Abstract
1. In order to ensure long engine life without overhaul, the crankcase oil must have the alkaline reserve needed to neutralize the corrosive compounds that are formed. When diesels are operated on high-sulfur fuels with oils having low pH values (below 5), even though this does not lead to the accumulation of any significant amount of free sulfuric acid in the crankcase, such conditions are associated with increased wear, varnish formation, etc. 2. Oxidation of oils in an engine with sulfur present in the fuel leads to a reduction in the oil film strength, this effect becoming more evident when the sulfur content is substantial. The decrease in oil film strength in turn has an undesirable effect on the operation of the piston rings and cylinders of the engine. Further, additional quantities of additive are consumed in neutralizing the acid products formed in the process of oil oxidation. 3. Computational equations have been presented for determining the alkalinity of an oil operating in an engine.
Published Version
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