3960078
Thermostat Housing
Cummins®

The Cummins 3960078 Thermostat Housing is a component designed for use in the engine cooling system of heavy-duty trucks. Its purpose is to facilitate the regulation of engine temperature, ensuring that the engine operates within optimal thermal conditions. This housing is integral to maintaining the efficiency and performance of the engine by managing the flow of coolant in conjunction with the thermostat ¹.

Basic Concepts of Thermostat Housing

A thermostat housing is a part of the engine cooling system that encloses the thermostat. Its function is to provide a secure environment for the thermostat, allowing it to control the flow of coolant between the engine and the radiator. The housing is connected to the engine block and coolant passages, enabling the circulation of coolant as needed to maintain engine temperature. The thermostat within the housing opens and closes in response to temperature changes, regulating coolant flow to prevent overheating or underheating of the engine ².

Purpose of the 3960078 Thermostat Housing

This Cummins part plays a specific role in the operation of a truck engine by ensuring that the engine reaches and maintains its optimal operating temperature. This is achieved through the precise control of coolant flow by the thermostat, which is housed within this component. By maintaining optimal engine temperature, the housing contributes to efficient engine performance, fuel economy, and reduced emissions.

Key Features

This part is constructed from durable materials that are resistant to corrosion and high temperatures, ensuring longevity and reliable performance. Its design includes features such as secure mounting points, precise coolant passage alignment, and a robust seal to prevent leaks. These attributes enhance the housing’s performance and durability, making it suitable for the demanding conditions encountered by heavy-duty trucks.

Benefits

Using this part offers several benefits. It contributes to improved engine efficiency by ensuring that the engine operates at the correct temperature. This housing provides reliable temperature regulation, which is vital for the longevity of engine components. Additionally, its durable construction ensures long-term performance, even under the strenuous conditions typical of heavy-duty truck operations.

Installation Considerations

When installing the 3960078 Thermostat Housing, it is important to follow guidelines and best practices to ensure proper fitment and function. This includes verifying that the housing is compatible with the engine model, ensuring a tight seal to prevent coolant leaks, and correctly positioning the thermostat within the housing. Adhering to these practices will help maintain the integrity of the engine cooling system.

Troubleshooting and Maintenance

Common issues with thermostat housings may include leaks, corrosion, or thermostat malfunction. Diagnostic tips for identifying problems include checking for coolant leaks around the housing, inspecting for signs of corrosion, and monitoring engine temperature for irregularities. Regular maintenance practices, such as inspecting the housing for damage and ensuring the thermostat operates correctly, can prolong the life of the 3960078 Thermostat Housing.

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 quality, Cummins has established a strong reputation 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 heavy-duty vehicles. The 3960078 Thermostat Housing is a testament to Cummins’ commitment to quality and durability in the demanding environment of commercial trucking.

Thermostat Housing 3960078 Compatibility with Cummins Engines

The Thermostat Housing part number 3960078, manufactured by Cummins, is designed to fit a range of Cummins engines. This part is integral to the engine’s cooling system, ensuring that the engine operates within its optimal temperature range.

4B3.9 and 6B5.9 Engines

The Thermostat Housing 3960078 is compatible with the 4B3.9 and 6B5.9 engines. These engines are part of the Cummins B Series, known for their durability and efficiency in various applications. The housing ensures that the thermostat can effectively regulate the coolant flow, maintaining the engine’s temperature.

ISB3.9 CM2220 B107 and ISB5.9 CM2880 B127 Engines

The same part number, 3960078, also fits the ISB3.9 CM2220 B107 and ISB5.9 CM2880 B127 engines. These engines belong to the Cummins ISB Series, which are widely used in both on-highway and off-highway applications. The thermostat housing in these engines plays a crucial role in the cooling system, ensuring efficient operation and longevity of the engine.

The compatibility of the Thermostat Housing 3960078 across these engines highlights its versatility and importance in maintaining the engine’s performance.

Role of Part 3960078 Thermostat Housing in Engine Systems

The thermostat housing, identified by part number 3960078, is an integral component in the thermal management system of an engine. It serves as the enclosure for the thermostat, which regulates the flow of coolant between the engine and the radiator.

When the engine is cold, the thermostat remains closed, preventing coolant from flowing to the radiator. This allows the engine to reach its optimal operating temperature more quickly. Once the engine warms up, the thermostat opens, allowing coolant to circulate through the radiator, where it is cooled before returning to the engine.

The thermostat housing is connected to the engine block via gaskets and bolts, ensuring a secure and leak-free seal. It is also linked to the upper radiator hose, which carries hot coolant from the engine to the radiator. Additionally, the housing may incorporate a temperature sensor, which monitors the coolant temperature and sends data to the engine control unit (ECU).

In summary, the thermostat housing plays a significant role in maintaining the engine’s temperature within a specified range, ensuring efficient operation and preventing overheating.

Conclusion

The Cummins 3960078 Thermostat Housing is a vital component in the engine cooling system of heavy-duty trucks. It ensures that the engine operates within optimal thermal conditions, contributing to efficient performance, fuel economy, and reduced emissions. Constructed from durable materials and designed with key features for longevity and reliability, this part is essential for maintaining the integrity of the engine cooling system. Regular maintenance and proper installation are crucial for maximizing the benefits of this component.