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|  MIL-T-62531(AT)
3.4.5.3 Fuel. The engine shall be capable of full performance consuming fuel in accordance
with DF-2 of VV-F-800 (see 4.4.5.3).
3.4.5.3.1 Fuel tanks. The vehicle fuel tank(s) will be designed and constructed in
accordance with FMCSR 393.67. The fuel tank(s) will be certified in accordance with
FMCSR 393.67(f). The fuel tank/lines venting system shall not be combined or inter-connected
with other vent systems (see 4.4.5.3.1).
3.4.5.4 Engine lubrication system. The lubrication system shall operate satisfactorily under
all intended service, operating, and performance requirements specified herein when serviced
with seasonal grades of oils as specified in MIL-L-2104 from minus 23 Celsius (C) to 52C and
MIL-L-46167 from minus 54C to 18C. The oil pressure shall not fall below minimum
recommended by the engine manufacturer even with the oil level at the lowest marked safe
operation level on the oil gage. At initial truck assembly, contractor may utilize an engine oil of
his own selection for ambients of minus 23C to 49C only, provided oil selected is compatible
with oil as specified in MIL-L-2104. The vehicle throttle and engine accelerator shall comply
with MIL-STD-1180, Requirement No. 124 (see 4.4.5.4).
3.4.5.5 Oil filler and gage. The crankcase oil filler location shall allow oil to be readily
poured into the filler opening without requiring the use of a funnel, using a container conforming
to type II, 5-quart size of PPP-C-96 and type II 5-gallon of PPP-P-704. The engine shall be
provided with a properly accessible waterproofed bayonet gage (dipstick) that ensures ready and
accurate reading of crankcase oil level (see 4.4.5.5).
3.4.5.6 Steam and water jet cleaning. The engine and all its components shall withstand
cleaning with high pressure steam or water jet and cleaner, conforming to P-C-437 without
deterioration of seals and hoses. Also there shall be no water leakage past seals and gaskets.
Paint removal shall not be a basis for rejection under this requirement. Steam or water jet
cleaning shall be conducted as follows (see 4.4.5.6):
The jet is applied perpendicular to the surface being cleaned at a distance of not
more than 0.3 meters (m) from the surface for steam cleaning, and not more than
1.5 m from the surface for water jet cleaning. The jet pressure shall not be less
than 689 kilopascals (kPa) and not more than 758 kPa.
3.4.5.7 Cooling system. The cooling system shall maintain a coolant temperature from the
engine no greater than 99C, an engine oil sump temperature of no greater than 127C, and a
transmission oil temperature at converter outlet no greater than 163C under all specified
environmental performance and RAM-D requirements. The engine and cooling system as
installed in vehicle shall perform as specified using water and anti-freeze solution conforming to
MIL-A-11755 or water and corrosion inhibitor compound conforming to 0-1-00490 (see 4.4.5.7).
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