INTRODUCTION ENGINE SERIAL NUMBER AND EMISSION LAB EL The engine serial number is stamped on a plate located on top of the engine valve cover. The emission label is located on the right side of the valve cover. FRONT AXLE SERIAL NUMBER The serial number for the front axle is stamped on a plate located on the right side of the axle housing. REAR AXLE SERIAL NUMBER The serial number for the rear axle is stamped on a plate located on the right side of the axle housing. WB140-2N, WB150-2N 0-7