Servicing; Fuel Drains; Engine Oil - Cessna 177 SERIES Service Manual

g. Service and install the induction air filter. 2-21. ENGINE OIL. Check engine lubricating oil
h. Remove dehydrator plugs and spark plugs or with the dipstick five to ten minutes after the engine
plugs installed in spark plug holes and rotate pro- has been stopped.
The aircraft should be in as near
peller by hand several revolutions to clear corrosion- a level position as possible when checking the engine
preventive mixture from cylinders.
oil, so that a true reading is obtained. Engine oil
i.
Clean. gap, and install spark plugs. Torque should be drained while the engine is still hot, and
plugs to the value listed in Section 11. the nose of the aircraft should be raised slightly for
j. Check fuel strainer. Remove and clean filter
more positive draining of any sludge which may have
screen. Check fuel tanks and fuel lines for moisture collected in the engine oil sump. Engine oil should
and sediment, and drain enough fuel to eliminate. be changed every six months, even though less than
k. Perform a thorough pre-flight inspection, then the specified hours have accumulated. Reduce these
start and warm-up engine. intervals for prolonged operations in dusty areas, in
1. Thoroughly clean aircraft and flight test air- cold climates where sludging conditions exist, or
craft. where short flights and long idle periods are encoun-
tered, which cause sludging conditions. Always
2-16. SERVICING. change oil, clean oil screens, and clean and/or
change external filter element whenever oil on the
2-17. Servicing requirements are shown in figure dipstick appears dirty. When adding or changing oil,
2-4.
The following paragraphs supplement this use aviation grade oil in accordance with figure 2-3.
figure by adding details not included in the figure.
NOTE
2-18. FUEL. Fuel bays should be filled immediately
after flight to lessen condensation.
Fuel bay capaci- New or newly overhauled engines should
ties are listed in Section 1. The recommended fuel be operated on aviation grade straight
grade to be used is given in figure 2-3. mineral oil until the first oil change. If
an ashless dispersant oil is used in a new
2-19. FUEL DRAINS. Drains and plugs are located
or newly-overhauled engine, high oil con-
in the fuel bays, selector valve, reservoir tank, lines sumption might possibly be experienced.
and carburetor. The strainer drain valve is an inte- The anti-friction additives in ashless dis-
gral part of the fuel strainer assembly. The strainer
persant oils will retard "break-in" of the
drain is equipped with a control which is operated piston, rings and cylinder walls. This con-
from the upper right rear engine baffle, with access dition can be avoided by the use of straight
through the oil dipstick access door. Remove drain mineral oil. The aircraft is delivered from
plugs and open strainer drain at the intervals speci-
Cessna with a Corrosion Preventive Aircraft
fied in figure 2-3 to drain water and sediment from Engine Oil (MIL-C-6529, Type II, RUST
the fuel system. BAN). If oil must be added during the first
25 hours of operation, use only aviation
2-20. CARBURETOR DRAIN PLUG INSPECTION.
grade straight mineral oil (non-detergent)
In order to prevent the possibility of thread sealant conforming to Specification No. MIL-L-
contamination in the carburetor float chamber,
6082. After the first 25 hours of opera-
cleaning and inspection of the carburetor should be
tion, drain engine oil sump and clean both
accomplished at each 100-hour inspection and any- the oil suction strainer and oil pressure
time water in the fuel is suspected.
screen. If an optional oil filter is installed,
a. With the fuel valve OFF, remove carburetor change filter element at this time.
Refill
drain plug and clean off any sealant present on the sump with a straight mineral oil (non-de-
end of the plug or in the threads on the plug.
tergent) and use until a total of 50 hours
b. Inspect drain plug hole in the carburetor and re-
have accumulated or oil consumption has
move any sealant remaining in the hole.
stabilized, then change to ashless disper-
c. Turn fuel valve to ON to flush float chamber and sant oil.
drain plug chamber while probing drain plug hole to
ascertain that all residue of sealant material is dis- When changing engine oil, remove and clean oil
lodged aND washed out of the chamber. Flushing
screens, or install a new filter element on aircraft
operation should last 15 to 30 seconds. equipped with an external oil filter. An oil quick-
d. A second flushing should be then accomplished drain valve may be installed. This valve provides
and the drained fuel retained for inspection to insure
a quick and cleaner method of draining the engine oil.
that no sealant particles are present.
This valve is installed in the oil drain port of the oil
e. Install drain plug as follows:
sump, and allows oil to be drained by attaching a
1. Install drain plug in carburetor 1-1/2 to 2 hose over the fitting end and pushing up, causing the
turns. oil to drain through the hose into a container. To
2.
Apply NS-40 (RAS-4). MIL-T-5544 (Thread
drain the engine oil, proceed as follows:
Compound. Antisieze. Graphite Petrolatum), or a. Operate engine until oil temperature is at nor-
equivalent to plug threads.
mal operating temperature.
3. Tighten and safety drain plug. b. (With Quick-Drain Valve.) Attach a hose to the
f.
Turn fuel valve ON and inspect for evidence of quick-drain valve in oil sump. Push up on quick-drain
fuel leakage. valve until it locks open, and allow oil to drain through
hose into a container.
2-6 Change 6