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|  MIL-T-62531(AT)
APPENDIX A
Verification Rationale
Any evidence of water entry past the seals or deterioration of seals, hoses, or drive belts will
result in premature failure of the engine or its components. If such failure were to occur during
an emergency condition, the vehicle, personnel and cargo could be in grave danger.
Verification Guidance
Disassembly of the engine and components shall be conducted to the extent necessary to
assure that no water or cleaning solution has entered past any seals, and the seals shall be
examined to determine if there is any evidence of deterioration or leakage. Close examination of
hoses and driving belts shall be conducted.
Verification Lessons Learned
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 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 compound conforming
to MIL-A-11755 or water and corrosion inhibitor compound conforming to O-I-00490.
Rationale
Adequate cooling must be provided for engines and transmissions to obtain satisfactory
performance over a wide range of climatic conditions, and to preclude premature wear and
subsequent premature failure of component parts.
Guidance
A heavy duty cooling system shall be furnished. The cooling system shall maintain the top
tank coolant at a temperature recommended by the engine manufacturer but not more than 104C
when operated under the conditions outlined in all speed ranges. The radiator pressure cap shall
be integrated with the engine manufacturer's coolant system recommendation for best
commercial practice. The cooling system shall pass the engine manufacturer's cooling test in the
installed configuration in an ambient air temperature of 49C. If the radiator cooling system is
used to cool transmission systems, the cooling system shall be capable of adequately cooling
these components in addition to the engine. It shall have thermostatic controls for controlling the
flow of engine coolant through the radiator. Cooling system shall be adequate to cool the torque
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