3935171
Sealing Washer
Cummins®

The 3935171 Sealing Washer, manufactured by Cummins, is a critical component in the commercial truck industry, ensuring the operational integrity of various truck systems for efficient and reliable performance.

Basic Concepts of Sealing Washers

Sealing washers are essential in mechanical systems to prevent leaks and maintain pressure within fluid systems. They are placed between two surfaces to create a seal, which is vital for the proper functioning of hydraulic, fuel, and cooling systems in trucks. The integrity of these systems relies on the effective sealing provided by washers to prevent fluid loss and maintain system pressure ¹.

Purpose of the 3935171 Sealing Washer

The 3935171 Sealing Washer is designed to maintain system efficiency in commercial trucks. It is utilized in various truck systems and components where sealing is required, including fuel systems, hydraulic systems, and other areas where fluid transfer and pressure maintenance are critical.

Key Features

This Cummins part is characterized by its design and material properties, which enable it to perform its sealing function effectively. Its shape and size are tailored to fit specific applications, ensuring a snug fit between mating surfaces. The materials used in its construction are chosen for their durability, resistance to wear, and ability to withstand the pressures and temperatures encountered in truck systems ².

Benefits

Using the 3935171 Sealing Washer offers several advantages. It contributes to improved system efficiency by ensuring that fluids are contained within the system, reducing the need for frequent maintenance. Its durable construction enhances the longevity of the components it seals, leading to overall system reliability.

Installation and Usage

Proper installation of the 3935171 Sealing Washer is crucial for its effective performance. It should be installed according to manufacturer guidelines, ensuring that it is correctly positioned between the surfaces it is meant to seal. Specific procedures may include cleaning the mating surfaces and ensuring the washer is not twisted or damaged during installation.

Troubleshooting Common Issues

Common issues with sealing washers include wear, leakage, and failure. These can often be diagnosed by observing signs such as fluid leaks, system pressure drops, or component malfunction. Addressing these issues may involve inspecting the washer for damage, ensuring proper installation, or replacing the washer if it is worn or compromised.

Maintenance Tips

Regular maintenance of the 3935171 Sealing Washer is recommended to prolong its lifespan and ensure consistent performance. This includes periodic inspection for signs of wear or damage and replacement according to the manufacturer’s guidelines or as part of routine system maintenance.

Cummins Overview

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 quality and reliability in the commercial truck industry. Its product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of commercial vehicle operations.

Cummins Sealing Washer 3935171 Compatibility

The Cummins Sealing Washer part number 3935171 is designed to fit a variety of Cummins engines, ensuring a secure seal in various applications. Below is a detailed breakdown of the engines with which this sealing washer is compatible:

Small Bore Engines

• 4B3.9
• 6B5.9
• B3.9 G
• B4.5
• QSB3.9 30 CM550
• QSB4.5 CM850 (CM2850)
• QSB5.9 30 CM550
• QSB5.9 44 CM550
• QSB5.9 CM850
• QSB6.7 CM850 (CM2850)
• QSC8.3 CM554

Medium Bore Engines

• 6C8.3
• QSL9 CM554

Large Bore Engines

• L9.3 L105
• ISB CM550
• ISB CM850
• ISBE CM800
• ISC CM554
• ISC CM850
• ISL CM554
• ISL9 CM2150 SN
• ISM CM570/870
• ISX CM570
• ISX CM870

This sealing washer is engineered to provide a reliable seal in various engine configurations, ensuring optimal performance and longevity.

Role of Part 3935171 Sealing Washer in Engine Systems

The 3935171 Sealing Washer is an essential component in various engine systems, ensuring the integrity and efficiency of these systems. Its application spans across multiple areas, including the accessory, fuel system, and air systems, among others.

Fuel System Integration

In the fuel system, the Sealing Washer is utilized in the fuel pump and fuel plumbing to prevent leaks and maintain pressure integrity. It is also part of the fuel pump coupling and fuel filter assemblies, where it ensures a tight seal, preventing fuel leakage and maintaining the system’s efficiency. Additionally, in the fuel strainer and thermostat housing, the washer helps in sealing connections, ensuring that fuel flows smoothly without any interruptions.

Accessory and Air System Applications

For the accessory components, the Sealing Washer is crucial in the air compressor and air coupling systems. It ensures that the compressed air is sealed properly within the system, preventing any loss of pressure that could affect the performance of the accessories driven by the engine.

In the air heater starting and crankcase breather systems, the washer plays a significant role in sealing the connections, ensuring that the systems operate efficiently without any air leaks. This is particularly important in the crankcase breather system, where it helps in maintaining the correct pressure within the crankcase, contributing to the engine’s overall performance.

Engine Control and Overhaul Kits

The Sealing Washer is also a component in the engine control module (ECM) plumbing and the overhaul kit. In the ECM plumbing, it ensures that all connections are sealed, preventing any electrical or fluid leaks that could affect the engine’s control systems. In the overhaul kit, it is used to seal various connections during the engine’s rebuild process, ensuring that the engine operates efficiently post-overhaul.

Turbocharger and Gasket Sets

In the turbocharger system, the Sealing Washer is used to seal the connections between the turbocharger and the engine, ensuring that the turbocharger operates efficiently without any air leaks. Similarly, in the lower and upper engine gasket sets, the washer is used to seal the connections between various engine components, ensuring that the engine operates smoothly and efficiently.

Specialized Kits and Conversions

The Sealing Washer is also part of specialized kits such as the KV38 BKT, KV50 BKT, and VE conversion kits. In these kits, it is used to seal various connections, ensuring that the kits operate efficiently and effectively. Additionally, in the solenoid kit, the washer is used to seal the connections, ensuring that the solenoid operates without any electrical or fluid leaks.

Conclusion

In summary, the 3935171 Sealing Washer is a versatile component that plays a significant role in ensuring the efficiency and integrity of various engine systems. Its application across different systems highlights its importance in maintaining the overall performance of the engine.