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 TB 740-97-4
positioned to provide gravity feed to the engine. One compartment will contain gasoline and the other compartment will contain type
P-9 preservative oil. The engines fuel supply line will be disconnected at the most convenient point. A flexible line from the portable
container will be connected to the fuel supply line leading to the engine. The container selector valve will be turned to the gasoline
position. The engine will be started and operated at fast idle until running smoothly, then accelerated to 3/4 speed without load. At
the same time the fuel supply selector valve will be switched to the preservative oil position. The instant the oil reaches the
combustion chambers (evidenced by loss of speed, misfiring, and excessive smoking) the ignition will be turned off. After the engine
has stopped, the line from the portable container will be disconnected from the engine fuel supply line. The engine fuel supply line
will be reconnected. Fuel filters and sediment bowls will be drained.
(b) Engines with fuel injectors. The injector fuel return coupling will be disconnected. A line will be connected to the injector
fuel return coupling on the engine to permit draining into a recovery container. The fuel system will then be preserved as specified in
(a) above. (The recovered fuel and oil mixture will not be used to preserve other fuel systems).
(2) Compression-ignition engines (diesel and multifuel).
(a) Gasoline starting engines. A portable container with two compartments will be positioned to provide gravity feed to the
engine. One compartment will contain gasoline and the other compartment will contain type P-9 preservative oil. The flexible line
from the portable container will be connected to the engine fuel pump intake line. The engine fuel return line will be disconnected at
the quick disconnect coupling. A transparent plastic line will be connected to the disconnected engine fuel return line, and the other
end will be inserted into a recovery container to collect the returned fuel. Another portable container will be provided and will contain
type P-9 preservative oil. The diesel or multifuel engine fuel supply line will be disconnected at the most convenient point nearest the
fuel pump. The line from the portable container will be connected to the fuel-to-engine line at the point of disconnect. Controls will be
positioned for gasoline operation. The three-way valve of the two compartment container will be turned to the gasoline "ON" position.
The engine will be started and operated until running smoothly. The engine speed will then be increased to 3/4 speed and the
container selector valve turned to the preservative oil "ON" position. Engine will be operated until it begins to misfire, and the engine
controls will immediately be switched to diesel or multifuel operation. The engine will be operated at 1/2 speed until undiluted
preservative oil is flowing into the recovery container. The engine will then be increased to 3/4 speed for approximately 15 seconds
and the engine then turned to "OFF" position and the lines disconnected from the engine fuel intake lines. The engine fuel intake lines
will be reconnected. The temporary fuel return line will be disconnected and the permanent fuel return line reconnected. Fuel filters
and sediment bowls will be drained. (The recovered fuel oil mixture will not be used to preserve other fuel systems.)
(b) Straight diesel and multifuel engines. The engine fuel intake line will be disconnected at the most convenient accessible
point nearest the fuel supply tank. A line from a portable container containing fuel conforming to VV-F-800 will be connected to the
fuel intake line leading to the engine. The injector fuel return line will be disconnected at the disconnect coupling. A transparent line
will be connected to the injector fuel return coupling to allow for draining into a recovery container. The fuel valve of the portable
container will be turned to the "ON" position. The engine will be started and operated at fast idle until thoroughly warm. The engine
will then be accelerated to 3/4 speed, at which time the fuel supply will be switched to the portable container containing type P-9
preservative oil. The engine will be operated at this speed until undiluted preservative oil is flowing into the recovery container. The
engine will then be stopped. The temporary fuel return line will be disconnected and the permanent fuel return line reconnected. Fuel
filters and sediment bowls will be drained. (The recovered fuel oil mixture will not be used to preserve other fuel systems).
(c) Gasoline starting auxiliary (pony) engines . After the attached diesel or multifuel engine has been preserved, the gasoline
engines will be disengaged from the diesel or multifuel engine. The gasoline engine fuel system, combustion chambers, and valves
will then be preserved as specified for spark-ignition engines.
e. Combustion Chambers and Values
(1) Spark ignition engines. After completion of the fuel system preservation, the engine will be allowed to cool to a cylinder
head temperature of maximum 100F., measured at the spark plug area of all cylinders. Cooling may be accelerated by induced air
currents. After the engine has cooled, the spark plugs will be removed. Care will be exercised to avoid damage to the threads,
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