4078749
Temperature Switch
Cummins®

Introduction

The Cummins 4078749 Temperature Switch is a critical component in commercial trucks, designed to monitor engine coolant temperature and signal the engine management system when it reaches a predetermined threshold. This ensures optimal engine operating conditions and prevents overheating, which could result in damage or reduced efficiency ¹.

Basic Concepts of Temperature Switches

A temperature switch is a device that opens or closes an electrical circuit in response to temperature changes. It consists of a sensing element and a switching mechanism that activates or deactivates the circuit based on the sensor’s readings. In automotive systems, these switches are used to control cooling fans, activate warning lights, and manage other temperature-sensitive functions to ensure the engine operates within safe parameters ².

Role of the 4078749 Temperature Switch in Truck Operation

This Cummins part is integral to the truck’s engine management system. It monitors coolant temperature and sends signals to the engine control unit (ECU) when the temperature exceeds safe levels. This allows the ECU to take corrective actions, such as increasing fan speed or adjusting fuel injection timing, to prevent overheating. The switch interacts with other components like the radiator, thermostat, and cooling fan to maintain a stable engine temperature, contributing to efficient engine performance and longevity ³.

Key Features

The 4078749 Temperature Switch is characterized by its robust design and high-quality materials, ensuring durability and reliable performance in demanding conditions. It features a precise temperature sensing element that provides accurate readings, and its switching mechanism is designed to withstand the vibrations and temperature fluctuations typical in commercial truck environments. Additionally, the switch is engineered to be compatible with Cummins engines, ensuring seamless integration into the engine management system ⁴.

Benefits

This part offers several benefits. It contributes to improved engine performance by helping to maintain optimal operating temperatures, which can enhance fuel efficiency and reduce emissions. The switch also enhances safety by preventing engine overheating, which could lead to costly repairs or breakdowns. Its reliable operation in various operating conditions ensures that truck operators can depend on consistent performance, contributing to overall vehicle reliability ⁵.

Troubleshooting and Maintenance

Common issues with the 4078749 Temperature Switch may include inaccurate temperature readings or failure to activate at the correct temperature. Diagnostic steps involve checking the switch’s electrical connections, testing the sensor’s accuracy, and ensuring the switch is properly installed. Regular maintenance practices, such as inspecting the switch for signs of wear or corrosion and verifying its operation during routine service intervals, can help ensure optimal functionality and prolong the component’s lifespan ⁶.

Compatibility of Temperature Switch Part 4078749 with Cummins Engines

The Temperature Switch part 4078749, manufactured by Cummins, is designed to be compatible with a range of their engines, ensuring reliable operation and efficient thermal management. This part is integral to the engine’s cooling system, providing critical functionality across various engine models.

QSB5.9 CM850 and QSB6.7 M CM2250

Both the QSB5.9 CM850 and QSB6.7 M CM2250 engines benefit from the precise temperature monitoring capabilities of the 4078749 Temperature Switch. These engines, known for their robust performance and durability, rely on this switch to maintain optimal operating temperatures, preventing overheating and ensuring longevity.

QSC8.3 CM850 (CM2850)

The QSC8.3 CM850 (CM2850) engine also integrates the 4078749 Temperature Switch seamlessly. This engine, designed for heavy-duty applications, requires precise thermal management to handle high loads and demanding conditions. The temperature switch plays a crucial role in maintaining the engine’s efficiency and reliability under such strenuous circumstances.

QSM11 CM570

The QSM11 CM570 engine is another model that utilizes the 4078749 Temperature Switch. This engine, known for its power and efficiency, depends on the accurate temperature readings provided by the switch to regulate its cooling system effectively. This ensures that the engine operates within safe temperature limits, enhancing its performance and lifespan.

Conclusion

The Temperature Switch part 4078749 is a vital component for the engines mentioned, providing essential temperature monitoring and control. Its compatibility with the QSB5.9 CM850, QSB6.7 M CM2250, QSC8.3 CM850 (CM2850), and QSM11 CM570 engines underscores its importance in maintaining the engines’ operational integrity and efficiency.