3406749
O Ring Seal
Cummins®

Introduction

The Cummins 3406749 O Ring Seal is a critical component for commercial trucks, designed to maintain system integrity by providing reliable sealing in various applications. Ensuring the proper function of seals like the 3406749 is essential for the efficient operation of truck systems, preventing leaks and maintaining performance standards.

Basic Concepts of O Ring Seals

An O Ring Seal is a type of gasket made from a doughnut-shaped piece of elastomeric material. It functions by creating a seal when compressed between two surfaces. Common materials for O rings include nitrile rubber, silicone, and fluorocarbon. The principle of elastomeric sealing relies on the material’s ability to deform under compression, filling any irregularities in the mating surfaces to create a tight seal ¹.

Purpose of the 3406749 O Ring Seal in Truck Operations

The 3406749 O Ring Seal plays a specific role in the operation of commercial trucks. It is utilized in various systems and components where sealing is required to prevent fluid leaks and ensure system efficiency. Its application can be found in fuel systems, hydraulic systems, and other critical areas where maintaining a seal is necessary for optimal performance ².

Key Features of the 3406749 O Ring Seal

The design and construction of the 3406749 O Ring Seal include specific features that enhance its functionality. It is composed of a durable elastomeric material, designed to withstand the pressures and temperatures encountered in truck operations. The dimensions of the seal are tailored to fit precisely within the designated applications, ensuring a reliable seal. Unique characteristics may include resistance to specific chemicals or enhanced durability under extreme conditions ³.

Benefits of Using the 3406749 O Ring Seal

Utilizing the 3406749 O Ring Seal offers several advantages. It provides enhanced sealing performance, ensuring that systems operate without leaks. The seal’s durability contributes to its longevity, reducing the need for frequent replacements. Additionally, its resistance to various operating conditions, including temperature fluctuations and exposure to chemicals, makes it a reliable choice for commercial truck applications ⁴.

Installation Guidelines

Proper installation of the 3406749 O Ring Seal is crucial for its effectiveness. The process involves preparing the sealing surfaces to ensure they are clean and free of debris. The O ring should be fitted into the groove without twisting or damaging it. Torque specifications, if applicable, should be followed to ensure the components are tightened to the manufacturer’s recommendations without over-tightening, which could damage the seal .

Maintenance and Troubleshooting

Regular maintenance practices can help ensure the longevity and effectiveness of the 3406749 O Ring Seal. Inspections should be conducted to check for signs of wear or damage. Common issues may include leaks, which can often be traced back to improper installation or degradation of the seal material. Troubleshooting tips include verifying the correct installation and considering replacement if the seal shows signs of wear .

Compatibility and Applications

The 3406749 O Ring Seal is designed for use in specific systems and components within commercial trucks. Its applications may include fuel systems, hydraulic systems, and other areas where sealing is critical. Compatibility notes should be considered to ensure the seal is suitable for the intended application .

Cummins: A Brief Overview

Cummins Inc. is a well-established manufacturer in the commercial truck industry, known for its wide range of products, including engines, filtration systems, and aftermarket parts. The company has a history of innovation and quality, making it a reputable choice for truck operators and maintenance professionals .

Cummins Engine O Ring Seal 3406749 Compatibility

The O Ring Seal part number 3406749, manufactured by Cummins, is designed to fit a variety of Cummins engines. This seal is essential for maintaining the integrity of various engine components by preventing leaks and ensuring a tight seal in critical areas.

B6.7S and ISC8.3 CM2250

The O Ring Seal 3406749 is compatible with both the B6.7S and ISC8.3 CM2250 engines. These engines are known for their robust performance and reliability, often used in heavy-duty applications. The seal ensures that the engine’s internal components remain sealed, preventing any fluid leaks that could compromise engine performance.

ISX12/ISX11.9 CM2250

For the ISX12 and ISX11.9 CM2250 engines, the O Ring Seal 3406749 plays a crucial role in maintaining the seal between different parts of the engine. These engines are designed for high-performance applications and require precise sealing to function optimally. The seal ensures that the engine operates efficiently and reliably.

N14 CELECT PLUS

The N14 CELECT PLUS engine also benefits from the O Ring Seal 3406749. This engine is known for its durability and efficiency, often used in various industrial applications. The seal is essential for maintaining the engine’s performance and longevity by preventing leaks and ensuring a tight seal in critical areas.

QSK95 CM2350 K113 and X15 CM2350 X116B

The O Ring Seal 3406749 is also compatible with the QSK95 CM2350 K113 and X15 CM2350 X116B engines. These engines are designed for heavy-duty applications and require reliable sealing to function effectively. The seal ensures that the engine’s components remain sealed, preventing any fluid leaks that could affect performance.

Role of Part 3406749 O Ring Seal in Engine Systems

The 3406749 O Ring Seal is instrumental in ensuring the integrity and efficiency of various engine systems by providing reliable sealing solutions. Here’s how it integrates with the provided components:

Aftermarket Turbocharger

In aftermarket turbochargers, the O Ring Seal is used to create a tight seal between the turbocharger housing and the engine block. This prevents any unwanted air leaks, ensuring that the turbocharger operates efficiently and delivers the expected boost.

Air Cleaner Plumbing

For air cleaner plumbing, the O Ring Seal is employed at connection points to maintain a sealed pathway for air intake. This ensures that unfiltered air does not enter the engine, which could lead to contamination and reduced performance.

Air Shutdown Device

In the air shutdown device, the O Ring Seal is critical for sealing the device when it is engaged. This prevents air from bypassing the shutdown mechanism, ensuring that the engine can be effectively shut down when necessary for maintenance or emergency situations.

Auxiliary Pump

When used with an auxiliary pump, the O Ring Seal ensures that the pump’s fluid pathways remain sealed. This is essential for maintaining the pressure and flow integrity of the pumped fluid, whether it is fuel, lubricant, or coolant.

Compressor Air Inlet Plumbing

In compressor air inlet plumbing, the O Ring Seal is used at various joints and connections to prevent air leaks. This ensures that the compressor receives a consistent airflow, which is vital for its efficient operation and the overall performance of the engine.

Flywheel Housing

The O Ring Seal in the flywheel housing helps to seal the housing against the engine block. This prevents any lubricants or contaminants from entering the housing, which could affect the operation of the flywheel and, consequently, the engine’s performance.

Front Gear Train Accessory Drive

In the front gear train accessory drive, the O Ring Seal is used to seal various components and passages. This ensures that the drive system operates smoothly without any lubricant leaks, which could lead to increased wear and potential failure.

Fuel Pump Gear Cover

For the fuel pump gear cover, the O Ring Seal is essential for maintaining a sealed environment around the gear cover. This prevents fuel leaks and ensures that the fuel pump operates efficiently, delivering the correct fuel pressure to the engine.

Rear Gear Housing

In the rear gear housing, the O Ring Seal is used to create a seal between the housing and the engine block. This prevents any lubricants from leaking out, which is vital for the lubrication and cooling of the gear components.

Turbocharger

Within the turbocharger, the O Ring Seal is used at various joints and connections to ensure that the turbocharger maintains its efficiency. This includes sealing the compressor and turbine housings to prevent air leaks that could reduce boost pressure.

Turbocharger Kit

In a turbocharger kit, the O Ring Seal is included to ensure all components are properly sealed during installation. This is important for maintaining the kit’s performance and longevity, as well as ensuring the turbocharger operates within its designed parameters.

Conclusion

The Cummins 3406749 O Ring Seal is a versatile and essential component for maintaining the integrity of various Cummins engines and engine systems. Its reliable sealing capabilities ensure that engines operate efficiently and reliably by preventing leaks and maintaining a tight seal in critical areas. Proper installation, regular maintenance, and understanding its compatibility with specific engine models are key to maximizing the benefits of this Cummins part.