Before cleaning any engine the applicable engine technical
manual must be consulted for the proper procedures to follow. On
some engines, temperature and pressure lines must be disconnected and
capped to prevent solvent and water from entering.
The following is the preferred method for cleaning the
compressor on the T53L13. Refer to figure 3.7 as you read the
following steps in the cleaning method.
a.
Remove airframe air intake components as necessary.
b. Remove the inlet airtemperature sensing element from the
inlet housing.
c. Disconnect the pressure line to bleed band actuator and
cap the diffuser fitting with AN9296 cap assembly.
d. Block off the customer bleed air supply at the customer
airbleed port in the airbleed adapter assembly.
e. While the engine is cold, rotate it with the starter and
spray one quart of drycleaning solvent (PD680 Type 1) evenly
through all sections of the inlet housing. Make sure both sides of
the inlet guide vanes are covered with solvent.
f. Stop motoring the engine and let it stand for at least one
hour to permit the dry cleaning solvent to loosen dirt.
g. Clean the inlet guide vanes with a small, round fiber
brush with a long handle.
h.
Start the engine and operate it at flight idle.
i. Spray CLEAN fresh water evenly into all sections of the
inlet housing at the rate of two gallons per minute for approximately
two minutes. To avoid freezing at ambient temperatures below 35 F
(1.5 C), use antidetonating injection fluid or a mixture containing
40 percent methanol and 60 percent water in lieu of water.
j. Allow the engine to run for 2 to 5 minutes to dry out;
then shut the engine down.
k. Inspect the inlet guide vanes and compressor for
cleanliness.
l.
Repeat the cleaning procedure if necessary.
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