4994574
O Ring Seal
Cummins®

Introduction

The Cummins 4994574 O Ring Seal is a component designed for use in commercial trucks. Its purpose is to provide a reliable seal in various applications within the truck’s systems. This seal is integral to maintaining the integrity of fluid systems, ensuring that fluids remain contained within their designated pathways without leakage ¹.

Basic Concepts of O Ring Seals

An O Ring Seal is a type of gasket with a circular cross-section, designed to create a seal between two or more parts. It functions by being compressed within a groove, creating a barrier that prevents the passage of fluids or gases. O Ring Seals are widely used in mechanical systems due to their simplicity, effectiveness, and versatility. They are commonly made from materials such as nitrile rubber, fluorocarbon, and silicone, each offering different properties like resistance to chemicals, temperature, and compression set ².

Role of the 4994574 O Ring Seal in Truck Operation

The Cummins 4994574 O Ring Seal plays a specific role in the operation of a truck by ensuring the integrity of seals in various systems or components. It is associated with fluid systems where it helps maintain pressure and prevent leaks. By doing so, it contributes to the efficient operation of the truck’s systems, ensuring that fluids are delivered where needed without loss ¹.

Key Features

The Cummins 4994574 O Ring Seal is characterized by its design and material composition. It is crafted from materials that offer durability and resistance to the operating conditions found in commercial trucks. Its design ensures a snug fit within the designated grooves, enhancing its sealing capabilities. Unique characteristics may include specific durometer ratings for optimal compression and sealing efficiency, as well as resistance to the chemicals and temperatures encountered in truck operations ².

Benefits

Using the Cummins 4994574 O Ring Seal offers several benefits. It provides improved sealing efficiency, ensuring that fluids remain contained within their systems. Its durability allows it to withstand the rigors of truck operation, including exposure to high temperatures and chemical environments. Additionally, its resistance to various operating conditions contributes to the longevity and reliability of the truck’s systems ¹.

Troubleshooting and Maintenance

Identifying common issues with O Ring Seals, such as leaks or failures, is important for maintaining the efficiency of a truck’s systems. Regular inspection and replacement of seals according to the manufacturer’s recommendations can help prevent issues. Maintenance practices should include checking for signs of wear or damage, ensuring proper installation, and using the correct seals for specific applications to ensure longevity and optimal performance ².

Compatibility with Cummins Engines

The 4994574 O Ring Seal is designed to fit a variety of Cummins engines. This seal is crucial for maintaining the integrity of various engine components by preventing leaks and ensuring a tight seal where needed. Here is a detailed look at the compatibility of this seal with different Cummins engine models:

B Series Engines

• B4.5 CM2350 B129B
• B6.7 CM2350 B135B
• B6.7 G CMOH6.0 B125

D Series Engines

• D4.0 CM2620 D103B

F Series Engines

• F2.8 CM2620 F135B
• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

ISB/ISD Series Engines

• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISD4.5 CM2220 D108

ISB Engines

• ISB4.5 CM2350 B104
• ISB6.7 G CM2180 B118

ISBE Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

ISF Engines

• ISF2.8 CM2220 F129
• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103
• ISF3.8 CM2350 F109
• ISF4.5 CM2220 F123

ISG Engine

• ISG11 CM2880 G108

This O Ring Seal is engineered to provide a reliable seal in various engine configurations, ensuring optimal performance and longevity of the engine components it protects ¹.

Role of Part 4994574 O Ring Seal in Engine Systems

The 4994574 O Ring Seal is an essential component in ensuring the efficient and reliable operation of various engine systems. Its primary function is to create a secure seal between mating surfaces, preventing leaks and maintaining system integrity.

Compressor and Air Systems

In compressor systems, the 4994574 O Ring Seal is used to seal connections between the compressor and its housing. This ensures that compressed air is efficiently delivered without any loss of pressure. Similarly, in air systems, the seal prevents air leaks, which is vital for maintaining consistent air pressure and flow.

Cylinder Block and Fuel Pump Adapter

When installed in the cylinder block, the O Ring Seal ensures that coolant and lubricants do not leak out, which is essential for maintaining optimal engine temperature and reducing friction. In the fuel pump adapter, the seal prevents fuel leaks, ensuring that the fuel system operates efficiently and safely.

Gauge and Oil Level Systems

For gauges, such as oil pressure and temperature gauges, the 4994574 O Ring Seal ensures accurate readings by preventing any fluid leaks around the sensor connections. In oil level systems, the seal maintains the integrity of the oil level sensor, ensuring precise oil level indications.

Lower and Upper Engine Gasket Kits

In both lower and upper engine gasket kits, the O Ring Seal is used to create a tight seal between various engine components. This is important for preventing coolant, oil, and other fluids from leaking, which could lead to engine damage and reduced performance.

Oil Gauge Tube and Auxiliary Pump Systems

The seal is also critical in the oil gauge tube, where it ensures that oil pressure readings are accurate by preventing oil leaks around the gauge connection. In auxiliary pump systems, whether for fuel or vacuum, the O Ring Seal ensures that the pump operates efficiently without any fluid loss.

Fuel and Vacuum Pump Systems

In fuel pump systems, the 4994574 O Ring Seal ensures that fuel is delivered without leaks, maintaining the efficiency and safety of the fuel system. For vacuum pumps, the seal prevents air leaks, which is essential for maintaining the required vacuum levels for various engine functions.

The 4994574 O Ring Seal plays a significant role in the reliable operation of these engine systems by ensuring secure seals and preventing fluid leaks, thereby contributing to the overall efficiency and safety of the engine ².

Conclusion

The Cummins 4994574 O Ring Seal is a critical component in the maintenance and operation of commercial trucks and various Cummins engines. Its role in preventing leaks and ensuring the integrity of fluid systems contributes to the efficient and reliable performance of these vehicles. Regular maintenance and proper installation of this seal are essential for the longevity and optimal operation of the truck’s systems.