Cummins 4BT/6BT/QSB/ISB

The 3907803 4BT crankshaft is high-strength forged steel bare crankshaft designed for Cummins 4BT and 4BTA3.9 four-cylinder 3.9-liter diesel engine. Cross Reference OE numbers：3907803, 3929036, 3908031, 3903827, 3960621

Following is the detail OEM parts number of Cummins crankshaft we are supply:

1. Premium forged steel blank, high tensile strength, excellent fatigue resistance, stable under frequent start-stop and medium load working conditions
2. Precision CNC grinding on main journals and rod journals, low surface roughness, reduces bearing abrasion and oil consumption
3. 100% dynamic balance calibration and magnetic particle crack detection before shipment, no hidden internal crack risk
4. Strictly follows Cummins OE dimensional standards, perfectly matches 4BT crank gear, main bearings, connecting rod bearings and piston assemblies
5. ISO‑9001 certified manufacturing, consistent quality for repair shops, spare‑part wholesalers and fleet maintenance
6. Widely used on light-duty trucks, small excavators, wheel loaders, agricultural machinery and 4BT stationary generator sets

Remarks:
1).The Crankshaft we produced are suitable for the following Cummins models:
Engine Series: A2300, B3.3, QSB3.3, 4BT3.9, 6BT5.9, 6CT8.3, L8.9, L9.3, ISBE, ISDE,  ISC8.3, ISL9, QSL9, ISM11, QSM11, L10,  NTA855, N14, KTA19, KTA38, KTA50, QSK45, QSK60, QST30, QSX15, ISX15, VTA28, NH220, ISF2.8, IS3.8, QSF3.8, ISG11, ISG12.
2).If your need item can’t find in this list, please contact with us directly to check more information.
There is many photos and parts number can’t full show in this website.
3). We slso can do OEM and ODM ,If you have other brand require, we also can offer .
4). For any future information need or question require, please contact us to know more.