MIL-DTL-46796D
4.6.10.2 Speed range. To determine conformance to 3.5.2, verify that the engine
operates satisfactorily within the speed range of 1150 to 2600 rpm, under all loads and conditions
specified in 4.5.1.
4.6.10.2.1 Idle speed. To determine conformance to 3.5.2.1, verify that the range idle
speed of 550 to 600 rpm is maintained using diesel fuel conforming to grade 4-D of
ASTM D975.
4.6.10.3 Governor. To determine conformance to 3.5.3, verify that the full load engine
speed is 2275 to 2325 rpm and the no load engine speed is not less than 2450 to 2500 rpm.
When a two speed governor is installed on an engine, the governor speeds during winching
operations shall be not less than 1150 rpm for full load and not more than 1350 rpm for no load.
Verify in each no load case that the engine speed stabilizes within 3 seconds after a full rack
position is reached.
4.6.10.4 Brake horsepower. To determine conformance to 3.5.4 and 3.5.4.1, verify that
the observed brake horsepower is not less than 380 bhp (TYPE I) or 418 bhp (TYPE II) observed
at 2300 rpm when corrected to specified operating conditions, upon completion of the engine
break-in run (see 3.5.1).
4.6.10.5 Torque. To determine conformance to 3.5.5, verify that the observed torque
measured at the engine flywheel, upon completion of the break-in run, is not less than 885 lb-ft
(1200 N-m) for TYPE I or 920 lb-ft (1247 N-m) for TYPE II at 1800 rpm with a full rack setting.
4.6.10.6 Exhaust smoke density. To determine conformance to 3.5.6, verify that the
exhaust smoke density measured with a smoke meter and sampling pump or visually against a
white background, within 3 feet (ft) (0.9 m) of the turbocharger outlet, shall meet the conditions
listed in table I or table II respectively.
4.6.10.7 Fuel consumption. To determine conformance to 3.5.7, verify that the fuel
consumption does not exceed the limits specified in table III when operating at the specified full
rack setting.
4.6.10.8 Oil consumption. To determine conformance to 3.5.8, verify that the oil
consumption does not exceed 0.0012 lb (0.55 g) per observed bhp hour after 25 hours of full rack
operation at conditions as specified in 3.5.4 and 3.5.4.1.
4.6.10.8.1 Oil pressure. To determine conformance to 3.5.8.1, verify that the engine
gallery oil pressure, measured at the oil pressure sending unit, does not exceed 80 psi (551 kPa)
nor is less than 35 psi (241 kPa) when the engine is operating at 2300 rpm with an oil sump
temperature of not less than 180F (82.2C). The oil pressure when the engine is idling at 550 to
600 rpm shall be not less than 5 psi (34 kPa).
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