3939914
Intake Air Heater
Cummins®

Introduction

The Cummins 3939914 Intake Air Heater is a component designed to enhance the performance of diesel engines in commercial trucks, particularly in cold weather conditions. This part is integral to the efficient operation of the engine by ensuring that the air entering the combustion chamber is at an optimal temperature ¹.

Basic Concepts of Intake Air Heaters

An intake air heater is a device used in diesel engines to warm the air before it enters the combustion chamber. This is achieved through electrical resistance heating elements that raise the temperature of the intake air. The principle of operation involves passing the cold intake air over these heating elements, which increases the air temperature. This process improves the efficiency of the combustion process by ensuring that the air-fuel mixture is at an optimal temperature for ignition ².

Purpose of the Cummins 3939914 Intake Air Heater

The Cummins 3939914 Intake Air Heater plays a significant role in the operation of a truck by preheating the intake air. This is particularly beneficial in cold weather conditions, where the density of the air is higher, and the engine may struggle to achieve efficient combustion. By warming the intake air, the heater helps to maintain engine performance, reduce emissions, and improve fuel efficiency ³.

Key Features

The Cummins 3939914 Intake Air Heater is characterized by several key features that enhance its functionality. These include a robust design that ensures durability in harsh operating conditions, the use of high-quality materials to withstand high temperatures, and precise engineering to ensure efficient heat transfer. Additionally, the heater is designed for easy integration into the truck’s air intake system, minimizing the need for complex modifications.

Benefits of Using an Intake Air Heater

The use of the 3939914 Intake Air Heater offers several advantages. It improves engine start-up in cold weather by ensuring that the intake air is at an optimal temperature for combustion. This leads to enhanced fuel efficiency as the engine operates more efficiently. Furthermore, the heater reduces wear on engine components by promoting smoother and more consistent engine operation.

Installation and Integration

Installing the Cummins 3939914 Intake Air Heater involves integrating it into the truck’s air intake system. This may require minor modifications to the existing system to ensure a proper fit. The installation process is designed to be straightforward, with clear instructions provided to facilitate a smooth integration. It is important to follow these instructions carefully to ensure the heater functions correctly and efficiently.

Maintenance and Troubleshooting

Maintaining the 3939914 Intake Air Heater is crucial for ensuring its optimal performance and longevity. Regular inspections should be conducted to check for any signs of wear or damage. Common issues may include electrical faults or blockages in the air intake path. Troubleshooting tips include checking the electrical connections, ensuring the heating elements are clean and free from debris, and verifying that the air intake path is unobstructed.

Performance Impact

The Cummins 3939914 Intake Air Heater has a noticeable impact on the overall performance of the truck. It contributes to improved engine efficiency by ensuring that the combustion process is optimal, even in cold weather conditions. This can lead to reductions in emissions and enhanced drivability, as the engine operates more smoothly and consistently.

Safety Considerations

When using and maintaining the 3939914 Intake Air Heater, it is important to observe certain safety precautions. During installation, ensure that all electrical connections are secure and that the heater is properly grounded to prevent electrical hazards. During operation, monitor the heater for any signs of overheating or malfunction, and address these issues promptly to avoid potential safety risks.

Environmental Impact

The use of the Cummins 3939914 Intake Air Heater can have positive environmental impacts. By improving the efficiency of the combustion process, it helps to reduce cold-start emissions. This contributes to lower overall emissions from the vehicle, which is beneficial for the environment.

Cummins Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its commitment to innovation and quality in engine components. With a rich history of developing reliable and efficient engine solutions, Cummins continues to play a significant role in advancing the technology and performance of commercial vehicles.

Compatibility

The Cummins part 3939914, an Intake Air Heater, is designed to fit a range of Cummins engines, enhancing their performance and reliability. This part is compatible with the following engines:

• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• B5.6 CM2670 B152B

Additionally, it is also suitable for the following ISB engines:

• ISB CM550
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149

For the QSB series, the Intake Air Heater is compatible with:

• QSB3.9 30 CM550
• QSB5.9 30 CM550
• QSB5.9 44 CM550
• QSB5.9 CM550

Lastly, it fits the QSC8.3 CM850 (CM2850) engine as well.

This compatibility ensures that the Intake Air Heater can be effectively used across a variety of Cummins engine models, providing consistent performance and reliability.

Role of Part 3939914 Intake Air Heater in Engine Systems

The part 3939914 Intake Air Heater is an essential component in various engine systems, particularly in cold climates or for engines that require preheated air for optimal performance. This component is integrated into the Air Intake (AI) system and works in conjunction with the Air Heater Starting (AHS) system to ensure efficient engine operation.

When the engine is started in cold conditions, the Intake Air Heater draws power from the battery to heat the air before it enters the engine. This preheated air aids in the combustion process, allowing the engine to reach its operating temperature more quickly and efficiently. The Air Intake Connection (AIC) is the interface where the heated air from the intake air heater meets the main air intake stream. This connection ensures that the preheated air is effectively mixed with the incoming air, enhancing the overall air-fuel mixture.

The Connection (C) between the intake air heater and the air intake system is designed to be robust and secure, ensuring that there are no leaks in the system. This is vital for maintaining the integrity of the air-fuel mixture and ensuring that the engine receives the correct amount of preheated air.

Conclusion

In summary, the Cummins 3939914 Intake Air Heater plays a significant role in improving engine performance in cold conditions by preheating the intake air, which is then seamlessly integrated into the air intake system through the air intake connection. This component ensures that the engine operates efficiently from the moment it is started, contributing to better overall performance and longevity of the engine.