4BT Construction Dedicated 3.9L Turbo Diesel Engine Assembly with Mechanical Injection for Loaders and Excavators

The 4BT construction machinery version belongs to the mature B-series heavy-duty diesel engine platform, specifically optimized and reinforced for construction site conditions including continuous heavy-load operation, high-dust environments, and frequent start-stop cycles.

Key features include:

• Thick reinforced cast iron cylinder block
• Forged crankshaft for enhanced durability
• Mechanical VE distribution injection pump without electronic sensors
• Matched fixed geometry turbocharger
• Exclusive hydraulic PTO power take-off interface for external hydraulic pump drive
• Oversized industrial cooling fan assembly
• Reinforced mounting brackets and large flywheel housing for construction machinery transmission connection

Available in three factory-calibrated power grades for different construction equipment applications:

• 4BT3.9-C100 (100HP): Low power configuration ideal for small forklifts, water pump units, and small generators
• 4BTA3.9-C125 (125HP): Medium power configuration, mainstream match for 3-ton wheel loaders, road rollers, and small excavators
• 4BTA3.9-C150 (150HP): High power configuration designed for rotary drilling rigs, concrete mixers, and heavy-duty industrial equipment

Replacement fit for construction machinery & industrial power unit chassis compatible with 4BT construction dedicated powerplant. Reference production year range: 1998–2020

• 3-ton wheel loader, single drum road roller, small 4–6 ton mini excavator chassis
• Rotary drilling rig, pile driver, asphalt paver, concrete mixer chassis

• Heavy-duty forklift, mobile welding machine, water pump irrigation unit chassis
• 50–100kW stationary silent generator set chassis

If you need other engine assemblies, bare engine blocks, gearboxes, or other auto spare parts, you are welcome to search on our website or contact us directly.

We carry a full series of Japanese and American gasoline & diesel engines, covering trucks, passenger cars, household vehicles, and excavator construction machinery.