4973373
Thermostat
Cummins®

The Cummins 4973373 Thermostat is a component designed for use in commercial trucks, playing a significant role in the engine’s cooling system. Its purpose is to regulate the engine’s temperature, ensuring it operates within a specified range for optimal performance and longevity. Understanding the function and importance of this thermostat is vital for maintaining the efficiency and reliability of commercial truck engines.

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 desired range. In an engine cooling system, the thermostat monitors the engine’s temperature and controls 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, thereby regulating the engine’s temperature ¹.

Purpose of the Cummins 4973373 Thermostat

The Cummins 4973373 Thermostat is designed to maintain the engine’s optimal operating temperature. By regulating the flow of coolant, it ensures the engine reaches its operating temperature quickly and remains within the ideal temperature range. This regulation is crucial for efficient engine operation, as it helps to reduce wear and tear, improve fuel efficiency, and prevent damage from overheating or underheating ².

Key Features

The Cummins 4973373 Thermostat features a robust design that includes high-quality materials to ensure durability and reliable performance. Its construction allows for precise temperature control, and it is engineered to withstand the harsh conditions often encountered in commercial truck operations. The thermostat’s design also facilitates easy installation and maintenance, contributing to its overall effectiveness in engine temperature management ³.

Benefits

The use of the Cummins 4973373 Thermostat offers several advantages. It contributes to improved engine efficiency by ensuring the engine operates at its optimal temperature, which can lead to better fuel economy. Additionally, by maintaining consistent engine temperatures, it helps extend the engine’s life and ensures reliable temperature regulation under various operating conditions, enhancing the overall performance and reliability of the vehicle ⁴.

Installation and Compatibility

Proper installation of the Cummins 4973373 Thermostat is crucial for its effective operation. It is designed to be compatible with specific Cummins engine models, ensuring a precise fit and function. Installation procedures should follow manufacturer guidelines to ensure the thermostat is correctly positioned and secured, allowing for optimal coolant flow and temperature regulation.

Troubleshooting and Maintenance

Common issues with the Cummins 4973373 Thermostat may include failure to open or close properly, leading to overheating or underheating of the engine. Diagnostic tips include checking for proper installation, ensuring there are no obstructions in the coolant flow, and verifying that the thermostat is the correct model for the engine. Regular maintenance, such as inspecting the thermostat during routine engine service, can help identify potential issues early and ensure the thermostat continues to function correctly.

Performance in Various Conditions

The Cummins 4973373 Thermostat is engineered to perform effectively under a wide range of operating conditions, including extreme temperatures, heavy loads, and varying altitudes. Its design ensures consistent engine temperature regulation, which is vital for maintaining engine efficiency and reliability in demanding environments. The thermostat’s ability to adapt to these conditions contributes to the overall performance and durability of the engine.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and related technologies. With a strong reputation in the commercial truck industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and focus on technological advancement underscore its position as a leader in the power industry.

Thermostat 4973373 Compatibility with Cummins Engines

The thermostat part number 4973373, manufactured by Cummins, is designed to fit a variety of Cummins engines, ensuring optimal thermal regulation and engine performance. Below is a detailed description of the engines with which this thermostat is compatible.

ISM Series Engines

• ISM CM570
• ISM CM570/870
• ISM CM876
• ISM11 CM876 SN

These ISM series engines, known for their robust performance and reliability, are suitable for heavy-duty applications. The thermostat 4973373 is engineered to maintain the optimal operating temperature for these engines, enhancing efficiency and longevity.

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871
• ISX12 CM2350 X102
• ISX12 G CM2180 EJ
• ISX12/ISX11.9 CM2250
• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

The ISX series engines are renowned for their power and efficiency. The thermostat 4973373 is specifically designed to work with these engines, ensuring precise temperature control and preventing overheating or underheating, which can lead to performance issues or engine damage.

ISZ Series Engines

• ISZ13 CM2150 Z105

The ISZ series engines are designed for applications requiring a balance of power and fuel efficiency. The thermostat 4973373 is compatible with the ISZ13 CM2150 Z105, providing the necessary thermal regulation to maintain engine performance.

L10 Series Engines

• L10 GAS
• L10 MECHANICAL

The L10 series engines, both in gas and mechanical configurations, benefit from the thermostat 4973373. This part ensures that these engines operate within their optimal temperature range, enhancing reliability and performance.

M11 Series Engines

• M11 CELECT
• M11 CELECT PLUS
• M11 MECHANICAL

The M11 series engines, including the CELECT and CELECT PLUS variants, are designed for a variety of applications. The thermostat 4973373 is compatible with these engines, providing precise temperature control to ensure peak performance and efficiency.

N14 Series Engines

• N14 CELECT PLUS

The N14 CELECT PLUS engine is another model that benefits from the thermostat 4973373. This part ensures that the engine maintains the correct operating temperature, contributing to its overall performance and longevity.

QSM Series Engines

• QSM11 CM570
• QSM11 CM876

The QSM series engines, particularly the QSM11 variants, are designed for demanding applications. The thermostat 4973373 is compatible with these engines, providing the necessary thermal regulation to maintain optimal performance.

QSN Series Engines

• QSN14 CM876 N103

The QSN14 CM876 N103 engine is another model that can utilize the thermostat 4973373. This part ensures that the engine operates within its optimal temperature range, enhancing its performance and reliability.

QSX Series Engines

• QSX11.9 CM2250 ECF
• QSX15 CM2250

The QSX series engines, including the QSX11.9 and QSX15 variants, are designed for high-performance applications. The thermostat 4973373 is compatible with these engines, providing precise temperature control to ensure peak performance and efficiency.

Role of Part 4973373 Thermostat in Engine Systems

The part 4973373 thermostat is an essential component in the thermal management of engine systems. It is strategically positioned within the engine’s cooling system, typically between the engine block and the upper radiator hose. Its primary function is to regulate the flow of coolant based on the engine’s temperature.

When the engine is cold, the thermostat remains closed, preventing coolant from flowing through the radiator. This allows the engine to warm up more quickly, enhancing efficiency and reducing emissions during the initial phase of operation. As the engine temperature rises, the thermostat gradually opens, allowing coolant to circulate through the radiator where it is cooled before returning to the engine. This continuous cycle ensures that the engine operates within its optimal temperature range, preventing overheating and maintaining performance.

The thermostat housing, which encases the thermostat, plays a supportive role in this process. It provides a secure environment for the thermostat, ensuring it functions correctly under varying pressure and temperature conditions. The housing is typically made from durable materials to withstand the rigors of engine operation and to maintain a seal that prevents coolant leaks.

In summary, the part 4973373 thermostat, in conjunction with the thermostat housing, forms a vital part of the engine’s cooling system. It ensures that the engine maintains an efficient operating temperature, contributing to overall engine health and performance.

Conclusion

The Cummins 4973373 Thermostat is a critical component in the engine cooling system of commercial trucks. By regulating the flow of coolant, it ensures the engine operates within its optimal temperature range, enhancing efficiency, reliability, and longevity. Proper installation, regular maintenance, and understanding its role in engine systems are essential for maximizing the benefits of this Cummins part.