Automatic Cleaning on New Engine-oil Filter T HERE is, perhaps, no
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better known 1 name in the filtration field than that of Stream-Line Filters, Ltd., and it is, therefore, of interest that this concern is now marketing a component, embodying the efficient Stream-Line features for use on coinmercial-vehicle engines.
It should be unnecessary to point out how desirable it is to keep the engine oil as free as possible of all contaminating matter, because, although periodical crankcase drainage is effective, it is not the same as keeping the oil clean from the moment it is put into the sump.
Increasing interest is being shown in the permanently installed filter, and Stream-Line Filters, Ltd., has recently entered the market with a component, known as model MC7, embodying the principle of edge-filtration as employed in its well-known oil-recovery plants.
No reliance is, therefore, .placed on absorbents or media of this nature, the process being purely mechanical. This is made possible by the employment of what are known as filter packs, which consist of a large number of discs of paper tightly compressed to form a pile. As each disc has a hole
£34 in the centre the packs virtually form laminated paper tubes.
Oil entering ths filter body must pas through these packs before reaching the filter head, so that the degree of filtration which is secured is extremely high. The effect is that, whilst the clean oil passes between the paper discs and so back into circulation, the impurities are arrested by the edges. This being so, it will readily be understood that it needs only a reversal of pressure through the filter to dislodge any foreign matter accumulating on the filter packs.
This process is entirely automatic through a device, positioned in the head of the filter, which causes a small quantity of oil to reverse its flow every time the engine is stopped.
The effect of this is that the impurities, which are arrested on the outside of the filter packs, become dislodged and concentrate in the base of the filter. Occasionally, therefore, it becomes necessary to open the drain plug, in order to release these deposits —normally about every 10,000, mi4es.
Further information as to installation and prices can be obtained from Stream-Line Filters, Ltd., Hele-Shaw Works, Ingate Place, London, S.W.S.