Cessna 150M - Engine Induction Air Filter

and revisions and supplements thereto and
with current Continental Aircraft Engine
Service Bulletins.
Ashless dispersant oil, conforming with Continental
Motors SpeCification MHS-24 and revisions and sup-
plements thereto and with current Continental Air-
craft Engine Service Bulletins, must be used at the
oil change after 50 hours of operation. When chang-
ing engine oil, remove and clean oil screens, or in-
stall a new filter element on aircraft equipped with
an external oil filter. An oil quick-drain valve may
be installed. This valve provides a quick and clean-
er method of draining the engine oil. The valve is
installed in the oil drain port of the oil sump and al-
lows the oil to be drained by inserting a hose over
the fitting end and pushing up to lock the valve open,
causing the oil to drain through the hose into a con-
tainer. To drain the engine oil, proceed as follows:
a. Operate engine until oil temperature is a
normal operating temperature.
b. (With Quick-Drain Valve.) Attach a hose to
the quick-drain valve in the oil sump. Push up
on quick-drain valve until it locks open, and
allow oil to drain through hose into container.
c. (Without Quick-Drain Valve.) Remove oil
drain plug from oil sump and allow oil to drain
into a container.
d. After engine oil has drained, close quick-
drain valve and remove hose, or install and safety
drain plug.
e. Remove and clean oil screens, or change
external oil filter element.
f. On aircraft equipped with an oil cooler, re-
move cooler drain plug and drain oil cooler at
each oil change. After oil cooler has drained,
install and safety drain plug.
g. Service engine with correct quantity and grade
of engine oil. (See figure 2-4).
NOTE
When oil cooler is drained or external
filter element is changed and after the
first engine run-up, check oil with dip-
stick and add oil as required to bring
oil in the sump to the desired level.
2-22. ENGINE INDUCTION AIR FILTER. The in-
duction air filter keeps dust and dirt from entering
the induction system. The value of maintaining the
air filter in a good clean condition can never be over-
stressed. More engine wear is caused through the
use of dirty or damaged air filter than is generally
believed. The frequency with which the filter should
be removed, inspected, and cleaned will be deter-
mined primarily by aircraft operating conditions. A
good general rule however, is to remove, inspect and
clean the filter at least every 50 hours of engine op-
erating time and more frequently if warranted by op-
erating conditions. Some operators prefer to hold a
spare induction air filter at their home base of opera-
tion so that a clean filter is always readily available
for use. Under extremely dusty conditions, daily
servicing of the filter is recommendedo Two types of
filters are used. One is a flock-coated, oiled filter
and the other is a dry, paper -media filter.
NOTE
The aircraft is equipped with the flock-coated,
oiled filter when it leaves the factory. How-
ever, new filters ordered from the Cessna
Service Parts Center will be the dry, paper-
media filter with an improved element.
To service the flock-coated, oiled filter, proceed as
follows:
a. Remove filter from aircraft.
b. Wash filter thoroughly in solvent (Federal Speci-
fication P-S-661 or equivalent). Wash with soiled
face down in solvent.
co Drain and dry filter, then dip flock-coated
screen filter in the same grade of oil used in the
engine and allow excess oil to drain from the filter.
d. Be sure air box is cleaned, inspect filteL If
filter is damaged, install a new filter.
NOTE
A damaged filter may have broken filtering
panels or the flock coating may be miSSing
from the filtering panels, which will allow
unfiltered air to enter the induction system.
Any filter that appears doubtful, shall have
a new
filter installed in its place.
e. Install filter at entrance to air box with gasket
on aft face of filter frame and with air flow arrow on
filter pointed in the correct direction.
To service the dry type filter, proceed as follows:
a. Remove filter from aircraft.
NOTE
Use care to prevent damage to filter element
when cleaning filter with compressed airo
b. Clean filter by blowing with compressed air
(not over 100 psi) from direction opposite of normal
air flow. Arrows on filter case indicate direction of
normal air flow.
ICAUTION\
Do not use solvent or cleaning fluids to wash
filter. Use only a water and household deter-
gent solution when washing the filter.
c. After cleaning as outlined in step "b", the filter
may be washed, if necessary, in a solution of warm
water and a mild household detergent. A cold water
solution may be used.
Change 3 2-7