Study of basic physical principles, operation and construction of two- and four-stroke cycle engines. Ignition timing of four-stroke cycle engines to factory specifications. Basic diagnostic engine test procedures will be practiced on spark and compression ignition engines. This course also covers the types of internal combustion engine cooling systems, lubrication systems, air intake systems, and exhaust systems. This course also deals with the performance of Deere engines. Engine performance test equipment, procedures, results, and corrections will be covered. Safety is stressed.