MIL-DTL-46796D
4.6.10.9 Coolant. To determine conformance to 3.5.9, verify that the engine meets all
performance and operating temperature (see 3.5.10) requirements when using coolants and
additives that conform to A-A-52624 and MIL-A-53009.
4.6.10.10 Limiting operating temperatures. To determine conformance to 3.5.10,
measure engine oil sump temperature at the drain plug and the coolant temperature at the drain
plug and the coolant temperature at the coolant outlet to verify limiting operating temperatures
are not exceeded when operating at full load throughout the speed range of the engine.
4.6.10.11 Air box pressure. To determine conformance to 3.5.11, verify that the
turbocharger and blower (combined) intake manifold pressure is not less than 50 inches of
mercury (Hg) (169.3 kPa) gage when operating at full load and 2300 rpm.
4.6.10.12 Endurance. Verify that the engine has passed the AEP-5, NATO standard
400 hour endurance laboratory test as specified in 3.5.12.
4.6.10.13 Heat rejection. To determine conformance to 3.5.13 for the TYPE II, verify
that the engine heat rejection is in the specified range by measuring coolant temperatures, mass
flow, and related heat flow data into and out of the engine to calculate and verify that the engine
heat rejection is as specified when operated at full rack setting, 418 gross brake horsepower,
minimum, at 2300 rpm, and with fuel in accordance with grade 4-D of ASTM D975.
4.6.11 Grades and slopes. To determine conformance to 3.6, the engine shall start and
operate on the longitudinal grades or lateral slopes up to 60 % in all directions for not less than
30 minutes. Verify that there is no evidence of inadequate lubrication, cooling, fuel supply,
leakage or other malfunction.
4.6.12 Submersion. To determine conformance to 3.7, the engine shall be submerged in
a tank or container of either fresh or salt water and operated for a period of 30 minutes. The air
intake and exhaust systems shall be ducted to the atmosphere with an applicable crankcase
fording kit. After 30 minutes of operation, and while still submerged, the engine shall be
stopped for a 3 minute period and then restarted and operated for an additional 15 minutes.
There shall be not more than one percent water contamination by volume evident in the
lubricating oil at the conclusion of the test.
4.6.13 Steam and water jet cleaning. To determine conformance to 3.8, the engine
assembly shall be steam and water jet cleaned as follows: The jet is applied perpendicular to the
surface being cleaned at a distance not more than 1 ft (0.3 m) from the surface for steam
cleaning, and not more than 5 ft (0.15 m) from the surface for water jet cleaning, and cleaned at a
rate of 1 square foot per minute (ft2/min) (0.00155 m2/s). The jet pressure shall be not less than
100 psi (690 kPa) and not more than 110 psi (758 kPa). Subsequent to the cleaning operation,
the engine and components shall be disassembled to the extent necessary to determine if any
deterioration to seals, hose, gaskets, or driving belts exists, and to determine if any entry of water
has occurred into the engine or any component. Any evidence of seals, hose gasket, or driving
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