3.4.7 Oil consumption. After 25 hours (hr) of operation, the engine shall have consumed
not more than 0.0035 lb of lubricating oil per brake horsepower-hour, when operating at full rack
throughout the power check phase with an oil sump temperature of 200 to 230°F measured at the
oil cooler outlet of the main gallery (see 184.108.40.206).
3.4.8 Oil pressure. Under all performance conditions specified herein (including a 1 quart
low sump condition), with an oil sump temperature range from 200 to 230°F, gallery oil pressure
shall not be more than 80 pounds per square inch (psi) and not less than 40 psi, when the engine is
operating at 2800 rpm. Gallery oil pressure shall not be less than 5 psi when the engine is idling
as specified in 3.4.3, with the oil sump temperature range from 180 to 230°F (see 220.127.116.11).
3.4.9 Endurance (400 hr test). The engine shall operate as specified in 18.104.22.168 for a
period of 400 hr. During the test, the engine shall require only minor repairs, such as replacement
of belts and filters. At the conclusion of this test, the engine shall conform to the performance
requirements specified in 3.4.3 to 3.4.7, with the exception that the engine shall not develop less
than 90% of its initial power output with a maximum exhaust smoke density as specified in 3.4.6
without adjustments to the engine and shall develop 95% of full rated power after an authorized
tune-up procedure. There shall be no evidence of abnormal wear such as scuffing or galling of
cylinder bores, pistons, piston rings, piston pins, bearings, bearing journals, gear teeth, cam
surfaces, valves, tappets, or other parts; burning of valves or pistons; sticking of valves or piston
rings; leakage of gaskets or seals; imminent failure of components; or other malfunction.
3.4.10 Extreme temperature starting conditions. The engine shall start within 2 minutes
under any of the following conditions or possible combination of conditions:
a. With integral cold starting aid, without external aids after being cold-soaked for a
24 hr period, without benefit of solar radiation, in an ambient temperature of
-25°F, and with the engine cranking speed not less than 120 rpm and the voltage to
the air pump at 16 volts (V) (see 22.214.171.124).
b. Without external aids, and when operated at the following temperature with
exposure to maximum solar radiation (see 126.96.36.199):
Ambient air temperature
Intake air temperature (at air cleaner inlet)
Coolant outlet temperature
Outlet sump temperature attainable
up to 275°F
3.4.11 Low-pressure conditions. At an atmosphere pressure equivalent to 8000 ft, the
observed power output of the engine shall be not less than 90% of rated power (see 188.8.131.52).
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