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The Effect of Filtration on Fuel Injector Erosion Due to Fuel/Oil Blending as Measured by Surface Layer Activation
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Abstract
In order to increase service intervals and reduce the amount and cost of waste disposal, many heavy duty diesel engine operators are investigating the technique of continuously blending small amounts of used lubricating oil into the fuel system for burning while replenishing the sump with fresh oil. The purpose of this study is to investigate the effect that this practice would have on erosion in fuel injectors and, additionally, to establish the level of fuel filtration efficiency needed to prolong injector life. Surface layer activation was used in an 11 liter diesel engine to measure erosion rates during engine operation as concentrations of used oil from 0 - 4% were blended into the fuel. A spot between the spill ports in an injector barrel was irradiated as a critical erosion location and the engine was run near full rated power for 24 hour test increments to establish erosion rates. Levels of fuel filtration tested on-engine included no filtration, a convention cellulose filtration medium, and a high efficiency, multilayered, synthetic medium. Fuel / oil blend cleanliness was determined using a screen obstruction technique. The effects of oil concentration and fuel / oil cleanliness, as affected by fuel filtration, were established and the test cell results are correlated with field experience.
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Citation
Truhan, J., Stehouwer, D., Covington, C., and Wood, L., "The Effect of Filtration on Fuel Injector Erosion Due to Fuel/Oil Blending as Measured by Surface Layer Activation," SAE Technical Paper 972951, 1997, https://doi.org/10.4271/972951.Also In
References
- Blatchley C. Sioshansi P. “Monitoring Wear with Gamma Rays,” Machine Design Oct. 25 1990
- Truhan J. J. Covington C. B. “The Use of Direct Method Surface Layer Activation to Measure Wear in a Diesel Engine,” SAE 931627 Society of Automotive Engineers Warrendale, PA 1993
- Truhan J. J. Covington C. B. Colerico C. Blatchley C. “The Importance of Diesel Oil Filtration Demonstrated by Surface Layer Activation Wear Monitoring,” Advanced Materials and Process Technology for Mechanical Failure Prevention, Proceedings of the 48th Meeting of the Mechanical Failures Prevention Group Vibration Institute Willowbrook, IL 1994 433 441
- Truhan J. J. Covington C. B. Wood L. M. “The Classification of Lubricating Oil Contaminants and Their Effect on Wear in Diesel Engines as Measured by Surface Layer Activation,” SAE 952558 Society of Automotive Engineers Warrendale, PA 1995