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High-quality aftermarket Cummins 4BT 3.9L cylinder block from Ruich Value, showcasing the precision-machined deck surface and side mounting points. Part number reference: 3903920.
Top deck view of a Ruich Value aftermarket Cummins 4BT cylinder block, highlighting the four clean, precision-honed cylinder bores and head bolt pattern. A quality replacement for OEM part 3903920
Cummins 4BT Cylinder Block | OEM 3903920 | Ruich Value - Image 3
Side view of a Ruich Value aftermarket Cummins 4BT cylinder block, showing the mounting surfaces for the oil filter head and fuel lift pump. A heavy-duty replacement block for 3.9L engine rebuilds.
Rear view of the Ruich Value aftermarket Cummins 4BT cylinder block, highlighting the precision-machined flywheel housing mounting surface and rear main seal bore for a leak-free fit.

Cummins 4BT Cylinder Block | OEM 3903920 | Ruich Value

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Cummins 4BT Cylinder Block

Overview:
The Ruich Value replacement Cummins 4BT cylinder block is the cornerstone for rebuilding or repairing the iconic 3.9L diesel engine. Manufactured with precision engineering, this engine block serves as a robust foundation, ensuring the durability and performance that Cummins is known for. As a direct aftermarket alternative to OEM part 3903920, it guarantees a perfect fit for 4B, 4BT, and 4BTA models, restoring your equipment to its original operational strength.

Drawing on Cummins’ rich heritage of producing powerful and dependable engines, our cylinder blocks are built from high-grade cast iron to withstand extreme pressures and temperatures. This focus on material quality and manufacturing excellence ensures long-term reliability, making it the ideal choice for fleet maintenance managers and rebuilders seeking a cost-effective solution without compromising on quality. Trust Ruich Value for your Cummins industrial engine parts wholesale needs.

Specifications & Features

OEM Numbers 3903920 (Primary), 4991816, 3932011, 3935936, 4093818 (Typical Reference)
Engine Model Compatibility Cummins 4B, 4BT, 4BTA (3.9L Series)
Material High-Grade Cast Iron
Weight (Bare) Approx. 90 kg
Bore x Stroke 102 mm x 120 mm
Cylinder Count 4
Key Features
  • • Heavy-duty cast-iron construction for maximum durability.
  • • Parent bore design with a stiff crankcase for enhanced strength.
  • • Precision-machined to meet or exceed OEM specifications for fitment and performance.

Compatible Engine Models and Applications

Engine Model Application Field Typical Equipment Brands & Models
4BT / 4BTA 3.9 Construction & Industrial Case (Skid Steers), Bobcat (Loaders),

Vermeer (Chippers),

Ingersoll Rand (Rollers),

Various Generators
4BT 3.9 Automotive & Light Commercial Step Vans (e.g.,

Frito-Lay trucks),

Delivery Trucks,

Engine Swaps (Jeep, Ford, Land Rover)
4BT Marine Marine Propulsion Small to Medium-Sized Workboats,

Fishing Trawlers,

Pleasure Craft
4BTAA Agriculture Tractors,

Combine Harvesters,

Irrigation Pumps

Why Choose Ruich Value?

  • Unmatched Durability: Built with robust materials to honor Cummins’ heritage of reliability, ensuring a long service life.
  • Guaranteed Performance: Our Cummins 4BT cylinder block is precision-engineered to restore original power and efficiency.
  • Strategic Sourcing Partner: We offer competitive wholesale pricing, helping distributors and fleets reduce operational costs.
  • Comprehensive Quality Control: Every block undergoes rigorous inspection to ensure it meets strict dimensional and material standards.
  • Extensive Application Coverage: The ideal 4bt engine block for sale, covering construction, automotive, and marine applications.
  • Expert B2B Support: Our technical team provides professional support for all Cummins industrial engine parts wholesale inquiries.

Cummins Cylinder Block Range

Ruich Value supplies a dedicated range of Cummins cylinder blocks, including new aftermarket replacements for various applications. Our catalog includes blocks for the most common Cummins engine families, ensuring wide coverage. We stock high-demand items like the Cummins 4BT cylinder block and 6BT models.

Category Coverage: 4BT/4BTA, 6BT/6BTA, ISB/QSB, ISF, KTA Series.

For a complete list of available models, please contact us or refer to our catalog:

ModelModelModelModel
4B/4BTISL/QSL9.3/6LT-9.3ISGISX/QSX15
6B/6BT/6D102QSC8.3ISLEISC
6C/6CT
(single thermostat)
X15K19ISDE4.5
6CT
(double thermostat)		NT855ISF2.8ISDE6.7
6L/6LTISM11ISF3.8ISB6 E3
ISB4.5ISB6.7QSB3.3

Contact Us for More Details

For pricing, availability, and technical questions about the Cummins 4BT cylinder block, please contact our sales team.

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