Cummins QSX15 Piston Ring Set 4089406 | Heavy-Duty Engine Parts

Product Details

Product Overview

This premium piston ring set, part number 4089406, is specifically engineered for the Cummins QSX15 heavy-duty diesel engine. As a critical component for maintaining compression and oil control, this ring set is manufactured to meet or exceed OEM specifications. We serve a global network of B2B clients, including heavy equipment dealers, engine rebuilders, and fleet operators across North America, Europe, the Middle East, and Asia-Pacific. Our supply chain ensures fast, reliable shipping to major industrial hubs worldwide.

Key Features & Benefits

• Superior Durability: Constructed from high-grade ductile iron with a wear-resistant chrome or molybdenum coating, ensuring long service life in demanding applications.
• Optimized Oil Control: Advanced ring profile design minimizes oil consumption while maintaining a consistent oil film for reduced friction.
• Enhanced Compression: Ensures a tight seal for maximum cylinder pressure, improving fuel efficiency and engine power output.
• Direct Fitment: Precision-engineered to match the exact dimensions of the QSX15 cylinder bore, eliminating the need for modifications.
• Heat Resistance: Designed to withstand the high thermal loads of turbocharged, heavy-duty diesel operation.

Technical Specifications

OEM Cross-Reference

• Cummins OEM: 4089406
• Alternative Part Numbers: 4089406RX, 4089406NX (Replacement/Aftermarket variations)
• Note: This part is a direct replacement for the original Cummins 4089406 ring set. Always verify your engine serial number for compatibility.

Compatibility

• Engine Models: Cummins QSX15 (All variants including QSX15-G, QSX15-T, QSX15-E)
• Vehicle Applications: Heavy-duty trucks, mining haul trucks, construction equipment (excavators, bulldozers), industrial generators, and marine engines.
• Year Range: 2000 – Present (Production years for QSX15 series)

Global Supply & Distribution

• Worldwide Shipping: We ship to all major global destinations via air, sea, and express courier (DHL, FedEx, UPS).
• Major Markets: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands), Asia-Pacific (Australia, Singapore, UAE), Middle East (Saudi Arabia, Qatar).
• Fast Delivery: Expedited shipping available to industrial centers like Houston, Rotterdam, Dubai, and Shanghai.
• Trade Compliance: All products are exported with full customs documentation and comply with international trade regulations.

Quality Assurance

• Manufacturing Standard: ISO 9001:2015 certified production facility.
• Testing: Each ring set undergoes strict dimensional inspection, material hardness testing, and surface finish verification.
• Warranty: 12-month warranty against manufacturing defects from the date of purchase. Defective parts are eligible for replacement.

FAQ

Q1: Will this piston ring set fit my Cummins QSX15 engine with a different bore size?

This specific set (Part #4089406) is designed for the standard 137mm bore. If your engine has been re-bored to an oversize (e.g., 0.25mm, 0.50mm), you will need a corresponding oversize ring set. Please check the cylinder bore diameter before ordering.

Q2: What is the recommended installation procedure for these rings?

Installation should be performed by a qualified diesel technician. Key steps include: (1) Clean the ring grooves thoroughly, (2) Check ring end-gap in the cylinder bore using a feeler gauge (gap should be within 0.35-0.55mm), (3) Stagger the ring gaps 120° apart to prevent blow-by, and (4) Use a ring compressor when installing the piston into the cylinder.

Q3: How do I identify a genuine Cummins 4089406 piston ring set vs. a counterfeit?

Genuine Cummins parts have a distinct laser-etched part number and a consistent, uniform surface finish. Our aftermarket rings are manufactured to the same high standards but may lack the OEM branding. Always purchase from a reputable supplier with a documented quality control process and warranty policy.