Cummins® Service Engine Model Identification (2017) R2.8 CM2220 R101B Page E-6 Section E - Engine and System Identification The Cummins® Service Model Name begins with the marketing engine model name. The first two letters of the marketing model may still contain an “IS” or “QS” if the engine is an electronic engine. “IS” prefix designates an on-highway engine. “QS” prefix designates an off-highway engine. The first letter is the engine platform/series designation followed by the engine liter displacement. For the example shown in the graphic, the engine is a: B Series engine. 6.7 Liters in Displacement.
If no letter is located after the engine liter displacement information, the engine is fueled by diesel. If the letter “N” is located after the engine liter displacement information, the engine is fueled by natural gas. The engine control system is identified with the letters "CM" followed by the control system model number. To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com