Engine Identification C Series Page E-2 Section E - Engine and System Identification 2 Control Parts List 3 Model 4 Horsepower and rpm rating. Marine Applications Use the information from the engine dataplate when discussing service or the source of parts for your engine. NOTE: This marine diesel engine conforms to the NOx requirements of the International Maritime Organization (IMO), MARPOL 73/78, Annex VI, Regulation 3 as applicable.