5627589
Thermostat
Cummins®

The Cummins 5627589 Thermostat is a critical component designed for use in commercial trucks. Its primary function is to regulate the engine’s temperature, ensuring it operates within a specified range for optimal performance and longevity. This thermostat is integral to the engine cooling system, playing a key role in maintaining the engine’s thermal efficiency and preventing overheating.

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 the context of an engine, the thermostat operates based on the principles of thermal expansion and contraction. When the engine is cold, the thermostat remains closed, blocking coolant flow to the radiator. As the engine warms up, the thermostat opens, allowing coolant to circulate through the engine and radiator, thereby regulating the engine’s temperature ¹.

Role of the 5627589 Thermostat in Truck Operation

This Cummins part operates within the engine cooling system of a truck by controlling the flow of coolant based on the engine’s temperature. When the engine is cold, the thermostat remains closed, preventing coolant from flowing to the radiator. This allows the engine to warm up more quickly. Once the engine reaches the optimal operating temperature, the thermostat opens, enabling coolant to circulate through the engine and radiator. This process helps maintain the engine’s temperature within a range that ensures efficient operation and prevents overheating ².

Key Features

The 5627589 Thermostat is designed with specific features that enhance its performance and durability in heavy-duty applications. It is constructed from high-quality materials that can withstand the extreme conditions encountered in commercial truck operations. The thermostat’s design includes a robust housing and a precise wax pellet or bimetallic strip mechanism that ensures accurate temperature control. Additionally, it features a durable seal that prevents coolant leaks, contributing to its reliability and longevity.

Benefits

Using this Cummins part offers several advantages. It contributes to improved engine efficiency by ensuring the engine operates at the optimal temperature, which can lead to better fuel economy. The thermostat’s durable construction and reliable performance enhance the engine’s longevity, reducing the need for frequent replacements. These benefits contribute to overall truck performance and can result in operational cost savings over time ³.

Troubleshooting and Maintenance

Common issues with thermostats may include failure to open or close properly, leading to overheating or insufficient engine warm-up. Symptoms of thermostat failure can include fluctuating temperature gauge readings, overheating, or a lack of heat from the heater core. To diagnose thermostat issues, it is recommended to monitor the engine’s temperature and check for proper coolant flow. Regular maintenance practices, such as inspecting the thermostat during routine engine service and replacing it according to the manufacturer’s recommendations, can help ensure its longevity and proper function.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes diesel and natural gas engines, as well as related technologies. With a history spanning over a century, Cummins has established a reputation for quality and innovation in the automotive industry. The company is committed to providing reliable and efficient power solutions, backed by a strong focus on customer satisfaction and technological advancement.

Thermostat 5627589 Compatibility with Cummins Engines

The thermostat part number 5627589, manufactured by Cummins, is designed to be compatible with a range of Cummins engines. This part is integral for maintaining the optimal operating temperature of the engine by regulating the flow of coolant.

Compatible Engines

• B4.5 RGT
• B6.7 CM2350 B135B

The thermostat 5627589 is engineered to fit seamlessly within the cooling systems of these engines, ensuring efficient thermal management.

• ISB (Chrysler)
• ISB CM2150
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

For the ISB series engines, including those with Chrysler applications, the thermostat 5627589 is specifically designed to integrate with the cooling architecture, providing reliable temperature control.

• QSB4.5 CM850 (CM2850)
• QSB6.7 CM2250
• QSB6.7 CM2350 B105
• QSB6.7 CM850 (CM2850)

The QSB series engines also benefit from the thermostat 5627589. This part is tailored to fit within the cooling systems of these engines, ensuring that they operate within their optimal temperature range, thus enhancing performance and longevity.

Role of Part 5627589 Thermostat in Engine Systems

The part 5627589 thermostat is an essential component in maintaining the optimal operating temperature of an engine. When integrated with a long block, the thermostat regulates the flow of coolant between the engine and the radiator. This regulation ensures that the engine reaches its operating temperature efficiently and maintains it under various driving conditions.

In a long block kit, which typically includes the cylinder block, crankshaft, pistons, and other core components, the thermostat plays a significant role in the overall performance and longevity of the engine. By controlling the coolant flow, it prevents the engine from overheating, which can lead to severe damage, and also ensures that the engine does not operate at temperatures that are too low, which can result in inefficient combustion and increased emissions.

The thermostat achieves this by opening and closing at specific temperatures. When the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly. Once the engine reaches the optimal operating temperature, the thermostat opens, allowing coolant to flow through the engine and into the radiator, where it is cooled before returning to the engine. This continuous cycle is vital for the stable operation of the engine and the prevention of thermal stress on engine components.

Conclusion

The Cummins 5627589 Thermostat is a vital component in the engine cooling system of commercial trucks. Its role in regulating the engine’s temperature ensures optimal performance, fuel efficiency, and longevity. With its robust design and compatibility with various Cummins engines, this thermostat is a reliable choice for maintaining the thermal efficiency of heavy-duty applications.