Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-28-02
3
06.11.2013
12
20
Rev. No:
Rev. Date:
1
25.08.2014
MAINTENANCE PRACTICES
1. General
These maintenance practices provide instructions to
remove / install the fuel filter and replace the fuel filter car-
tridge.
2. Removing / Installing the Fuel Filter and replace the
Fuel Filter Cartridge
A. Remove the Fuel Filter
(1) Remove the Fuel Filter from the aircraft by
disconnecting all fuel lines and loosening the
hose clamps that hold the filter in place. Use a
wrench to hold the fittings in the fuel filter bowl
while loosening the fuel lines to avoid
inadvertently loosening the lines. Be careful to
protect all lines and openings of the housing from
contamination.
B. Replace the Fuel Filter Cartridge
(1) Unscrew the bottom lid (5) of the filter using a
27mm wrench. Remove the fuel filter cartridge
(3) from the fuel filter housing. See Figure 10.
(2) Replace the O-Ring (6) in the bottom lid (5), set
it carefully in the groove. Stretching the ring a
little helps to retain it in the groove.
See Figure 11.
(3) Insert the new fuel filter cartridge into the fuel
filter. Ensure that the open end of the lid faces up
into the housing.
CAUTION: When using Loctite 243 (blue, medium-strength), only apply a
thin film to about 3 or 4 threads, depending on thread size and
the threaded length. If any drops collect on the thread or if
Loctite fluid escapes from the threaded connection, this is an
indication that it has been used too generously and should be
avoided.
Note: If the top lid (1) of the fuel filter bowl should loosen, refit the top
lid using Loctite 243.
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