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MIL-T-62531(AT)
4.4.5 Engine examination. The engine with all accessories specified in 3.4.5, will be
examined for completeness, proper installation in vehicle, electrical hookups, fuel line
connections, air line connections, mechanical control hookups, oil level, and cooling fluid
hookups.
4.4.5.1 Production engine settings and requirements test. The contractor shall perform a test
analysis verifying that all requirements specified in 3.4.5.1 have been met as follows:
a.  Net horsepower.
b.  Peak torque.
c.  Fuel consumption.
d. Oil consumption.
4.4.5.2 Engine governor test. To determine conformance to 3.4.5.2, the engine shall be
started and operated without load, with foot accelerator depressed to the maximum permissible
position, the engine speed shall not exceed ______ rpm. The governor shall be examined to
assure that it is properly sealed.
4.4.5.3 Fuel test. To determine conformance to 3.4.5.3, all performance testing of vehicles
with payloads shall be accomplished consuming fuel which conforms to DF-2 of VV-F-800.
4.4.5.3.1 Fuel tanks. To determine conformance to 3.4.5.3.1, vehicle fuel tanks will be
designed and constructed in accordance with FMCSR 393.67 and certified to FMCSR 393.67(f).
The fuel tank/lines venting system shall not be combined or inter-connected with other vent
systems.
4.4.5.4 Engine lubrication system test. To determine conformance to 3.4.5.4 the contractor
shall provide a laboratory analysis verifying that the oil provided in the engine meets the
requirements of MIL-L-2104. The engine shall be operated at idling speed and the oil pressure
shall not fall below the minimum safe operating pressure. The throttle and engine accelerator
shall comply with MIL-STD-1180, Requirement No. 124.
4.4.5.5 Oil filler and gage examination. To determine conformance to 3.4.5.5, oil shall be
poured into the crankcase filler opening from specified containers. Caution, do not overfill
engine oil sump.
4.4.5.6 Steam and water jet cleaning test. To determine conformance to 3.4.5.6, the engine
shall be steam and water jet cleaned during FPVI testing and subsequent to all other tests. The
engine shall be equipped with all components listed in 3.4.5. The engine and components shall
be disassembled to the extent necessary to determine probable entry of water or deterioration to
seals, hose, gaskets, or driving belts. Any evidence of water entry or deterioration of seals, hose
gaskets, or driving belts resulting from the above testing shall be cause for rejection.
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