Installation & Operation Manual
O-360 and IO-360 Series Engines
1
© March 2004 Superior Air Parts Inc. Chapter 9 • Engine Preservation & Storage
CHAPTER 9
Engine Preservation And Storage
There is no practical procedure that will ensure
corrosion prevention on installed aircraft
engines. The degree of corrosion is influenced
by geographical locations, season and usage.
The owner/operator is responsible for
recognizing the conditions that are conducive to
corrosion and for taking appropriate precautions.
Corrosion can occur in engines that are flown
only occasionally regardless of geographical
location. In coastal areas and areas of high
humidity corrosion can occur in as little as a few
days. The best method for reducing the likely
hood of corrosion is to fly the aircraft at least
once every week for a minimum of one hour.
Note:
Corrosion may reduce engine service life.
Of primary concern are cylinders, piston rings,
camshaft and lifters.
1. TEMPORARY STORAGE
A. Preparation for Storage
(1.) Remove oil sump drain plug and drain oil.
Replace drain plug, torque and safety. Remove
oil filter. Install new oil filter, torque and safety.
Service engine to proper sump capacity with
MIL-C-6529 Type II oil. This oil is not to be used
as a lubricant.
(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
THE “P” LEADS ARE GROUNDED.
(C.) THROTTLE POSITIONS “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 operation verify all spark plug leads are
removed and remove the top spark plugs.
Protect the ignition lead ends with AN-4060
Protectors. 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.) Drain preservative oil. 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 top spark plugs but do not install
spark plug leads.
(7.) Seal all engine openings exposed to the
atmosphere using suitable plugs and covers.
(8.) 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)”
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