( 1 ). The lubricating oil five functions:
A. lubrication: provide lubricating oil separated friction surface membrane, the engine cold start wear accounted for the overall wear 70%.
B. clean: from lubrication NSK bearing the pollutant cleaning down, and dispersed into tiny particles discharge.
C. cooling: reduced because of friction heat, the heat away by circulating cooling.
D. anticorrosion: prevent corrosion of parts of the air and water.
E. sealing: preventing gas channeling.
Lubricating oil with the above five functions, but if the use of lubricating oil quality is not good or improper use of, will bring some problems to the engine.
( 2 ) . The harm of inferior oil
A. burning bush: if the quality selection of lubricating oil is not good, or the selection of lubricating oil viscosity is wrong, the lubricating effect is not good. And low oil pressure, engine oil cooling system, such as lack of fault can cause the engine overheating. In this case the high-speed operation, it is easy to be NSK bearings damage, commonly known as "burning tile ". In addition, if use inferior oil filter or did not change the oil filter element in time, will make the impurities caught in the meantime, resulting in " burning tile ".
The B. clasp: if the oil clean dispersion is not good, long-term use will produce coke in the piston ring around the coke, and serious when can cause death or breaking of piston ring.
C. oil consumption is too large: if the antiwear properties of lubricating oil is not good, will cause the abrasion between piston ring and cylinder intensifies, oil ring oil scraping effect is reduced, so that the oil into the combustion chamber for combustion, the blue smoke phenomenon. If the engine seal is not good, valve oil retaining ring failure will cause oil leakage, will also speed up the oil consumption.
Warning D. machine oil: once this kind of phenomenon is found in the following reasons: lack of lubricating oil ( add ); damage to oil induction plug ( replacement); engine oil filter plug ( cleaning ); viscosity of lubricating oil shortage ( to replace oil or check whether the fuel dilution and engine oil pressure limiting overheating ); valve spring failure ( cleaning and replacement ).