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 TB 740-97-4
oil, type I, grade 10, 30 or 50 as applicable. Upon completion of engine preservation, the preservative oil will remain in the
crankcases. A tag will be prepared for each crankcase indicating: "THIS CRANKCASE IS FILLED TO THE OPERATING LEVEL
WITH PRESERVATIVE LUBRICATING OIL GOOD FOR OPERATION UNTIL THE FIRST REQUIRED LUBRICANT CHANGE-DO
NOT DRAINCHECK OIL LEVEL--IF LOW, FILL TO THE OPERATING LEVEL WITH THE OPERATING OIL (MIL-L-2104)
APPLICABLE GRADE)." The tags will be attached to the crankcase fill tubes.
(b) Compression ignition engines operating at output levels of 150 psi (bmep) and above. At the beginning of the engine
preservation, the engine crankcase and the crankcases of any mounted accessories having a separate crankcase from the engine,
will be filled to the operating level with P-10 preservative lubricating oil, type II, grade 10 or 30 as applicable. Upon completion of
engine preservation, the preservative oil will remain in the crankcases. A tag will be prepared for each crankcase indicating: "THIS
CRANKCASE IS FILLED TO THE OPERATING LEVEL WITH PRESERVATIVE LUBRICATING OIL GOOD FOR OPERATION
UNTIL THE FIRST REQUIRED LUBRICANT CHANGE-DO NOT DRAINCHECK OIL LEVELIF LOW FILL TO THE OPERATING
LEVEL WITH THE OPERATING OIL (MIL-L-2104) APPLICABLE GRADE." The tag will be attached to the crankcase fill tubes.
(2) Dry sump.
(a) Crankcases of air cooled engines that are lubricated by adding lubricating oil to the fuel, P-10 preservative lubricating oil,
type I, grade/, 10, 30 or 50 as applicable will be added to the fuel in the ratio specified for normal operation. The engine will be
started and operated at fast idle until running smoothly. The engine will then be accelerated to 3/4 speed, without load, to assure
coverage of all interior surfaces of the lubricating system.
(b) Air cooled dry sump engines which operate with no oil in the crankcase, the inspection plate, air box cover, or the plugs
will be removed from the bottom of the crankcase and the entire interior of the crankcase will be sprayed with P-10 preservative
lubricating oil, type I, grade 30, while rotating the engine crankshaft for at least three complete revolutions.
c. Cooling Systems. Cooling systems including all tanks, pumps, pipes, water jackets, keel coolers and heat exchangers will
be drained. Thoroughly examine the system for faulty gaskets, rubber hoses, leaks, rust, dirt, loose connections and evidence of oil
seepage into the system. Systems will be cleaned and preserved as follows:
(1) Fresh water systems. Fresh water cooling systems will be cleaned using cleaning compound conforming to MIL-C-10597.
Cleaned systems will be blown dry with dry compressed air. Filler caps and drain plugs will be left open to provide ventilation.
Removed caps and plugs will be bagged, identified and secured on or near the point of installation.
(2) Raw water systems. Raw water systems will be flushed with fresh water and blown dry with dry compressed air.
Circulation of air through the system will be provided by removal of filler caps, drain plugs and open valves. Extensive disassembly
of piping will not be accomplished to provide ventilation.
d. Fuel Systems.
(1) Spark-ignition gasoline engines.
(a) Engines with carburetors. 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 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 and multifuel engines (2 and 4 cycle).
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