Measurement of the Ring to Liner Oil Film Thickness in a Caterpillar 1-G Diesel Engine

Capacitance film thickness transducers have been developed which, when fitted into the cylinder liner of a diesel engine, enable the operating profile of the piston ring and the ring to liner oil film thickness to be obtained. The construction and operation of the gauges are described and some measurements are presented from the mid-stroke and top-dead-centre positions in a Caterpillar 1-G oil test engine.