3903723
Plain Washer
Cummins®

The Cummins 3903723 Plain Washer is a critical component designed for use in commercial truck operations. Its primary function is to provide a smooth surface between two mating parts, reducing friction and wear. This washer ensures the efficient and reliable operation of various truck systems by maintaining proper alignment and distributing loads evenly.

Basic Concepts of Plain Washers

Plain washers are essential components in mechanical systems. Typically flat and annular, they are made from materials like metal or plastic. Their main functions include providing a bearing surface, distributing loads, preventing surface damage, and reducing friction between components. Plain washers are placed between bolted or screwed parts to ensure even force distribution and prevent direct surface contact, which could cause wear or damage ¹.

Role of the 3903723 Plain Washer in Truck Operations

In commercial trucks, the Cummins 3903723 Plain Washer plays a crucial role in the operation and maintenance of various systems. It is commonly used with bolts and nuts to secure components, ensuring they remain firmly in place under varying loads and conditions. By providing a smooth surface and distributing the load, this washer helps prevent galling, corrosion, and other forms of wear that can occur when metal surfaces are in direct contact. Its use contributes to the longevity and reliability of truck components, facilitating efficient maintenance and repair processes ².

Key Features

The Cummins 3903723 Plain Washer is characterized by several key features that enhance its performance and durability. It is typically made from high-quality materials such as stainless steel or hardened steel, offering excellent resistance to wear and corrosion. The dimensions of this washer are designed to fit specific applications, ensuring a proper fit and function within the truck’s mechanical systems. Its design includes a flat, uniform thickness and precise outer and inner diameters, allowing it to perform its intended function effectively.

Benefits

Using the Cummins 3903723 Plain Washer provides several benefits in truck applications. Its durable material composition ensures long-lasting performance, even under demanding conditions. The washer’s design helps improve the reliability of truck components by reducing friction and wear between mating parts. Additionally, its use contributes to the overall performance of the truck by ensuring that components remain securely in place, operating efficiently and safely.

Troubleshooting and Maintenance

Common issues associated with plain washers include wear, corrosion, and improper fit. To troubleshoot these issues, it is important to regularly inspect washers for signs of damage or deformation. If a washer appears worn or corroded, it should be replaced to prevent further damage to the mating components. Maintenance practices for plain washers involve ensuring they are properly installed and that the components they support are securely fastened. Regular checks and replacements, as needed, help ensure optimal performance and longevity of the washers and the systems they support.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for innovation, quality, and reliability in the commercial truck industry. The company’s commitment to excellence is reflected in its wide range of products, including the Cummins 3903723 Plain Washer, which is designed to meet the rigorous demands of commercial truck operations.

Cummins Engine Part 3903723: Plain Washer Compatibility

The Cummins part number 3903723, a Plain Washer, is a critical component in the assembly and maintenance of various Cummins engines. This washer is designed to provide a smooth, flat surface that ensures proper sealing and alignment in numerous engine applications. Below is a detailed breakdown of the engines with which this washer is compatible:

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• G8.3
• L8.9
• L8.9 L121
• L9.5 L117
• Z13 Z108G

Grouping of Compatible Engines

Group 1: Single Engine Models

• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• G8.3
• L8.9
• L9.5 L117

Group 2: Dual Engine Models

• L8.9 L121
• Z13 Z108G

The Plain Washer 3903723 is engineered to fit seamlessly into these engines, ensuring that each component operates efficiently and reliably. This washer plays a vital role in maintaining the integrity of the engine’s assembly, preventing leaks, and ensuring that all parts are securely fastened.

Role of Part 3903723 Plain Washer in Engine Systems

The part 3903723 Plain Washer is an essential component in various engine systems, ensuring the smooth operation and efficiency of several critical functions. Here’s how it integrates with different engine components:

Air Fuel Control Plumbing

In the air fuel control plumbing system, the Plain Washer helps maintain the integrity of connections between various components. It ensures that there are no leaks in the system, which is vital for maintaining the correct air-fuel ratio.

Bosch Fuel Pump Kit

When installed in a Bosch fuel pump kit, the Plain Washer plays a role in securing the connections between the fuel pump and its associated plumbing. This ensures a consistent fuel supply to the engine, enhancing performance and reliability.

Engine Instrument Panel

Although indirectly related, the Plain Washer can be found in the connections leading to the engine instrument panel. It helps in maintaining accurate readings by ensuring that all fluid lines are securely connected without leaks.

Exhaust Manifold and Exhaust Recirculation

In the exhaust manifold and exhaust recirculation systems, the Plain Washer is used to seal connections, preventing exhaust gases from escaping. This not only improves engine efficiency but also reduces emissions.

Exhaust Recirculation Air Plumbing

For the exhaust recirculation air plumbing, the Plain Washer ensures that the recirculated exhaust gases are properly directed back into the intake system. This helps in reducing nitrogen oxides (NOx) emissions and improving overall engine performance.

Fuel Plumbing and Fuel Pump

In fuel plumbing and at the fuel pump, the Plain Washer is critical for securing connections. It ensures that fuel lines are leak-free, which is essential for maintaining fuel pressure and delivering a consistent fuel supply to the engine.

Fuel Pump Conversion Kit and Fuel Pump Coupling

When using a fuel pump conversion kit or fuel pump coupling, the Plain Washer helps in achieving a tight seal. This is important for the efficient transfer of fuel from the tank to the engine, ensuring optimal performance.

Fuel Shutoff Valve and Fuel Supply Line

In the fuel shutoff valve and fuel supply line, the Plain Washer ensures that the valve can effectively control the fuel flow without any leaks. This is important for safety and engine management.

Fuel Tube and Injector Fuel Supply Tube

For the fuel tube and injector fuel supply tube, the Plain Washer secures connections, ensuring that fuel is delivered to the injectors without any interruptions. This is vital for precise fuel delivery and engine performance.

Injector Fuel Tube and Injector Plumbing

In injector fuel tubes and injector plumbing, the Plain Washer ensures that the fuel injectors receive a consistent fuel supply. This is essential for maintaining the correct fuel spray pattern and engine combustion efficiency.

Turbocharger and Performance Parts

In turbocharger systems and various performance parts, the Plain Washer is used to secure high-pressure connections. This ensures that the turbocharger can operate efficiently without any loss of boost pressure.

Tube Brace

Lastly, in tube braces, the Plain Washer helps in securing the structural components, ensuring that all connections are tight and secure. This is important for the overall integrity and performance of the engine system.

Conclusion

The Cummins 3903723 Plain Washer is a vital component in the operation and maintenance of commercial trucks and various Cummins engines. Its role in reducing friction, preventing wear, and ensuring secure connections across multiple engine systems underscores its importance. Regular maintenance and timely replacement of this part are essential for the longevity and reliability of truck and engine components.