Cummins 4B3.9 Industrial Engine

The Cummins 4B3.9 Industrial Engine is a proven and highly reliable 4-cylinder diesel engine from the renowned B-Series lineup, engineered for demanding industrial, agricultural, and construction applications. With a displacement of 3.9 liters, this engine delivers exceptional torque, durability, and fuel efficiency, making it a trusted power solution worldwide.

Built with a rugged cast-iron block and head, the Cummins 4B3.9 is designed for long service life under continuous heavy-duty operation. Its direct fuel injection system ensures efficient combustion, improved fuel economy, and dependable cold starting performance. Available in naturally aspirated and turbocharged configurations, the engine can be tailored to meet various power requirements across different industries.

The compact and service-friendly design allows easy installation and maintenance, reducing downtime and operational costs. Its mechanical fuel system provides simple, reliable operation even in remote or harsh environments where electronic systems may be less practical. The engine is commonly used in generator sets, water pumps, compressors, forklifts, skid steer loaders, agricultural machinery, and other industrial equipment.

Known for its strong low-end torque and stable power delivery, the Cummins 4B3.9 ensures consistent performance under variable load conditions. Its robust cooling and lubrication systems further enhance durability, ensuring long operational life even in high-temperature or dusty environments.

Whether for stationary power generation or mobile industrial equipment, the Cummins 4B3.9 Industrial Engine remains a dependable and cost-effective diesel power solution trusted by operators worldwide.

Technical Specifications

General Specifications

• Engine Model: Cummins 4B3.9

• Engine Type: 4-Stroke, In-Line 4-Cylinder Diesel

• Displacement: 3.9 Liters (3,900 cc)

• Aspiration: Naturally Aspirated / Turbocharged (depending on configuration)

• Bore x Stroke: 102 mm x 120 mm

• Compression Ratio: Approx. 17.3:1

Performance

• Rated Power Output: 60 – 110 HP (45 – 82 kW) depending on application

• Rated Speed: 1,800 – 2,500 RPM

• Peak Torque: Approx. 230 – 420 Nm (varies by rating)

• Fuel System: Direct Injection (Mechanical)

Engine Systems

• Cooling System: Liquid-Cooled

• Starting System: 12V or 24V Electric Start

• Lubrication System: Pressure Lubricated

• Rotation: Counterclockwise (viewed from flywheel end)

Physical Specifications

• Configuration: Inline 4

• Dry Weight: Approx. 310 – 340 kg (varies by build)

• Mounting: Industrial power unit configuration

Applications

• Generator Sets

• Water Pumps

• Air Compressors

• Construction Equipment

• Agricultural Machinery

• Industrial Power Units