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|  MIL-E-23457B(SHIPS)
4.4.1.3 The temperature of the sea water to the engine shall be a minimum of 90F.
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4.4.1.4 The engine fresh water shall be treated with a soluble oil inhibitor conforming
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to MIL-I-24453.
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4.4.1.5 Fuel used during the tests shall be diesel fuel conforming to MIL-F-16884
with a minimum sulphur content of 0.7 percent. A laboratory analysis of a sample taken from
each lot of fuel used shall be included in the final report.
4.4.2 Test.
4.4.2.1 Torsiograph. When required (see 6.2.1) , torsiograph tests shall be conducted
in accordance with type III of MIL-STD-167-2.
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Engines shall be run for 125 eight-hour cycles as follows:
4.4.2.2 Endurance.
(a)
2 hours at rated-load and speed.
1 hour at 85 percent load and rated-speed.
(b)
10 minutes at minimum or zero load and rated idling speed.
(c)
1 hour and 50 minutes at rated-load and speed.
(d)
10 minutes at minimum or zero load and rated idling speed.
(e)
30 minutes operation at 50 percent load and 75 percent rated-speed for
(f)
(Propulsion
propulsion engines and rated-speed for constant speed engines.
engines shall be operated in reverse.)
10 minutes at minimum or zero load and rated idling speed.
(9)
10 minutes at 85 percent load and rated-speed.
(h)
(i)
1 hour and 50 minutes at 110 percent rated-load at rated-speed.
10 minutes shut-down (minimum between each cycle).
(j)
Engines may be shut-down, as required, between each complete cycle or full cycles may be
run on a continuous basis. However, forced shut-down(s) , as defined below, which cause
cessation of the endurance test will require the test to be repeated starting from the
first cycle.
(a) A forced shut-down of the test engine due to failure of a part or component
that cannot be corrected or repaired within 2 hours from shut-down or
(b) TWO forced shut-downs of the test engine for any length of time due to
failure of the same part or component, or
(c) Any forced shut-down of the test engine which requires access to the internal
parts of the crankcase, geartrain (accessory drive), or to the camshaft,
cylinder liners, pistons, valves, and rings.
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At the end of each of the last ten cycles of the test the engine shall be stopped utilizing
the emergency shut-down device.
4.4.2.2.1 Compression pressures for each cylinder at idling speed, and firing pressure
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at rated-load and speed shall be obtained after endurance tests on all engines over 6 inch
bore.
4.4.2.2.2 The method of assembly and the tightness of joints in the engine piping
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system, after being fully assembled on the engine, shall be tested under pressure equal to
a test pressure 50 percent in excess of the working pressure prior to the endurance test.
4.4.2.2.3 During the endurance test, the fuel consumption and exhaust gas temperatures
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for runs not less than 1/2 hour shall be recorded. Fuel pump rack setting, if available,
shall be recorded for all test loads.
4.4.2.2.4 Spectrometric oil analysis. Lubricating oil samples shall be taken from the
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lube oil scavenge line before the lube oil filter with the engine running. The oil must be
circulating and at operating temperature. Samples shall not be taken from a gage line.
4.4.2.2:4.1 Samplinq intervals. Samples shall be drawn during the 2 hours at rated-
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load and-speed period of the first and last cycle specified in 4.4.2.2 and during the same
period of each ten cycles during the test (total 14 samples).
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