OIL DILUTION
Of any part of the engine the valve guides receive the least lubrication. They are not in the direct path of the oil mist in the crankcase nor ean they be lubricated hy pressure, but instead receive a doubtful quantity of lubrication hy a method that is by no means positive. Consequently in many a motor it is found that the valve guides are so worn that they must he replaced hefore many thousand miles are covered. It is practically impossible to provide adequate lubrication for the tops of the valve guides, and this is the point where it is rnostly required. As soon as the valve guides haye become worn, exhaust gases leading down hetween the valve stem and the guide, enter the valve chamber and crank-case. Similarly, petrol vapour can enter down the guides of the inlet valves and cause dilution of the oil in the engine, and in addition to this air in the crank-case can enter the induction pipe through worn inlet valve guides, and, by weakening the mixture, cause irregular slow running of the motor.
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Bibliographic details
Rotorua Morning Post, Volume 2, Issue 332, 20 September 1932, Page 2
Word Count
182OIL DILUTION Rotorua Morning Post, Volume 2, Issue 332, 20 September 1932, Page 2
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