5255448
Filler Cap
Cummins®

Introduction

The Cummins 5255448 Filler Cap is a component designed for use in Cummins-powered commercial trucks. It plays a role in the vehicle’s fueling system by providing a secure and efficient means to refuel the engine. This cap ensures that the fueling process is straightforward and that the fuel system remains sealed and protected from contaminants.

Basic Concepts of Filler Caps

A filler cap is a device used to seal the opening of a fuel tank in a vehicle. Its primary function is to allow fuel to be added to the tank while preventing spills, leaks, and the ingress of contaminants such as dirt, water, and debris. Filler caps are typically constructed from durable materials like metal or high-strength plastic to withstand the rigors of regular use and exposure to fuel. They often incorporate sealing mechanisms, such as gaskets or O-rings, to ensure a tight seal when closed ¹.

Purpose and Function of the 5255448 Filler Cap

The Cummins 5255448 Filler Cap is specifically engineered to fit the fueling systems of Cummins engines found in commercial trucks. It facilitates the refueling process by providing a secure point of entry for the fuel nozzle. Additionally, it maintains the integrity of the fuel system by sealing the tank when not in use, thus preventing fuel evaporation and contamination. The design of this filler cap ensures that it can handle the high volumes of fuel typically required for commercial trucks, while also providing a user-friendly experience during refueling ².

Key Features

The Cummins 5255448 Filler Cap boasts several key features that enhance its performance and durability. Its design is tailored to fit snugly on Cummins fuel tanks, ensuring a secure fit. The cap is made from materials that are resistant to wear, corrosion, and the chemical effects of fuel. It incorporates robust sealing mechanisms to maintain a tight seal, preventing fuel leaks and the entry of contaminants. Additionally, the cap may feature unique attributes such as an ergonomic design for ease of use or a locking mechanism to deter unauthorized access ³.

Benefits

Utilizing the Cummins 5255448 Filler Cap offers several advantages. It enhances the security of the fuel system by providing a reliable seal against leaks and contamination. The cap’s design facilitates ease of use during refueling, reducing the risk of spills and making the process more efficient. Its durability and resistance to wear and environmental factors ensure long-term performance, minimizing the need for frequent replacements. Furthermore, the cap’s compatibility with Cummins engines ensures optimal fit and function, contributing to the overall efficiency and reliability of the vehicle’s fueling system.

Troubleshooting and Maintenance

Common issues with filler caps may include leaks, difficulty in opening, or damage to the sealing mechanisms. To address these problems, it is advisable to inspect the cap regularly for signs of wear or damage. Cleaning the cap and its sealing surfaces can help maintain a good seal. If the cap becomes difficult to open, checking for obstructions or seizing mechanisms may be necessary. Regular maintenance, such as lubricating moving parts and ensuring the cap is properly seated, can help ensure the longevity and proper function of the Cummins 5255448 Filler Cap.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history of innovation and quality, Cummins has established a strong reputation in the commercial truck industry. The company is committed to delivering reliable, efficient, and durable components that meet the demanding requirements of commercial applications. Cummins’ dedication to quality and innovation is evident in its wide range of products, including the Cummins 5255448 Filler Cap, which is designed to enhance the performance and reliability of Cummins-powered trucks.

Cummins Engine Part 5255448: Filler Cap Compatibility

The Cummins part number 5255448, a Filler Cap, is designed to fit a variety of Cummins engines. This filler cap is a component for maintaining the integrity of the engine’s fuel or coolant systems. Below is a detailed description of the compatibility of this filler cap with various Cummins engines.

Compatibility with Specific Engine Models

1. 15N CM2380 M104B
2. B4.5 RGT
3. B5.6 CM2670 B152B
4. B6.7 CM2670 B153B
5. B6.7 CM2670 B164C
6. B6.7 G CMOH6.0 B125
7. ISB CM2150
8. ISB/ISD4.5 CM2150 B119
9. ISB/ISD6.7 CM2150 SN
10. ISB5.9 CM2880 B110
11. ISB5.9 CM2880 B140
12. ISB5.9 CM2880 B149
13. ISB6.7 CM2250
14. ISB6.7 G CM2180 B118
15. ISBE CM2150
16. ISBE CM800
17. ISBE4 CM850
18. ISD4.5 CM2220 D108
19. ISG12 G CMOH6.0 G111
20. QSB4.5 CM2250 EC
21. QSB4.5 CM850(CM2850)
22. QSB5.9 CM2880 B115
23. QSB6.7 CM2250
24. QSB6.7 CM850(CM2850)
25. QSB7 CM2880 B117

Grouping by Engine Series

• ISB Series

  • 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

• QSB Series

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

• ISBE Series

  • ISBE CM2150
  • ISBE CM800
  • ISBE4 CM850

• ISD Series

  • ISD4.5 CM2220 D108

• ISG Series

  • ISG12 G CMOH6.0 G111

• Other Models

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

This filler cap is engineered to ensure a secure and leak-proof seal, which is important for maintaining the engine’s operational efficiency and preventing contamination. It is important to use the correct filler cap for each engine model to ensure compatibility and proper function.

Role of Part 5255448 Filler Cap in Engine Systems

The part 5255448 Filler Cap is a component in the operation and maintenance of various engine systems. It is specifically designed to interface with the long block, valve cover, and valve cover arrangement, ensuring the efficient and secure transfer of fluids within the engine.

Integration with the Long Block

When installed on the long block, the filler cap provides a sealed point of entry for adding or replenishing engine oil. This is vital for maintaining the proper lubrication levels within the engine, which is necessary for the smooth operation of moving parts and the reduction of friction and wear.

Function within the Valve Cover Arrangement

In the context of the valve cover arrangement, the filler cap serves as a critical access point. It allows for the inspection and addition of oil to the valve train components. Proper lubrication is essential here to ensure that the camshaft, lifters, and rocker arms operate without excessive friction, which could lead to premature wear or failure.

Role in the Valve Cover

The valve cover itself is a protective enclosure that houses the valve train components. The filler cap, when fitted to the valve cover, must create a tight seal to prevent oil leaks and contamination. It also allows for the release of pressure that may build up within the valve cover, which is important for maintaining a stable operating environment for the valve train.

Conclusion

In summary, the Cummins 5255448 Filler Cap is a component that facilitates the maintenance and operational integrity of the engine’s lubrication system. Its proper function is interdependent with the long block, valve cover, and valve cover arrangement, ensuring that the engine remains well-lubricated and operates efficiently.