This standard story is intended as a guide in the usage of mechanical face seals for the engine coolant pump application. The main purpose of the document is to fill the void caused by the lack of a ready source of practical information on the design and use of the engine coolant pump face seal. Included in the document is a compilation of present practices, as in a description of the various types of seals, material combinations, design data, tolerances, drawing format, qualification and inspection information, and quality control data.