3945254
Filler Cap
Cummins®

The Cummins 3945254 Filler Cap is a component designed for use in the fueling systems of commercial trucks. Its role is to facilitate the addition of fuel to the vehicle’s tank while also preventing contamination and ensuring the integrity of the fuel system. This part is significant in the operation of commercial trucks, contributing to efficient and safe fueling processes ¹.

Purpose and Function

The Cummins 3945254 Filler Cap serves a dual purpose in the fueling system of a truck. It allows for the addition of fuel to the tank through a secure and controlled process. Additionally, it incorporates mechanisms to prevent contaminants from entering the fuel system, which helps maintain the quality of the fuel and the efficiency of the engine. By sealing the fuel tank, it also plays a role in maintaining the pressure within the tank, which is important for the proper operation of the fuel system ².

Key Features

The design and construction of the Cummins 3945254 Filler Cap include several features that enhance its performance and durability. It is typically made from materials that are resistant to corrosion and wear, ensuring longevity in various operating conditions. The cap includes a sealing mechanism, often a gasket or O-ring, that creates a tight seal when the cap is in place, preventing fuel leaks and the ingress of contaminants. Additionally, the cap may feature a venting system that allows for the safe release of pressure build-up within the fuel tank ³.

Benefits

The Cummins 3945254 Filler Cap offers several advantages. It contributes to the integrity of the fuel system by providing a secure seal and preventing contamination. The ease of use is another benefit, as the cap is designed for quick and straightforward operation during fueling. Over time, the durability and reliability of the cap can lead to long-term cost savings by reducing the need for frequent replacements or repairs.

Installation and Usage

Proper installation of the Cummins 3945254 Filler Cap involves ensuring that the cap is correctly aligned with the fuel tank opening and that the sealing mechanism is in good condition. The cap should be tightened to the manufacturer’s specified torque to ensure a secure fit without over-tightening, which could damage the cap or the tank. Users should follow any specific instructions provided by Cummins for the installation and operation of the cap to ensure optimal performance.

Maintenance and Troubleshooting

To maintain the Cummins 3945254 Filler Cap, regular inspection routines should be established. This includes checking the condition of the sealing mechanism for signs of wear or damage and ensuring that the cap is securely fastened after each use. Common troubleshooting steps for issues such as leaks or difficulty in operation may involve inspecting the cap for debris, ensuring the sealing mechanism is intact, and verifying that the cap is properly installed.

Safety Considerations

When handling and maintaining the Cummins 3945254 Filler Cap, it is important to observe safety practices. This includes being aware of the potential hazards associated with fuel, such as flammability and the risk of spills. Proper handling techniques should be employed, and any maintenance should be performed in a well-ventilated area away from ignition sources. Additionally, users should be familiar with the safety features of the cap, such as any pressure release mechanisms, and use them as intended.

Environmental Impact

The design and function of the Cummins 3945254 Filler Cap contribute to reducing environmental risks associated with fueling operations. By providing a secure seal and preventing fuel spills and contamination, it helps protect the environment from the harmful effects of fuel leaks. Additionally, the cap’s role in maintaining the integrity of the fuel system can lead to more efficient engine operation, potentially reducing emissions over time.

Cummins 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 is committed to innovation and quality in the commercial truck industry. The company’s product range includes a variety of components and systems designed to enhance the performance, efficiency, and reliability of commercial vehicles.

Cummins Engine Filler Cap Compatibility

The Cummins part 3945254, a filler cap, is designed to fit a variety of Cummins engines. This filler cap is an essential component for maintaining the integrity of the engine’s fuel system by preventing contaminants from entering and ensuring proper fuel management.

ISB CM550 and QSB5.9 44 CM550

The filler cap 3945254 is compatible with the ISB CM550 and QSB5.9 44 CM550 engines. These engines are known for their robust performance and reliability, often used in heavy-duty applications. The filler cap ensures that the fuel system remains sealed and protected, contributing to the engine’s longevity and efficiency.

ISBE CM800

The ISBE CM800 engine also utilizes the filler cap 3945254. This engine is typically found in industrial and marine applications, where durability and performance are critical. The filler cap plays a role in maintaining the engine’s operational standards by preventing external elements from compromising the fuel system.

ISC CM554, ISL CM554, QSC8.3 CM554, and QSL9 CM554

The filler cap 3945254 is also suitable for the ISC CM554, ISL CM554, QSC8.3 CM554, and QSL9 CM554 engines. These engines are part of Cummins’ lineup of high-performance diesel engines, often used in various applications ranging from construction to transportation. The filler cap ensures that these engines maintain optimal fuel system integrity, which is vital for their demanding operational environments.

By using the filler cap 3945254, owners and operators of these engines can be confident that their fuel systems are protected, contributing to the overall reliability and performance of the engines.

Role of Part 3945254 Filler Cap in Engine Systems

The 3945254 Filler Cap is a component in the arrangement of various engine systems, ensuring the seamless operation and maintenance of these systems.

In the oil fill system, the 3945254 Filler Cap serves as the primary access point for adding oil to the engine. It is designed to create a secure seal, preventing oil leaks and contamination. This cap is engineered to withstand the pressures and temperatures within the oil system, ensuring that the oil remains clean and at the appropriate level for optimal engine performance.

When considering the cover components, the 3945254 Filler Cap interacts directly with the valve cover. The valve cover protects the valve train components and helps maintain a clean environment for the valves and camshaft. The filler cap must fit precisely with the valve cover to ensure that no oil escapes and that the cover remains intact under operating conditions.

In conjunction with the valve system, the 3945254 Filler Cap plays a supporting role by ensuring that the oil supply to the valve train is consistent and uncontaminated. Proper oil levels and quality are vital for the lubrication of valves, which in turn affects their durability and efficiency.

Overall, the 3945254 Filler Cap is integral to the maintenance and efficiency of the engine’s oil system, working in harmony with the oil fill, cover, and valve components to ensure the engine operates smoothly and reliably.

Conclusion

The Cummins 3945254 Filler Cap is a critical component in the fueling and oil systems of commercial trucks and engines. Its design and features contribute to the integrity, efficiency, and safety of these systems. Proper installation, maintenance, and usage of this part are essential for optimal performance and longevity of the vehicle’s engine and fuel system.