Diesel Engine Parts 6BT Crankshaft Main Bearing 3940059 3945329 5298256 3901306 Con Rod Bearing for

Product Details

Product Overview

This premium set of Diesel Engine Parts includes both Crankshaft Main Bearings and Con Rod Bearings, specifically designed for the 6BT engine model. These components are critical for maintaining the precise clearance and oil film required for the rotating assembly in high-performance diesel engines.

Supplied under part numbers 3940059, 3945329, 5298256, and 3901306, these bearings are commonly used in heavy-duty applications such as excavators and trucks. Sourced from Japan, these genuine parts offer a direct replacement solution to restore engine performance and reliability.

Key Features & Benefits

• Precision Fitment: Machined to exact OEM specifications for the 6BT engine block and crankshaft, ensuring proper oil clearance and load distribution.
• Long-Lasting Durability: Constructed from high-grade materials to withstand extreme pressures and temperatures, reducing the risk of premature bearing failure.
• OEM Cross-Reference Compatibility: Direct replacement for multiple OEM numbers including 3940059, 3945329, 5298256, and 3901306, simplifying parts identification.
• Complete Bearing Set: Includes both main and con rod bearings, providing all necessary components for a comprehensive bottom-end rebuild.
• Genuine Quality Assurance: Sold as a genuine product, offering confidence in material integrity and dimensional accuracy over generic alternatives.
• Application Versatility: Suitable for both excavator and truck applications, making it a versatile stock item for heavy equipment workshops.

Technical Specifications

OEM Cross-Reference

This bearing set is a direct replacement for the following original equipment manufacturer (OEM) numbers. Please verify your existing part numbers for exact compatibility:

• 3940059 – Crankshaft Main Bearing (Standard)
• 3945329 – Connecting Rod Bearing (Standard)
• 5298256 – Main Bearing Set
• 3901306 – Connecting Rod Bearing Set

Note: These numbers correspond to standard size bearings. If your crankshaft has been ground, an undersize bearing (e.g., 0.25mm or 0.50mm) may be required.

Compatibility

This product is specifically designed for the Cummins 6BT engine platform. Due to the widespread use of this engine, these bearings are commonly used for:

• Excavators: Various models from manufactures like Komatsu, Hitachi, and Hyundai that utilize the 6BT power unit.
• Trucks: Medium-duty trucks and bus chassis that rely on the 6BT diesel engine for power.
• Industrial Equipment: Generators, compressors, and other industrial machinery powered by the 6BT.

Important: Always verify the engine model and existing bearing part numbers before ordering to ensure correct fitment.

Global Supply & Distribution

We offer worldwide shipping to support the global heavy equipment and automotive aftermarket. Our logistics network ensures fast and reliable delivery to major industrial centers and ports across all continents.

• North America: Ready stock for quick dispatch to the US, Canada, and Mexico.
• Europe: Efficient delivery to EU nations including Germany, the UK, France, and the Netherlands.
• Asia-Pacific: Direct shipping to Australia, New Zealand, Singapore, and Japan.
• Middle East & Africa: Serving markets in the UAE, Saudi Arabia, South Africa, and Nigeria.
• South America: Fast shipping to Brazil, Chile, and Argentina.

With extensive export experience, we handle all international trade documentation and compliance to ensure a smooth customs clearance process for our B2B clients.

Quality Assurance

We are committed to providing high-quality diesel engine components that meet the demands of professional workshops and fleet operators.

• Manufacturing Standards: Products are manufactured to meet or exceed OEM specifications for hardness, material composition, and dimensional accuracy.
• Warranty: This product comes with a 6-month warranty against manufacturing defects, providing peace of mind for your repair.
• Testing: Each batch undergoes rigorous quality control checks, including dimensional inspection and material verification.
• Post-Sale Support: Our team offers video technical support to assist with installation queries and troubleshooting after the warranty period.

FAQ

Q: How do I verify that these bearings are the correct size for my 6BT engine?
A: You must first check the condition of your crankshaft. If the crankshaft journals are standard size (not ground), this standard set (3940059/3945329) will fit. If the crankshaft has been previously ground, look for markings on the bearing shells or crankshaft counterweights indicating the undersize (e.g., 0.25mm or 0.50mm).

Q: What is the proper installation procedure for these main and con rod bearings?
A: Installation requires meticulous cleanliness. Apply a thin layer of clean engine oil to the bearing surfaces. Install the upper main bearings into the block and the lower main bearings into the main caps. For con rod bearings, ensure the locating tangs align with the grooves in the rod and cap. Always torque bolts to the manufacturer’s specifications using a calibrated torque wrench and follow the correct tightening sequence.

Q: What is the recommended maintenance after installing new bearings?
A: After installation, the engine must be primed with oil before starting to prevent dry start damage. We recommend an initial oil and filter change after the first 50 hours of operation to remove any fine wear particles from the break-in period. Use a high-quality diesel engine oil with the correct API rating and viscosity (typically 15W-40 for most 6BT applications).