3947270
O Ring Seal
Cummins®

The Cummins 3947270 O Ring Seal is a critical component designed to maintain the integrity of seals within commercial truck systems. It plays a significant role in ensuring the operational efficiency and reliability of these vehicles by preventing leaks and maintaining correct pressure conditions ¹.

Basic Concepts of O Ring Seals

An O Ring Seal is a toroidal (ring-shaped) piece of elastomer designed to create a seal between two or more parts. When compressed, it deforms to fill the space and block the passage of fluids or gases, making it vital in hydraulic, pneumatic, and fuel systems ².

Purpose of the 3947270 O Ring Seal in Truck Operation

This Cummins part ensures the integrity of seals in various truck systems, including fuel and hydraulic systems. By maintaining these seals, it contributes to the efficient operation of the truck’s systems and helps prevent leaks that could lead to performance issues or safety hazards ³.

Key Features of the 3947270 O Ring Seal

Made from durable elastomers, this part exhibits resistance to various fluids encountered in truck operations. It is designed to operate within a specific temperature range, ensuring reliable performance under varying conditions. These features make it suitable for the demanding environments typical of commercial truck applications.

Benefits of Using the 3947270 O Ring Seal

Utilizing this part offers several advantages, including improved system reliability through effective seals, reduced maintenance needs, and enhanced performance in sealing applications, thereby maintaining the operational efficiency of the truck’s systems.

Installation Considerations

Proper installation of this part is essential for its effectiveness and longevity. Best practices include ensuring the sealing surfaces are clean and free of debris before installation. The O Ring should be lubricated with a compatible fluid to facilitate installation and reduce the risk of damage. Careful handling and installation according to manufacturer guidelines will help ensure the seal performs as intended.

Troubleshooting Common Issues

Common problems associated with O Ring Seals, such as leaks or failures, can often be traced back to installation issues or environmental factors. Troubleshooting steps may include inspecting the seal for signs of wear or damage, checking the condition of the sealing surfaces, and ensuring the O Ring is the correct size and material for the application. Addressing these issues promptly can help maintain the integrity of the system.

Maintenance Tips

Regular maintenance of this part is important for ensuring continued effective performance. This includes periodic inspection for signs of wear or damage and replacement according to manufacturer guidelines or as part of routine maintenance schedules. Keeping the sealing surfaces clean and free of contaminants will also contribute to the longevity of the seal.

Cummins Corporation Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and commitment to quality, Cummins serves customers in approximately 190 countries and territories through a network of company-owned and independent distributor facilities and dealerships. The company’s product range includes engines for on-highway, off-highway, and stationary applications, as well as related technologies that increase fuel efficiency and reduce emissions.

Cummins O Ring Seal 3947270 Compatibility

This Cummins part is designed to fit a variety of Cummins engines, ensuring the integrity of fluid systems by preventing leaks and ensuring that fluids remain within their designated pathways. Here is a detailed breakdown of the engines with which this O Ring Seal is compatible:

ISB and ISBE Series

• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISBE CM2150
• ISBE4 CM850

ISC Series

• ISC CM2150
• ISC CM850
• ISC8.3 CM2250

ISL Series

• ISL CM2150
• ISL9 CM2150 SN
• ISL9 CM2250
• ISL9.5 CM2880 L138

ISF Series

• ISF3.8 CM2220 AN

ISD Series

• ISD4.5 CM2220 D108

QSB Series

• QSB4.5 CM2250 EC

B Series

• 6C8.3
• B5.6 CM2670 B152B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C

This part is engineered to provide a reliable seal in these engines, ensuring that critical fluids such as oil, coolant, and hydraulic fluids are contained within their respective systems. This seal is particularly important in maintaining engine performance and longevity by preventing contamination and ensuring that fluid levels remain stable.

Role of Part 3947270 O Ring Seal in Engine Systems

This part is an essential component in ensuring the integrity and efficiency of various engine systems. Its application spans across multiple components, each playing a significant role in the overall performance of the engine.

Fuel System Integration

In the Fuel Injection Pump and Fuel Pump Assembly, the O Ring Seal is utilized to create a tight seal between moving parts and stationary components. This ensures that fuel is delivered under precise pressure without any leaks, which is vital for the consistent operation of the engine. Similarly, in the Fuel Pump Kit and Fuel Pump Adapter, the seal prevents fuel from escaping, maintaining the required pressure levels for optimal fuel delivery.

Actuator and Valve Sealing

The Electronic Fuel Control Actuator relies on the O Ring Seal to maintain a secure connection between the actuator and the fuel system. This seal is responsible for preventing any fuel leakage that could disrupt the electronic signals and affect the actuator’s performance. In the Pressure Regulator Valve, the O Ring Seal ensures that the valve can regulate fuel pressure accurately without any bypass, which is essential for the engine’s fuel efficiency and power output.

Comprehensive Sealing Solutions

Within the Lower Engine Gasket Kit and Service Kit, the O Ring Seal is a key component that ensures all gaskets are properly sealed. This is particularly important in high-stress areas where vibrations and temperature fluctuations could otherwise lead to gasket failure. The seal’s durability and flexibility make it suitable for these demanding environments.

XPI JV System Compatibility

For the XPI JV Components and XPI JV System Cummins MR, the O Ring Seal is integral to the system’s design. It ensures that the high-pressure fuel lines and connections remain leak-free, which is crucial for the system’s ability to deliver fuel at the precise moments required for combustion. This not only enhances engine performance but also contributes to the longevity of the fuel system components.

Conclusion

In summary, the O Ring Seal, part number 3947270, plays a multifaceted role in various engine components, ensuring that fuel systems operate efficiently, actuators function correctly, and overall engine integrity is maintained. Its application across different systems underscores its importance in the engine’s design and operation.