Patent ID: 6205850
Filing Date: 2001-03-27
Classification: F01L

Abstract:
A method for setting a clearance between a tappet screw and an engine valve, comprising the steps of:establishing a known cam shaft orientation;providing a desired clearance distance between said tappet screw and said valve;assuming a valve-seated position;determining a pre-zero point of the valve at the assumed valve-seated position;advancing the tappet screw toward the valve;contacting the valve with the tappet screw and moving the valve away from the assumed valve-seated position a predetermined distance;reversing the tappet screw to move the valve toward the assumed valve-seated position;establishing at least one imaginary zero point while moving the valve toward the assumed valve-seated position, said imaginary zero point falling in a band of linear displacement of the valve between said predetermined distance and said assumed valve-seated position;assuming a predetermined linear travel of the valve from the pre-zero point to the imaginary zero point;determining further linear travel of the tappet screw necessary to provide the desired clearance distance based upon the predetermined linear travel and the desired clearance distance; and,moving the tappet screw an amount equal to the determined further linear travel to place the tappet screw at the desired clearance distance from said valve.