MIL-PRF-62140B
c. Rated operating conditions. The engine rating shall be corrected to the
following conditions in accordance with MIL-STD-1400:
Dry air barometric pressure
29 inches (in.) of mercury ( Hg)
85°F
Inlet air temperature
Vapor pressure
0.38 in. of Hg
0.0705 pound per cubic foot (lb/ft3)
Dry air density
3.4.1 Endurance. Unless otherwise specified (see 6.2) , the engine shall retain 90 percent
(%) of its rated horsepower (hp) after being subjected to a 400-hour endurance test without
requiring any more maintenance than changing oil, replacing oil and fuel filters, and minor
adjustments (see 4.6.4).
3.4.1.1 Endurance run fuel. During the endurance run, the engine shall be operated with
referee-grade diesel fuel conforming to MIL-F-46162.
3.4.1.2 Endurance run lubricating oil. During the endurance run, the engine shall be
operated with reference grade lubricating oil conforming to MIL-L-2104 (see 6.3.3).
3.4.2 Speed range. The engine shall operate satisfactorily under all loads and conditions
as specified herein through a speed range of 1200 to 2785 revolutions per minute (rpm). The
engine shall maintain an idle speed of 650 to 700 rpm when using diesel fuel conforming to grade
2 of A-A-52557 (see 4.6.4).
3.4.2.1 Governor. The governor shall limit the engine speed as follows:
Full-load operation
2785 to 2835 rpm
No-load operation
2940 to 2990 rpm
The engine speed with no load on the engine shall stabilize within 3 seconds (s) after full-rack
position is reached (see 4.6.2 and 4.6.4).
3.4.3 Brake horsepower (bhp). At the completion of the production break-in run, the
engine operating at 2785 rpm and corrected to MIL-STD-1400 operating conditions, shall
develop not less than 202 gross bhp (see 4.6.4 and 6.3.2).
3.4.4 Torque. The engine operating at 1600 rpm shall develop not less than
420 pound-feet (lb-ft) observed torque using specified fuel at the completion of the production
break-in run (see 4.6.4).
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