BEARING FAILURES AND DETERGENT OILS
Page 44
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WITH reference to the report in "The Commercial v. Motor" dated -February 27; 1948, dealing with the paper given by me-to the Institute of the Motor Industry at Bradford, I shall appreciate it if you will permit me
to enlarge somewhat upon the subject of detergent oils. It is evident from communications I have received from readers .of your journal that the necessarily brief report by your correspondent, with the unavoidable
removal ofthe subject matter from its context, has created a false impression regarding the efficacy of detergent oils, when in fact the. reference in my paper
was specifically to the effect upon bearings when the
recommendations of the detergent-oil suppliers were not earned -out.
If is known that when detergent oils are introduced to an already dirty engine, carbonaceous matter may
be loosened from rings, etc., and much of this matter• may be ground into the surface of the bearings before the filter cari.remove it. The makers of detergent oils issue specific instructions regarding the flushing out of engines,and the frequency of oil and filter changes,
under such conditions. " ,
During the course. of my lecture, one slide was shown illustrating the deposition of carbonaceous matter upon a bearing surface, caused . by changing over a used
engine, previously running on straight mineral oil, to adetergent oil,'without due regard to the recommendationi of the oil suppliers when such change is made.
London, W.5. PHILLIP T. HOLLIGAN, Technical Adviser.
(For the Glacier Metal Co., Ltd.)