The effect of the use of the EGR system on the lubrication of a passenger car diesel engine was investigated. The higher the EGR rate, the more soot in the oil. And the most detrimental effect was found in valve train wear. Some engine tests, including motoring tests, were carried out to investigate the contribution of soot to valve train wear. The mechanism of cam and rocker arm wear in used oils was studied by analyzing for elements on the lubricated metal surface and subsequently the mechanism was more thoroughly studied using the four-ball test. Soot seems to act as an abrasive on the anti-wear solid film formed by the oil on the metal surface and this film contains Ca, O, P and S. Some hardware modifications and oil formulations to reduce valve train wear are also discussed.


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    Titel :

    Soot and Valve Train Wear in Passenger Car Diesel Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Nakamura, Hideo (Autor:in) / Endo, Hiroyasu (Autor:in) / Yano, Hisashi (Autor:in) / Nagai, Isamu (Autor:in)

    Kongress:

    1983 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1983



    Erscheinungsdatum :

    31.10.1983




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Soot and valve train wear in passenger car Diesel engines

    Nagai,I. / Endo,H. / Nakamura,H. et al. | Kraftfahrwesen | 1983




    Relationships Among Oil Composition, Combustion-Generated Soot, and Diesel Engine Valve Train Wear

    Kim, Changsoo / Passut, Charles A. / Zang, Daniel M. | SAE Technical Papers | 1992


    Soot and Wear in Heavy Duty Diesel Engines

    Mainwaring, R. / Society of Automotive Engineers | British Library Conference Proceedings | 1997