Cessna 172K - Page 27

SER
VICING
IN
f ERV
ALS CH
ECK LIST
Carburetor
heat may
be
used
to overcome
any
occasional
engine
roughness due
to
ice.
FIRST
25
HOUR
S
When
operating
in
sub-zero
temperature,
avoid using partial
carbu-
retor
heat. Partial heat
may
increase
the
carburetor air
temperature
to
ENGINE OIL
SUMP,
OIL
COOLER
AND
OIL
FILTER
--
After
first 25
the
32°
to
70°F
range, where
icing
is critical
under
certain
atmospheric
hours
of
operation, drain engine
oil
sump and
oil cooler and
clean
both
the
conditions.
oil
suction
strainer and oil pressure
screen.
If an
optional
oil
filter is
installed,
change
filter element
at
this time.
Refill sump with
straight
Refer to
Section VI
for
cold weather equipment.
mineral oil
(non-detergent)
and use
until a
total
of
50
hours have
accumu-
lated
or
oil
consumption has
stabilized,
then
change
to
detergent
oil.
HOT WEATHER
OPERATION.
EACH 50 HOURS
Refer
to the general warm temperature
starting
information under
STARTING ENGINE in this
section.
Avoid
prolonged
engine operation
BATTERY
--
Check
and service. Check oftener
(at least
every
30
days)
on the ground.
if operating
in
hot
weather.
ENGINE OIL
SUMP,
OIL COOLER
AND
OIL FILTER
--
On airplanes not
equipped with an
optional
oil filter, drain
the
engine oil
sump
and
oil
cooler and clean
both the oil suction strainer
and oil pressure
screen.
On the airplanes
which have an optional
oil
filter,
the oil
change interval
may
be extended
to
100-hour
intervals
providing
the
oil
filter
element
is
changed at
50-hour
intervals. Change engine oil at least
every four months
even
though
less
than 50 hours have
accumulated. Reduce
intervals for
prolonged
operation in dusty
areas,
cold
climates,
or
when short flights
and
long
idle periods
result
in
sludging
conditions.
CARBURETOR AIR
FILTER
--
Clean
or replace.
Under
extremely
dusty
conditions,
daily
maintenance
of the filter is
recommended.
NOSE GEAR TORQUE
LINKS
--
Lubricate.
When
operating
under
dusty
conditions,
more
frequent lubrication
is
recommended.
EACH 100
HOURS
SPARK PLUGS
--
Clean,
test and regap.
BRAKE MASTER CYLINDERS
--
Check and fill.
SHIMMY
DAMPENER
--
Check and fill.
FUEL STRAINER
--
Disassemble and clean.
FUEL TANK
SUMP DRAINS
--
Drain water and sediment.
FUEL LINE DRAIN
PLUG
--
Drain water and sediment.
VACUUM
SYSTEM
OIL
SEPARATOR
(OPT)
--
Clean.
SUCTION
RELIEF VALVE
INLET SCREEN (OPT)
--
Clean.
4-8
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