Cummins QSC8.3 CM850 Engine Introduction Cummins QSC8.3 CM850 engines are designed to meet the Environmental Protection Agency (EPA) Tier III levels. QSC8.3 CM850 engines installed with CM850 ECM (Electronic control module). This subject includes details of QSC8.3 CM850 engine powers and CPLs. INSITE™ electronic service tool Version 6.3, or later, is required for the QSC8.3 and […]