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 TB 740-97-4
(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 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 (MILL-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/ speed, without load,
to assure coverage to 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 cooler 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 filled with a clean solution of equal parts by volume of ethylene glycol and water or arctic type
antifreeze in accordance with table 1. To determine the percent of antifreeze required, it is necessary to consider the area where the
item is being stored or shipped. The depreservation guide will be annotated to indicate the antifreeze and percentage thereof which
the cooling systems contains.
Table 2. Guide for Protecting Cooling Systems
Lowest est.
Percent of
temp in
Geographic area
Antifreeze
Water
Specification
Notes
50
50
MIL-A-46153
1
-30 .
F
60
40
MIL-A-46153
1
-30 to -55 .
F
100
0
MIL-A-11755
2
below -55 .
F
NOTE 1
Antifreeze conforming to A-A-548, type 1, may be used provided one ounce of corrosion inhibitor conforming to O-I-
490 is added for each two quarts of water used in the solution.
NOTE 2
The antifreeze compound will be used without dilution.
(2) Raw water system. Raw water cooling systems will be flushed with clean fresh water and blown dry with dry
compressed air. The system will then be flushed with preservative conforming to MIL-C-16173, grade 5, and then thoroughly drained.
NOTE
The drained grade 5 preservative may be used to preserve additional engines until it shows evidence of
contamination by visible change of color, presence of rust particles and/or other foreign contamination. The presence
of rust particles and other foreign contaminates can be detected by filtering a small amount of the drained compound
through a suitable filter paper.
d. Fuel Systems.
(1) Spark ignition gasoline engines.
(a) Engines with carburetors. A portable container with two compartments will be
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