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|  MIL-G-24477(SHIPS)
4.6.9 Diffectiveness of enclosure. Enclosure tests shall be conducted in accordance
with MIL-E-2036 on the electrical portion of the generator set, where it is evident that
the effectiveness of any enclosure-has been altered by assembly as a part of the generator
set.
4.6.10 Torsiograph test. Generator set shall be tested in accordance with type III
requirements of MIL-STD-167.
4.6.11 Lubrication.
Performance of the lubricating system shall be determined by a
careful observation and general examination of the parts. Limitation of the generator
bearing temperatures, as specified in MIL-G-3124 shall not be exceeded. This test may be
made at no-load provided the bearing load is not influenced appreciably by the load condition
of the generator. Lubricant similar to that required for service operation shall be used.
4.6.12 Starting tests.
4.6.12.1 Cold start. Prior to conducting the cold start test the diesel generator set
shall have been shutdown for at least 12 hours. Cold water, at a temperature not exceeding
35F., shall be circulated through the engine for not less than 1 hour or until the outlet
temperature of the water does not exceed 38F. Compliance with the requirements of 3.1.14
shall be demonstrated.
4.6.12.2 Normal starting. Immediately following the cold start test (see 4.6.12.1)
nine conseculative starts shall be made under normal ambient conditions. The average time
required to start the unit, and the minimum starting r.p.m. shall be determined. The engine
shall fire and continue operating within 5 seconds after the starting mechanism is engaged.
4.6.12.3 The following data shall be obtained:
Minimum quantity of air expressed in cubic feet of free air at 14.7 p.s.i.,
(a)
and 68F., for the cold start.
(b) Minimum quantity of air expressed in cubic feet of free air at 14.7 p.s.i.,
and 68F., necessary for 10 successive starts, including the cold start.
(c) Minimum air pressure at which the unit will start within the 5 second time
limit.
4.6.13 Inclined operation. The inclination test shall be made with the unit running
at 60 cycle speed with or without load for at least 30 minutes in each of the following
positions:
inclined, forward end down 7 degrees.
(a)
Shaft
(b)
Shaft
inclined, forward end up 7 degrees.
(c)
Shaft
horizontal, base inclined to right 15 degrees.
horizontal, base inclined to left 15 degrees.
(d)
Shaft
4.6.13.1 During the tests of 4.6.13, the lubricating oil sump(s) shall be filled to
the maximum operating level. It shall be ascertained that the mechanical balance is as good
as it was in the horizontal position, that there is no pounding or grinding of the bearings,
and that there is no leakage of oil or cooling water.
4.6.14 Weight and center of gravity. The generator set and all detached accessories
shall be weighed dry. The center of gravity for the generator set (if feasible) shall be
determined by actual measurement. If-measurement of the complete generator set is not
feasible, its center of gravity shall be calculated using weights and center of gravity
figures for components obtained by actual measurement.
4.6.15 Mechanical shock (see 6.1). The complete diesel generator set shall be tested
in accordance with the requirements of the Appendix to this specification.
4.6.17 Maintainability
demonstration. The reliability demonstration test, if required,
shall be as specified (see 6.1).
4.6.17 Maintainability demonstration test. A maintainability demonstration test shall
be conducted to verify the achievement of the quantitative value of predicted maintainability
specified in 3.1.2.7. The demonstration shall be conducted in accordance with MIL-STD-471
(see 6.2) except as modified herein.
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