Cummins 4BT3.9 engine for construction equipment

The Cummins 4BT3.9 series is a classic 4-cylinder diesel engine platform widely used in industrial and construction machinery. It is renowned for its simple design, high torque reserve, exceptional reliability, and ease of maintenance. A "bare engine assembly" typically comprises core components such as the cylinder block, cylinder head, crankshaft, connecting rods, pistons, camshaft, and valve cover, excluding peripheral accessories (e.g., alternator, starter motor, turbocharger, fan).

Engine Configuration: Inline-4, 4-stroke, 3.9-liter (239 cu in) displacement

Cooling System: Liquid-cooled

Rated Power: Approx. 60 – 112 kW (80 – 150 hp), depending on the specific rating (naturally aspirated or turbocharged versions)

Fuel System: Mechanical direct-injection pump (VE pump or P7100 pump, depending on the version; highly serviceable)

Approximate Dimensions:

Length: Approx. 750 mm – 800 mm

Width: Approx. 600 mm – 650 mm

Height: Approx. 800 mm – 850 mm

Weight (Bare Engine): Approx. 300 – 350 kg (varies slightly by configuration)

Key Advantages:

Exceptional Reliability: Features a streamlined mechanical design capable of stable operation in harsh environments characterized by high dust and high temperatures.

Abundant Spare Parts: Mature global supply chain for parts; low overhaul costs.

Stable Power Output: Excellent low-speed torque performance, making it ideal for powering construction machinery and pump sets.

Primary Applications: Mini-excavators, road rollers, forklifts, generator sets, agricultural tractors, and industrial pump stations.

Guangzhou Jianming Machinery Equipment Co., Ltd.

With 20 years of solid practical experience, we are experts in the field of mechanical power systems and components.

We began as a small machinery repair shop. Over the past two decades, we have accumulated extensive experience and a track record of successful projects worldwide. Drawing on extensive frontline experience in resolving complex mechanical issues, we have earned global acclaim and grown into a comprehensive enterprise employing over 200 professionals.

We possess a deep understanding of the challenges equipment faces under extreme conditions, backed by rich practical experience and expertise in the following areas:

**Heavy Machinery Power Upgrades and Retrofitting:** We provide customized engine replacement and overhaul solutions for various types of construction machinery, with specialized proficiency in major power platforms such as Cummins.

**Mining and Industrial Equipment Maintenance:** We offer professional power optimization strategies to ensure equipment maintains continuous operational capability under heavy-load conditions.

**Agricultural and Irrigation Power Systems:** We provide power unit upgrades and comprehensive troubleshooting services for a wide range of agricultural machinery and irrigation/drainage equipment.

Leveraging our extensive technical expertise, we are also a robust supplier of spare parts:

**Comprehensive Mechanical Parts Supply:** We offer a wide, carefully curated selection of heavy machinery parts—including fuel pumps, cylinder head assemblies, piston assemblies, engine overhaul kits, and precision-machined engine components—to fully meet your one-stop procurement needs.

Our wealth of practical experience and robust supply chain system are our most valuable assets. Whether you are facing complex mechanical challenges or require reliable spare parts, Jianming Machinery possesses the expertise to help you succeed!