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|  MIL-G-24477(SHIPS)
lubricating oil and oil changes shall be recorded. Readings of instruments shall be recorded
at intervals not exceeding 1 hour. When a phase of a test is of such short duration that
operating temperatures cannot be stabilized, no reading is required.
4.4.3.2 Spectrometric
anlysis. The following information/data shall be provided:
(a) List of oil wetted wearing parts and corresponding wear metal elements.
(b) Recommended limits in ppm of the wear elements/metals listed in 4.4.3.2(a).
It is the intent to use these values as a basis to segregate normal from
abnormal operating machinery.
(c) Tabulation of the analysis data recorded in accordance with 4.4.2.3.2. Tab-
ulation shall include such related and pertinent data as chemical and physical
characteristics of the lubricating oil used during the test, initial quantity
of oil in the system, hours of operation from start of test at which oil was
added\changed and applicable quantity of oil added/changed.
4.4.4 Post trial examination. After completion of all tests, the engine shall be
disassembled and examined. For this purpose, all cylinders shall be opened, pistons pulled
and the cylinder bores, pistons, piston rings, wrist pins, and crankpin bearings examined
for defects and measured for wear. Gear train covers and all crankcase covers shall be
removed for examination of internal parts. The engine shall be barred over during examina-
tion to determine extent of backlash in gear trains. Mating surfaces of gears and all
bearings shall be checked for distress such as pitting and galling. Excessive wear, broken
or damaged parts, scored cylinders, burned valves or signs of severe stress or excessive
wear shall be cause for rejection of the unit. Excessive wear is defined as wear in excess
of the manufacturer's published wear limit for the particular part. Cavitation erosion of
cylinder liners or cylinder blocks to the extent that such distress would cause premature
replacement of the part shall be cause for rejection of the unit.
4.4.4.1 Special tools furnished with the engines shall be tried out on the engine
during the post trial examination, before examination can be considered complete.
4.4.5 Complete test report. In addition to the documented results of the post trial
examination (see 4.4.4), the complete first unit test report shall be submitted to NAVSEC
for review and final acceptance and shall include the following data:
(a) Fuel consumption (see 4.4.2.2).
(b) Spectrometric analysis (see 4.4.3.2).
4.4.6 Duplicate engine routine tests. production engines, duplicates of one which
has been tested in accordance with 4.4.2, shall be tested as follows:
Two 8-hour cycles as specified in 4.4.2.1.
(a)
24 hours as specified in 4.4.2.5.
(b)
8 hours as specified in 4.4.2.7.
(c)
4.5 Generator set test. The first combined diesel generator set including attached
and unattached accessories of each size and design offered for delivery shall be subjected
to the lead set tests specified in table II. No lead set tests will be required thereafter
as long as identical designs are offered or design changes are minor and do not effect
The tests shall be conducted with all the intended electrical equipment and
performance.
attached and unattached accessory equipment.
4.5.1 All duplicate diesel generator sets shall be given the following set tests as
specified in table II.
4.6 Test.
4.6.1 Generator air-gap. The minimum air-gap shall be measured by steel feelers or
gages. The measurements shall be made for each pole, with at least one of the measurements
made at the bottom.
4.6.2 Two hour preliminary run. The generator set shall be operated at full load for
2 hours to bring it up to or near its operating temperature. During this period the general
operation of the set shall be observed and any necessary adjustments shall be made.
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