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 TB 740-97-4
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. The temporary fuel intake line will
be disconnected and the permanent fuel intake line reconnected. Fuel filters and sediment bowls will be drained. (The recovered fuel
oil mixture will not be used to preserve the 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 valves.
(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 100 0F, 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, electrodes, and gaskets. While cranking the engine with the starting motor, one-half of the determined amount (a above) of
P-10 preservative lubricating oil, type I, grade 30 will be atomized sprayed into each cylinder through each spark plug opening. The
nozzle will be inserted into the combustion chamber and maximum air pressure for spraying will not exceed 25 psi. Without cranking
the engine, the additional one half of the determined amount of the preservative lubricating oil specified will be atomized sprayed into
each cylinder through each spark plug opening, after which the crankshaft will not be rotated. The spark plug threads will be coated
with the preservative lubricating oil as specified. The spark plugs will be reinstalled A tag will be prepared indicating "ENGINE
PRESERVED-DO NOT CRANK UNTIL ISSUED TO THE USER" The tag will be attached near the engine start control switch.
(2) Compression-ignition engines (diesel and multifuel). After the engines have cooled to a cylinder head temperature of
1000F or less, measured at the injector nozzle flange area surfaces of each cylinder, the combustion chambers and valves of
compression-ignition engines will be preserved as follows.
(a) Four cycle spark ignition (gasoline) starting engines The intake manifolds, the exhaust manifolds, and the
rocker arm covers will be removed. The engine controls will be set for gasoline operation. The diesel or multifuel throttle will be
completely closed. The spark plug wires will be disconnected. Each intake valve will be manually depressed, and while each valve is
held open, one-fourth of the determined amount(a above) of P-10 preservative lubricating oil, type I or II, grade 10 will be atomized
sprayed into each cylinder through the intake ports. The nozzle tip will be inserted into the port. The maximum air pressure for
spraying will not exceed approximately 25 psi. Each exhaust valve will then be manually depressed; and while each valve is held
open, one-fourth of the determined amount of the same type and grade of preservative lubricating oil specified will be atomized
sprayed through each open exhaust port into each cylinder. In addition to the determined amount, 1/4 ounce of the preservative
lubricating oil specified will be atomized sprayed into each starting valve port. With the valves released, the engine crankshaft will
then be rotated until all pistons have completed a full cycle. The preservation cycle will then be repeated, after which the crankshaft
will not be rotated. The spark plugs will be removed. Care will be exercised to prevent damage to the threads, electrodes, and
gaskets The spark plug threads will be coated with the preservative lubricating oil specified herein. The spark plugs will be
reinstalled. The exhaust manifolds and intake manifolds will be reinstalled using new gaskets if the one originally used show
evidence of damage. The rocker arm assemblies, springs, guides, valve stems, push rods, and the inside of the rocker arm covers
will be sprayed with the preservative lubricating oil specified. The rocker arm covers will be blocked open in place with spacers, 1/4
to 1/2 inch to permit circulation of dry air over the rocker arm mechanism If wood or metal spacers dissimilar to the block or cover are
used, they will be insulated at point of contact with barrier material conforming to MIL-B-121, grade A. A
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