MIL-DTL-46796D
4.6.3 Environmental requirements verification. To determine conformance to 3.3, with
the engine mounted on a dynamometer, the engine shall start within 2 minutes and meet the
performance requirements of this specification under all of the following conditions or
combination of conditions.
4.6.3.1 Temperature start conditions.
4.6.3.1.1 Low temperature start without external aids. To determine conformance to
3.3.1.1, the base engine with integral winterization aids shall be cold started at -25F (-31.6C)
using diesel fuel in accordance with grade 4-D of ASTM D975. Prior to start, the engines shall
be cold-soaked in an ambient temperature of -25F (-31.6C) for a period of 24 hours. After
each start the engine must operate for a sufficient amount of time to stabilize engine operation.
4.6.3.1.2 High temperature start without aids. To determine conformance to 3.3.1.2, the
bare engine, without aids, shall be placed in a high temperature chamber maintained at a
temperature of 115F (46.1C), and operated at full load until all temperatures are stabilized
within the limits specified in 3.5.10. The engine shall then be shut down, hot soaked, and
restarted when the fuel temperature at the inlet to the inspection pump reaches its maximum
value. Fuel shall be supplied to the engine mounted fuel pump at a pressure of 5 psi (34 kPa).
The fuel pressure shall be shut off during the hot soak period. The starting time shall not exceed
2 minutes.
4.6.4 Elevation conditions. To determine conformance to 3.3.2, the engine shall be
placed in a simulated environmental condition of 8000 ft (2438 m) elevation with a pressure of
22.2 in. of Hg (75.2 kPa) measured at the air cleaner outlet and exhaust outlet at a temperature of
90F (32.2C), and its general performance characteristics observed.
4.6.5 Humidity conditions. To determine conformance to 3.3.3, verify that the engine
meets all performance requirements when subjected to relative humidity conditions as low as
5 % at a temperature of 115F (46.1C) and as high as 100 % at all temperatures from
-25 to 85F (-31.6 to 29.4C).
4.6.6 Electrical accessories and equipment. To determine conformance to 3.4.1, verify
that electrical accessories and equipment conform to the applicable engine drawings and that the
manufacturer has a certificate attesting conformance of electrical components (see 6.4).
4.6.7 Interchangeability. To determine conformance to 3.4.2, the manufacturer shall
provide a certificate attesting that all parts except assemblies requiring individual select fitting
components, may be installed in a like engine without modification.
4.6.8 Air cleaner. To determine conformance to 3.4.3, verify that the air cleaner capacity
and design for this engine conforms to MIL-PRF-62048 for dry types, or to the manufacturer s
standard specification for oil-bath types.
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