Abstract
Thin gel-like films are seen on the lubricated surfaces within diesel fuel injection equipment. The formation and properties of these films are investigated, under sliding conditions, using disc-on-plane machines; one steel has been used throughout. The development and maintenance of separation is measured by voltage drop and, during running-in to a high conjunction resistance, films are produced which are similar to those seen in practice. It is shown by static tests that separation is maintained by these films, which behave as quasi-elastic solids. The films are not miscible with diesel fuel and are not produced when the fuel is in static contact with the steel. They exhibit similar electrical properties under static and dynamic conditions: this was unexpected and is not yet understood. It is postulated that the films are produced by chemical reactions, and that the surface polishing observed is due to the same reactions
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