Cummins 4B3.3 Power Unit

The Cummins 4B3.3 Power Unit is a highly durable and fuel-efficient 4-cylinder diesel engine designed for industrial, agricultural, construction, and stationary power applications. Built on Cummins’ proven B-Series platform, the 4B3.3 delivers reliable performance, strong torque output, and long service life in demanding operating environments.

Proven 3.3L Diesel Performance

The Cummins 4B3.3 features a 3.3-liter displacement, 4-cylinder inline configuration engineered for smooth power delivery and dependable operation. Its robust cast-iron block and heavy-duty internal components ensure durability under continuous-duty cycles.

Available in naturally aspirated and turbocharged configurations (depending on specification), the 4B3.3 provides flexible power output options suitable for various industrial requirements.

Reliable Industrial Power

Designed as a self-contained power unit, this engine is commonly supplied with radiator cooling, industrial flywheel housing, and standard SAE configurations, making integration into equipment straightforward and efficient.

It is widely used in:

• Construction equipment

• Agricultural machinery

• Pumps and irrigation systems

• Generator sets

• Industrial compressors

• Marine auxiliary conversions

Fuel Efficiency & Mechanical Simplicity

Equipped with a mechanical fuel injection system, the Cummins 4B3.3 offers reliable cold starting, consistent fuel delivery, and lower operating costs. Its mechanical design ensures ease of maintenance and field serviceability, even in remote job sites.

Compact & Versatile Design

The engine’s compact footprint allows installation in space-limited equipment while maintaining excellent service access. Its balanced design minimizes vibration and enhances operational stability.

Durability & Global Support

As part of the globally recognized Cummins B-Series family, the 4B3.3 benefits from:

• Worldwide parts availability

• Extensive service network

• Proven long-term reliability

• Strong resale value

Key Advantages

• 3.3L 4-cylinder industrial diesel engine

• Strong low-end torque for heavy-duty applications

• Fuel-efficient mechanical injection system

• Compact and easy-to-install power unit configuration

• Reliable performance in continuous-duty operations

• Backed by Cummins global support network

Technical Specifications

General Information

• Model: Cummins 4B3.3

• Engine Type: 4-stroke inline diesel engine

• Configuration: 4 cylinders, vertical inline

• Aspiration: Naturally aspirated or Turbocharged (depending on version)

• Application: Industrial / Power Unit

Displacement & Combustion

• Displacement: 3.3 liters (3,300 cc)

• Bore × Stroke: 95 mm × 115 mm

• Compression Ratio: Approx. 17.5:1 (turbo) / 18.5:1 (NA)

• Fuel System: Mechanical direct injection

• Combustion System: Direct injection diesel

Performance

• Rated Power Output: Approx. 60 – 85 HP (45 – 63 kW)

• Rated Speed: 2,200 – 2,800 RPM (application dependent)

• Peak Torque: Approx. 230 – 300 Nm (varies by rating)

• Torque Rise: Up to 25%

Cooling & Lubrication

• Cooling System: Liquid-cooled (radiator-equipped power unit)

• Water Pump: Belt-driven centrifugal type

• Lubrication System: Full-pressure lubrication

• Oil Capacity: Approx. 8 – 10 liters

Air & Exhaust

• Air Intake: Naturally aspirated or turbocharged

• Exhaust System: Dry industrial exhaust manifold

Electrical System

• Starting System: Electric start

• Voltage: 12V or 24V (depending on configuration)

• Alternator: Heavy-duty industrial alternator

Dimensions & Weight

• Dry Weight: 250 – 320 kg

• Overall Length: Approx. 850 – 950 mm

• Width: Approx. 600 – 650 mm

• Height: Approx. 800 – 900 mm

Mounting & Flywheel

• Flywheel Housing: SAE standard options

• Flywheel Size: SAE configurations available

• Mounting Type: Industrial base / skid mount option