3921557 4BT 6BT Oil Cooler Core | Komatsu 4D102 Engine Parts | 5 Plate Type Diesel Oil Cooler

Product Details

Product Overview

This high-quality 3921557 Oil Cooler Core is specifically designed for use with Cummins 4BT and 6BT diesel engines, commonly applied in Komatsu 4D102 series machinery. As a critical component of the engine’s lubrication and cooling system, this 5-plate type oil cooler ensures optimal heat dissipation to maintain stable oil temperatures during heavy-duty operation.

Manufactured to meet or exceed OEM specifications, this oil cooler core serves as a direct replacement for worn or failed units. While primarily identified for Cummins B-series engines, it is commonly used in various Komatsu construction equipment models that utilize the 4D102 engine platform. Please verify your existing part configuration before purchase to ensure compatibility.

As a 100% new component, this oil cooler core offers a cost-effective solution for engine overhauls and repairs, providing reliable performance in demanding working conditions across construction, mining, and industrial applications.

Key Features & Benefits

• Precision Fitment: Direct replacement for 3921557 applications on Cummins 4BT/6BT and Komatsu 4D102 engines, minimizing installation time and modification needs.
• 5-Plate Design: Optimized cooling surface area for efficient heat transfer, ensuring consistent oil temperatures and extended engine life under heavy loads.
• 100% New Construction: Manufactured from high-grade materials to ensure durability and resistance to thermal stress, corrosion, and vibration.
• OEM Specification: Engineered to match original equipment standards for pressure ratings, flow characteristics, and dimensional accuracy.
• Enhanced Engine Protection: Proper oil cooling reduces thermal breakdown of lubricant, maintaining viscosity and protecting critical engine components from wear.
• Versatile Application: Suitable for both 4BT and 6BT engine platforms as well as Komatsu 4D102 series, making it a flexible inventory item for workshops and parts distributors.
• Cost-Effective Solution: Provides reliable aftermarket performance at a competitive price point compared to genuine OEM parts.

Technical Specifications

OEM Cross-Reference

This oil cooler core is designed as a direct replacement for the following OEM and aftermarket part numbers:

• Primary OEM Number: 3921557
• Compatible With: Cummins 4BT/6BT engine cooling systems
• Komatsu Reference: Commonly used in Komatsu 4D102 engine applications

Note: This is an aftermarket replacement part. While engineered to OEM specifications, it is not manufactured by Cummins or Komatsu. Always verify compatibility with your specific engine serial number and existing cooler mounting configuration.

Compatibility

This 3921557 oil cooler core is commonly used for the following engine platforms and applications:

• Engine Models: Cummins 4BT 3.9L, Cummins 6BT 5.9L
• Application Equipment: Komatsu machinery utilizing the 4D102 engine series
• Vehicle Types: Industrial generators, construction equipment, agricultural machinery, and marine applications using B-series engines

Important: Compatibility is inferred based on the part number and engine model data. We strongly recommend comparing this part with your original unit for physical dimensions, mounting hole patterns, and inlet/outlet port configurations before installation.

Global Supply & Distribution

We offer worldwide shipping capabilities to support international B2B buyers in the heavy equipment and diesel engine parts industry. Our distribution network covers major markets across:

• North America: USA, Canada, Mexico – Fast delivery to ports such as Los Angeles, Houston, and Vancouver.
• Europe: Germany, UK, Netherlands, France – Regular shipments to Rotterdam, Hamburg, and Felixstowe.
• Asia-Pacific: Australia, Japan, South Korea, Southeast Asia – Efficient logistics to Sydney, Tokyo, and Singapore.
• Middle East & Africa: UAE, Saudi Arabia, South Africa – Reliable service to Dubai, Jeddah, and Durban.
• South America: Brazil, Chile, Argentina – Shipping to Santos, Valparaíso, and Buenos Aires.

Based in Shanghai, China, we leverage one of the world’s busiest ports to ensure competitive freight rates and rapid processing times. Our export team is experienced in international trade documentation, customs clearance, and compliance with import regulations in destination countries. Bulk orders and consolidated shipping options are available for volume buyers.

Quality Assurance

This oil cooler core is manufactured under strict quality control standards to ensure reliable performance in demanding diesel engine applications. Our quality assurance process includes:

• Material Verification: Raw materials are sourced from certified suppliers and inspected for composition and structural integrity.
• Dimensional Accuracy: Each unit is checked for critical dimensions including plate thickness, port sizes, and mounting hole alignment.
• Pressure Testing: Finished coolers undergo leak testing to verify seal integrity under operating pressure conditions.
• Visual Inspection: 100% visual inspection for surface defects, weld quality, and overall workmanship.
• Warranty Coverage: Backed by a 3-month warranty against manufacturing defects. After-warranty online support is available for technical inquiries.

Note: This product does not include a video outgoing inspection or machinery test report as standard. For large-volume orders, customized inspection protocols can be arranged upon request.

FAQ

Q1: Is this oil cooler core a direct replacement for the original Cummins part?

This aftermarket 3921557 oil cooler core is designed to match OEM specifications for the Cummins 4BT and 6BT engine platforms. However, due to possible engineering changes over different production years, we recommend comparing the physical dimensions (length, width, height, and port locations) of this unit with your existing cooler before installation. It is commonly used as a direct replacement, but verification is always the best practice for aftermarket parts.

Q2: What maintenance is required for this oil cooler core after installation?

After installation, ensure the cooling system is properly filled with the correct coolant mixture and that there are no air pockets in the system. During the first 50 hours of operation, check for any signs of oil leakage around the cooler connections. Regularly inspect the cooler for debris buildup on the exterior fins and clean as needed to maintain optimal heat transfer. It is also recommended to replace the oil filter and change the engine oil after installing a new oil cooler to remove any contaminants from the previous failed unit.

Q3: Can this 5-plate oil cooler be used on both 4BT and 6BT engines interchangeably?

Yes, this 3921557 oil cooler core is designed to fit both the 4BT (3.9L) and 6BT (5.9L) Cummins engine platforms. The 5-plate configuration provides adequate cooling capacity for both engine sizes under normal operating conditions. However, for heavily modified or high-horsepower 6BT applications, we recommend consulting with a diesel specialist to ensure sufficient cooling capacity. Always verify the mounting bracket configuration and hose connections match your specific engine setup.