4984872
Temperature Switch
Cummins®

Introduction

The Cummins 4984872 Temperature Switch is a component designed to monitor and regulate the temperature within heavy-duty truck engines. Its role is significant as it helps maintain optimal engine operating conditions, contributing to the overall efficiency and longevity of the vehicle.

Basic Concepts of Temperature Switches

A temperature switch is a device that opens or closes an electrical circuit in response to a specific temperature threshold. It functions by utilizing a temperature-sensitive element that expands or contracts with temperature changes, thereby activating or deactivating the switch. In automotive systems, temperature switches are commonly used to control various functions such as engine cooling fans, warning lights, and other temperature-sensitive operations ¹.

Purpose of the Cummins 4984872 Temperature Switch

This Cummins part plays a role in the engine cooling system by monitoring the engine’s temperature. When the engine reaches a predetermined temperature, the switch activates the cooling fan or other cooling mechanisms to prevent overheating. Additionally, it may be used to trigger warning signals to the driver, indicating that the engine temperature is outside the normal operating range ².

Key Features

The Cummins 4984872 Temperature Switch is characterized by its robust design and high-quality materials, which ensure durability and reliable performance under varying conditions. It features a precise temperature-sensing element and a durable housing that protects against environmental factors. The switch is engineered to provide accurate temperature readings and consistent operation over time ³.

Benefits

Using the Cummins 4984872 Temperature Switch can lead to improved engine performance by ensuring that the engine operates within its optimal temperature range. This contributes to enhanced reliability and efficiency, as well as potentially extending the engine’s lifespan by preventing overheating and related damage ⁴.

Installation

Installing this Cummins part requires careful attention to ensure proper function and integration within the engine system. The process involves locating the appropriate mounting point, connecting the electrical wiring according to the manufacturer’s instructions, and securing the switch in place. Tools such as a wrench and electrical connectors may be necessary. Following the step-by-step instructions provided by Cummins ensures a correct and safe installation ⁵.

Troubleshooting

Common issues with the Cummins 4984872 Temperature Switch may include inaccurate temperature readings or failure to activate cooling mechanisms at the correct temperature. Troubleshooting steps involve checking the electrical connections for integrity, ensuring the switch is properly mounted, and verifying that the temperature-sensing element is functioning correctly. If problems persist, consulting the manufacturer’s guidelines or seeking professional assistance may be necessary ⁶.

Maintenance

Regular maintenance of the Cummins 4984872 Temperature Switch is important for ensuring optimal performance and longevity. This includes periodic inspection of the switch for signs of wear or damage, cleaning the housing to remove any debris that may affect operation, and verifying that electrical connections remain secure. Adhering to recommended inspection intervals and maintenance procedures helps prevent issues and ensures the switch continues to operate effectively ⁷.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration systems, and related components. With a strong reputation in the automotive industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range serves various markets, from heavy-duty trucks to industrial applications, demonstrating its versatility and expertise in power technology ⁸.

Temperature Switch 4984872 in Cummins Engines

The Temperature Switch 4984872, manufactured by Cummins, is a critical component in the engine’s cooling system. This part is designed to monitor the engine’s temperature and ensure it remains within the optimal operating range.

Application in Specific Engines

• 6B5.9 Engine

  • The Temperature Switch 4984872 is integral to the 6B5.9 engine, where it plays a pivotal role in maintaining the engine’s thermal efficiency. By accurately sensing the coolant temperature, this switch ensures that the engine operates at the correct temperature, preventing overheating and potential damage.

• Group of Engines

  • The Temperature Switch 4984872 is also compatible with a range of Cummins engines. Its design allows it to fit seamlessly into various engine configurations, providing consistent and reliable temperature monitoring across different models. This compatibility ensures that the switch can be used across multiple engine types, enhancing its utility and reliability.

Importance of the Temperature Switch

The Temperature Switch 4984872 is essential for the following reasons:

• Prevents Overheating: By monitoring the engine’s temperature, the switch helps prevent overheating, which can lead to engine failure.
• Improves Efficiency: Maintaining the correct engine temperature ensures optimal performance and fuel efficiency.
• Enhances Longevity: By protecting the engine from excessive heat, the switch contributes to the engine’s overall lifespan.

Role of Part 4984872 Temperature Switch in Engine Systems

The part 4984872 temperature switch is an essential component in the regulation and monitoring of engine temperature within various engine systems. Its primary function is to detect the temperature of the engine coolant and signal the engine control unit (ECU) when the temperature reaches a specific threshold.

In fuel injection systems, the temperature switch plays a significant role by providing temperature data to the ECU. This information allows the ECU to adjust the fuel injection timing and quantity, ensuring optimal combustion efficiency and reducing emissions. As the engine warms up, the switch signals the ECU to enrich the fuel mixture, facilitating smoother starts and better performance during cold conditions. Once the engine reaches operating temperature, the switch helps maintain a stable fuel mixture, enhancing overall engine efficiency.

In starting systems, the temperature switch is integrated to ensure reliable engine starts under varying temperature conditions. During cold starts, the switch informs the ECU to increase the duration of the fuel injector pulse, providing a richer fuel mixture that is necessary for combustion in low-temperature environments. This not only aids in easier engine cranking but also protects the engine from potential damage due to incomplete combustion.

Additionally, the temperature switch is vital in auxiliary systems such as the engine cooling fan. When the engine temperature exceeds a certain point, the switch activates the cooling fan, ensuring that the engine does not overheat. This proactive management of engine temperature helps in maintaining the longevity and performance of the engine components.

Overall, the part 4984872 temperature switch is a key component in ensuring that engine systems operate efficiently and reliably across a range of temperatures.

Conclusion

The Cummins 4984872 Temperature Switch is a vital component in maintaining the optimal performance and longevity of heavy-duty truck engines. By accurately monitoring and regulating engine temperature, this part ensures that the engine operates efficiently, prevents overheating, and contributes to the overall reliability of the vehicle. Proper installation, regular maintenance, and timely troubleshooting are essential to maximize the benefits of this Cummins part.