MIL-DTL-62220C
After atomizer spraying has been accomplished, the dipstick shall be reinstalled, the oil filler cap
closed, and all openings to the engine interior, including dipstick shroud opening and oil filler cap
shall be sealed with tape conforming to type IV of MIL-T-22085.
3.4.2.1.1.3 Preservation through main engine exhaust systems. Two ounces of
preservative oil conforming MIL-P-46002, grade 1 shall be atomizer sprayed into the exterior
exhaust openings. Seal the openings with tape conforming to type IV of MIL-T-22085. Then
seal the engine crankcase breathers with plastic plugs conforming to MIL-C-5501 or with tape
conforming to type IV of MIL-T-22085.
3.4.2.1.1.4 Auxiliary power unit. The APU engine crankcase shall contain preservative/
lubricant conforming to grade 30 of MIL-L-21260. The type and grade of preservative/lubricant
shall be marked on DA Form 2258 together with the following deprocessing instructions: THE
APU ENGINE CRANKCASE IS FILLED WITH PRESERVATIVE/LUBRICANT GOOD
UNTIL THE FIRST REQUIRED OIL CHANGE. DO NOT DRAIN. CHECK OIL LEVEL
AND IF LOW ELEVATE TO OPERATING LEVEL WITH PRESERVATIVE/LUBRICANT
(MIL-L-21260, GRADE 30). After the APU is operated to lower the boom, processing shall be
in accordance with the following sequence of steps. It is essential to provide adequate ventilation
while operating the APU engine.
3.4.2.1.1.4.1 Preservation of combustion chambers, valves and fuel system.
1. A preservative container assembly shall be prepared (see Figure 1). Position the
selector valve to OFF. Add preservative/lubricating oil conforming to grade 10 of
MIL-L-21260 to one compartment. Dye conforming to MIL-D-81298 shall also
be added when inspection is required.
2. With the fuel pump switch on the instrument panel in OFF position, uncouple the
quick disconnect on the fuel line to the fuel pump. Connect the preservative
container assembly to the fuel pump (see Figure 5).
3. Disconnect the fuel line between the fuel pump and the primary fuel filter at the
point closest to the primary fuel filter. Disconnect the fuel line between the
secondary fuel filter and the fuel injection pump at the point closest to the
secondary fuel filter. Connect the fuel line from the fuel pump to the fuel injection
pump (see Figure 5).
4. Disconnect the fuel return line at the quick disconnect coupler. Connect the
transparent plastic return line extension to the fuel return line. The opposite end of
the transparent plastic return line extension shall be inserted into a clean/dry
recovery container (see Figure 5).
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