Cummins 6BT5.9 Piston 3928673 | 50mm Chamber Size | Diesel Engine Parts

Product Details

Product Overview

This high-quality Cummins 6BT5.9 Piston (Part Number: 3928673) is a precision-engineered replacement component designed for the popular 5.9L diesel engine platform. Featuring a critical 50mm chamber size, this piston is manufactured to meet or exceed OEM specifications, ensuring reliable performance and long service life. As a key part of the Cummins B Series engine family, this piston is essential for maintaining compression, power output, and fuel efficiency in heavy-duty applications. We supply this component globally, serving key markets across North America, Europe, Asia-Pacific, the Middle East, and South America, with fast and reliable shipping to major industrial hubs.

Key Features & Benefits

• Precision Manufacturing: Machined to exacting tolerances for a perfect fit and optimal sealing within the cylinder bore.
• Durable Construction: Made from high-strength aluminum alloy with reinforced ring grooves to withstand extreme combustion pressures and temperatures.
• Optimized Chamber Design: The 50mm chamber is specifically designed for the 6BT5.9’s fuel injection and turbocharging system to promote efficient fuel mixing and complete combustion.
• Wear Resistance: Features a robust skirt coating to reduce friction and wear, extending the engine’s operational life between overhauls.
• Direct OEM Replacement: Engineered as a direct drop-in replacement for the original part (3928673), simplifying installation and reducing downtime.

Technical Specifications

OEM Cross-Reference

This piston is a direct replacement for the following OEM and aftermarket part numbers:

• Cummins OEM: 3928673
• Alternative/Aftermarket: 3802289, 3928674 (Oversize), 3971620

Compatibility

This piston is specifically designed for the Cummins 6BT5.9 engine. It is typically found in the following applications:

• Engine Models: 6BT5.9, B5.9, ISB5.9
• Vehicle/Equipment Applications:
  • Dodge Ram 2500/3500 (1989-2002 models with 5.9L Cummins)
  • Ford F-Series (Medium Duty Trucks)
  • Agricultural Tractors (Case IH, New Holland, John Deere)
  • Construction Equipment (Caterpillar, Komatsu, JCB)
  • Industrial Generators and Marine Engines

Global Supply & Distribution

We are a leading exporter of heavy-duty diesel engine parts with a robust global logistics network. Our capabilities include:

• Worldwide Shipping: We ship to over 50 countries via air, sea, and express courier (DHL, FedEx, UPS).
• Key Markets: Strong presence in North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands), Asia-Pacific (Australia, Singapore, UAE), and the Middle East (Saudi Arabia, Qatar).
• Fast Delivery: Orders are processed within 24 hours. Express shipping to major ports (Rotterdam, Shanghai, Houston, Jebel Ali) typically takes 5-8 business days.
• Trade Compliance: We adhere to international trade regulations and provide all necessary documentation for customs clearance.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001:2015 certified facilities.
• Material Testing: Each batch undergoes spectrographic analysis to verify alloy composition.
• Dimensional Inspection: 100% inspection of critical dimensions (chamber size, pin bore, ring groove height) using CMM (Coordinate Measuring Machine).
• Warranty: All parts are backed by a 12-month warranty against manufacturing defects.

FAQ

Q1: Is this piston a direct fit for my 1998 Dodge Ram 3500 with a 6BT5.9 engine?
Yes, this piston (Part Number 3928673) is the standard OEM specification for the 6BT5.9 engine found in Dodge Ram trucks from 1989 to 2002. It is a direct replacement. Please confirm your engine’s bore size is standard (102mm) before ordering. If your cylinders have been bored oversize, you will need a corresponding oversize piston.

Q2: What is the correct installation procedure for this piston?
Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Ensure the cylinder bore is clean and honed to the correct finish. 2) Lubricate the piston skirt and rings with clean engine oil. 3) Use a proper ring compressor to install the piston into the bore. 4) Ensure the arrow on the piston crown points toward the front of the engine. 5) Torque the connecting rod bolts to the manufacturer’s specification (typically 89 ft-lbs for 6BT5.9).

Q3: How can I verify the quality of this piston before installation?
Before installation, we recommend measuring the piston diameter and ring groove clearances with a micrometer to ensure they are within service limits. You should also inspect the ring grooves for burrs. If you have access to a scale, you can verify the weight matches the specification (approx. 850g) to ensure proper engine balance. Our parts come with a quality certificate upon request.