3947269
O Ring Seal
Cummins®

Introduction

The Cummins 3947269 O Ring Seal is a component designed for use in heavy-duty truck maintenance and operation. This seal plays a role in ensuring the integrity of various systems within these vehicles, contributing to their overall performance and reliability. Understanding its purpose and significance is important for maintaining the efficiency and longevity of heavy-duty trucks.

Basic Concepts of O Ring Seals

An O Ring Seal is a type of gasket consisting of a ring with a circular cross-section. It is used to create a seal between two or more parts. These seals function by being compressed within a groove, forming a barrier that prevents the leakage of fluids or gases. Common materials for O Ring Seals include rubber, silicone, and fluorocarbon, each offering different levels of durability, temperature resistance, and chemical compatibility. The seal operates by deforming under pressure to fill the space between mating surfaces, thereby creating an effective seal ¹.

Purpose of the 3947269 O Ring Seal in Truck Operation

The 3947269 O Ring Seal is specifically designed to play a role in the operation of heavy-duty trucks. It is associated with various systems or components within these vehicles, ensuring that fluids and gases remain contained within their designated pathways. This seal contributes to the efficient operation of the truck’s engine and other critical systems by maintaining the integrity of these pathways.

Key Features of the 3947269 O Ring Seal

The design and construction of the 3947269 O Ring Seal include features that make it suitable for its intended applications. These features may include the material’s durability, which allows it to withstand the harsh conditions often encountered in heavy-duty truck operations. The size of the seal is tailored to fit specific grooves within the truck’s components, ensuring a precise fit. Additionally, its compatibility with other components is crucial for maintaining system integrity.

Benefits of Using the 3947269 O Ring Seal

The use of the 3947269 O Ring Seal offers several advantages. It contributes to improved system efficiency by ensuring that fluids and gases are effectively contained. The seal’s durability and reliability in demanding conditions help extend the longevity of the truck’s components. Furthermore, its proper function is important for maintaining the overall reliability of the vehicle, reducing the likelihood of leaks or failures.

Installation and Maintenance

Proper installation of the 3947269 O Ring Seal involves several preparation steps and the use of appropriate tools. It is important to ensure that the groove where the seal will be placed is clean and free of debris. The seal should be lubricated before installation to facilitate its placement and ensure it seats correctly within the groove. Regular maintenance, including inspection for wear or damage, is important to ensure the seal’s longevity and optimal performance ².

Troubleshooting Common Issues

Common problems associated with O Ring Seals, such as leaks or failures, can often be traced back to issues with installation, material degradation, or incompatible operating conditions. Troubleshooting these issues involves a systematic approach to identifying the root cause, whether it be improper installation, exposure to harsh chemicals, or excessive temperatures. Addressing these issues promptly can help maintain the seal’s effectiveness and the overall performance of the truck’s systems ³.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established itself as a provider of quality and innovative solutions for the heavy-duty truck industry. Its commitment to excellence is reflected in the design and performance of components like the 3947269 O Ring Seal, which are engineered to meet the demanding requirements of heavy-duty applications.

Cummins O Ring Seal 3947269 Compatibility

The Cummins O Ring Seal part number 3947269 is a versatile component designed to fit a wide range of Cummins engines. This seal is crucial for maintaining the integrity of various engine systems by preventing leaks and ensuring that fluids remain where they are supposed to be. Below is a detailed look at the engines with which this O Ring Seal is compatible.

ISB Series Engines

• 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 Series Engines

• ISBE CM2150
• ISBE4 CM850

ISC Series Engines

• ISC CM2150
• ISC CM850
• ISC8.3 CM2250

ISL Series Engines

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

ISF Series Engines

• ISF3.8 CM2220 AN

ISD Series Engines

• ISD4.5 CM2220 D108

QSB Series Engines

• QSB4.5 CM2250 EC

B Series Engines

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

This O Ring Seal is designed to fit snugly within the specified engine models, ensuring that it can effectively prevent leaks and maintain the operational efficiency of the engine. Its compatibility across multiple engine series highlights its versatility and importance in the maintenance and repair of Cummins engines.

Role of Part 3947269 O Ring Seal in Engine Systems

Part 3947269 O Ring Seal 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 Electronic Fuel Control Actuator and Fuel Actuator Kit, the O Ring Seal is utilized to create a tight seal between moving parts and the actuator housing. This ensures that fuel delivery is precise and free from leaks, which is vital for maintaining the correct fuel-air mixture and engine performance.

The Fuel Injection Pump relies on the O Ring Seal to maintain pressure within the system. By sealing the connections between the pump and its various components, the seal prevents fuel leakage and ensures that the pump operates efficiently, delivering fuel at the correct pressure and timing.

Fuel Pump and Related Components

For the Fuel Pump, Fuel Pump Adapter, Fuel Pump Assembly, and Fuel Pump Kit, the O Ring Seal is critical in sealing the connections to the fuel lines and the engine. This prevents fuel from escaping and ensures that the pump can draw fuel effectively from the tank, maintaining consistent fuel pressure throughout the system.

The Fuel Pump Mounting also benefits from the O Ring Seal, as it ensures that the pump is securely attached to the engine without any fuel leaks. This is particularly important in high-pressure fuel systems where even a small leak can lead to significant performance issues.

Pressure Regulation and Service Kits

In the Pressure Regulator Valve, the O Ring Seal helps maintain the desired fuel pressure by sealing the valve’s moving parts. This ensures that the regulator can accurately control fuel pressure, which is essential for optimal engine operation.

The Service Kit often includes O Ring Seals to replace worn or damaged seals during maintenance. This ensures that all connections remain sealed, preventing leaks and maintaining the efficiency of the fuel system.

XPI JV Components and Cummins MR System

For the XPI JV Components and the XPI JV System Cummins MR, the O Ring Seal is used extensively to seal the high-pressure fuel lines and connections. This is vital in these systems, where fuel is delivered at very high pressures. The seal ensures that fuel is delivered efficiently to the injectors, enhancing combustion and overall engine performance.

Lower Engine Gasket Kit

In the Lower Engine Gasket Kit, the O Ring Seal is used to ensure that there are no leaks between the lower engine components and the fuel system. This is important for maintaining the integrity of the engine’s fuel supply and preventing any potential fuel leaks that could lead to safety hazards or performance issues.

Conclusion

Overall, the 3947269 O Ring Seal plays a significant role in maintaining the efficiency and reliability of various engine systems by ensuring that all connections are sealed properly, preventing leaks, and maintaining the correct fuel pressure and delivery.