CUMMINS NH855 And NT855 Engine OEM 200354 3017759 Valve Seat Auto Parts

NH855 NT855 SET:

---Valve guide oem: 3006456

---Intake valve seat oem: 200354

---Exhaust valve seat oem:  3017759

The CUMMINS Valve Seat (OEM: 200354/3017759) represents a critical sealing component engineered specifically for NH855 and NT855 series engines, delivering uncompromising performance in demanding industrial and transportation applications. These precision-crafted seats form the essential sealing interface between the cylinder head and valves, maintaining combustion pressure, facilitating heat transfer, and ensuring proper valve alignment under extreme operating conditions. Designed to withstand the rigorous demands of construction equipment, marine propulsion, and power generation systems, these valve seats play a vital role in preserving engine efficiency and preventing power loss in high-hour applications where reliability is paramount.

Advanced Material Technology for Enhanced Durability
Manufactured from high-chromium alloy steel with specialized heat treatment processes, these valve seats exhibit exceptional resistance to thermal fatigue and abrasive wear – common challenges in diesel engines operating under continuous heavy loads. The material composition incorporates cobalt-nickel enhancements that maintain hardness characteristics even at elevated temperatures, preventing seat recession that can lead to compression loss and valve burning. This sophisticated metallurgical formula proves particularly valuable in NT855 turbocharged configurations where exhaust gas temperatures routinely exceed 1,200°F, ensuring dimensional stability and sealing integrity throughout extended service intervals.

Precision Engineering for Optimal Performance
Each valve seat undergoes CNC machining to achieve micron-level tolerances, ensuring perfect concentricity and surface finish for uniform valve contact. The precisely calculated interference fit maintains secure seating during thermal cycling, while the optimized seat angles promote efficient airflow and combustion characteristics. This manufacturing precision translates directly to improved fuel efficiency and reduced emissions by maintaining ideal compression ratios throughout the engine's operational range. The seats feature laser-etched identification marks that simplify installation and prevent mixing of intake and exhaust components during cylinder head reassembly.

Enhanced Thermal Management Properties
The exhaust seats incorporate advanced copper-core technology that creates a thermal barrier between the combustion chamber and cylinder head, reducing heat transfer to critical head structures. This design innovation minimizes thermal stress cracking while maintaining optimal operating temperatures for both the seat and valve interface. The intake seats feature micro-porous surface treatments that retain lubricating oil films, reducing wear during cold starts and low-lubrication conditions. These thermal management features work synergistically to extend component life and maintain sealing integrity across diverse operating environments.

Professional Installation and Maintenance Guidelines
Proper installation requires specialized machining equipment to achieve the factory-specified interference fit between the seat and cylinder head counterbore. Always conduct thorough cleaning of the head seating surfaces before installation to ensure optimal heat transfer characteristics. Recommended valve seat recession checks should be performed every 3,000 operating hours as part of preventive maintenance programs. For engines experiencing seat recession issues, these OEM-spec seats should be installed as complete sets per cylinder along with matching valves and guides to restore optimal valve train geometry and performance characteristics.

With over 30 years of expertise in automotive parts export, we specialize in manufacturing high-precision, high-performance components for global markets. Our products meet stringent quality standards and are trusted by clients worldwide.

• Equipped with advanced testing machinery for material analysis and heat treatment verification.
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