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Cummins 5256139 Viscous Damper Assembly - Suitable for ISDe/ISB/QSB Series Diesel Engines
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| Product Type | Viscous Vibration Damper |
| Original Part Number | 5256139 |
| Interchange Part Number | 3977926 |
| Engine Brand Compatibility | Cummins |
| Compatible Engine Series | ISDe, ISB, QSB, ISBe, ISLe, Series B |
| Displacement | 4.5L, 6.7L |
| Emissions Standard | Tier 3 |
| Warranty Period | 12 months (varies for new and remanufactured parts from suppliers) |
| Working Mode | Viscous Damping Vibration Reduction |
| Function | Reduce crankshaft torsional vibration, protect engine components |
| Material | Steel Shell, internally filled with high viscosity silicone oil |
| Installation | At the front end of the engine crankshaft pulley |
OEM Part No.
5256139
Engine Part No.
ISDeISB6.7QSB6.7ISDe4.5ISLeNT855M11K19K38K50Renault DCi11ISF3.84B6B6C
Interchange No.
3977926
Fitment Vehicles
Heavy Duty TruckConstruction MachineryExcavatorLoaderAgricultural MachineryShipMining MachineryCoachGenerator Set
Fuel System - Industrial Encyclopedia
Original Cummins (Cummins) viscous damper (Part No.: 5256139), designed specifically for ISDe, ISB, QSB series electronic control diesel engines. This component uses precision viscous damping technology to effectively absorb and attenuate crankshaft torsional vibration, significantly reducing engine noise and mechanical wear during operation, ensuring the operating stability and durability of equipment such as heavy trucks, construction machinery, and generator sets under harsh conditions. Compatible with multiple Cummins platforms including ISDe4.5, ISB6.7, QSB6.7, it is a key reliability component for engine overhaul or maintenance.