Abstract: A method for measuring interference between a valve and a piston, includes the steps of measuring a standard torque value, related to camshaft distortion caused by engine RPM, through voltage detecting means; measuring torsional distortion deviation of a crankshaft and an injection pump shaft by fixing the camshaft and forcibly rotating the crankshaft by said standard torque value; measuring vibration generated when the camshaft, the crankshaft, and the injection pump shaft are rotated, and measuring a crankshaft rotational angle to detect a piston TDC position, both measurements being conducted at a predetermined level of engine RPM; displaying piston and intake/exhaust valve movement on a graph at the piston TDC position after analyzing torsional distortion deviation and vibration of each shaft; and determining whether there is interference between the intake/exhaust valve and the piston by comparing design values with that displayed on the graph.

Abstract: A method for measuring interference between a valve and a piston, includes the steps of measuring a standard torque value, related to camshaft distortion caused by engine RPM, through voltage detecting means; measuring torsional distortion deviation of a crankshaft and an injection pump shaft by fixing the camshaft and forcibly rotating the crankshaft by said standard torque value; measuring vibration generated when the camshaft, the crankshaft, and the injection pump shaft are rotated, and measuring a crankshaft rotational angle to detect a piston TDC position, both measurements being conducted at a predetermined level of engine RPM; displaying piston and intake/exhaust valve movement on a graph at the piston TDC position after analyzing torsional distortion deviation and vibration of each shaft; and determining whether there is interference between the intake/exhaust valve and the piston by comparing design values with that displayed on the graph.