Determination of Iron Contamination of Used Lubricating Oil for Use in Measuring Rates of Wear in Aircraft Engines Page: 3 of 16
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UE III 1III I I El - Em I I 1111 1 -
82 EASA RB Jo. 4025
4. Etraction of lubricating-oil samples with dilute
hydrocloric acid for 4 hours yielded a recovery of 98 per-
cent of the iron in the oil.
5. With calibration, any photoelectric or visual-
type colorimeter will be found suitable for measurement
of the color intensities of the iron o-phenanthroline so-
lutions. Comparison of results obtained for the same
solutions with a spectrophotometer and a colorimeter
showed an average difference of less than 3 percent.
INE ODUC ION
Analysis of lubricating-oil samples for metallic con-
taminants as a method of determining rates of wear of
internal-combustion engines offers a number of advantages
over mothods that involve mochanical measurements of the
engine parts. Samples of the lubricating oil are with-
drawn from the engine at periodic intervals and analyzed
by soensitivo chemical methods. The metallic concentra-
tions, plotted against engine running time, yield a curve
of progressive metal contamination from which the rate of
wear at any time during the run can be calculated. Tho
rate of wear can be established in considerably less
engine running time than would be roquirod to produce a
significant change in weight or dimensions of engine
parts and without tho necessity of dismantling or stopping
tho oncizo. In application of this method, the wear or
corrosion of a particular engine part or combination of
parts can bo measured only if the wear of other engine
parts dcos not appreciably contribute to the concentration
of tho total contaminant in the oil.
Anong the metallic contaminants in oil, iron is of
particular interest in the study of wear rates. When
aluminum pistons arc used in tho ongino, the iron in the
oil is principally due to abrasion of the cylinder walls
and those piston ring. Bcauseo most of the abraded iron
is washed into the crankcase by the lubricant, periodic
analysis of the iron contamination of the oil will indi-
cato the rate of wear of the cylinder barrel and the pis-
ton rings.
?rocoduroe for analyzing iron in lubricating oil can
bo resolved into two stops: (1) the eoparation of tho
iron from tho organic m~attor and (2) tho dotormination of
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Tischler, Adelbert O. Determination of Iron Contamination of Used Lubricating Oil for Use in Measuring Rates of Wear in Aircraft Engines, report, March 1944; (https://digital.library.unt.edu/ark:/67531/metadc62322/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.