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 TB 740-97-4
CHAPTER 4
PRESERVATION INSTRUCTIONS
Section I. PRESERVATION WITHOUT DEHUMIDIFICATION
28. General. This section outlines requirements for the preservation of vessels without the use of dehumidification equipment. The
preservation methods, techniques and contact preservatives specified for use are considered adequate to protect vessels for long
term storage. This method of preserving vessels will be used only when preservation with dehumidification is not feasible. Vessels
preserved without dehumidification require more frequent inspection, more frequent preservation and more depreservation. Vessel
components not specifically mentioned in this section will be preserved similar to those having the same operational and physical
characteristics. Due Go the unique design characteristics of self-elevating, barges and piers, detailed instructions for preservation
and storage of these vessels are provided in appendix T.
29. Engines. a. Combustion Chambers. When preservation of combustion chambers is specified, the amount of preservative
lubricating oil to be sprayed into each cylinder will be determined as follows:
(1) One-half ounce for each cylinder with piston displacement up to 25 cubic inches.
(2) One ounce for each cylinder with piston displacement between 25 and 50 cubic inches.
(3) One and one-half ounces for each cylinder with piston displacement between 50 and 75 cubic inches.
(4) Two ounces for each cylinder with piston displacement over 75 cubic inches.
CAUTION
Precautions will be taken to assure that the amount of oil injected into the combustion chambers and manifolds will
not result in hydrostatic lockup of the engine. Prior to preserving additional engines, the first engine preserved will be
allowed to stand idle for 12 hours. The engine crankshaft will then be rotated manually, or by the starting motor if
manual rotation is not possible, to assure that the amount of oil Injected into the combustion chambers and manifolds
permits free rotation of the engine.
b. Crankcases. Prior to preservation of the fuel system and combustion chambers, the engine crankcase and the crankcase
of engine accessories will be preserved as follows:
NOTE
To determine the preservation requirements for engine lubrication systems, compression-ignition and spark-ignition
are divided into two categories: Low output-engines operating at output levels up to 150 psi brake mean effective
pressure (bmep) and high output-engines operating at outputs levels of 150 psi (bmep) and above. Naturally
aspirated engines fall well below the 150 psi (bmep) range while turbocharged engines are usually 150 psi (bmep) or
higher. If bmep is unknown, the output category can be identified by visual inspection of the engine to determine if it
is turbocharged.
(1) Wet sump.
(a) Spark-ignition engines and compression-ignition engines operating at output level up to 150 psi, brake mean
effective pressure (bmep). At the beginning of engine preservation, the engine crankcase, and the crankcase 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 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
DRAIN-CHECK 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.
4-1
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