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 TB 740-97-4
discharge. No preservation required.
97. Unprotected Exposed Metal Surfaces and Linkages.
a. Precision. Coat unprotected ferrous metal precision machined surfaces and linkages with type P-6 or P-11 preservative
compound.
b. Non-precision Coat unprotected ferrous metal non-precision surfaces and linkages with type P-1 preservative.
97.1 Thru Hull Fittings/Sea Connections. Thru hull fittings/sea connections for dry stored vessels will be preserved as follows:
a Interior surfaces of thru hull fittings/sea connections shall be cleaned and free of dirt, rust, scale, and other foreign matter.
Cleaned surfaces shall be preserved with type P-2 or P-3 preservative.
b. The thru hull fittings/sea connections at the hull exterior will be masked with pressure-sensitive tape, conforming to PPP-T-
60, Type IV and coated with strippable and bituminous coating. The strippable and bituminous coating shall extend beyond the
edges of the tape. A solid wood plug or blank may be used In place of the tape at the discretion of the storing activity.
97.2 Door Hinges and Dogs. Door hinges, fasteners and dog bearings shall be thoroughly coated with type P-2 preservative and
the excess wiped away.
Section III. PRESERVATION WITH DYNAMIC DEHUMIDIFICATION WITH COCOON)
98. General. This section contains instructions for preservation with dynamic dehumidification and cocooning. This method of
dynamic dehumidification will be accomplished by constructing a cocoon and installing dehumidification equipment as outlined In
99. Engines.
a. Combustion Chambers. When preservation of combustion chambers is specified, the amount of preservative lubricating oil to
be applied to each cylinder will be 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 on 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.
(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 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 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 IF 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.
(b) Compression-ignition engines operating at output levels of 150 psi (BMEP) and above. At the beginning of 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 DRAIN CHECK OIL LEVEL IF LOW FILL TO THE OPERATING
LEVEL WITH THE
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