MIL-DTL-62220C
5. Open the valve on the preservative container assembly to allow preservative to
flow to the APU engine.
6. Start and idle the APU engine until remaining diesel fuel is flushed from the fuel
lines and the engine is using preservative as fuel. Continue idling until half pint is
collected in the recovery container. (The run time is approximately 1 minute
35 seconds.)
7. Stop APU engine and allow engine to cool to ambient temperature.
8. Disconnect the air intake hose from the air filter. Install an air restrictor over the
opening on the air filter.
9. The start, preheat and fuel shut-off switches shall be placed in the ON position.
Crank the engine for 20-seconds. Allow the starter to cool for not less than
1 minute. Repeat this procedure three times. Allow a 1 minute cooling period
after each cranking of the APU engine. (Note: the engine may fire sporadically
while being cranked with the air restrictor installed.)
10. The preservative container assembly valve shall be closed to stop flow of
preservative. Disconnect the preservative container assembly from the fuel pump.
The fuel line to the fuel pump shall be reinstalled.
3.4.2.1.1.4.2 Preservation of APU intake manifold. Remove the APU air cleaner cover
and filter element. Remove the air restrictor from the air filter. Atomizer spray one ounce of
preservative/lubricating oil conforming to grade 30 of MIL-L-21260 into the APU air intake duct.
Seal the air intake opening with plastic plugs conforming to MIL-C-5501 or with tape conforming
to type IV of MIL-T-22085. Reinstall the air filter element and air cleaner cover.
3.4.2.1.1.4.3 Preservation of APU exhaust manifold. Atomizer spray one ounce of
preservative oil conforming to grade 1 of MIL-P-46002 into the APU exhaust opening. Seal the
exhaust opening with plastic plugs conforming to MIL-C-5501 or with tape conforming to type
IV of MIL-T-22085.
3.4.2.1.1.4.4 Preservation of APU crankcase through oil filler tube. Six ounces of
preservative/lubricating oil conforming to grade 30, MIL-L-21260, shall be atomizer sprayed into
the APU crankcase through the oil filler cap opening. Use an extension of sufficient length to
permit the spray nozzle to be within the crankcase without being submerged in the crankcase oil.
Maximum air pressure for spraying shall not exceed 25 pounds per square inch (psi). After
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, type IV, MIL-T-22085. The following deprocessing instruction shall be marked on
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