3919015
Thermostat
Cummins®

The Cummins 3919015 Thermostat is a component designed for use in commercial trucks, playing a significant role in the engine’s cooling system. Its primary function is to regulate the engine’s temperature, ensuring it operates within a specified range for optimal performance and longevity.

Basic Concepts of a Thermostat

A thermostat is a device that senses the temperature of a system and controls the flow of heat to maintain the system at or near a desired setpoint. In an engine cooling system, the thermostat regulates the flow of coolant between the engine and the radiator. When the engine is cold, the thermostat remains closed, preventing coolant flow and allowing the engine to warm up quickly. As the engine temperature rises, the thermostat opens, allowing coolant to circulate and absorb excess heat, which is then dissipated through the radiator ¹.

Purpose of the Cummins 3919015 Thermostat

This Cummins part is integral to maintaining the optimal operating temperature of the engine. By regulating the flow of coolant, it ensures the engine reaches its operating temperature efficiently and remains within the desired temperature range. This regulation is vital for engine efficiency, as it allows the engine to operate at peak performance levels while protecting it from damage due to overheating or underheating.

Key Features

The 3919015 is distinguished by its robust design and the quality of materials used in its construction. It is engineered to withstand the high temperatures and pressures typical of commercial truck engines. The thermostat incorporates advanced technology to provide precise temperature control, enhancing engine performance and reliability. Its design ensures a secure fit within the engine system, minimizing the risk of leaks and ensuring efficient coolant flow.

Benefits

Utilizing this part offers several advantages. It contributes to improved engine performance by ensuring the engine operates at its optimal temperature. This efficiency can lead to better fuel economy and reduced emissions ². Additionally, by maintaining the engine within its ideal temperature range, the thermostat helps prolong the life of engine components, reducing the need for frequent repairs or replacements. Its reliability in various operating conditions makes it a valuable component for commercial truck fleets.

Installation and Compatibility

Proper installation of this part is crucial for ensuring optimal performance. It should be installed according to the manufacturer’s guidelines to ensure a secure fit and efficient operation. Compatibility with specific engine models is important, and it is recommended to consult the manufacturer’s specifications to ensure the thermostat is suitable for the intended application. Attention to detail during installation, such as ensuring the thermostat is correctly oriented and the cooling system is free of air pockets, is vital for its effective operation.

Troubleshooting and Maintenance

Common issues with thermostats include failure to open or close properly, which can lead to overheating or underheating of the engine. Symptoms of a failing thermostat may include fluctuating engine temperature, overheating, or a lack of heat from the cabin heater. Diagnostic procedures involve checking the thermostat’s operation and ensuring there are no obstructions in the cooling system. Regular maintenance, such as flushing the cooling system and inspecting the thermostat for signs of wear, can help ensure its longevity and proper function ¹.

Environmental and Operational Considerations

The 3919015 contributes to reducing emissions and improving fuel efficiency by ensuring the engine operates at its optimal temperature. This efficiency is particularly beneficial in commercial truck applications, where fuel economy and emissions control are critical ². The thermostat is designed to perform reliably in various environmental conditions, from extreme heat to cold, ensuring consistent engine performance regardless of the operating scenario.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a reputation for innovation and quality, Cummins has been a trusted name in the industry for decades. The company’s commitment to manufacturing high-quality engine components, including thermostats, reflects its dedication to enhancing engine performance, reliability, and efficiency across a wide range of applications.

Thermostat 3919015 Compatibility with Cummins Engines

The thermostat part number 3919015, manufactured by Cummins, is designed to fit seamlessly with several of their engine models. This component is crucial for maintaining optimal engine temperature, ensuring efficient operation and longevity of the engine.

Compatible Engines

• 6C8.3: The 3919015 thermostat is engineered to integrate with the 6C8.3 engine, providing precise temperature regulation.
• C GAS PLUS CM556: This thermostat is also compatible with the C GAS PLUS CM556 engine, ensuring that the engine operates within its ideal temperature range.
• C8.3 G and G8.3: Both the C8.3 G and G8.3 engines are designed to work with the 3919015 thermostat, allowing for effective thermal management.

Grouping of Compatible Engines

The compatibility of the 3919015 thermostat extends across multiple Cummins engine models, including the 6C8.3, C GAS PLUS CM556, C8.3 G, and G8.3. This broad compatibility ensures that users can confidently select this thermostat for their specific engine needs, knowing it is designed to fit and function optimally within these engine types.

Role of Part 3919015 Thermostat in Engine Systems

The thermostat, identified by part number 3919015, is an integral component in maintaining the optimal operating temperature of an engine. It works in conjunction with several key components to ensure efficient engine performance and longevity.

Interaction with the Engine Oil System

The thermostat plays a significant role in the engine oil system. As the engine starts, the thermostat remains closed, preventing coolant from flowing through the radiator. This allows the engine to warm up quickly. Once the engine reaches the optimal operating temperature, the thermostat opens, allowing coolant to circulate. The coolant absorbs heat from the engine components, including the engine oil. The heated coolant then passes through the oil cooler, where it transfers heat to the engine oil. This process ensures that the engine oil remains at an optimal temperature, reducing viscosity and improving lubrication. Proper lubrication is essential for minimizing friction and wear on engine components, thereby enhancing overall engine efficiency and durability.

Contribution to the Cooler System

In addition to its role in the engine oil system, the thermostat is also vital for the operation of the engine’s cooler system. The cooler system, which includes components like the radiator and intercooler, relies on the thermostat to regulate the flow of coolant. By controlling when the coolant enters the cooling circuit, the thermostat ensures that the engine does not overheat during operation. This regulation is particularly important in high-performance engines, where maintaining precise temperature control can significantly impact engine efficiency and power output.

Overall, the thermostat (part 3919015) is a key component that ensures the engine operates within its designed temperature range, contributing to the efficient functioning of both the engine oil and cooler systems.

Conclusion

The Cummins 3919015 Thermostat is a critical component in the engine cooling system of commercial trucks. By regulating the flow of coolant, it ensures the engine operates at its optimal temperature, enhancing performance, fuel efficiency, and longevity. Proper installation, regular maintenance, and understanding its role in the engine system are essential for maximizing the benefits of this part.