Cummins 4975274 Engine Heater Assembly

The Cummins 4975274 is an OEM electric engine block heater designed to preheat engine coolant and critical components for reliable cold weather starting. It reduces starter motor load and accelerates engine warm-up in low-temperature environments. This immersion-type heater installs directly into the engine block coolant passage. Compatible with Cummins B-series (4B, 6B, 6C), K-series (K19, K38, K50), NT855, M11, ISZ, QSX, and QSZ diesel engine families used across heavy-duty trucks, construction machinery, and industrial applications. Supersedes part number 3099666. Cross-reference includes C4975274.