Cessna 177 SERIES Service Manual

11-86. DUSTY CONDITIONS. Dust induced into the
CAUTION
intake system
of the engine
is probably
the greatest
--------
ONsingle
cause
of early engine wear.
When operating
Due to the desludging
effect of the diluted under
high dust conditions, service the induction
air
oil,
engine operation should be observed
filter daily as outlined in Section 2.
Also, change
closely
during the initial warm-up
of the
engine oil and lubricate
the airframe more
often than
engine. Engines that have considerable specified.
amount of operational hours accumulated
since their
last dilution period may
be
11-87. SEACOAST AND
HUMID AREAS.
In salt
seriously affected
by the dilution process. water
areas, special care should be taken to
keep
This will be caused by
the diluted oil dis- the engine
and accessories clean to prevent oxida-
lodging
sludge and carbon deposits
within
tion. In humid areas,
fuel and oil should
be checked
the engine. This residue will collect
in frequently and drained of
condensed moisture.
the oil sump and possible clog the screened
inlet to the oil pump.
Small deposits may
11-88. GROUND
SERVICE RECEPTACLE.
With the
actually
enter the oil pump and be trapped
ground service receptacle installed, the
use of an ex-
by the main oil filter screen. Partial
or ternal power source is
recommended for cold weather
complete loss of engine
lubrication may starting and
lengthy maintenance of the aircraft elec-
result from either condition. If
these con- trical system with the
exception of electronic equip-
ditions are anticipated after oil dilution, ment.
the engine should be run for several min-
utes
at normal operating temperatures and
CAUTION
then stopped and inspected for evidence of
sludge and carbon deposits in the oil sump Before applying external power to the ground
and oil filter
screen. Future occurrence
service plug, insure AVIONICS POWER switch
of this condition can be prevented by dilu- is in the OFF position, preventing transient
ting the oil prior to each oil change. This voltages from damaging the semiconductor
will prevent the accumulation of the sludge
circuitry in the electronics
installation.
and carbon deposits.
NOTE
11-85. HOT WEATHER. Engine starting in hot
weather or with a hot engine is
sometimes hampered
Electrical power is supplied through
a split
by vapor formation
at certain points in the fuel sys-bus
bar, one side containing electronic
sys-
tem. To purge the vapor,
remove the carburetor terncircuits
and the other side having gen-
vent
plug and purge
the carburetor
and lines by turn-
eral
electrical system
circuits.
In the split
ing the fuel shut-off valve on. Purge the carburetor bus system, both sides of the bus are on at
in this
manner until fuel stands level
with the vent
her an external
plug opening. Replace
the carburetor vent
plug and
power source is connected
or the starter
operate
the engine
to make sure
that the condition
swi is tred
o the
oe contactor
has been corrected. switch is turned on; then a power contactor
w~h~~as
been
corrected
~. is automatically
activated
to
open the
circuit
to the electronic bus. Isolating the electronic
Engine
mis- starts characterized by weak intermittent
circuits in ts a r r s
h l tran-
explosions followed by puffs of black smoke from the ciruts ts manner eents ham u tan-
exhaust are caused by
over-priming or flooding. This sient
voltages from damaging the semiconduc-
situation
is more apt
to develop in hot
weather, ortors
the elect
equipment.
when
the engine is hot. If
it occurs, repeat the
start-
ing procedure with the throttle approximately one-half e r ce pl receptale crt inoro
OPEN and the mixcture control in IDLE CUT-OFF rates a polarity reversal protection. Power from
AsPeng ,move mixature control n E to fFll the external power source will flow only if the ground
As the engine fireas, move throture contti to de d service plug is correctly connected to the aircraft.
RICH and
decrease
the throttle
setting to
desired
RICH and decrease the throttle setting to desired If the plug is accidentally connected backwards, no
~~~~~idling
speed~~. ~power
will
flow
to the
aircraft
electrical
system,
thereby preventing any damage to electrical equip-
Engine mis-starts
characterized by sufficient
power thereby
preventing any damage
to electrical equip-
ment.
to
disengage the starter but
dying after three to five
men
revolutions
are
the result
of an excessively
lean
mix-
ture after the start. This can occur in either warm The battery and external power circuits have been de-
or cold temperatures. Repeat the starting procedure signed to completely eliminate the need to "jumper"
orwith additional primingtures. Repeatthestartingpracross the battery contactors to close it. A special
fused circuit in the external power system supplies
the needed
"jumper"
across
the contacts
so that with
CAUTIONI
a "dead"
battery and an external
power source
ap-
plied, turning the master switch ON will close the
Never operate
the
starting
motor more
than
12 seconds
at a time.
Allow
starter motorbattery
contactor.
to
cool between cranking
periods
to avoid
11-89
HAND CRANKING.
A normal
hand cranking
overheating.
Longer
cranking
periods
will
procedure
may be
used
to start
the engine,
if
the
shorten
the life of the
starter motor.
starter
is not engaged
with the ring
gear.
11-32starter Cha not engaged with the rng gear.
11-32
Change
7

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)