Cummins 4BTA3.9-C120 Diesel Engine 120HP Construction Engine
Cummins 4BTA3.9-C120 4-cylinder in-line diesel engine rated 90 kW (120 HP) at 2400 rpm with 3.9L displacement for excavators, wheel loaders, cranes, drill rigs and other off-highway machines.
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What This Engine Is Built For
The Cummins 4BTA3.9-C120 is a 4-cylinder in-line construction diesel engine of 3.9L with a 102 * 120 mm bore and stroke supplied by MEP Power as a complete assembly. It is rated at 90 kW (120 HP) at 2400 rpm and develops 480 N.m @ 1500 rpm. The engine is turbocharged-intercooled and water cooled, with a Direct Injection Pump fuel system. It is built at the Dongfeng Cummins Plant 4BTA3.9-C120 and carries Euro I. Typical duty is excavators, wheel loaders, cranes, drill rigs and other off-highway machines; dry weight with flywheel and alternator is 338 Kg and the overall envelope is 867mm*544mm*988mm.
Key Benefits
- Delivers 90 kW (120 HP) at 2400 rpm from 3.9L as a factory-rated assembly.
- Peak torque of 480 N.m @ 1500 rpm holds the load without downshifting or derating.
- Turbocharged-Intercooled induction with water cooling keeps charge temperature under control in continuous duty.
- Supplied to Euro I, so the unit can be registered in markets that require it.
- Dry weight 338 Kg and envelope 867mm*544mm*988mm are published so the installation can be checked before ordering.
- Rated for continuous running up to 2000 m 4BTA3.9-C120 altitude.
Application Scenarios
- 20-35 t excavator power unit replacement
- Wheel loader and grader repower
- Crawler crane and drill rig drive
- Concrete pump and batching plant drive
Who It Is For
- Excavator and loader rebuilders replacing a failed power unit
- Plant hire fleets that need machines back on rent quickly
- OEM machine builders sourcing a proven engine for a new chassis
- Quarry and earthmoving contractors running machines in dusty, high-load duty
Problems It Solves
- A machine down in the middle of a job stops the whole site, not just one asset.
- Rebuilt short blocks of unknown history fail again inside the warranty window.
- Dust, vibration and long hours at high load expose any weakness in the power unit.
- Identifying the right 4BTA3.9-C120 variant from a serial number takes experience; MEP Power checks the configuration before quoting.
Specification As Published
Values below are the published data for this unit. Where a figure is not listed it was not stated by the source data sheet; ask and we will confirm before you order.
| Model | 4BTA3.9-C120 |
| Type | 4 Cylinders in Line |
| Displacement | 3.9L |
| Bore x Stroke | 102 * 120 |
| Engine Configuration Number | D382043CX02 |
| Net Weight (with flywheel and alternator) | 338 Kg |
| Overall Dimension | 867mm*544mm*988mm |
| Manufacturing Plant | Dongfeng Cummins Plant 4BTA3.9-C120 |
| Rated Power/Speed | 90 kW/120HP |
| Rated Speed | 2400 rpm |
| Max Torque/Speed | 480 N.m @ 1500 rpm |
| Fuel Consumption at Rated Power | 210g/Kw.h |
| Max Continuous Running Altitude | 2000 m 4BTA3.9-C120 |
| Certification | Euro I |
| Aspiration | Turbocharged-Intercooled |
| Fuel System | Direct Injection Pump |
| Compression Ratio | 17.3:1 |
| Electrical System (starter motor/alternator) | 12V/24V |
| Lowest Starting Temp (without auxiliary system) | -12℃ |
| Engine Cooling Fluid Volume | 8.3 L |
| Cooling Method | Water Cooled |
Technical Features
- Cylinders: 4 Cylinders in Line
- Displacement: 3.9L
- Bore and stroke: 102 * 120
- Aspiration: Turbocharged-Intercooled
- Fuel system: Direct Injection Pump
- Electrical system: 12V/24V
- Compression ratio: 17.3:1
- Coolant capacity: 8.3 L
Quality Control
- Every engine is inspected by the MEP Power inspection team before it leaves the warehouse
- Engine, configuration and serial numbers are recorded and photographed for the buyer
- Genuine and OEM units are quoted separately so the buyer knows exactly what is supplied
- Warranty on genuine and OEM new engines and generator sets is one year or 1000 hours, whichever comes first; parts and repair labour are covered for quality faults inside that period.
Use and Installation Guide
- Quote the model 4BTA3.9-C120 and the engine configuration number D382043CX02 when ordering so the correct variant is supplied.
- Confirm flywheel housing, SAE size and pump drive against the machine
- Transfer the machine's own wiring harness only after checking the connector layout
- Run the first 50 hours at moderate load before full-duty work
- Keep the warranty terms in mind: one year or 1000 hours, whichever comes first.
Customisation Options
- OEM and ODM builds, including your logo and company name on the unit
- Cummins engine customisation and modification to your requirement
- Mining and special explosion-proof builds
- Genuine or OEM parts specified on the quotation
How It Compares
| Compared with | What to consider |
|---|---|
| A rebuilt or used engine of the same rating | A rebuilt unit may show the same 90 kW (120 HP) on paper, but its running history is unknown and the warranty rarely covers the whole engine. |
| A larger engine in the same 4BTA3.9 range | Moving up a frame size adds weight, envelope and fuel burn; specify the next size up only if the duty cycle really needs the headroom. |
| A non-Cummins engine of similar output | Parts and service for Cummins families are available in most markets, which matters more over ten years than the purchase price on day one. |
4BTA3.9-C120 Questions
Is this 4BTA3.9-C120 a genuine Cummins engine
What power does the 4BTA3.9-C120 produce
What warranty comes with the engine
How do I confirm this is the right variant for my machine
How is the engine shipped and what payment terms apply
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View specificationQuote The 4BTA3.9-C120
Send your serial number or nameplate photograph and we will confirm the configuration, then price genuine and OEM options side by side.