Cessna 150K - Fuel System Servicing; Engine Oil Servicing

g. Service and install the induction air filter.
h. Remove dehydrator plugs and spark plugs or
plugs installed in spark plug holes and rotate pro-
peller by hand several revolutions to clear corrosion-
preventive mixture from cylinders.
i. Clean, gap, and install spark plugs. Torque
plugs to the value listed in Section 11.
j. Check fuel strainer. Remove and clean filter
screen. Check fuel tanks and fuel lines for moisture
and sediment, and drain enough fuel to eliminate.
k. Perform a thorough pre-flight inspection, then
start and warm-up engine.
I. Thoroughly clean aircraft and flight test air-
craft.
2-16. SERVICING.
2
-17. Servicing requirements are shown in figure
2-4. The following paragraphs supplement this
figure by adding details not included in the figure.
2-18. FUEL. Fuel tanks should be filled immedi-
ately after flight to lessen moisture condensation.
Tank capacities are listed in Section 1. The recom-
mended fuel grade to be used is given in figure 2-4.
2-19. FUEL DRAINS are located in the fuel tanks,
fuel line, fuel strainer, and carburetor. Drain plugs
are installed in the fuel tanks, fuel line forward of
ON-OFF valve, and carburetor. The strainer drain
valve is an integral part of the fuel strainer assembly.
The strainer drain is equipped with a control which
is located adjacent to the oil dipstick. Access to the
control is through the oil dipstick access door. Re-
move drain plugs and open strainer drain at the in-
tervals specified in figure 2-4. Also, during daily
inspection of the fuel strainer, if water is found in
the fuel strainer, there is a possibility that the wing
tank sumps or fuel line contain water. Therefore,
all fuel drain plugs should be removed and all water
drained from the system. To activate drain valve
for fuel sampling, place cup up to valve and depress
valve with rod protruding from cup. See figure 12 -3.
2-20. CARBURETOR DRAIN PLUG INSPECTION.
In order to prevent the possibility of thread sealant
contamination in the carburetor float chamber,
cleaning and inspection of the carburetor should be
accomplished at each 100-hour inspection and any-
time water in the fuel is suspected.
a, With the fuel valve OFF, remove carburetor
drain plug and clean off any sealant present on the
end of the plug or in the threads on the plug.
b, Inspect drain plug hole in the carburetor and re-
move any sealant remaining in the hole,
c. Turn fuel valve to ON to flush float chamber and
drain plug chamber while probing drain plug hole to
ascertain that all residue of sealant material is dis-
lodged and washed out of the chamber. Flushing
operation should last 15 to 30 seconds.
d, A second flushing should then be accomplished
and the drained fuel retained for inspection to insure
that no sealant particles are present.
e. Install drain plug as follows:
1. Install drain plug in carburetor 1-1/2 to 2
turns.
2. Apply sealant to drain plug threads (use
2-6 Change 3
NS-40 (RAS-4) or equivalent). I
3, Tighten and safety drain plug.
f. Turn fuel valve ON and inspect for evidence of
fuel leakage.
2 -21. ENGINE OIL. Check engine lubricating oil
with the oil dipstick five to ten minutes after the en-
gine has been stopped. Engine oil should be drained
while the engine is still hot so that more positive
draining is obtained. Refer to the inspection charts
for required intervals for oil and filter changes.
Change oil every 6 months even though less than the
specified hours have accumulated. Reduce these peri-
ods for prolonged operation in dusty areas, in cold
climate where sludging conditions exist, or where
short flights and long idle periods are encountered,
which cause sludging conditions. Always change oil
and install a new filter element or clean screens
whenever oil on dipstick appears dirty.
NOTE
On
aircraft equipped with an oil cooler,
drain oil cooler at each oil change period.
When oil cooler is drained and after the
first engine run-up, check oil with dipstick
and add oil as required to bring oil in the
sump to the desired leveL
Oil capacity is six quarts total with a normal oper-
ating capacity of five quarts for flights of less than
three hours, For extended flight, fill to the six
quart level on the dipstick, DO NOT operate with
less than the minimum for flight quantity of four
quarts. If the engine is equipped with an external
oil filter, an additional quart of oil is required when
the filter element is changed. When adding or chang-
ing engine oil, use aviation grade oil in accordance
with figure 2-4.
NOTE
New or newly-overhauled engines should be
operated on aviation grade straight mineral
oil until the first oil change. If an ashless I
dispersant oil is used in a new or newly-over-
hauled engine, high oil consumption may be
experienced. The anti-friction additives in
ashless dispersant oils will retard "break- •
in" of the piston, rings and cylinder walls.
This condition can be avoided by the use of
straight mineral oil. The aircraft is delivered
from Cessna with a Corrosion Preventive Air-
craft Engine Oil (MIL-C -6529, Type IT, RUST
BAN). If oil must be added during the first 25
hours, use only aviation grade straight mineral
oil (non-detergent) conforming to Specification
No. MIL-L-6082. After the first 25 hours of
operation, drain engine oil sump and clean both
the oil suction strainer and oil pressure screen.
If an optional oil filter is installed, change fil-
ter element at this time. Refill sump with
straight mineral oil (non-detergent) and use
until a total of 50 hours have accumulated or
oil consumption has stabilized, then change
to ashless dispersant oil, conforming with I
Continental Motors Specification MHS-24