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The Control of Piston Crownland Deposits in Diesel Engines through Oil Formulation
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English
Abstract
Newer design direct injection diesel engines show tighter top land clearances between piston and liner. An industry specification, PC-1, is being worked on to define the lubrication needs of these new tight top land direct injection engines. Multi cylinder diesel dynamometer tests show that the reduction of top land deposits in these new design engines tends to improve oil consumption and engine life. A main contributor to these deposits is the ash content in the lubricating oil. Evaluations run in a Cummins NTC 400 dynamometer test show that lower ash oils tend to form fewer crownland deposits and give lower (better) oil consumption. A field test run using Cummins NTC 400 engines on 11 oils confirmed the dynamometer data. Included in the field testing were a very low ash oil (0.5 wt%) and an ashless oil, each having carefully balanced formulations. These two oils provided the best overall control of top land deposits and showed no debits in operation compared to the other oils tested.
Authors
Citation
Schetelich, A. and Fetterman, G., "The Control of Piston Crownland Deposits in Diesel Engines through Oil Formulation," SAE Technical Paper 861517, 1986, https://doi.org/10.4271/861517.Also In
References
- Hercamp, R. D. Premature Loss of Oil Consumption Control in a Heavy Duty Diesel Engine SAE Paper 831720 presented at the SAE Fuels and Lubricants Meeting San Francisco, CA Oct. 31 Nov. 3 1983
- Schetelich, A. A. The Effect of Lubricating Oil Parameters in PC-1 Type Heavy Duty performance, SAE Paper 832722 presented at the SAE Fuels and Lubricants Meeting San Francisco, CA Oct. 31 Nov. 3 1983