Cessna SKYMASTER 336 1964 Service Manual page 17

c. Remove materials used to cover openings.
d. Remove warning placards posted at throttle and
propellers.
e. Remove and clean engine oil filter, then re-
install and safety. If an external oil filter is in-
stalled, install a new filter element and safety.
f.
Check that oil sump drain plugs are installed
and safetied, then service the engines with oil.
NOTE
The corrosion-preventive oil will mix with
engine lubricating oil, so flushing the oil sys-
tems is not necessary. Draining the oil sump
is sufficient.
g. Service the induction air filters and install.
h. Remove dehydrator plugs installed in spark plug
holes and rotate propeller by hand several revolutions
to clear corrosion-preventive oil from cylinders.
i. Install all spark plugs and connect leads.
j.
Check fuel strainers. Remove and clean filter
screen if necessary. Check fuel tanks and fuel lines
for moisture condensation and sediment, and drain
enough fuel to eliminate.
k. Perform a thorough pre-flight inspection, then
start and warm up engines.
2-11. LEVELING. The top surface of the front seat
rails is the point used to level the airplane longitudi-
nally. A level placed across the front seat rails at
Sta. 114.00 is used to level the airplane laterally.
2-12. SERVICING.
2-13. Servicing requirements are shown in the
Servicing Chart (figure 2-3). The following para-
graphs supplement this figure by adding details.
2-14. FUEL TANKS should be filled to capacity im-
mediately after flight to reduce moisture condensation.
Standard tank capacity is 92.8 gallons. Airplanes
equipped with optional fuel tanks have an additional
38 gallons capacity with 19 gallons in each auxiliary
tank. The recommended fuel grade is 100/130 min-
imum, aviation gasoline.
2-15. FUEL DRAINS are located at various points
in the fuel system to provide for drainage of water
and sediment. See Section 11.
2-15A. FUEL STRAINERS. Each 100 hours, remove
strainer bowl and cartridge assembly (items 10 thru
13, figure 11-3). Wash in solvent, plugging open end
of center tube while washing. Replace cartridge as-
sembly if defective.
2-16. ENGINE OIL should be checked 5 to 10 min-
utes after engines have been stopped. Oil should be
changed while oil is still hot. Oil capacity is 10
quarts for each engine. One additional quart is re-
quired when changing oil and filter element on air-
craft equipped with an external oil filter. To mini-
mize loss of oil through the breather line, fill to 8
quarts on the dipstick for normal flights of less than
3 hours. For extended flights, fill to the full mark on
the dipstick. Do not operate with less than 7 quarts.
On airplanes equipped with an external oil filter,
change engine oil and filter element at 50-hour
intervals. Without an external oil filter, change
oil and clean engine oil screen every 25 hours.
Change oil every four months even though less than
the specified hours have accumulated. Reduce these
periods for prolonged operations in dusty areas, in
cold climates where sludging conditions exist, and
where short flights and long idle periods are en-
countered, which cause sludging conditions. Engine
oil, and external filter element, should be changed
whenever oil on dipstick appears dirty.
NOTE
Use ONLY detergent oil conforming to Conti-
nental Motors Corporation Specification
MHS-24.
Refer to figure 2-3 for recommended oil grades. To
replace the optional external oil filter element, refer
to paragraph 10-90. An optional quick-drain valve,
for use with a hose which automatically opens the
valve when slipped over it, may be installed in place
of the existing oil drain plug.
2-17. ENGINE INDUCTION AIR FILTERS keep dust
and dirt from entering the induction system. The
value of maintaining the induction air filters in a
good clean condition can never be overstressed.
More engine wear is caused through the use of a
dirty air filter than is generally believed. The fre-
quency with which the filter should be removed and
cleaned will be determined primarily by aircraft op-
erating conditions.
A good general rule, however, is
to remove and clean filters at least every 50 hours
of engine operating time and more frequently if war-
ranted by operating conditions. Some operators pre-
fer to hold a spare set of induction air filters at their
home base of operation so that a clean set of filters
are always readily available. Under extremely
dusty conditions, daily maintenance of the filters is
recommended. The permanent dry air filters can
readily be serviced by removing and slightly rapping
to remove heavy dirt accumulations, and then wash-
ing in hot or cold water. A mild detergent in the
water will assist in cleaning where the collected dirt
may contain oil or grease. Allow water to drain
from filter and dry with filtered compressed air.
ICAUTION
Do not use solvent or cleaning fluids to clean
filter.
Use only a household detergent and
water when cleaning the permanent filter.
Be sure airbox is clean, inspect filter and replace
if filtering element is damaged, then install. The
filter is a permanent filter and may be reused as
long as it is not damaged.
2-18. BATTERY. Battery servicing involves add-
ing distilled water to maintain the electrolyte level
even with the horizontal baffle plate or split ring at
the bottom of the filler holes, checking cable con-
2-5