3420872
Thermostat
Cummins®

Introduction

The Cummins 3420872 Thermostat is a component designed for use in commercial trucks, specifically within their engine cooling systems. Its purpose is to regulate the engine’s temperature, ensuring it operates within a specified range for optimal performance and longevity. This thermostat is integral to maintaining the engine’s efficiency and reliability under various operating conditions.

Basic Concepts of a Thermostat

A thermostat is a device that senses the temperature of a system and performs actions to maintain the temperature within a set range. In an engine cooling system, the thermostat controls the flow of coolant between the engine and the radiator. When the engine is cold, the thermostat remains closed, preventing coolant flow to the radiator and allowing the engine to warm up quickly. As the engine temperature rises, the thermostat opens, allowing coolant to circulate through the radiator, where it is cooled before returning to the engine ¹.

Purpose of the Cummins 3420872 Thermostat

The Cummins 3420872 Thermostat plays a role in maintaining optimal engine temperature in commercial trucks by regulating the flow of coolant. It ensures that the engine reaches its operating temperature quickly and maintains this temperature, regardless of external conditions. This regulation is vital for engine efficiency, as it allows the engine to operate at its most efficient temperature, reducing wear and improving fuel economy ².

Key Features

The Cummins 3420872 Thermostat is characterized by several design elements and materials that enhance its performance. It is constructed from durable materials to withstand the high temperatures and pressures within the engine cooling system. The thermostat features a precise temperature-sensitive valve that opens and closes at specific temperatures, ensuring accurate temperature control. Additionally, it is designed to be compatible with a range of commercial truck models, offering versatility in application.

Benefits

The advantages provided by the Cummins 3420872 Thermostat include improved engine efficiency, longevity, and reliability. By maintaining optimal engine temperature, it contributes to more efficient combustion, reducing fuel consumption. The thermostat’s durable construction and precise temperature control enhance the engine’s longevity and reliability, even under demanding operating conditions ³.

Installation and Compatibility

Proper installation of the Cummins 3420872 Thermostat is crucial for its effective operation. Installation procedures may vary slightly depending on the specific truck model, but generally involve removing the old thermostat, cleaning the housing, and installing the new thermostat with the appropriate gasket. It is important to follow manufacturer guidelines to ensure compatibility and proper function.

Maintenance and Troubleshooting

Routine maintenance practices for the Cummins 3420872 Thermostat include regular inspection for signs of wear or damage and ensuring it operates within the specified temperature range. Common troubleshooting tips involve checking for proper installation, ensuring the thermostat opens and closes at the correct temperatures, and verifying there are no obstructions in the coolant flow. Addressing these issues promptly can prevent more significant problems and ensure the thermostat’s longevity.

Performance in Various Conditions

The Cummins 3420872 Thermostat is designed to perform reliably under a wide range of environmental and operational conditions. Its adaptability ensures that the engine maintains optimal temperature, whether operating in extreme heat, cold, or varying load conditions. This reliability is crucial for the consistent performance and longevity of commercial trucks.

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 a strong reputation in the industry, Cummins is committed to producing high-quality automotive components that meet the demanding requirements of commercial applications. The company’s focus on quality, performance, and reliability is evident in its wide range of products, including the Cummins 3420872 Thermostat.

Compatibility with Cummins Engines

The thermostat part number 3420872, manufactured by Cummins, is designed to fit seamlessly with a variety of Cummins engines. This part is crucial for maintaining optimal engine temperature, ensuring efficient operation and longevity of the engine.

QSV81G and QSV91G Engines

The thermostat 3420872 is compatible with the QSV81G and QSV91G engines. These engines benefit from the precise temperature regulation provided by this thermostat, ensuring that the engine operates within its optimal thermal range. This compatibility ensures that both the QSV81G and QSV91G engines maintain efficient performance and reliability.

QSW/QSV82 and QSW27 Engines

The thermostat part number 3420872 is also suitable for the QSW/QSV82 and QSW27 engines. These engines are designed for heavy-duty applications, and the thermostat plays a critical role in managing the engine’s temperature under demanding conditions. The compatibility with these engines ensures that they can handle high loads and maintain consistent performance.

QSW36 and QSW73 Engines

Finally, the thermostat 3420872 is also designed to fit the QSW36 and QSW73 engines. These engines are known for their robust performance and durability. The thermostat ensures that these engines operate efficiently by maintaining the correct temperature, which is essential for their longevity and reliability in various applications.

By ensuring compatibility with these engines, the thermostat 3420872 from Cummins provides a reliable solution for temperature management, enhancing the overall performance and lifespan of the engines.

Role of Part 3420872 Thermostat in Engine Systems

The part 3420872 thermostat is an essential component in maintaining the optimal operating temperature of engine systems. It works in conjunction with various assemblies and modules to ensure efficient engine performance and longevity.

Integration with Lubricating Oil Systems

In lubricating oil assemblies, the thermostat plays a significant role by regulating the flow of oil based on the engine’s temperature. When the engine is cold, the thermostat restricts oil flow to the cooler, allowing the engine to warm up quickly. As the engine reaches its operating temperature, the thermostat opens, allowing oil to flow through the cooler, which helps in dissipating heat and maintaining a consistent oil temperature. This is particularly important in the Lubricating Oil Module Assembly and the Oil Assembly Cooler, where precise temperature control is necessary to prevent oil degradation and ensure proper lubrication.

Interaction with Engine Oil Coolers

The thermostat is also integral to the function of engine oil coolers. In systems like the Engine Oil Cooler and the Oil Cooler Assembly, the thermostat ensures that the oil is only cooled when necessary. This prevents the engine from operating in an overly cooled state, which can lead to increased wear and reduced efficiency. The thermostat’s ability to modulate oil flow through the cooler is vital for maintaining the engine’s thermal balance.

Coordination with Thermostat Housing and Equipment

The thermostat is housed within the Thermostat Housing Cover and Thermostat Equipment Housing, which are designed to protect the thermostat and facilitate its operation. These housings are engineered to withstand the high temperatures and pressures within the engine compartment, ensuring the thermostat functions reliably over time. The Thermostat Assembly Holder further secures the thermostat in place, allowing for easy installation and replacement when needed.

Role in Assembly Coolers

In assembly coolers, such as the Assembly Cooler and Oil Cooler, the thermostat helps manage the cooling process by controlling the flow of coolant. This is especially important in high-performance engines where maintaining optimal operating temperatures is key to performance and durability. The thermostat ensures that the coolant only flows through the cooler when the engine temperature exceeds a certain threshold, thereby optimizing the cooling process and enhancing engine efficiency.

Function in Lom Fee and Lom Fwe Assemblies

In the Lom Fee and Lom Fwe assemblies, the thermostat contributes to the overall thermal management of the engine. These assemblies often include multiple cooling circuits, and the thermostat helps to balance the flow of coolant and oil to prevent overheating and ensure consistent performance. By integrating with these complex systems, the thermostat plays a vital role in the engine’s thermal regulation.

Conclusion

In summary, the part 3420872 thermostat is a key component in the thermal management of engine systems. Its ability to regulate the flow of oil and coolant through various assemblies and coolers ensures that the engine operates within its optimal temperature range, contributing to enhanced performance, efficiency, and longevity.