Covering the politics, Business and technology of defense - Subscribe Today

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

Page 14 of 26

MIL-DTL-62177E 14 4.6.2.1.7 Exhaust smoke density. To determine conformance to 3.3.10, the engine shall be operated at 1800, 2000, 2200, and 2400 rpm at the full power setting. The exhaust smoke density shall be measured not more than 3 ft from the turbocharger exhaust outlet flange and recorded. 4.6.2.1.8 Blow-by flow. To determine conformance to 3.3.11, the engine shall run at 2400 rpm at the full power setting with a blow-by flow meter or equivalent. 4.6.2.1.9 Manifold flame heater (if applicable). To determine conformance to 3.3.12, the engine shall be cranked and the manifold flame heater shall be checked if it has been energized. The results shall be recorded. 4.6.2.1.10 Air pressure. To determine conformance to 3.3.13, all engine openings shall be closed to ambient with appropriate plugs and covers. A port shall be provided for applying air pressure into the engine crankcase with a gage and a shut-off valve. An air pressure of 3 psi shall be applied for 3 minutes. Any pressure drop shall be measured. Also, an air pressure of 5 psi shall be applied, and checked for any indication of faulty seals or joints. 4.6.2.1.11 Water submergence. To determine conformance to 3.3.14, the engine shall be operated for 30 minutes while submerged in water (fresh water or 4% by volume salt water) to a depth of 60 in. above the cooling fans with the intake and exhaust ducted to the atmosphere. The engine shall then be stopped for 3 minutes and shall then be restarted for an additional 15 minutes. The basic engine (see 6.5) shall operate with field excitation only to the alternator, which shall operate at no load. The results shall be recorded. 4.6.2.1.11.1 Water contamination. To determine conformance to 3.3.14.1, the water contamination in the lubricating oil shall be measured and recorded after the engine is subjected to the test specified in 4.6.2.1.11. 4.6.2.1.12 Break-in. To determine conformance to 3.3.1, the engine shall follow the break-in schedule in table VI. 4.6.3 Interface requirements verification. 4.6.3.1 Weight. To determine conformance to 3.4.2, the engine, including the generator or alternator, shall be weighed (dry weight).