will
be aided
by
pulling
the
propeller
through by
hand
(switch
"OFF')
four ro five
revolutions.
If rhe temper-
ature
is above
40 degrees
the
engine may be
primed
by rhree
or
four
short
quick
strokes
of
the
throttle.
After
priming,
turn
the
electric master
sv/itch on,
engage
the
starter
and
allow
the engine
to turn approximately
one full
revolution,
then
turn
the ignition
swltch to
the
"Left"
magneto
position.
When
the engine
is firing
evenly,
turn
the magneto switch
to the
"Both" position
and
advance
rhe
thrortle
ro 800 RpM,
Check
the
oil
pressure
gauge
for a
pressure
indication.
If
oil
pressure
is
not
indicated within
thirty seconds, stop
the
engine
and
determine
the
trouble.
If the engine
fails
to start
at the
first attempt,
another
attempt
should be
made
wirhout
priming.
If
this
fails,
ir
is
possible
thar
the
engine is overprimed,
Turn the
magneto
switch
off,
open
the throttle
slowly, and
rorate
the
engine
approximately
ten revolutions
with the
starrer. Reprime
the
engine
with one
half
the
amounr
used
in
the
inirial
artempt,
turn
the
magneto
switch
to
"Left,
"
and
repear
the starting
procedure.
If the
engine again
fails
to
start, refer to the
"Lycoming
OperatingHandbook,
Section VII, Engine Troubles.
"
WARM.UP
As soon
as
the
engine starts,
the
oil
pressure
should be
checked.
If no
pressure
is
indicated within
rhirry
seconds,
stop
the
engine and
determlne
the
trouble,
In cold weather
it
will take a few seconds Ionger
to get
an
oil
pressure
indication.
Warm-up
the engine
ar 800 ro I200
RPM.
Take-off
may
be
made as
soon
as
ground check
is
com-
pleted,
providing
that
the
rhrottle
may
be
opened fully wirhout
back
firing or skipping,
and
wirhout reduction
in
engine oil
pres§ure,
l5