Searching for a 3.9L Cummins block? This 4BT casting (OEM 3903920) fits Case 580K backhoes and skid steers. It resolves cylinder wear issues. Request a quote!
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The Cummins 4BT cylinder block (OEM: 3903920) is a reinforced cast iron unit designed for the high-vibration 3.9L engine environment.
It prevents structural cracking and fits equipment including Case 580K backhoes and various skid steers.
In stock for global export.
Our commitment to precision engineering guarantees that every block provides a perfect fit for all associated components, whether you are rebuilding a Case 580K backhoe or a marine generator. By choosing this cylinder block, you are investing in a component that upholds the reliability standards required for heavy-duty diesel power.
| Specification | Value |
|---|---|
| Product Type | Cylinder Block (Bare) |
| Engine Model | Cummins 4BT / 4BTA |
| Displacement | 3.9 Liters (4 Cylinder) |
| Material | High-Grade Cast Iron |
| Bore Size | 102.00 mm |
| Liner Type | Parent Bore (Sleeveless) |
| Machining Precision | CNC Machined |
| OEM Reference | 3903920, 3901204, 3916254 |
| Cross Reference | 3.9L Bare Block, 4BT Engine Casing |
| Typical Applications | Case 580K, Skid Steers, Marine |
| Application Category | Construction / Industrial / Swap |
| Engine Model | Application Field | Typical Equipment Brands & Models |
|---|---|---|
| Cummins 4BT (3.9L) | Construction | Case 580K/580 Super K Backhoes, Skid Steer Loaders, Vibratory Rollers |
| Cummins 4BTA (3.9L) | Automotive / Industrial | Step Vans (Bread Trucks), Generators, Industrial Pumps |
| Marine 4BT | Marine | Work Boats, Auxiliary Power Units |
Ruich Value supplies a dedicated range of Cummins cylinder blocks, including new aftermarket and remanufactured replacements. Our coverage includes popular engine families such as the 6BT/6BTA, 4BT, ISB, ISX, and NT855 series. For a complete catalog of our Cummins cylinder blocks, please contact our sales team.
| Model | Model | Model | Model |
|---|---|---|---|
| 4B/4BT | ISL/QSL9.3/6LT-9.3 | ISG | ISX/QSX15 |
| 6B/6BT/6D102 | QSC8.3 | ISLE | ISC |
| 6C/6CT (single thermostat) | X15 | K19 | ISDE4.5 |
| 6CT (double thermostat) | NT855 | ISF2.8 | ISDE6.7 |
| 6L/6LT | ISM11 | ISF3.8 | ISB6 E3 |
| ISB4.5 | ISB6.7 | QSB3.3 |
The 4BT engine is known for producing significant vibration compared to 6-cylinder models. The primary challenge is fatigue cracking near the motor mounts or bell housing. Our replacement 3903920 block addresses this by using high-density cast iron with reinforced webbing to withstand these harmonic vibrations.
Yes, this bare block is a direct replacement for the Cummins 4-390 engine found in the Case 580K backhoe loader. It matches the OEM mounting points and oil passages perfectly, ensuring a seamless rebuild process for construction equipment.
The cylinder bore is machined to a standard 102.00mm diameter (parent bore design). The deck height is machined to standard OEM specifications to maintain correct compression ratios. All blocks undergo pressure testing to guarantee the integrity of the water jackets and oil galleries before shipping.
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For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business