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Some Physical Effects of Transmission Fluid Degradation
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English
Abstract
Laboratory studies using bench, chemical and dynamometer tests were carried out to define some of the ways in which fluid degradation may occur and affect the serviceable life of an automatic transmission, as well as how components, individually or in combination, may accelerate or retard fluid degradation. Once these details were defined, the test results indicated two major conclusions. First, degradation products of an automatic transmission fluid (acids, sludges, varnish forming products, and so on) should be considered as new fluid components, since they may have more effect on transmission performance than the original components. And secondly, retention of desirable friction control properties must be a prime consideration in the design of a satisfactory automatic transmission fluid.
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Citation
Liddell, G. and Newingham, T., "Some Physical Effects of Transmission Fluid Degradation," SAE Technical Paper 660097, 1966, https://doi.org/10.4271/660097.Also In
References
- Newingham, T. D. “Automatic Transmission Fluid --Component Effects on Friction.” Paper No. 774A presented at SAE National Fuels and Lubricants Meeting October 1963
- Haviland M. L. Rodgers, J. J. “Friction Characteristics of Automatic Transmission Fluids.” Lubrication Engineering 17 3 March 1961 110 117
- Albertson C. E. Okubo, H. S. “Influence of Lubricant Breakdown on Frictional Performance.” Paper No. 642C presented at SAE Automotive Engineering Congress January 1963
- Nann N. A. Pinchbeck, F. H. “Tailoring Automatic Transmission Fluid Shift Quality in the Laboratory.” Paper No. 650466 presented at SAE Mid-Year Meeting Chicago May 1965
- Chevrolet Motor Div., General Motors Corp. “T-13 Automatic Transmission Durability Test.”
- Route W. D. Winchell, F. J. “Ratio Changing the Passenger Car Automatic Transmission.” Paper No. 311A presented at SAE Automotive Engineering Congress Detroit January 1961