MIL-DTL-62177E

DETAIL SPECIFICATION

ENGINE, DIESEL: 12 CYLINDER, 90° V-TYPE, 750HP, AVDS1790-2, AVDS1790-2A, AVDS1790-2C, AVDS1790-2D, AVDS1790-2DR, AVDS1790-2CA AND AVDS1790-2DA

MIL-DTL-62177E

  MIL-DTL-62177E - Page 17 of 26

MIL-DTL-62177E
17
r.
At the start and end of test and at the end of every 5th cycle, a full power setting
corrected performance test curve (see figure 1 for a sample) shall be plotted from
measurements taken at a minimum of seven speed settings in descending order,
the first setting being at rated speed.
The speeds to be run shall include 1200,
1400, 1600, 1800, 2000, 2200, and 2400 rpm.
4.6.4.1.1.2
Test cycle.
The test cycle shall be as specified in table VII.
4.6.4.1.2
NATO cycle.
When specified (see 6.2), the test according to 4.6.4.1.1.2. shall
not be required, and the first article test shall be the NATO cycle specified in 4.6.4.1.2.2.
The
engine shall require only minor services (such as replacing oil or fuel filter elements) during this
test.
Adjustments or replacement of parts must have approval by the Government.
The test shall
be conducted under the following conditions:
a.
Running time less than 30 minutes shall not be counted toward the fulfillment of
endurance hours.
b.
The inlet air temperature shall be not less than 60
°
F nor more than 100
°
F.
c.
The engine shall be operated with the same cooling airflow as prevailed during
the full power setting (run number 8 of table VI).
d.
Electrical loading:
1.
Bare engine (see 6.5).
The bare engine shall have a 300 A dc generator
installed with an applicable voltage regulator.
The generator shall operate at
100
±
10 A throughout the test.
2.
Basic engine (see 6.5).
The basic engine, with the applicable voltage
regulator, shall have its generator (alternator) operated at 200
±
10 A
throughout the test.
e.
The lubricating oil and oil filter elements shall be replaced at the end of
20 completed cycles (100 hours).
f.
After the break-in and before initiation of the test, the engine shall be borescope
inspected and the condition of the cylinders recorded.


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