Oem Quality Std 107mm Engine Piston 4934860 3975868 4931888 Fitting For Cummins Isb Qsb 6.7l 6d107

Product Details

Product Overview

This high-quality diesel engine piston assembly, identified by the primary OEM part number 4934860, is engineered as a direct replacement for the Cummins ISB and QSB 6.7-liter (6D107) engine platform. Designed to exacting OEM specifications, this piston features a standard (STD) 107mm bore diameter, making it suitable for a wide range of heavy-duty applications.

Commonly used in construction machinery such as the Komatsu PC200-8 excavator and Hyundai loaders, as well as various truck and industrial motor applications, this component is critical for restoring engine compression and performance. The assembly includes a high-strength aluminum alloy skirt with a steel crown, ensuring durability under high thermal and mechanical loads.

Please verify your engine model (QSB6.7, ISB6.7, or 6D107) and existing piston specifications before ordering to ensure a precise fit.

Key Features & Benefits

• OEM Specification Fit: Manufactured to match the exact dimensions and tolerances of the original Cummins piston, providing reliable sealing and consistent compression ratios.
• Durable Material Composition: Constructed from high-strength aluminum alloy for the skirt and premium steel for the crown, offering excellent heat dissipation and resistance to thermal fatigue.
• Standard Size (STD) Accuracy: This 107mm STD piston eliminates the need for cylinder re-boring in engines with standard wear, simplifying the overhaul process and reducing downtime.
• Comprehensive Cross-Reference: Directly replaces multiple OEM numbers including 3975868, 4931888, 4955160, and 4376353, ensuring broad compatibility across different engine generations.
• Rigorous Quality Control: Each piston undergoes strict dimensional and material testing to ensure it meets the demands of heavy-duty diesel operation.
• Versatile Application: Suitable for both on-highway truck engines and off-highway machinery like excavators and loaders, providing a single solution for diverse fleets.

Technical Specifications

OEM Cross-Reference

This piston assembly is a direct replacement for the following genuine OEM part numbers. Use this list to verify compatibility with your existing engine parts:

• Cummins OEM: 4934860
• Alternative OEM Numbers: 4955160, 4931888, 3975868, 4376353

Note: While these numbers are cross-referenced, we recommend comparing your original piston’s dimensions and ring configuration to ensure an exact match.

Compatibility

This piston is specifically designed for the Cummins 6.7L engine family. It is commonly used for the following engine models and applications:

• Engine Series: Cummins ISB6.7, QSB6.7, and 6D107 (6.7L displacement)
• Vehicle / Machinery Applications:
  • Excavators: Komatsu PC200-8 (commonly uses QSB6.7 engine)
  • Loaders: Hyundai Loader models equipped with Cummins 6.7L engines
  • Trucks & Buses: Various medium-duty trucks and buses using ISB6.7 powertrains
  • Industrial Equipment: Generator sets and agricultural machinery powered by the QSB6.7 platform

Fitment is inferred based on common OEM specifications. Always check your engine serial number and piston part number for final confirmation.

Global Supply & Distribution

We maintain a robust global supply chain to ensure fast and reliable delivery to B2B customers worldwide. Our export experience covers key industrial and logistics hubs, allowing us to serve diverse markets efficiently.

• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands, France), Asia-Pacific (Australia, Japan, South Korea, Singapore), Middle East (UAE, Saudi Arabia), and South America (Brazil, Chile).
• Shipping Capabilities: We offer flexible shipping options including express couriers (DHL, FedEx, UPS), air freight, and sea freight to major ports such as Los Angeles, Rotterdam, Shanghai, and Jebel Ali.
• Trade Compliance: All shipments are properly documented for international customs clearance, with competitive freight rates and efficient logistics coordination to minimize lead times.

Quality Assurance

We prioritize product reliability and customer satisfaction through stringent quality control measures.

• Manufacturing Standards: Components are produced in ISO-certified facilities, adhering to strict dimensional and metallurgical standards.
• Testing Procedures: Each batch undergoes machinery test reports and outgoing video inspections to verify quality before dispatch.
• Warranty Coverage: All pistons are backed by a warranty period of 6 to 12 months against manufacturing defects, providing peace of mind for your engine rebuild.

FAQ

Q: How do I confirm if this 4934860 piston fits my engine?
A: First, verify your engine model is a Cummins ISB6.7, QSB6.7, or 6D107. Then, check your current piston for the part number (e.g., 3975868 or 4931888). Finally, measure the cylinder bore diameter; this piston is for a 107mm standard bore. If your engine has been previously rebored, this STD piston will not fit.

Q: What is included in the piston assembly?
A: This is a piston assembly, which typically includes the piston body, piston pin, and snap rings. Please note that piston rings may be sold separately. We recommend using new rings specifically designed for the 107mm bore to ensure proper sealing and oil control.

Q: What maintenance steps should I take during installation?
A: Ensure the cylinder bore is clean and within specification. Lubricate the piston pin and connecting rod bushing during assembly. Always use a new head gasket and follow the manufacturer’s torque specifications for the connecting rod bolts. After installation, perform a cold break-in procedure before loading the engine heavily.