MIL-DTL-62483A(AT)
15 minutes to allow the operating parameters to stabilize. The endurance test specified herein
shall be conducted using fuel conforming to DF-2 of A-A-52557 of minimum quality.
4.2.3.3 Exhaust smoke density. Exhaust smoke conditions for diesel engines during
performance and altitude testing shall be measured by the use of a Robert Bosch model
ETD 020.00 sampling pump, and analyzed on an ETD 020.50 smoke meter analyzing instrument.
Testing shall be conducted at room temperature 65° to 80°F (18° to 27°C) and in accordance
with the manufacturer's instructions. Failure to meet the EPA requirements shall constitute
failure of the test.
4.2.3.3.1 Air pollution standards. Testing for compliance shall include any of the
following: measurement, full-scale demonstration tests, similarity to previously-approved on
previously-qualified designs on the manufacturer may propose alternative test methods. Failure to
meet the EPA requirements shall be course for failure of the test.
4.2.3.4 Submersion requirements. The engine with accessories shall be under load, and
with the intake and exhaust ducted to the atmosphere, shall be operated while submerged to a
depth of 18 in. (457 mm) above the valve cover housings in fresh and salt water. While still
submerged, engine shall be restarted after being stopped for three minutes, then operated for an
additional 15 minutes. At conclusion of operation, a maximum of one percent water
contamination by volume in the lubricating oil is permissible. Failure of the engine to operate or
leakage in excess of that allowed shall constitute failure of the test.
4.2.3.5 Grades and slopes. With the engine under load, the engine shall meet the
performance characteristics specified for not less than 30 minutes in each direction. With the oil
level at the full level and at add oil level condition in the sump, and measured while in a level
condition, the engine shall perform as specified when raised and lowered to a 60 percent
longitudinal grade, when tipped sideways to a 30 percent grade, or in any combination of
longitudinal or lateral grades. During operation as specified herein, any evidence of stalling,
overheating, or degradation of performance will be cause for rejection. During the specified test,
the engine shall be shut off and restarted a minimum of 2 times in each direction, with a minimum
of 2 minutes during shutdown. Oil pressure shall be carefully monitored during tests, and if the
pressure falls below the minimum pressure indicated for safe operation, the test shall be aborted.
Any evidence of faulty lubrication, cooling, fuel supply, leakage, or other malfunction during or
following tests shall be cause for rejection. The engine shall meet the following requirements
while under test:
a. Net horsepower: 210-225 observed hp [157-168 kW] at 2100 rpm (see figure 1).
b. Peak torque: 590-650 lb-ft [800-881 N⋅m] at 1500 rpm (see figure 1).
c. Fuel consumption: shall not exceed 0.395 lb [0.18 kg] per observed bhp hour
with engine operating at full load and speed and without fan (see figure 1).
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