Preparation Of Carburetor For Installation; Corrosion Prevention - Lycoming O-290 Operator's Manual

SECTION 7
INSTALLATION AND STORAGE

2. PREPARATION OF CARBURETOR FOR INSTALLATION.

Carburetors that have been prepared for storage should undergo the following procedures before being
placed in service.
Carburetor – Remove the fuel drain plug and drain preservative oil. Remove the fuel inlet strainer assembly
and clean in a hydrocarbon solvent. Reinstall the fuel drain plug and fuel inlet strainer assembly.
CORROSION PREVENTION IN EGNINES 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 inactive engines and will be effective in minimizing the corrosion condition for a period
up to thirty days.
Ground running the engine for brief periods of time is not a substitute for the following
procedures; 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 two (2) ounces of corrosion preventive oil
while cranking the engine about five (5) revolutions with the starter. The spray gun may be placed in
either of the spark plug holes.
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 I hot at the nozzle before spraying cylinders.
d. With the crankshaft stationary, again spray each cylinder through the spark plug holes with
approximately two ounces of corrosion preventive oil. Assemble spark plugs and do not turn
crankshaft after cylinders have been sprayed.
The corrosion preventive oil to be used in the foregoing procedure should conform to specification MIL-
L-6529, Type 1 heated to 200°F/220°F (93C/104°C) spray nozzle temperature. It is not necessary to flush
preservative oil from the cylinder prior to flying the aircraft. The small quantity of oil coating the cylinders
will be expelled from the engine during the first few minutes of operation.
7-2
LYCOMING OPERATOR'S MANUAL
NOTE
NOTE
O-235 AND O-290 SERIES