Abstract

By collecting the oil moving down to the sump in a gutter at the bottom of the liner, a great improvement in sensitivity is obtained. The difference between the activity of this oil and that of the sump oil, by which the ring belt area is fed, is continuously registered. The curve obtained represents the variations of instantaneous wear-rate, and by integrating the graph of oil volume versus activity, we can obtain the “apparent wear”, as carried in the oil. A complete balance of wear in every possible direction (oil, rings, grooves and exhaust) gives for different types of oil the coefficient to be applied to “apparent wear” to obtain “real wear”, or total wear.

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