THE DEVELOPMENT AND APPLICATION OF FERROGRAPHY TO THE STUDY OF DIESEL ENGINE WEAR

Ferrographic oil analysis of wear measurement is compared with both the radioactive tracer method and spectroscopic oil analysis, and is described in depth. Metallic wear debris is magnetically separated from a lubricant sample, systematically arranged according to size on a glass substrate, and examined by either a scanning electron microscope or transmission electron microscope. Ferrography is easily adaptable to either laboratory or field analysis. Its disadvantage is that it cannot detect the soluble portion of wear which is often due to corrosion. The technique is described in detail. Test data of the ferrographic oil analysis technique made with a direct injection, four-cycle, turbocharged diesel engine show that ferrography is sensitive enough to indicate changes in engine operating conditions. Data indicate operating time on engine oil for steady state engine operation to approach finite concentrations with time. Engine oil filtration is beneficial. Ferrography is shown to be the most versatile method of analyzing severe wear and detecting failure.

  • Supplemental Notes:
    • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978. Sponsored by Kysor of Cadillac (radiator shutter mfr.).
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Hofman, M V
    • JOHNSON, J H
  • Publication Date: 1978

Media Info

  • Features: References;
  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00395165
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780181, HS-025 328U
  • Files: HSL, USDOT
  • Created Date: Jun 30 1985 12:00AM