Cummins 6BT Main & Connecting Rod Bearing Set 0.50mm Oversize 3939861

Product Details

Product Overview

This is a premium quality main bearing and connecting rod bearing set, specifically manufactured for the Cummins 6BT diesel engine. Featuring a 0.50mm (0.020″) oversize specification (part number 3939861), this bearing set is designed for engine rebuilds requiring a reground crankshaft. Sourced from high-quality materials to ensure a precise fit and long service life, this kit is ideal for heavy-duty applications including trucks, industrial equipment, and marine vessels. We ship globally to major industrial centers in North America, Europe, Southeast Asia, the Middle East, and South America.

Key Features & Benefits

• Precision Oversize Fit: Manufactured to a precise 0.50mm oversize standard, ensuring correct oil clearance and optimal crankshaft support after a regrind.
• Superior Material Composition: Constructed from a tri-metal or bi-metal high-strength steel backing with a lead-copper-tin overlay for excellent fatigue resistance and conformability.
• Enhanced Durability: Designed to withstand the high cylinder pressures and thermal loads of the turbocharged 6BT engine, reducing the risk of bearing spin or seizure.
• Cost-Effective Rebuild Solution: Provides a reliable and affordable alternative to OEM components without compromising on performance or longevity.
• Complete Set: Includes all necessary upper and lower shells for both main and connecting rod positions, simplifying the ordering process.

Technical Specifications

OEM Cross-Reference

This bearing set is a direct replacement for the following original equipment manufacturer (OEM) numbers:

• Main Bearing: 3939861
• Rod Bearing: 3939861 (Rod bearings often share the same part number prefix in this kit)
• Alternative Numbers: 3914810, 3914813, 3914814 (May be superseded or alternative listings for standard size; verify 0.50mm spec)

Note: Always cross-reference your existing bearing part number to ensure correct size and application.

Compatibility

This bearing set is designed for the following applications:

• Engine: Cummins 6BT (5.9L) 6-cylinder diesel engine.
• Vehicle Applications: Dodge Ram 2500/3500 (1989-2002), Ford Econoline (with Cummins conversion), various agricultural tractors (Case IH, New Holland), industrial compressors, and generator sets.
• Specification: Specifically for engines where the crankshaft has been reground to 0.50mm undersize. Not for standard or 0.25mm applications.

Global Supply & Distribution

We are a leading supplier of heavy-duty engine components with a robust global logistics network. Our services include:

• Worldwide Shipping: Reliable delivery via DHL, FedEx, UPS, and sea freight to major ports worldwide.
• Major Markets: Serving North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands), Asia-Pacific (Australia, Singapore, UAE), and Middle East (Saudi Arabia, Qatar).
• Fast Delivery: Stock items are dispatched within 24 hours of order confirmation to major industrial hubs and ports.
• Trade Compliance: Experienced in international export documentation and customs clearance.

Quality Assurance

• Manufacturing Standard: Produced under strict ISO 9001 quality management systems.
• Material Certification: Components are traceable and meet or exceed OEM specifications for hardness and dimensional accuracy.
• Testing: Each batch undergoes rigorous dimensional inspection and material composition analysis to ensure perfect fitment and durability.
• Warranty: Backed by a standard 12-month warranty against manufacturing defects.

FAQ

Q: What does “0.50mm oversize” mean?

A: This bearing is designed for an engine where the crankshaft journal has been ground down by 0.50mm (0.020 inches) to repair a damaged or worn surface. The bearing shell is thicker to compensate for this material removal, restoring the correct oil clearance and bearing crush.

Q: Is this a complete set for a 6BT engine?

A: Yes, this set includes all 7 main bearing shells and all 6 connecting rod bearing shells required for a complete 6BT engine rebuild. It does not include thrust washers, which are typically sold separately.

Q: How should I store these bearings before installation?

A: Store the bearings in their original packaging in a clean, dry, and temperature-controlled environment. Avoid exposing them to dust, dirt, or moisture. Do not remove the protective oil coating until immediately before installation to prevent corrosion.