4946291
1 Cylinder Air Compressor
Cummins®

The Cummins 4946291 Single Cylinder Air Compressor is a component designed to provide compressed air for various systems in commercial trucks. Its purpose is to generate the necessary air pressure required for the operation of air brakes, suspension systems, and other pneumatic components. The compressor’s role is significant in ensuring the safe and efficient operation of these systems.

Basic Concepts of Single Cylinder Air Compressors

Single cylinder air compressors operate on the principle of converting mechanical energy into pneumatic energy. This is achieved through the compression of air within a cylinder, driven by a piston. The process involves the intake of ambient air, compression within the cylinder, and the discharge of compressed air into a storage tank or directly to the pneumatic systems. Key components include the cylinder, piston, intake and exhaust valves, and the drive mechanism. The physics involved in compressing air involves increasing its pressure and temperature, which is a fundamental aspect of how these compressors function ¹.

Role in Truck Operation

The Cummins 4946291 Single Cylinder Air Compressor plays a role in the operation of a truck by providing the compressed air needed for the air brake system. It is integrated with the truck’s engine through a belt-driven mechanism, allowing it to operate in sync with the engine’s rotation. The compressor ensures that the air brake system has a consistent supply of compressed air, which is vital for the safe operation of the vehicle. Additionally, it supports other pneumatic components such as the suspension system, enhancing the truck’s performance and comfort.

Key Features

The Cummins 4946291 Single Cylinder Air Compressor is characterized by its robust design and high-quality build. It features a durable cylinder and piston assembly, designed to withstand the rigors of commercial truck operation. The compressor is engineered for efficiency, with a focus on minimizing energy consumption while maximizing air output. Unique attributes include its compact size, which allows for easier installation in tight spaces, and its reliability, backed by Cummins’ reputation for producing high-quality components.

Benefits

The benefits of the Cummins 4946291 Single Cylinder Air Compressor include improved efficiency in air production, which translates to better performance of the truck’s air brake system. Its reliable operation ensures consistent air pressure, contributing to safer braking. Additionally, the compressor’s design enhances the overall performance of the truck’s pneumatic systems, leading to a more comfortable and stable ride.

Installation Process

Installing the Cummins 4946291 Single Cylinder Air Compressor involves several steps. Initially, ensure the truck’s engine is turned off and cooled down. Disconnect the battery to prevent any electrical accidents. Remove the old compressor, if present, by loosening the mounting bolts and disconnecting the air lines and drive belt. Position the new compressor in place, secure it with the mounting bolts, and reconnect the air lines and drive belt. Finally, reconnect the battery and test the compressor for proper operation.

Maintenance Tips

To ensure the longevity and optimal performance of the Cummins 4946291 Single Cylinder Air Compressor, regular maintenance is recommended. This includes checking for leaks in the air lines, ensuring the compressor is securely mounted, and inspecting the drive belt for wear. Lubrication of moving parts, as per the manufacturer’s guidelines, is crucial for reducing friction and wear. Additionally, cleaning the compressor and its surroundings can prevent the accumulation of dirt and debris, which could affect its operation.

Troubleshooting Common Issues

Common issues with the Cummins 4946291 Single Cylinder Air Compressor may include leaks, unusual noises, and performance issues. Leaks can often be traced to worn or damaged air lines, which should be replaced. Unusual noises may indicate a problem with the compressor’s internal components, requiring a professional inspection. Performance issues, such as insufficient air pressure, could be due to a faulty compressor or issues with the air brake system, necessitating a thorough check of the entire system.

Safety Considerations

When working with the Cummins 4946291 Single Cylinder Air Compressor, it is important to observe safety guidelines. This includes handling compressed air with care, as it can cause injuries if mishandled. Ensure that all connections are secure to prevent air leaks, which can be hazardous. Additionally, always disconnect the battery before beginning any work on the compressor to avoid electrical accidents. Following these safety precautions can help ensure a safe working environment.

Cummins Corporation

Cummins Corporation is a renowned manufacturer with a long-standing reputation in the industry for producing high-quality automotive components. Founded in 1919, the company has a history of innovation and commitment to excellence. Cummins is known for its dedication to producing reliable and efficient components, which is evident in the design and performance of the 4946291 Single Cylinder Air Compressor. The company’s focus on quality and customer satisfaction has solidified its position as a leader in the automotive and heavy-duty truck parts market.

Compatibility of Cummins Part 4946291 with Various Engine Models

The Cummins part 4946291, a Single Cylinder Air Compressor, is designed to fit a range of Cummins engine models. This part is engineered to ensure compatibility and optimal performance across various engine types. Here is a detailed look at the engines with which this air compressor is compatible:

ISB Series Engines

• ISB CM2150
• ISB CM850
• ISB/ISD6.7 CM2150 SN
• ISBE CM2150
• ISBE4 CM850

The ISB series engines, including the ISB CM2150, ISB CM850, ISB/ISD6.7 CM2150 SN, ISBE CM2150, and ISBE4 CM850, are designed for a variety of applications, from heavy-duty trucks to industrial and marine uses. The Cummins part 4946291 is specifically engineered to fit these engines, ensuring reliable air compression for their operational needs.

QSB Series Engines

• QSB4.5 CM2250 EC
• QSB4.5 CM850 (CM2850)
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

The QSB series engines, including the QSB4.5 CM2250 EC, QSB4.5 CM850 (CM2850), QSB6.7 CM2250, QSB6.7 CM850 (CM2850), and QSB7 CM2880 B117, are known for their versatility and robust performance. These engines are used in a wide range of applications, from agricultural machinery to construction equipment. The Cummins part 4946291 is compatible with these engines, providing the necessary air compression to support their demanding operations.

Grouping of Compatible Engines

The compatibility of the Cummins part 4946291 with the listed engines can be grouped based on their series and intended applications:

• ISB Series: Ideal for heavy-duty trucks, industrial, and marine applications.
• QSB Series: Suitable for agricultural machinery, construction equipment, and other demanding operational environments.

By ensuring compatibility with these engines, the Cummins part 4946291 provides a reliable and efficient solution for air compression needs across various industries.

Role of Part 4946291 Single Cylinder Air Compressor in Engine Systems

The part 4946291 Single Cylinder Air Compressor is a vital component in various engine systems, primarily responsible for generating compressed air that is essential for multiple functions within these systems.

Fuel Injection Systems

In fuel injection systems, the compressed air produced by the air compressor is used to atomize the fuel, ensuring a fine mist is created for optimal combustion. This enhances fuel efficiency and reduces emissions by promoting a more complete burn of the fuel ².

Pneumatic Tools

For engines that operate pneumatic tools, the air compressor provides the necessary pressurized air. This air is used to power tools such as drills, grinders, and impact wrenches, which are often employed in maintenance and repair tasks on the engine itself or other machinery.

Brake Systems

In automotive and heavy-duty engine applications, the air compressor plays a significant role in the brake systems. Compressed air is used to operate the brakes, providing the force needed to stop or slow down the vehicle. This is particularly important in large trucks and buses where hydraulic brakes alone may not be sufficient.

Starting Systems

Some engines, especially large diesel engines, use compressed air to start the engine. The air compressor builds up pressure, which is then released to turn the engine over, initiating the combustion process.

Cabin Pressurization

In aviation engine systems, the air compressor is part of the system that pressurizes the cabin. It provides a steady supply of compressed air that is mixed with the outside air to maintain a comfortable and safe pressure level inside the aircraft.

Cooling Systems

The compressed air can also be utilized in cooling systems to help regulate the temperature of engine components. By directing compressed air over heat-generating parts, it aids in dissipating heat more effectively.

Maintenance and Testing

During engine maintenance and diagnostic testing, the air compressor is often used to blow out debris from sensitive components, ensuring they remain clean and function correctly. It is also used in pressure testing various engine parts to check for leaks or weaknesses.

Conclusion

In summary, the part 4946291 Single Cylinder Air Compressor is an integral part of engine systems, contributing to efficient operation, safety, and maintenance across a wide range of applications. Its robust design, compatibility with various engine models, and versatile functionality make it a critical component in ensuring the reliable performance of commercial trucks and other heavy-duty machinery.