Cummins 6CT Cylinder Block 4089241 3939313 | Heavy-Duty Diesel Engine Long Block Assembly

Product Details

Product Overview

This high-quality Cummins 6CT Cylinder Block (OEM Part Numbers: 4089241, 3939313) is a direct replacement for the popular 6CT series diesel engines. Manufactured to strict OE specifications, this engine block provides the robust foundation required for heavy-duty applications in construction, mining, agriculture, and industrial equipment. We offer global shipping to major markets including North America, Europe, Southeast Asia, the Middle East, and Africa, ensuring fast delivery to ports and industrial centers worldwide.

Key Features & Benefits

• Superior Durability: Cast from high-grade alloy iron for exceptional strength and resistance to thermal stress and wear.
• Precision Engineering: Machined to exact OEM tolerances (4089241 / 3939313) ensuring perfect fitment and reliable oil/coolant sealing.
• Enhanced Performance: Designed to handle the high compression and power output of the 6CT engine, supporting turbocharged and aftercooled configurations.
• Corrosion Resistance: Treated with protective coatings to prevent rust and pitting during storage and operation in harsh environments.
• Cost-Effective Solution: A reliable aftermarket alternative to expensive OEM parts, without compromising on quality or service life.

Technical Specifications

OEM Cross-Reference

This cylinder block is a direct replacement for the following genuine Cummins part numbers:

• 4089241 (Primary OEM Number)
• 3939313 (Alternative OEM Number)
• 4089240 (Superceded/Alternative Number)
• 3939312 (Superceded/Alternative Number)

Note: Always verify your existing block casting number to ensure compatibility.

Compatibility

This block is designed for the Cummins 6CT (6C8.3) engine series. Common applications include:

• Construction: Komatsu PC300, PC400 excavators; Case 921, 921C wheel loaders.
• Industrial: Cummins powered generator sets, air compressors, and pumps.
• Marine: Various workboat and auxiliary power applications.
• Off-Highway Trucks: Specific models from Terex, Euclid, and others utilizing the 6CT engine.

Years of Manufacture: Typically 1990s-2010s. Please confirm specific year and engine serial number for precise fitment.

Global Supply & Distribution

• Worldwide Shipping: We ship to all major continents including North America, South America, Europe, Asia-Pacific, the Middle East, and Africa.
• Fast Delivery: Stock items are dispatched within 24-48 hours to major ports (Shanghai, Singapore, Rotterdam, Houston, Dubai) and airports.
• Major Markets Served: USA, Canada, Germany, Australia, UAE, Saudi Arabia, South Africa, Chile, and Indonesia.
• Export Experience: We handle all international trade documentation (Bill of Lading, Commercial Invoice, Packing List, Certificate of Origin) and can assist with customs clearance.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001:2015 certified facilities under strict quality control processes.
• Testing: Each block undergoes dimensional inspection using CMM (Coordinate Measuring Machine) and pressure testing for water and oil galleries.
• Warranty: Backed by a standard 12-month warranty against manufacturing defects. Extended warranty options are available on request.
• Certification: Material test certificates (MTC) are available upon request for quality verification.

FAQ

Q: Will this cylinder block fit my Cummins 6CT engine in a Komatsu PC300-7?
A: This block (4089241/3939313) is a standard fit for the 6CT engine used in many Komatsu PC300 models, including the -7 and -8 series. However, we strongly recommend checking your current block’s casting number (located on the side of the block) and your engine’s serial number to confirm 100% compatibility, as there may be minor variations in machining for different chassis models.

Q: Does this block come with main bearing caps, liners, and cylinder head bolts?
A: This listing is for the cylinder block casting only. Main bearing caps are typically included, but we recommend confirming with our sales team. Liners, pistons, head bolts, and other components are sold separately. We can supply a complete engine overhaul kit if needed.

Q: What is the recommended maintenance after installing a new cylinder block?
A: After installation, it is critical to follow the factory break-in procedure. This includes a low-load run-in period for the first 50 hours, followed by an immediate oil and filter change. Torque all head bolts and main bearing cap bolts to the exact specifications in the Cummins service manual. Regular oil analysis is recommended for the first 250 hours to monitor for any abnormal wear metals.