1939-01-01

Some Developments Relative to Crankcase-Oil Filtration 390123

DATA are presented to show that compounded lubricants for use in the lubrication of high-speed Diesel engines have come to be regarded as indispensable, and to demonstrate their influence in high-temperature operation on engine deposits, oil deterioration, and strength and corrosion of bearing metals.
The author divides filters into two general classes: the adsorbent type and the absorbent type. Adsorbent filters, the paper explains, incorporate in their composition Fuller's earth, charcoal, or other adsorbent materials and attempt to incorporate features which have as their object the refining of oil. Tests are described, the results of which lead the author to the conclusion that such filters remove addition agents used in compounding Diesel engine lubricants to a surprising degree and, therefore, are detrimental in such applications.
Test results on the absorbent-type filter-those that utilize as their filtering medium cotton fiber, yarn, waste or other materials of this nature-are discussed. It is pointed out that this type of filter will remove materials of considerably smaller particle magnitude than will the positive-type filter.

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