Cummins 431682800 Crankshaft Assembly
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| OEM Number | 3929041 |
|---|---|
| Engine Application | Cummins 6CT / ISC / QSC 8.3L |
| Number of Cylinders | Inline 6-Cylinder |
| Stroke | 124 mm (4.88 in) |
| Crankshaft Main Journal Diameter | 83 mm (3.268 in) |
| Rod Journal Diameter | 64 mm (2.52 in) |
| Material | Forged Alloy Steel (Induction Hardened) |
| Balance Process | Dynamic Balanced to OEM Spec |
| Mount Type | Integral Flange |
| Seal Type | Single Lip / Unitized |
| Rear Seal Plate Number | Unitized Seal Assembly |
| Net Weight | 62.5 kg |
| Package Dimensions | 95 × 40 × 35 cm |
Manufacturer No.
- 431682800
- 3929041
- 3976021
OEM Part No.
- 431682800
Engine Part No.
- Cummins 6CT 8.3L
- Cummins ISC 8.3L
- Cummins QSC 8.3L
- Dongfeng Cummins 6CT 8.3L
Interchange No.
- C-431682800
- MCB431682800
- A-431682800
- CRK-431682800
Fitment Vehicles
- Dongfeng Tianjin Series
- Dongfeng Tianlong Series
- Dongfeng Commercial Vehicles (6CT Powered)
- Komatsu PC200-6/7/8 (6CT Engine)
- Shantui SD16/SD22 (6CT Engine)
- Various Industrial Generator Sets (6CT/ISC/QSC)
The Cummins 431682800 crankshaft is a precision-forged steel component designed for the 6-cylinder 8.3-liter B-series engine platform, including 6CT, ISC, and QSC variants.
It features induction-hardened main and rod journals for wear resistance and fatigue strength. The crankshaft undergoes dynamic balancing to OEM specifications to ensure smooth operation at rated speeds up to 2600 RPM. It integrates the timing gear mounting flange and front/rear seal surfaces. This assembly replaces the OEM forging number 3929041 and is a direct fit for Dongfeng Cummins engine builds utilized in heavy-duty commercial vehicles and construction machinery.
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