Engine Induction Air Filter - Cessna 1969-1976 172 Series Service Manual

When adding or changing oil, use aviation grade oil in
accordance with the following chart.
MODEL
172 AND
F172 (1972
&
ON)
"BLUE STREAK" (Lycoming) ENGINE
AMBIENT
TEMPERATURE
RANGE
GRADE
I
STRAIGHT
MINERAL OIL*
ASHLESS
DISPERSANT OIL*
ABOVE 60'F
3 0 ' TO 90'F
0'
TO 70'F
BELOW IO' F
SAE 50
SAE 40
SAE 30
SAE 20
I
SAE 40 OR SAE 50
SAE 40
SAE 30 OR SAE 40
SAE 30
*AVIATION GRADE OILS CONFORMING TO AVCO LYCOMING SPECIFICATION NO. 301 AND SERVICE
INSTRUCTION NO. 1014, AND TO ANY REVISIONS OR SUPPLEMENTS THERETO, MUST BE USED.
CONTINENTAL ENGINE
MODEL AMBIENT GRADE
***
TEMPERATURE
**
I
ABOVE 40'F
I
BE LOW 40' F
F172 (THRU 1971) SAE 40
SAE 20
**
WHEN OPERATING TEMPERATURES OVERLAP INDICATED RANGES, USE THE LIGHTER GRADE
O F OIL.
**
AVIATION GRADE ASHLESS DISPERSANT OILS CONFORMING TO CONTINENTAL MOTORS
EXCEPT AS NOTED IN THIS PARAGRAPH.
ENGINE SERVICE BULLETINS FOR FUTHER RECOMMENDATIONS.
SPECIFICATION MHS-24 AND ALL REVISIONS AND SUPPLEMENTS THERETO MUST BE USED
REFER TO CURRENT CONTINENTAL AIRCRAFT
2-22. ENGINE INDUCTION AIR FILTER. The induc-
tion 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 a 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 t o remove, inspect,
and clean the filter
at least
every 50 hours of engine
operating time and more frequently if warranted by
operating conditions, Some operators prefer to hold
s p a r e induction air filters at their home base of
operation s o that a clean filter is always readily
available f o r use. Under extremely dusty conditions,
daily servicing of the filter is recommended.
Two
types
of
filters have been used. One is a flock-coated,
oiled filter and the other is
a dry, paper-media
filter.
NOTE
Early Model F172-series was equipped with
a flock-coated, oiled filter when it
left the
factory. However, new filters ordered from
the Cessna Service Parts Center will be the
dry type with an improved filtering element.
The Model 172-series is equipped with the
dry type filter.
To service the flock-coated, oiled filter, proceed
as
follows:
a. Remove filter from aircraft.
b. Wash filter thoroughly, soiled face down in
solvent (Federal Specification P-S-661 o r equiv-
alent).
s c r e e n filter in the s a m e grade of oil used in the
engine and allow excess oil t o drain off.
c. Drain and d r y filter, then dip flock-coated
2-8 Change 3