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MIL-DTL-62177E AVDS-1790-2 Engine Series Specification Download

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MIL-DTL-62177E 13 4.6.2 Operating requirements verification. 4.6.2.1 Performance tests. The performance tests may be run concurrently with the break-in specified in 3.3.1. The engine performance shall be required under the following conditions: a. The engine speeds shall be governed as specified in 3.3.4. b. The engine shall function with external interface inputs as follows: Fuel supply flow rate (minimum) 1400 lb (635 kg) per hour at 2400 rpm. Fuel supply pressure (minimum) 3 psi. Combustion air restriction 20 in. (0.51 m) of water (maximum) (1.5 in. Hg) at 2400 rpm. Intake air filter Equal to the requirements of MIL-PRF-46736. Cooling airflow 24 000 ft 3 /min (672 m 3 /min) approximate. c. Diesel fuel conforming to A-A-52557, grade DF-2 shall be used. MIL-L-21260, type I (-10 to 115°F) and MIL-L-46167 (-65 to 0°F) shall be used. 4.6.2.1.1 Governor. To determine conformance to 3.3.4, a bare/basic engine (see 6.5) shall be operated at full power rpm, high idle rpm, and low idle rpm. On the AVDS1790-2DR engine only, the rpm of the auxiliary drive operation shall be checked. 4.6.2.1.2 Gross hp. To determine conformance to 3.3.5, the engine shall be operated at 400 to 2450 rpm at the full power setting. The corrected gross hp shall be calculated and recorded. 4.6.2.1.3 Torque. To determine conformance to 3.3.6, the engine shall be operated at 1800 and 2400 rpm at the full power setting. The corrected torque is a value that can be calculated from the GCBHP. 4.6.2.1.4 Fuel consumption. To determine conformance to 3.3.7, the engine shall be operated at 1800 and 2400 rpm at the full power setting under full load. The corrected fuel consumption shall be calculated and recorded. 4.6.2.1.5 Oil pressure. To determine conformance to 3.3.8, the engine shall be operated at 2400 rpm with the oil temperature at 140 to 250°F measured at the main oil gallery (oil cooler outlet). The oil pressure shall be measured and recorded. Also, when the engine is idling, the oil pressure shall be measured and recorded. 4.6.2.1.6 Intake manifold pressure. To determine conformance to 3.3.9, the engine shall be operated at 2400 rpm at the full power setting. The intake manifold pressure shall be measured and recorded.