Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
The
EGT
system
uses a
thermocouple
in
the
in
the
engine
exhaust
(tailpipe)
to
supply
a
voltage
proportional
to
exhaust
gas
temperature.
The
EGT
indicator
responds
to
the
voltage
developed
by
the
thermocouple.
As the
mixture is leaned
(from
full
rich),
the
exhaust
gas
temperature
will
increase
to
a
maximum
value
as
the
stoichiometric
(most
chemically
efficient)
fuel-air
ratio is
achieved
and
will
decrease
if
the mixture
continues
to
be leaned.
NEW
ENGINE
BREAK-IN AND
OPERATION
The
engine
underwent
a
run
in
at
the
factory
and
is
ready
for
the
full
range
of
use.
It
is,
however,
suggested
that
cruising
be
accomplished
at
80%
power
as
much
as
practicable
until
a
total
of
50
hours
has
accumulated
or
oil
consumption
has
stabilized.
This
will
ensure
proper
seating
of
the
rings.
ENGINE
LUBRICATION
SYSTEM
The
engine
utilizes
a
full
pressure,
wet
sump-type
lubrication
system
with aviation
grade
oil
used
as
the lubricant.
The
capacity
of
the
engine
sump
(located
on
the
bottom
of
the
engine)
is
eight
quarts.
Oil
is
drawn
from
the
sump
through
an
oil
suction
strainer
screen
into
the
engine-driven
oil
pump.
From
the
pump,
oil is
routed
to
a
bypass
valve.
If
the oil is
cold,
the
bypass
valve allows
the oil
to
bypass
the oil
cooler
and
go
directly
from
the
pump
to
the
full
flow
oil
filter.
If
the oil is
hot,
the
bypass
valve
routes
the
oil
out
of
the
accessory
housing
and into
a
flexible
hose
leading
to
the
oil
cooler
on
the
right,
rear
engine
baffle.
Pressure
oil
from
the
cooler
returns
to
the
accessory
housing
where it
passes
through
the
full
flow
oil
filter.
The
filter
oil then
enters
a
pressure
relief
valve
which
regulates
engine
oil
pressure
by
allowing
excessive
oil
to
return to
the
sump
while
the
balance
of
the oil is
circulated
to
various
engine
parts
for
lubrication.
Residual oil is
returned
to
the
sump
by
gravity
flow.
An
oil
filler
cap/oil
dipstick
is located
at
the
right
rear
of
the
engine.
The
filler
cap/
dipstick
is
accessible
through
an
access
door
on
the
top
right
side
of
the
engine
cowling.
The
engine
should
not
be
operated
on
less than
five
quarts
of
oil.
For
extended
flight,
fill
to
eight
quarts
(dipstick
indication
only).
For
engine
oil
grade
and
specifications,
refer
to
Section
8
of
this
handbook.
Revision
7
7-21
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English