4990174
Plain Hexagon Nipple
Cummins®

Introduction

The Cummins 4990174 Expansion Plug is a component designed for use in heavy-duty truck systems. Its purpose is to seal openings in various parts of the truck, ensuring the integrity of the system it is installed in. This plug plays a role in maintaining the operational efficiency of the truck by preventing leaks and ensuring that fluids remain within their designated pathways.

Basic Concepts of Expansion Plugs

An expansion plug is a type of fastener that expands when inserted into a hole, creating a secure seal. It functions by utilizing the natural properties of materials to expand under certain conditions, such as when pressure is applied or when it is heated. In automotive systems, expansion plugs are commonly used to seal openings in engine blocks, transmission cases, and other components where a tight seal is necessary to prevent fluid leaks and maintain system pressure ¹.

Purpose of the Cummins 4990174 Expansion Plug

The Cummins 4990174 Expansion Plug serves a specific role in the operation of a truck, primarily within the engine or cooling system. It is designed to seal openings that may be present after manufacturing or repair processes. By doing so, it helps maintain the integrity of the cooling system, ensuring that coolant remains within the system and does not leak out, which could lead to engine overheating and potential damage.

Key Features

The Cummins 4990174 Expansion Plug is characterized by several main features that enhance its performance. It is typically made from high-quality materials that can withstand the high temperatures and pressures found in heavy-duty truck engines. Its design includes elements that allow it to expand securely within the hole it is installed in, providing a reliable seal. Additionally, it may feature unique attributes such as a corrosion-resistant coating to prolong its lifespan and ensure consistent performance ².

Benefits

Using the Cummins 4990174 Expansion Plug offers several advantages. It contributes to improved system integrity by providing a secure seal that prevents leaks. This, in turn, enhances the overall performance of the truck by ensuring that the cooling system operates efficiently. Furthermore, the plug’s durable construction and design elements contribute to its longevity, making it a cost-effective solution for sealing applications in heavy-duty trucks.

Installation Process

Installing the Cummins 4990174 Expansion Plug requires following a specific procedure to ensure a proper seal. The process typically involves cleaning the hole to be sealed, inserting the plug, and then using a tool to expand it until it securely fits within the hole. Careful attention to the manufacturer’s instructions is important to achieve the best results and ensure the plug functions as intended ³.

Troubleshooting and Maintenance

Common issues with expansion plugs may include improper sealing, which can lead to leaks. Diagnosing problems often involves inspecting the plug and the area around it for signs of leakage or damage. Maintenance tips include regularly checking the condition of the plug and replacing it if signs of wear or damage are observed. Proper installation and occasional inspection can help ensure optimal performance and longevity of the expansion plug.

Compatibility and Usage

The Cummins 4990174 Expansion Plug is designed for use in specific types of trucks and engine models. It is important to consult the manufacturer’s guidelines for compatibility information to ensure the plug is suitable for the intended application. Specific installation considerations may include the size of the hole to be sealed and the material of the surrounding components.

Safety Considerations

When handling and installing the Cummins 4990174 Expansion Plug, it is important to observe safety practices. This includes wearing appropriate personal protective equipment, such as gloves and safety glasses, to protect against injury. Additionally, ensuring the truck is properly supported and the engine is cool before beginning work can help prevent accidents and ensure a safe working environment.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a strong reputation in the automotive industry, particularly in the heavy-duty truck sector, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and history of excellence make it a trusted name in the industry.

Compatibility of Cummins Expansion Plug 4990174 with Various Engine Models

The Cummins Expansion Plug part number 4990174 is designed to fit a variety of engine models, ensuring compatibility across different engine configurations. Here is a detailed overview of its application across various engine types:

Cummins B and ISB Series Engines

• 4B3.9
• 6B5.9
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB5.9

These engines, part of the B and ISB series, are equipped with the 5.9-liter displacement and share a common architecture that allows the 4990174 expansion plug to fit seamlessly. The plug is engineered to handle the thermal expansion and contraction of the engine block, ensuring durability and performance.

Cummins QSB Series Engines

• QSB5.9 CM2880 B115
• QSB5.9G

The QSB series engines, including the 5.9-liter variants, also benefit from the 4990174 expansion plug. This part is specifically designed to fit the unique design of the QSB engines, providing a reliable seal and maintaining the integrity of the engine block under varying operational conditions.

Cummins L Series Engines

• L8.9 L121

The L series engines, such as the L8.9, are equipped with the 4990174 expansion plug to manage the thermal dynamics of the engine. This plug is critical in maintaining the structural integrity of the engine block, ensuring that the engine operates efficiently and reliably.

Cummins B5.6 CM2670 B152B

The B5.6 CM2670 B152B engine, with its 5.6-liter displacement, is another model that utilizes the 4990174 expansion plug. This part is tailored to fit the specific design requirements of this engine, ensuring optimal performance and longevity.

By providing a comprehensive fitment for these various engine models, the Cummins Expansion Plug 4990174 ensures that engine owners can maintain their equipment with confidence, knowing that the part is designed to meet the rigorous demands of their machinery.

Role of Part 4990174 Expansion Plug in Engine Systems

The 4990174 Expansion Plug is a component that significantly contributes to the functionality and safety of various engine systems. Its primary role is to seal and pressurize specific areas within the engine, ensuring optimal performance and preventing potential damage.

Block and Cylinder Block

In the context of the engine block and cylinder block, the 4990174 Expansion Plug is utilized to seal unused or redundant passages. This ensures that the internal pressure within the block is maintained, which is essential for the efficient operation of the engine. By preventing the escape of gases and fluids, the plug helps in maintaining the integrity of the combustion process.

Coupling and Fuel Pump Coupling

When integrated into the coupling and fuel pump coupling systems, the 4990174 Expansion Plug serves to seal any unnecessary openings. This is particularly important in fuel pump couplings where the precise control of fuel flow is necessary. The plug ensures that there are no leaks or unintended pathways for fuel, which could otherwise lead to inefficiencies or hazardous conditions.

Fuel Pump and Pump Systems

In fuel pump and general pump systems, the 4990174 Expansion Plug is employed to block off any non-functional ports or passages. This is vital for maintaining the correct pressure and flow rates within the pump system. By sealing these areas, the plug helps in ensuring that the fuel pump operates within its designed parameters, thereby enhancing the overall efficiency and reliability of the fuel delivery system.

Mounting and Fuel Pump Mounting

For fuel pump mounting applications, the 4990174 Expansion Plug is used to seal any gaps or openings in the mounting structure. This is important for preventing the ingress of contaminants or the egress of fluids, which could compromise the fuel pump’s performance. The plug contributes to a secure and clean mounting environment, which is essential for the long-term operation of the fuel pump.

General Pump Applications

In broader pump applications, the 4990174 Expansion Plug is utilized to seal any unnecessary openings within the pump housing. This ensures that the pump operates under the correct pressure conditions, which is critical for its efficiency and durability. By preventing leaks and maintaining pressure, the plug plays a supportive role in the reliable operation of various pump systems.

Conclusion

The Cummins 4990174 Expansion Plug is a vital component in heavy-duty truck systems, designed to seal openings and maintain system integrity. Its application across various engine models, including the B, ISB, QSB, and L series, underscores its versatility and importance in engine systems. By ensuring proper sealing and pressurization, this part contributes to the efficient and reliable operation of the engine, highlighting its significance in maintaining the performance and safety of heavy-duty trucks.