Grading tool for measuring a rocker arm and rocker arm grading system

A rocker arm grading system, comprising:

• a rocker arm jig comprising a pivot peg and a valve peg;
• a rocker arm removably mounted to the rocker arm jig, the rocker arm comprising a radius on a bearing surface;
• a cam jig comprising a cam arm;
• a cam pin mounted in the cam arm, the cam pin comprising a cam edge for pressing against the bearing surface;
• and
• at least one measuring device comprising a wavelength emitting device paired with a wavelength detecting device, the measuring device configured to measure the radius of the bearing surface with respect to the pivot peg.

A method of grading a rocker arm, comprising:

• pressing a cam edge of a cam pin against a bearing surface of a rocker arm;
• applying an emitted wavelength of at least one measuring device to the rocker arm and to a rocker arm jig comprising a pivot peg and a valve peg;
• detecting the applied emitted wavelength to collect profile data of the rocker arm;
• processing the collected profile data to determine measurements of the rocker arm;
• and
• grading the rocker arm according to the determined measurements.