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Q I have been advised that using a by-pass oil filter
Page 105
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can be highly recommended as a means of increasing engine life. What is your view.
operate a small fleet of vehicles in Dienedin, New Zealand, and have heard that the mileage life of an engine between overhauls can be increased by 100 per cent by employing a filter of this type.
A Employing a by-pass filter in addition
to a full-flow type can be highly recommended. Blockage of a full-flow filter results in total starvation of the bearings and so on and seizure of the engine while blockage of a by-pass type does not reduce the amount of oil flowing through the system. It would not be advisable to fit a full-flow filter that extracted very fine particles from the system as it would restrict flow and the build up of trapped particles would be accelerated. It is pertinent that a filter operates at its greatest efficiency when it is approaching the fully blocked state, but this is also a highly dangerous condition for obvious reasons.
Because starvation cannot result from blockage of a by-pass filter, an element giving fine filtration can be safely used and the rate of circulation can be increased to the maximum allowable by the capacity of the pump. It is essential, however, to maintain the rated oil pressure of the system and the fitting of a by-pass filter as an auxiliary should be undertaken by a specialist.