6d102 S6d102 Engine Piston 3957795 3957797 For Cummins 4bt 3.9l 6bt 5.9l Qsb5.9 Diesel Engine For

Product Details

Product Overview

This high-quality engine piston, identified by numbers 3957795, 3957797, and 111589, is a critical component for the Cummins B-series engine family. Specifically designed for the 6D102 and S6D102 engine blocks, this piston is commonly used in Cummins 4BT 3.9L, 6BT 5.9L, and QSB5.9 diesel engines.

While primarily engineered for Cummins applications, this piston is also a common replacement part for Komatsu PC200-6 and PC200-7 excavators which utilize these Cummins power plants. As a standard size (STD) component, it is ideal for engine rebuilds and overhauls where the cylinder bore remains within factory specifications.

Key Features & Benefits

• Precision Engineering: Manufactured to meet or exceed specifications for 6BT5.9 and 6D102 engine blocks, ensuring proper fitment and reliable performance.
• High-Strength Material: Constructed from premium high-strength aluminum alloy, providing excellent heat dissipation and durability under high-compression diesel operation.
• Exact Replacement: Directly replaces original Cummins parts 3957795, 3957797, and 111589, eliminating fitment guesswork during engine rebuilds.
• Standard Size (STD): Delivered at factory standard dimensions, suitable for engines with unmodified cylinder bores or those requiring standard replacement pistons.
• Proven Compatibility: Extensively used in Cummins 4BT 3.9L, 6BT 5.9L, and QSB5.9 engines powering industrial, agricultural, and construction equipment.
• Rigorous Quality Control: Each piston undergoes outgoing inspection with video documentation available upon request, ensuring dimensional accuracy and surface finish.

Technical Specifications

Cross-Reference

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

• Cummins: 3957795, 3957797, 111589
• Komatsu: Compatible with PC200-6 and PC200-7 models using Cummins 6BT5.9 engines

Please verify your engine’s serial number and current piston part number against these references to ensure correct selection.

Compatibility

This piston is commonly used for the following engine models and applications:

• Engine Models: Cummins 4BT 3.9L, 6BT 5.9L, QSB5.9, 6D102, S6D102
• Excavator Applications: Komatsu PC200-6, PC200-7
• Other Applications: Industrial generators, agricultural tractors, marine auxiliary engines, and construction equipment powered by the listed Cummins engines

Note: Fitment is based on engine model compatibility. Always confirm physical dimensions and engine specifications before installation.

Global Supply & Distribution

We maintain a robust global supply chain capable of shipping this piston to buyers worldwide. Our distribution network covers:

• North America: Fast delivery to major ports including Los Angeles, Houston, and New York
• Europe: Efficient shipping to Rotterdam, Hamburg, and Antwerp
• Asia-Pacific: Direct shipping from Guangdong, China to Singapore, Tokyo, and Sydney
• Middle East & Africa: Reliable service to Dubai, Jeddah, and Durban
• South America: Regular shipments to Santos, Callao, and Buenos Aires

With extensive export experience, we ensure proper documentation, customs compliance, and secure packaging for international freight. We support various shipping methods including sea freight, air freight, and express courier services.

Quality Assurance

Our pistons are manufactured in ISO-compliant facilities in Guangdong, China, with strict adherence to quality management systems. Each production batch includes:

• Material Certification: High-strength aluminum alloy verified for composition and mechanical properties
• Dimensional Inspection: Precision measurement of pin bore, ring grooves, and skirt diameter
• Visual Inspection: Outgoing inspection with video documentation available upon request
• Machinery Test Report: Provided with each shipment for quality traceability

We offer a standard 6-month warranty against manufacturing defects, with an optional 12-month extended warranty available. Our quality team is available to discuss testing procedures and certification requirements.

FAQ

Q1: How do I confirm this piston fits my Cummins 6BT5.9 engine?

Verify your existing piston part number. This piston replaces numbers 3957795, 3957797, and 111589. Additionally, check your engine data plate for the engine model (4BT 3.9L, 6BT 5.9L, or QSB5.9) and confirm the cylinder bore is at standard size (STD). If your engine has been rebored, you may require an oversized piston.

Q2: Can I install this piston myself, or should I use a professional mechanic?

Piston replacement is a complex internal engine procedure requiring specialized tools including a ring compressor, piston pin press, and torque wrench. We strongly recommend installation by a certified diesel mechanic or engine rebuilder. Improper installation, such as incorrect ring gap orientation or pin clearance, can lead to engine failure.

Q3: What maintenance should I perform after installing new pistons?

After installation, follow a proper break-in procedure: operate the engine at varying loads (avoid sustained high RPM) for the first 50 hours. Change engine oil and filter after initial break-in. Use high-quality diesel engine oil meeting Cummins CES 20074 or API CJ-4 specifications. Regularly monitor oil consumption and compression pressure to ensure proper piston ring seating.