QSB4.5 and QSB6.7 Engine Identification Section E - Engine and System Identification Page E-1 Engine Identification Engine Dataplate The engine dataplate provides important information about the engine. The engine serial number (ESN) and control part list (CPL) provide information for service and for ordering parts. The engine dataplate must not be changed unless approved by Cummins Inc. Have the following engine data available when communicating with a Cummins® Authorized Repair Location. The information on the dataplate is mandatory when sourcing service parts.