Ribbed Fan Belt - Cummins
Manufactured to OEM specifications, this ribbed belt is engineered for durability, flexibility, and consistent power transmission under demanding operating conditions.
Cummins Ribbed Fan Belt - OEM Number: 3972378
Part No.
HEN1974
The Cummins Ribbed Fan Belt (OEM 3972378) is a direct replacement auxiliary drive component designed for use on a range of Cummins diesel engines. It transfers rotational power from the crankshaft to essential engine ancillaries such as the cooling fan, alternator, and water pump, ensuring reliable operation of critical support systems.
Manufactured to OEM specifications, this ribbed belt is engineered for durability, flexibility, and consistent power transmission under demanding operating conditions. Its multi-rib profile provides improved grip, reduced slip, and efficient load distribution across pulleys during continuous operation.
FUNCTION AND OPERATION
- Transfers drive power from the crankshaft to engine ancillaries
- Operates cooling fan, alternator, and water pump (application dependent)
- Maintains efficient operation of auxiliary engine systems
- Designed for high-load and continuous-duty applications
- Ribbed profile improves grip and reduces belt slip under load
TECHNICAL DETAILS
- OEM Part Number: 3972378
- Type: Ribbed auxiliary drive / fan belt
- Length: 224 cm
- Width: 28.5 mm
- Function: Power transmission for engine ancillaries
- Application: Engine front-end accessory drive system
- Construction: Reinforced EPDM rubber with high-strength tensile cords
- Profile: Multi-rib V-belt design for enhanced pulley engagement and flexibility
Some aftermarket references identify this belt as an 8PK2255 ribbed belt configuration used on selected Cummins applications.
TYPICAL APPLICATIONS
Suitable for a range of Cummins engine applications, including:
- Cummins 4B3.9 diesel engines
- Cummins 6B5.9 and ISB series engines
- Industrial and construction machinery
- Agricultural equipment
- Generators and stationary power units
Several suppliers reference OEM 3972378 for use on Cummins 4B3.9, 6B5.9, ISB, and ISB3.9 engine platforms.
IMPORTANT INFORMATION
Always confirm the correct OEM part number and engine model before ordering, as ribbed belt length, rib count, and pulley configuration may vary depending on engine specification and accessory layout. Incorrect belt alignment or tension can lead to premature wear, noise, or accessory drive failure.
| Pack quantity | 1 |
| Weight | 0.28 |
| OEM Number | 3972378 |
| Manufacturer | Cummins |
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