Installation & Operation Manual
O-360 and IO-360 Series Engines
2
© March 2004 Superior Air Parts Inc. Chapter 9 • Engine Preservation & Storage
Note: If the engine is not returned to flyable
status on or before the 90 day expiration it must
be preserved in accordance with “Indefinite
Storage” procedures in this section.
2. INDEFINITE STORAGE
A. Preparation for Storage
(1.) Remove oil sump drain plug and drain oil.
Replace drain plug, torque and safety. Remove
oil filer. Install new oil filter, torque and safety.
Service engine to proper sump capacity with
MIL-C-6529, Type II oil.
(2.) On aircraft: Perform a ground run-up.
Perform a pre-flight inspection and correct any
discrepancies. Fly the aircraft for at least one
hour or run on ground until 180
0
F operating
temperature is reached. Don’t exceed 400
0
F
cylinder head temperature.
(3) On test cell: Perform run-up to warm engine
to operating temperature. Run at operating
temperature for a minimum of 15 minutes.
WARNING:
TO PREVENT POSSIBILITY OF
SERIOUS BODILY INJURY OR DEATH,
BEFORE MOVING THE PROPELLER DO THE
FOLLOWING:
(A.) DISCONNECT ALL SPARK PLUG
LEADS.
(B.) VERIFY MAGNETO SWITCHES ARE
CONNECTED TO MAGNETOS AND THAT
THEY ARE IN THE “OFF” POSITION AND
“P” LEADS ARE GROUNDED.
(C.) THROTTLE POSITION “CLOSED.”
(D.) MIXTURE CONTROL “IDLE-CUT OFF.”
(E.) SET BRAKES AND BLOCK AIRCRAFT
WHEELS. ENSURE THAT AIRCRAFT TIE
DOWNS ARE INSTALLED AND VERIFY
THAT THE CABIN DOOR LATCH IS OPEN.
(F.) DO NOT STAND WITHIN THE ARC OF
THE PROPELLER BLADES WHILE
TURNING THE PROPELLER.
(4.) After flight remove all spark plug leads and
remove the top spark plugs. Protect the ignition
lead ends with AN-4060 Protectors. Install
protective plugs in bottom spark plug holes.
Using a common garden sprayer or equivalent,
spay atomized preservative oil MIL-P-46002,
Grade I at room temperature through the upper
spark plug hole of each cylinder with the piston
at bottom dead center position. Rotate
crankshaft as opposite cylinders are sprayed.
Stop crankshaft with none of the pistons at top
dead center.
(5.) Re-spray each cylinder. To thoroughly
cover all surfaces of the cylinder interior move
the nozzle or spray gun from the top to the
bottom of the cylinder.
(6.) Install dehydrator plugs (MS27215-2 or
AN4062-1) in each of the upper spark plug
holes. Make sure each plug is blue in color
when installed.
(7.) Before engine has cooled install desiccant
bags in exhaust pipes. Attach a red “Remove
Before Flight” streamer to each bag of desiccant
in the exhaust pipes and seal the openings.
(8.) Seal all engine openings exposed to the
atmosphere using suitable plugs and covers.
(9.) On aircraft, tag each propeller in a
conspicuous place with the following notation on
the tag, or if new or overhauled on the propeller
flange: “Do Not Turn Propeller – Engine
Preserved – (Preservation Date)”
3. INSPECTION PROCEDURES
A. Aircraft prepared for indefinite storage
must have the cylinder dehydrator plugs
visually inspected every 15 days. The plugs
must be changed as soon as they indicate other
than a dark blue color. If the dehydrator plugs
have changed color in one-half or more of the
cylinders, all desiccant material on the engine
must be replaced.
B. The cylinder bores of all engines prepared
for indefinite storage must be re-sprayed
with corrosion preventive mixture every 90
days.
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