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Relationships Among Oil Composition, Combustion-Generated Soot, and Diesel Engine Valve Train Wear
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Abstract
Oil formulation has been found to be a significant factor in high rates of 6.2 L diesel engine, roller hydraulic valve lifter wear that occurred in field service with some commercial engine oils. This was confirmed through engine-dynamometer testing. A correlation has been established between engine-dynamometer wear test results and those obtained in laboratory four-ball wear tests conducted with used engine oil. The effects of dispersant level, viscosity, sulfonate metal type, sulfonate total-base-number, zinc dialkyl dithiophosphate (ZDTP) type, and ZDTP concentration on wear were systematically investigated. Wear increased with increasing soot concentration in the oil, and decreased with increasing sulfur concentration, both in the oil and on the metal surface. Wear also decreased with increasing dispersant concentration. The remaining oil variables had minimal effects on wear within the ranges studied. Diesel engine wear occurs when soot either prevents antiwear film formation on metal surfaces, or removes the antiwear film shortly after formation.
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Kim, C., Passut, C., and Zang, D., "Relationships Among Oil Composition, Combustion-Generated Soot, and Diesel Engine Valve Train Wear," SAE Technical Paper 922199, 1992, https://doi.org/10.4271/922199.Also In
References
- Rounds, F. G. “Carbon: Cause of Diesel Engine Wear?” SAE 770829
- Ryason, P. R. Chan, I. Y. Gilmore, J. T. “Polishing Wear by Soot,” Wear 137 15 24 1990
- Berbezier, I. Martin, J. M. Kapsa, Ph. “The Role of Carbon in Lubricated Mild Wear,” Tribology International 19 3 115 1986
- Berbezier, I. Martin, J. M. “The Adverse Effect of Carbon in Mild Wear with ZDDP lubricant Additive,” Tribology International 21 2 89 1988
- Hosonuma, K. Yoshida, K. Matsunaga, A. “The Decomposition Products of Zinc Dialkyldithiophosphate in an Engine and Their Interaction with Diesel Soot,” Wear 103 297 1985
- Rounds, F. G. “The Generation of Synthetic Diesel Engine Oil Soots for Wear Studies,” Lubrication Eng. 384 July 1984
- Coughlin, R. W. “Carbon as Adsorbent and Catalyst,” I & E C Prod. Res. & Develop 8 1 12 1969
- Rivin, D. “Surface Properties of Carbon,” Rubber Chem. & Technol. 44 2 307 1971
- Rounds, F. G. ‘Soots from Used Diesel Engine Oils - Their Effects on Wear as Measured in 4-Ball Wear Tests,” SAE 810499
- Rounds, F. G. “Effect of Lubricant Additives on the Prowear Characteristics of Synthetic Diesel Soots,” ASLE 43 4 273 1986
- Abell, R. F. “I.C. Engine Cam and Tappet Wear Experience,” SAE 770019
- Brown, E. D., Jr. “Friction and Wear Testing with a Modern Four-Ball Apparatus” Wear 17 381 88 1971
- Neale, M. J. “Nature of Surfaces and Contact,” Tribology Handbook F1 John Wiley & Sons 1973
- Swarin, S. J. Wims, A. M. “Applications of Integral and Derivative Thermo-gravimetry to the Analysis of Rubber Formulations,” Rubber Chem. Tech. 47 1193 1974
- Nicoli, D. F. McKenzie, D. C. Wu, J. S. “Application of Dynamic Light Scattering to Particle Size Analysis of Macro-molecules,” American Laboratory 32 40 Nov. 1991
- Berne, B. J. Pecora, R. Dynamic Light Scattering John Wiley New York 1976
- SAS/STAT User's Guide 1 4th 1989 SAS Institute, Inc., Cary North Carolina
- SAS Procedures Guide 3rd 1990 SAS Institute, Inc., Cary North Carolina
- Inoue, K. Watanabe, H. “Interactions of Engine Oil Additives,” ASLE May 1982
- SAS/STAT User's Guide 2 4th 1989 SAS Institute, Inc., Cary North Carolina
- Coy, R. C. Jones, R. B. “The Thermal Degradation and EP Performance of Zinc Dialkyldithiophosphate Additives in White Oil,” ASLE Trans. 24 1 77 1981
- Jones, R. B. Coy, R. C. “The Chemistry of the Thermal Degradation of Zinc Dialkyldithiophosphate Additives,” ASLE Trans. 24 1 91 1981
- Rounds, F. G. “Contribution of Phosphorous to Antiwear Performance of Zinc Dialkyldithiophosphates,” ASLE Trans. 28 4 475 1985