5255450
Filler Cap Gasket
Cummins®

The Cummins 5255450 Filler Cap Gasket is a component designed for use in the fuel systems of commercial trucks. Its primary role is to ensure a secure seal between the filler cap and the fuel tank, which is vital for the proper operation and safety of the vehicle ².

Purpose and Function

The Cummins 5255450 Filler Cap Gasket plays a role in the fuel system by providing a seal that prevents fuel leakage and contamination. This seal is essential for maintaining the integrity of the fuel system, ensuring that fuel is stored safely and efficiently within the tank. By preventing leaks, the gasket helps to avoid potential hazards such as fuel spills, which can pose safety risks and environmental concerns ³.

Key Features

The Cummins 5255450 Filler Cap Gasket is constructed from materials that offer durability and resistance to the elements commonly encountered in commercial truck operations. Its design includes features that enhance its ability to create a tight seal, even under varying conditions of use. These features contribute to the gasket’s performance and longevity, ensuring it can withstand the demands of heavy-duty applications ¹.

Benefits

Using the Cummins 5255450 Filler Cap Gasket offers several advantages. It contributes to the overall integrity of the fuel system by preventing leaks, which can lead to fuel loss and potential safety hazards. Additionally, by ensuring a secure seal, the gasket helps maintain the cleanliness of the fuel, reducing the risk of contamination that can affect engine performance. Furthermore, its design and material composition enhance the safety and efficiency of the truck’s fuel system ².

Installation and Replacement

Proper installation and replacement of the Cummins 5255450 Filler Cap Gasket involve several steps to ensure it functions correctly. The process requires specific tools and equipment, and safety precautions should be observed to protect against fuel spills and other hazards. Detailed instructions for installation and replacement should be followed to maintain the effectiveness of the fuel system seal ³.

Maintenance Tips

To ensure the optimal performance and longevity of the Cummins 5255450 Filler Cap Gasket, regular maintenance is recommended. This includes inspecting the gasket for signs of wear or damage, cleaning it as necessary, and replacing it when it shows signs of degradation. Adhering to these maintenance practices helps prevent issues such as leaks and ensures the gasket continues to provide a secure seal ¹.

Troubleshooting Common Issues

Common issues associated with the Cummins 5255450 Filler Cap Gasket may include leaks, difficulty in sealing, or gasket degradation. Identifying these problems early can prevent more significant issues down the line. Solutions may involve cleaning the gasket and its mating surfaces, ensuring proper installation, or replacing the gasket if it is worn or damaged. Preventive measures, such as regular inspections and maintenance, can help avoid these common problems ².

Safety Considerations

A faulty or improperly installed filler cap gasket can lead to safety implications, including fuel leaks, which may result in fires or environmental contamination. It is important to follow safety protocols and best practices when installing or replacing the gasket to mitigate these risks. This includes ensuring the gasket is correctly installed and maintained to prevent any potential hazards associated with fuel system leaks ³.

Cummins 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 commercial, industrial, and automotive markets. The company’s product range includes engines and components designed for durability, efficiency, and performance in various applications, reflecting Cummins’ dedication to advancing technology and meeting the needs of its customers ¹.

Cummins Engine Part 5255450: Filler Cap Gasket Compatibility

The Cummins part number 5255450, a Filler Cap Gasket, is designed to fit a variety of Cummins engines. This gasket ensures a proper seal between the filler cap and the engine’s fuel tank or oil compartment, preventing leaks and maintaining the integrity of the system. Below is a breakdown of the engines compatible with this part, grouped by engine series for clarity.

ISB Series Engines

• ISB CM2150
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB6.7 CM2250
• ISB6.7 G CM2180 B118

ISBE Series Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

ISB/ISD Series Engines

• ISD4.5 CM2220 D108

QSB Series Engines

• QSB4.5 CM2250 EC
• QSB4.5 CM850 (CM2850)
• QSB5.9 CM2880 B115
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

Other Cummins Engines

• 15N CM2380 M104B
• B4.5 RGT
• B5.6 CM2670 B152B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125
• ISG12 G CMOH6.0 G111

This filler cap gasket is engineered to provide a reliable seal for the specified engines, ensuring optimal performance and longevity. It is essential to use the correct gasket for each engine model to maintain system integrity and prevent leaks ¹.

Role of Part 5255450 Filler Cap Gasket in Engine Systems

The part 5255450 Filler Cap Gasket is an essential component in maintaining the integrity and functionality of various engine systems. Its primary role is to ensure a secure seal between the filler cap and the engine, preventing leaks and maintaining pressure within the system.

Integration with Engine Components

1. Valve Cover and Filler Cap Arrangement:

   • The Filler Cap Gasket is positioned between the filler cap and the valve cover. This arrangement is vital for sealing the opening through which oil is added to the engine. The gasket ensures that no oil escapes from this point, which is particularly important during engine operation when pressures and temperatures are high.

2. Long Block Assembly:

   • In the context of a long block, which includes the cylinder block, crankshaft, pistons, and other core components, the Filler Cap Gasket plays a supportive role. Although it is not a primary component of the long block, its proper installation is necessary to ensure that the engine’s lubrication system functions correctly.

3. Upper Engine Gasket Kit:

   • When utilizing an upper engine gasket kit, the Filler Cap Gasket is often included to replace the existing gasket. This ensures that all sealing surfaces are fresh and capable of withstanding the operational stresses of the engine. The kit may also include other gaskets for the valve cover, ensuring a comprehensive seal across the upper portion of the engine.

4. Overhaul Kit:

   • In an overhaul kit, the Filler Cap Gasket is a small but significant part. Overhaul kits are designed to refresh and repair various engine components, and including the Filler Cap Gasket in such a kit underscores its importance in maintaining the engine’s overall health and performance.

5. Valve and Cover Interaction:

   • The interaction between the valve cover and the filler cap is seamless due to the Filler Cap Gasket. This component ensures that the valve cover remains securely sealed, preventing any oil from escaping and contaminants from entering the engine.

In summary, the part 5255450 Filler Cap Gasket is a fundamental element in the maintenance and operation of engine systems, ensuring that the lubrication process is efficient and leak-free ².

Conclusion

The Cummins 5255450 Filler Cap Gasket is a critical component in the fuel systems of commercial trucks, ensuring a secure seal between the filler cap and the fuel tank. Its role in preventing leaks and maintaining the integrity of the fuel system is essential for the safety and efficiency of the vehicle. Regular maintenance, proper installation, and adherence to safety protocols are necessary to ensure the optimal performance and longevity of this Cummins part ³.