The formation of carbonaceous deposits on upper lands and ring grooves of diesel pistons is believed to be a t least partially responsible for excessive cylinder bore wear and loss of oil control infzeld service. A properly formulated diesel lubricant has, among other performance characteristics, the ability to control piston deposits, thereby fmproving overall engine performance.lhis paper describes both the chemical and physical composition, and themorphology, ofpistondeposits formedinseveralmqjorEuropeanand American diesel lubricant qualijlcationengines. Lubricant chemistry and piston temperature are shown to have a mafor influence upon deposit composition, whereas combustion soot constitutes a minorfraction of the deposit structure. Fine details within crown land and top ring groove deposits are examined through the application of Fourier Transform Infrared Spectroscopy, Thermal Gravimetric Analysis and Scanning Electron Microscopy .
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