A9042000822
Viscous Clutch / Fan Drive for OM904 Euro 4/5
Detroit Diesel

This viscous clutch or fan drive unit for OM904 Euro 4/5 engines is engineered to provide variable cooling based on engine temperature. With a flange diameter of 3.23 inches, flange thickness of 0.28 inches, and a bolt circle diameter of 3.24 inches, it attaches securely to the radiator and fan assembly. The four-stud configuration ensures stable engagement, allowing the clutch to modulate fan speed according to engine heat load. This design reduces unnecessary fan speed, thereby saving energy and reducing noise, while still providing sufficient airflow when needed. The viscous element responds dynamically to temperature changes, optimizing cooling performance and engine efficiency. For dependable cooling solutions, Source One Parts Center supplies high-quality, OEM-compatible viscous clutches to keep your engine operating at a safe temperature range.