3979769
Exhaust Gas Recirculation Valve Gasket
Cummins®

The Exhaust Gas Recirculation Valve Gasket, identified by Part #3979769, is a component manufactured by Cummins, a leader in the production of diesel engines and related technologies. This gasket plays a significant role in the operation of commercial trucks by ensuring the proper function of the Exhaust Gas Recirculation (EGR) system. Understanding its purpose, function, and maintenance is vital for maintaining engine efficiency and compliance with emission standards.

Basic Concepts of Exhaust Gas Recirculation Valve Gasket

The Exhaust Gas Recirculation (EGR) system is designed to reduce nitrogen oxides (NOx) emissions by recirculating a portion of the exhaust gas back into the intake manifold. This process lowers the combustion temperature, thereby reducing the formation of NOx ¹. The EGR Valve Gasket is a critical component within this system, sealing the connection between the EGR valve and the engine. It is typically made from materials such as rubber, metal, or a composite of both, chosen for their durability, heat resistance, and ability to create a reliable seal under varying engine conditions.

Purpose and Function of the Exhaust Gas Recirculation Valve Gasket

The Exhaust Gas Recirculation Valve Gasket serves to maintain the integrity of the seal between the EGR valve and the engine. By ensuring a tight seal, it allows the EGR system to function effectively, redirecting exhaust gases back into the combustion process. This not only aids in reducing NOx emissions but also contributes to improved engine efficiency by promoting a more complete burn of the fuel-air mixture ².

Key Features

The Exhaust Gas Recirculation Valve Gasket is engineered with specific features to enhance its performance and durability. Its design incorporates materials that can withstand high temperatures and pressures, ensuring a reliable seal under demanding engine conditions. The gasket’s composition may include a blend of rubber and metal, providing both flexibility and strength. Additionally, its unique attributes, such as resistance to oil and coolant, further contribute to its longevity and effectiveness in the EGR system.

Benefits

Utilizing the Exhaust Gas Recirculation Valve Gasket offers several advantages. It supports improved emission control by ensuring the EGR system operates as intended, reducing the output of harmful NOx emissions. Furthermore, by maintaining the efficiency of the EGR system, the gasket contributes to enhanced engine performance and increased fuel efficiency, making it a valuable component for commercial truck operations ³.

Troubleshooting and Maintenance

Common issues with the Exhaust Gas Recirculation Valve Gasket may include leaks or failures due to wear and tear, exposure to extreme temperatures, or contamination. Symptoms of a failing gasket can include increased emissions, decreased engine performance, or the illumination of the check engine light. Regular inspection and replacement of the gasket as part of routine maintenance can help prevent these issues, ensuring the longevity and effectiveness of the EGR system.

Fitment for Cummins Engines

The Exhaust Gas Recirculation Valve Gasket part number 3979769, manufactured by Cummins, is designed to fit a variety of Cummins engines. This gasket plays a crucial role in ensuring a proper seal between the EGR valve and the engine block, preventing exhaust gases from leaking and maintaining optimal engine performance.

ISB Series Engines

The EGR Valve Gasket 3979769 is compatible with several variants of the ISB series engines:

• ISB CM2150
• ISB6.7 CM2250
• ISB6.7 CM2350 B101

B Series Engines

The gasket also fits the following B series engines:

• B6.7 CM2350
• B135B

QSB and QSL Series Engines

The EGR Valve Gasket 3979769 is also suitable for the following QSB and QSL series engines:

• QSB6.7 CM2250
• QSL9 CM2250
• QSL9 CM2350 L102

ISC and ISL Series Engines

For the ISC and ISL series engines, the gasket fits:

• ISC8.3 CM2250
• ISL9 CM2250

ISX Series Engine

Lastly, the EGR Valve Gasket 3979769 is compatible with the ISX12 G CM2180 EJ engine, which is known for its high power output and is often used in heavy-duty on-highway applications.

Role of Exhaust Gas Recirculation Valve Gasket in Engine Systems

The Exhaust Gas Recirculation Valve Gasket, identified by part number 3979769, is an essential component in ensuring the proper functioning of various engine systems. Its primary role is to create a secure seal between the Exhaust Gas Recirculation (EGR) valve and the intake manifold. This seal is vital for the effective operation of the EGR system, which recirculates a portion of the exhaust gas back into the intake system to reduce nitrogen oxides (NOx) emissions.

Integration with Key Engine Components

1. Air Intake Connection: The gasket ensures that the recirculated exhaust gases are properly introduced into the air intake stream without any leaks. This integration is key to maintaining the correct air-fuel ratio and ensuring efficient combustion.

2. EGR Cooler Kit: When used in conjunction with an EGR cooler kit, the gasket helps maintain the integrity of the cooling system by preventing any exhaust gas leaks that could compromise the cooling efficiency and lead to increased temperatures in the intake air.

3. Engineering Valve Kit: The gasket works seamlessly with the engineering valve kit by providing a reliable seal that allows the EGR valve to modulate the flow of exhaust gases accurately. This ensures that the valve can perform its function without any interference from leaks.

4. Exhaust Gas Recirculation System: As a core component of the EGR system, the gasket plays a significant role in ensuring that the recirculated exhaust gases are effectively managed. This helps in reducing emissions and improving overall engine performance.

5. Exhaust Recirculation Air Plumbing: The gasket is integral to the exhaust recirculation air plumbing by ensuring that the plumbing system remains sealed. This prevents any unwanted air from entering the system, which could disrupt the recirculation process.

6. Exhaust Recirculation Valve Kit: When part of an exhaust recirculation valve kit, the gasket ensures that the valve can operate within specified parameters, contributing to the longevity and reliability of the EGR system.

7. Hardware Kit: The gasket complements the hardware kit by providing the necessary sealing properties that allow the hardware components to function correctly. This includes bolts, clamps, and other fasteners that secure the EGR valve in place.

8. Intake Assembly Connection: By ensuring a tight seal at the intake assembly connection, the gasket helps in maintaining the pressure integrity of the intake system. This is essential for optimal engine performance and fuel efficiency.

9. Service Kit: Included in many service kits, the gasket is a replacement part that ensures the EGR system can be restored to its original efficiency during maintenance procedures.

10. Upper Engine Gasket Kit: Often found in upper engine gasket kits, the gasket is part of a comprehensive solution for sealing various engine components, ensuring that the EGR system operates in harmony with other engine systems.

Conclusion

The Exhaust Gas Recirculation Valve Gasket, part number 3979769, is a critical component in the operation of Cummins engines, ensuring the effective functioning of the EGR system. Its role in sealing the connection between the EGR valve and the engine is essential for reducing emissions, improving engine efficiency, and maintaining compliance with emission standards. Regular maintenance and timely replacement of this gasket are crucial for the longevity and performance of the engine.