3917968
Expansion Tank
Cummins®

The Cummins 3917968 Expansion Tank is a component designed for use in the cooling systems of heavy-duty trucks. Its purpose is to manage the changes in coolant volume that occur due to temperature fluctuations, thereby contributing to the overall efficiency and reliability of the truck’s cooling system.

Basic Concepts of an Expansion Tank

An expansion tank is a vital component in a vehicle’s cooling system. It functions by providing a reservoir for the coolant as it expands when heated and contracts when cooled. This process is governed by the principles of thermal expansion and contraction ¹. The tank helps maintain the system’s pressure and ensures that the coolant circulates effectively, preventing overheating and system failure.

Purpose of the Cummins 3917968 Expansion Tank

The Cummins 3917968 Expansion Tank plays a role in maintaining the efficiency and reliability of a truck’s cooling system by accommodating changes in coolant volume due to temperature variations. It allows for the safe expansion of coolant without causing excessive pressure within the system, which could lead to leaks or damage to other components. By managing these volume changes, the expansion tank helps to maintain optimal coolant levels and pressure, contributing to consistent engine performance and longevity.

Key Features

The Cummins 3917968 Expansion Tank is constructed from durable materials that are resistant to corrosion and high temperatures, ensuring longevity and reliable performance. Its design includes features that enhance the efficiency of coolant management, such as a robust cap that maintains system pressure and a transparent material that allows for easy visual inspection of coolant levels. Additionally, the tank may incorporate unique attributes that differentiate it from other expansion tanks, such as advanced sealing mechanisms to prevent leaks.

Benefits of Using the Cummins 3917968 Expansion Tank

Utilizing the Cummins 3917968 Expansion Tank offers several advantages. It provides improved coolant management, which is crucial for maintaining the optimal operating temperature of the engine ². This, in turn, enhances the durability of the cooling system and contributes to overall engine performance and longevity. The tank’s design and construction also help to reduce the risk of coolant leaks and system failures, ensuring a more reliable and efficient cooling system.

Installation Considerations

When installing the Cummins 3917968 Expansion Tank, it is important to follow guidelines and best practices to ensure proper integration with the truck’s cooling system. Compatibility with various truck models should be verified prior to installation. The necessary tools and a step-by-step installation process should be followed to ensure that the tank is securely and correctly installed, contributing to the efficiency and reliability of the cooling system.

Maintenance and Troubleshooting

Regular maintenance practices are recommended to ensure the longevity and efficiency of the Cummins 3917968 Expansion Tank. This includes periodic inspections for signs of wear or damage, ensuring that the cap is securely in place, and checking coolant levels. Common issues that may arise include leaks or reduced system pressure, which can often be diagnosed through visual inspection and simple diagnostic tests. Troubleshooting steps may involve tightening connections, replacing worn seals, or addressing coolant leaks promptly to prevent further damage.

Manufacturer Information - Cummins

Cummins Inc. is a well-established company with a strong reputation in the automotive industry, particularly for producing high-quality components for heavy-duty trucks. With a history of innovation and commitment to excellence, Cummins is recognized for its dedication to manufacturing reliable and durable parts that meet the demanding requirements of heavy-duty applications. The company’s expertise and focus on quality ensure that their products, including the Cummins 3917968 Expansion Tank, are designed to deliver performance and reliability in challenging operating conditions.

Compatibility of Cummins Expansion Tank Part 3917968 with Various Engine Models

The Cummins Expansion Tank part number 3917968 is designed to be compatible with a range of Cummins engine models. This part plays a role in maintaining the cooling system’s efficiency by accommodating the thermal expansion of the coolant. Below is a detailed overview of the engines with which this expansion tank part is compatible.

Compatibility with Specific Engine Models

• 4B3.9 and 6B5.9 Engines

The Cummins Expansion Tank part 3917968 is specifically engineered to fit the 4B3.9 and 6B5.9 engines. These engines are known for their robust performance and reliability, often used in various industrial and commercial applications. The expansion tank ensures that the cooling system can handle the thermal stresses and maintain optimal coolant levels.

• QSB6.7, M CM2250, and QSM11 CM570 Engines

The part 3917968 is also compatible with the QSB6.7, M CM2250, and QSM11 CM570 engines. These engines are part of Cummins’ lineup of high-performance diesel engines, often utilized in heavy-duty applications such as construction equipment, agricultural machinery, and marine vessels. The expansion tank is integral to these engines’ cooling systems, providing the necessary flexibility to manage coolant expansion and contraction.

Importance of the Expansion Tank in Engine Performance

The expansion tank is a component in the cooling system of these engines. It helps to:

• Prevent Overheating: By allowing the coolant to expand and contract, the tank prevents the engine from overheating, which can lead to severe damage.
• Maintain Coolant Levels: It ensures that the coolant levels remain consistent, even under varying thermal conditions.
• Reduce Pressure Build-Up: The tank helps to mitigate pressure build-up in the cooling system, which can otherwise lead to leaks and system failures.

By integrating the Cummins Expansion Tank part 3917968 into the cooling systems of these engines, users can expect enhanced reliability and longevity of their equipment.

Role of Part 3917968 Expansion Tank in Engine Systems

The 3917968 Expansion Tank is an integral component in various engine systems, ensuring optimal performance and longevity of the engine. It is particularly significant in the following components:

Heat Exchanger Systems

In heat exchanger systems, the 3917968 Expansion Tank accommodates the expansion and contraction of coolant as it heats up and cools down. This helps maintain consistent pressure within the system, preventing leaks and ensuring efficient heat transfer.

Heat Package Units

When integrated into heat package units, the expansion tank plays a key role in managing the thermal dynamics of the system. It absorbs excess pressure from the heated coolant, which is essential for maintaining the integrity of the heat package and ensuring reliable operation.

Product Installation Processes

During the installation of engine systems, the 3917968 Expansion Tank is connected to the plumbing network. Its proper installation is vital for the system’s pressure regulation, which in turn affects the overall efficiency and safety of the engine.

Plumbing Networks

Within the plumbing network of an engine system, the expansion tank acts as a buffer. It collects excess coolant when the system is pressurized, and releases it back into the system when pressure drops, thus stabilizing the flow and pressure throughout the network.

Keel Cooler Applications

In keel cooler applications, the 3917968 Expansion Tank is essential for managing the coolant’s volume changes. This is particularly important in marine environments where temperature fluctuations can be significant. The tank ensures that the keel cooler operates within safe pressure limits, enhancing the durability and performance of the cooling system.

Conclusion

The Cummins 3917968 Expansion Tank is a critical component in the cooling systems of heavy-duty trucks and various engine models. Its role in managing coolant volume changes, maintaining system pressure, and preventing overheating contributes significantly to the efficiency, reliability, and longevity of the engine. Proper installation, regular maintenance, and understanding its compatibility with specific engine models are essential for maximizing the benefits of this Cummins part.