Abstract: A tool and method for automatically adjusting internal combustion engine valve lash is disclosed. The engine is first rotated to correctly position the valve lifter cam for the individual valve which is to be adjusted. The novel tool of this invention is then positioned and sequenced through a series of operations which properly set the valve lash or preload, whichever is required. The system uses a linear variable differential transformer probe in the preferred embodiment to establish when the valve is seated. The valve lash adjusting means is advanced until the rocker arm engages the valve stem. The initial movement of the valve stem is sensed by a linear variable differential transformer and a zero reference is established at the point where the valve just begins to move.

Abstract: A fastener tension inspection system for use with torque producing power tools such as nut runners, screwdrivers, or the like. The inspection system includes a means for measuring torque or other tension proportional function applied to a fastener and a means for measuring at least one additional parameter associated with fastener tightening; for example, time or rotation. With appropriate electronic circuitry, the torquing cycle is started by freerunning the fastener and bringing it up to a predetermined low level of torque sufficient to seat the fastener. Upon reaching the predetermined low level of torque, the means for measuring the additional parameter is initiated and continues until final torquing is completed. The predetermined minimum torque level on the fastener must be reached and a predetermined maximum torque level not exceeded within a predetermined range of the additional parameter or the fastener is rejected.