Textron Lycoming IO-540 Series Operator's Manual page 111

TEXTRON LYCOMING OPERATOR'S MANUAL
0-540 & 10-540 SERIES SECTION 7
CORROSION
PREVENTION IN ENGINES INSTALLED
IN INACTIVE AIRCRAFT
Corrosion can occur, especially in new or overhauled engines, on cylinder
walls of engines that will be inoperative for periods as brief as two days.
Therefore, the following preservation procedure is recommended for inac-
tive engines and will be effective in minimizing the corrosion condition for
a period up to thirty days.
NOTE
Ground running the engine for brief periods of time is not a substitute for
the following procedure; in fact, the practice of ground running will tend to
aggravate rather than minimize this corrosion condition.
a. As soon as possible after the engine is stopped, move the aircraft
into the hangar, or other shelter where the preservation process is to
be performed.
b. Remove sufficient cowling to gain access to the spark plugs and remove
both spark plugs from each cylinder.
c. Spray the interior of each cylinder with approximately (2) ounces of
corrosion preventive oil while cranking the engine about five (5) revolu-
tions with the starter. The spray gun nozzle may be placed in either
of the spark plug holes.
NOTE
Spraying should be accomplished using an airless spray gun (Spraying Systems
Co., "Gunjet " Model 24A-8395 or equivalent). In the event an airless spray
gun is not available, personnel should install a moisture trap in the air line
of a conventional spray gun and be certain oil is hot at the nozzle before spray-
ing cylinders.
d. With the crankshaft stationary, again spray each cylinder through the
spark plug holes with approximately two ounces of corrosion preven-
tive oil. Assemble spark plugs and do not turn crankshaft after cylinders
have been sprayed.
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