Product Description

The Cummins 4BT3.9-G2 Generator Drive Engine is a compact and fuel-efficient diesel engine for generator sets, designed to deliver reliable power generation for light commercial, industrial, and residential backup needs. With a 3.9-liter displacement, inline 4-cylinder configuration, and turbocharged aspiration, it provides dependable output from 36 to 44 kW at either 1500 or 1800 rpm.

Manufactured by Dongfeng Cummins Engine Co., Ltd., this genuine Cummins generator engine combines low fuel consumption, proven reliability, and simple maintenance, making it an excellent choice for small-scale generator sets.

Specifications

• Engine Model: Cummins 4BT3.9-G2
• Typee: 4-cycle, inline 4-cylinder
• Aspiration: Turbocharged
• Displacement: 3.9 liters
• Bore × Stroke: 102 × 120 mm
• Compression Ratio: 18.0:1
• Rated Speeds: 1500 rpm and 1800 rpm

• Power Output:

  • Prime: 36 kW (48 HP) @1500 rpm, 40 kW (54 HP)@1800 rpm

  • Standby: 40 kW ( 54 HP) @1500 rpm, 44 kW (59 HP)@1800 rpm

• Fuel System: BYC A/Electronic Governor
• Fuel Consumption: 9.3–10.3 L/h @1500 rpm; 10.7–11.7 L/h @1800 rpm

• Weight: Approx. 321 kg (wet)

Product Advantages

• Compact 4-cylinder design, ideal for small generator sets.
• Reliable power output up to 44 kW standby rating.
• Low fuel consumption for economical operation.
• Turbocharged performance with proven Cummins durability.
• Easy maintenance with global access to genuine Cummins generator engine parts.

• Dual-speed operation for both 50Hz and 60Hz power generation.

Key Features

• Lightweight, efficient 3.9L inline 4-cylinder engine.
• Turbocharged aspiration for improved performance.
• Direct injection fuel system with electronic governor.
• Reliable 12V/24V starting and charging systems.

• Built to meet GB 20891-2007 emission standards.

Applications

The Cummins 4BT3.9-G2 Generator Drive Engine is suited for:

• Small generator sets for residential and commercial buildings.
• Light industrial backup power for workshops and warehouses.
• Emergency standby power for offices and retail facilities.
• Mobile power units for construction sites.

• Remote and off-grid power generation.

Product Availability

The Cummins 4BT3.9-G2 Generator Drive Engine is available worldwide through Cummins’ authorized distributors, with full technical support, after-sales service, and access to genuine Cummins generator engine parts to ensure long-term, reliable power generation.