MIL-PRF-62541A
4.5.3.4 Exhaust smoke density. To determine conformance to 3.4.6, exhaust smoke
density shall be measured by a standard smoke meter. Table III may be used to visually define the
degree of exhaust smoke density in lieu of a smoke meter. Observation of exhaust smoke shall be
made against a white background within 3 ft of the turbocharger outlet.
TABLE III Exhaust smoke density.
Description of exhaust smoke Classification
Clear
1
Haze
2
Light Gray
3
Medium Gray
4
Dark Gray to Black
5
4.5.3.5 Oil consumption. To determine conformance to 3.4.7, the engine shall be
operated on the dynamometer for 25 hr at full rack.
4.5.3.6 Oil pressure. To determine conformance to 3.4.8, the engine shall be operated at
2800 rpm, with oil sump temperature range from 230 to 250°F. The engine shall be idled as
specified in 3.4.3, with an oil sump temperature range from 180 to 230°F.
4.5.3.7 Endurance. To determine conformance to 3.4.9, the following test shall be
performed. The endurance test shall be 400 hr, consisting of four periods of 100 hr each. Each
100 hr period shall be made of ten 10 hr cycles, with each cycle in accordance with table IV.
Running time less than 30 minutes shall not be counted toward fulfillment of the 400 endurance hr
unless it is specified in table IV.
TABLE IV. 10 hr cycle.
Period
% Rated speed
% Load
Duration hours
0
1
Idle
1/2
100
2
100
2
3
Governed speed
0
1/2
4
75
100
1
0
100
2
5
Idle
100
4 min. 6 min.
6
60
100
1/2
7
Idle
0
1/2
Governed speed
70
1/2
8
Max. torque speed
100
2
9
60
50
1/2
10
Total duration:
10
9
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