MIL-PRF-62541A
4.5.3.8 Extreme temperature starting conditions:
a. To determine conformance to 3.4.10.a, the engine, with integral winterization aids,
shall be cold started at -25°F on fuel specified in 3.3.5. Prior to the cold start, the
engine shall be cold soaked in an ambient temperature of -25°F for a period of
24 hr. After starting, the engine shall operate for sufficient time to stabilize engine
operation.
b. To determine conformance to 3.4.10.b, the engine shall be placed in a high-
temperature chamber maintained at a temperature of 125°F and operated at full
load until all temperatures are stabilized within the limits specified in 3.4.1. The
engine shall then be shut down, hot soaked, and restarted when the fuel
temperature at the inlet to the fuel transfer pump reaches a temperature of 170°F.
Fuel shall be supplied to the engine mounted fuel transfer pump at a pressure of
5 psi. The fuel pressure shall be shut off during the hot-soak period. The starting
time shall not exceed 2 minutes.
4.5.3.9 Low-pressure conditions. To determine conformance to 3.4.11, the engine shall
be placed in a simulated environmental condition of 8000 ft elevation, 22.2 in Hg pressure and
90°F temperature, and its general performance characteristics observed. NOTE: Pressure is
measured at turbocharger inlet and exhaust outlet.
4.5.3.10 Humidity conditions. To determine conformance to 3.4.12, the engine shall be
verified to meet all performance requirements when subjected to relative humidity conditions as
low as 5% at temperature of 115°F and as high as 100% at all temperatures from -25 to +85°F.
4.5.3.11 Steam and water jet cleaning. To determine conformance to 3.4.13, steam and
water jet cleaning shall be performed as follows. The jet shall be applied perpendicular to the
surface being cleaned at a distance of not more than 1 ft from the surface for steam cleaning and
not more than 5 ft from the surface for water jet cleaning, and it shall be cleaned at a rate of
1 square foot per minute. The jet pressure shall not be less than 100 psi, and not more than
110 psi. Prior to cleaning, the air intake opening, flywheel, exhaust, and all other openings that
might be affected shall be covered.
4.5.3.11.1 Post-cleaning test. The engine shall start and operate at idle speed without
misfiring within 2 minutes immediately after the completion of both the steam and water jet
cleaning operations.
4.5.3.12 Engine interchangeability. To determine conformance to 3.4.14, the M730A2
and M113A3 vehicles shall be operated satisfactory with the engine installed.
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