Piper Cherokee Six - Page 414

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
7A-17.
ALTERNATE
AIR
DOOR.
The
two
types
of alternate
air door
installations
are
covered
below, along
with
the serial
number
effectivity.
(Refer
to
Figure 7A-4.)
PA-32-300
with Serial
Nos.
32-40000
to 32-7540198
inclusive:
This
alternate
air door
is
located
in the
cover
of the
filter
box
to provide
a source
of air
to
the
engine
should
there
be
an air
stoppage
through
the filter
system.
The following
should
be
checked
during
inspection:
a.
Check that
the air
door seals
are
tight and
hinge is
secure.
b.
Ascertain
that
the spring
tension
of
the door
is tight
enough
to
allow the
door
to
remain
closed
at
full engine
RPM, yet
should
there
be
an air
stoppage
it will
be
drawn
open.
c.
Actuate
the
door
by pushing
in
on it with
the
fingers
to determine
that it
is not
sticking
or binding.
d. Check
the
cockpit
control
cable
for
free travel.
e.
Check
that when
the
control
knob
in the
cockpit
is full
in, the
cable is
adjusted
to
allow
approximately
.0625
to .125
inch
between
the
actuating
arm
roller
and the
door
when
fully
closed.
PA-32-300
with
Serial
Nos.
32-7640001
and up
and
PA-32R-300
with Serial
Nos.
32-7680001
and up:
This
alternate
air
door
is
located
on
the
backside
of
the air
filter
box
which
is part
of
the
lower
cowl
and
controlled
by a
lever
mounted
next
to
the
engine
control
quadrant
in the
cockpit.
The
alternate
air
source
is
taken
off
the
exhaust
stack
assembly.
The
following
should
be
checked
during
inspection:
a.
Check
that
the
air
door
seals
are
tight
and
hinge
is secure.
b.
Actuate
the
door
to
determine
that
it
is not
sticking
or
binding
and
the
control
cable
has
free
travel.
c.
Check
that
when
the air
door
is
fully
opened
and
the
cockpit
control
is
in the
open
position,
the
cable
has
6 to
8
pounds
tension
when
lever
goes
into
full
open
and
locked
position.
This
insures
positive
seal
in the
air
box.
(Cable
tension
is measured
at
the
control
lever
with
a
spring
scale.
Adjust
as
required.)
7A-18.
FUEL
INJECTOR.
7A-19.
FUEL
INJECTOR
MAINTENANCE.
a.
In
general,
little
attention
is
required
between
injector
overhauls.
However,
it is
recommended
that
the
following
items
be checked
during
periodic
inspection
of the
engine;
torque
all
nuts
to
135-150
inch-pounds.
Seat
pal
type
nuts
finger
tight,
against
plain
nuts,
and
then
tighten
an
additional
1/3
to
1/2
turn.
1.
Check
tightness
and
lock
of
all
nuts
and
screws
which
fasten
the
injector
to the
engine.
2.
Check
all
fuel
lines
for
tightness
and
evidence
of
leakage.
A
slight
fuel
stain
adjacent
to
the
air
bleed
nozzles
is
not
cause
for
concern.
3.
Check
throttle
and
mixture
control
rod
ends
and
levers
for
tightness
and
lock.
4.
Remove
and
clean
the
injector
inlet
strainer
at
the
first
25
hours
of
operation
and
each
50
hour
inspection
thereafter.
Check
the
screen
for
distortion
or openings
in
the
strainer.
Replace
for
either
of
these
conditions.
Clean
screen
assembly
in
solvent
and
dry
with
compressed
air.
Damaged
strainer
O-rings
should
be
replaced.
To
install
the
screen
assembly,
place
the
gasket
on
the
screen
assembly
and
install
the
assembly
in
the
throttle
body
and
tighten
to
35-40
inch-pounds
torque.
Revised:
7/29/77
POWER
PLANT
2G18