VALVE TRAIN WEAR AS AFFECTED BY-----Metallurgy Driving Conditions, and Lubricants - Report of the Field Survey of the Camshaft and Valve Tappet Wear and Corrosion Group of the Engine Lubricants Division of the Coordinating Lubricant and Equipment Research Committee of the Coordinating Research Council, Inc. 580025

THIS paper is a report of tests performed in 1956 by the Camshaft and Valve Tappet Wear Croup of the Coordinating Research Council. Cam and tappet wear, spading, and scuffing were studied as functions of valve-gear design, metallurgy, lubricant properties, and type of operation.
Some of the results announced by the Croup are:
  1. 1.
    Oil composition had considerable effect on cam and tappet wear when chilled-cast-iron or steel tappets were used, and on the spalling of the former.
  2. 2.
    Only chilled-cast-iron tappets showed appreciable spalling tendency.
  3. 3.
    Tappet scuffing was more dependent on metallurgy-design than on oil composition.
  4. 4.
    Tappet spading tendency seemed to be related to the rate of wear.


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