Komatsu 4D92 Piston Ring Set 6141-31-2020 6140-31-2040 | Engine Parts

Product Details

Product Overview

This high-quality piston ring set is specifically engineered for Komatsu 4D92 diesel engines. Manufactured to meet or exceed OEM specifications, these rings (referencing part numbers 6141-31-2020 and 6140-31-2040) provide a critical seal for optimal compression and oil control. Our company supplies this component globally, serving major markets including North America, South America, Europe, Southeast Asia, the Middle East, and Africa, ensuring reliable performance for heavy equipment operations worldwide.

Key Features & Benefits

• Superior Wear Resistance: Manufactured from high-grade ductile iron or steel, providing extended service life in demanding excavator applications.
• Precision Engineering: Dimensional accuracy ensures perfect fitment within the piston grooves, reducing blow-by and maintaining peak cylinder pressure.
• Excellent Oil Control: Optimized ring profile and tension minimize oil consumption while ensuring proper lubrication of the cylinder wall.
• High-Temperature Durability: Designed to withstand the extreme thermal and mechanical stresses of a 4D92 engine, preventing ring breakage and failure.
• Direct Replacement: A drop-in fit for standard Komatsu engine rebuilds, saving time on installation and reducing downtime.

Technical Specifications

OEM Cross-Reference

This piston ring set is a direct replacement for the following original Komatsu part numbers:

• 6141-31-2020 (Top Ring)
• 6140-31-2040 (Second Ring / Oil Ring)

Note: Verify your specific engine model and piston groove configuration. These numbers correspond to the standard ring pack for the 4D92 engine.

Compatibility

• Engine Models: Komatsu 4D92, 4D92E
• Common Applications: Komatsu PC40, PC45, PC50, PC55, PC60 series mini excavators and other equipment utilizing the 4D92 engine platform.
• Year Range: Fits models typically manufactured from the mid-1990s through the 2010s. Always confirm engine serial number for precise compatibility.

Global Supply & Distribution

We are an experienced exporter of aftermarket and OEM-quality engine parts. Our logistics network ensures fast and reliable delivery to major industrial hubs worldwide.

• Worldwide Shipping: We ship via air (DHL, FedEx, UPS) and sea (FCL/LCL) to all major ports.
• Major Markets Served: United States, Canada, Brazil, United Kingdom, Germany, Australia, UAE, Saudi Arabia, South Africa, Singapore, and Japan.
• Delivery Time: Stock items typically ship within 24-48 hours. Express delivery to major cities (New York, London, Dubai, Shanghai) in 3-7 business days.
• Trade Compliance: We provide all necessary export documentation and ensure compliance with international trade regulations.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001 certified facilities.
• Testing: Each batch undergoes rigorous dimensional inspection, material hardness testing, and surface finish verification.
• Warranty: We offer a standard 12-month warranty against manufacturing defects from the date of shipment.
• Certification: Material test reports and certificate of conformance available upon request.

FAQ

Q: Will this piston ring set fit my Komatsu PC50 excavator?

A: Yes, if your PC50 is equipped with the 4D92 engine, this ring set (6141-31-2020 / 6140-31-2040) is the correct standard replacement. We recommend verifying your engine serial number and piston diameter before ordering to ensure a perfect match.

Q: Do I need to replace the piston and cylinder liner when installing new rings?

A: It is highly recommended to inspect the cylinder liner for wear, scoring, or out-of-roundness. For a proper rebuild, if the liner is worn beyond service limits, it should be replaced along with a new piston. Re-ringing a worn liner will lead to poor sealing and short service life.

Q: What is the recommended installation procedure for these rings?

A: Use a proper piston ring compressor to avoid damaging the rings or piston. Ensure the ring gaps are staggered (typically 120 degrees apart) and do not align with the wrist pin or thrust faces. Lubricate the rings and cylinder wall with clean engine oil during assembly. Always refer to the official Komatsu service manual for specific torque specs and clearance values for your 4D92 engine.