R2.8 CM2220 R101B Cummins® Service Engine Model Identification (2017) Section E - Engine and System Identification Page E-7 The identifier after the control system is a letter and number combination to identify variations between products. The letter is the engine platform designation. The number increments as new variations of the engine are released. The first number is 101. The letter at the end of the suffix identifies the general application for which the product is intended to be used. B – Automotive C – Industrial G – Power Generation/Generator Drive M – Marine To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com