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SECTION
7
AIRPLANE & SYSTEMS DESCRIPTIONS
CESSNA
MODEL
172N
mounted
on
the bottom
of
the
engine. The
carburetor is
equipped
with
an
enclosed accelerator pump,
an idle cut-off
mechanism, and a manual
mixture control. Fuel is delivered to
the
carburetor by
gravity flow from
the
fuel
system.
In the carburetor, fuel is
atomized,
proportionally mixed
with
intake air,
and
delivered to the cylinders through intake manifold
tubes. The
proportion of
atomized fuel
to air may
be
controlled,
within
limits,
by the
mixture control
on
the instrument
panel.
For
easy starting
in
cold weather, the engine
is
equipped
with
a
manual primer. The primer
is actually
a small pump
which
draws fuel
from
the
fuel strainer
when
the
plunger
is
pulled
out,
and
injects it into
the
cylinder intake ports
when the
plunger is
pushed back
in.
The
plunger is
equipped
with
a
lock
and,
after
being pushed
full
in,
must
be
rotated
either
Ieft or right until the knob cannot
be
pulled
out.
COOLING SYSTEM
Ram air for engine cooling
enters
through two intake
openings
in the
front ofthe
engine
cowling.
The
cooling
airis
directed
aroundthe cylinders
and
other
areas of
the engine by
baffling,
and
isthen
exhausted
through
an
opening
at
the
bottom aft
edge of
the cowling.
No
manual cooling
system
control is provided.
A winterization
kit
is available for
the
airplane. Details
of
this
kit
are
presented
in
Section
9,
Supplements.
PROPELLER
The airplane
is
equipped
with
a two-bladed, fixed-pitch,
one-piece
forged aluminum alloy propeller which
is
anodized
to retard corrosion.
The
propeller is
75
inches
in
diameter.
FUEL SYSTEM
The airplane may
be
equipped
with either
a
standard fuel system or
Iong
range system
(see
figure
7-6).
Both
systems
consist
of
twoventedfuel
tanks
(one
in
each
wing),
a
four-position
selector valve,
fuel
strainer,
manual primer,
and
carburetor.
Ref
er
to
figure
7-5
for
fuel quantity
data
for
both
systems.
FueI flows
by gravity from the two wing tanks to
a four-position
selector valve, labeled BOTH, RIGHT, LEFT,
and OFF.
With the selector
valve in either
the BOTH,
LEFT, or RIGHT position, fuel flows through
a
strainer
to
the
carburetor. From
the
carburetor, mixed fuel
and
airflowsto
the
cylinders through intake
manif old tubes.
The
manual primer
draws
its
7-20
1
JuIy
1979
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