6 INTRODUCTION Engine Information Plate In compliance with Federal and California emission requirements, an engine information label is affixed to all MACK diesel engines. This label, which is located on the cylinder head cover at the front of the engine, gives basic engine identification information (engine model, serial number, etc.), advertised horsepower at rated speed, emissions regulations to which the engine conforms and inlet and exhaust valve lash settings. Examples of the 49 state EPA approved, and 50 state EPA and California approved engine identification labels are given below.
W2040455 Engine Identification Label - 49 State EPA Approved Engine without California "Clean Idle" Engine Identification Label - 50 State EPA Approved Engine with California "Clean Idle" W2040456