3963990
Sealing Washer

3 Pack

Cummins®

Introduction

The Sealing Washer 3963990 by Cummins is engineered to provide a reliable seal between components in commercial trucks, ensuring that fluids and gases remain contained within their designated pathways. This part is crucial for maintaining the integrity and efficiency of the truck’s systems by preventing leaks and ensuring optimal operation ¹.

Basic Concepts of Sealing Washers

Sealing washers are essential components in mechanical systems, designed to create a seal between two or more parts. They fill the gap between surfaces to prevent the escape of fluids or gases. Typically made from materials that can withstand pressure, temperature variations, and chemical exposure, these washers are widely used across various industries, including automotive, where they are vital for the proper functioning of engines and other systems ².

Role of the 3963990 Sealing Washer in Truck Operations

In commercial truck operations, the 3963990 Sealing Washer is positioned in critical areas where a secure seal is necessary to maintain system efficiency. It fits into grooves or between surfaces, ensuring a tight and leak-free connection. This washer is commonly found in fuel systems, hydraulic systems, and engine components, contributing to the overall performance and reliability of the truck ³.

Key Features

The 3963990 Sealing Washer is characterized by several key features that enhance its performance. It is constructed from durable materials capable of enduring the harsh conditions present in commercial truck environments. The design specifications ensure a precise fit, which is vital for creating an effective seal. Additionally, it may possess unique attributes such as resistance to specific chemicals or the ability to operate under extreme temperatures, further contributing to its effectiveness in truck applications.

Benefits

Incorporating the 3963990 Sealing Washer into truck systems offers several advantages. It improves efficiency by ensuring that fluids and gases remain within their intended pathways, reducing the risk of leaks that can lead to system failures. The reliability of this washer helps maintain consistent performance of the truck’s components. Furthermore, its durability extends the longevity of the systems it is part of, reducing the need for frequent replacements and repairs.

Troubleshooting and Maintenance

Common issues associated with sealing washers include wear and tear, deformation, and failure to create a proper seal. Troubleshooting these problems involves inspecting the washer for signs of damage, ensuring it is correctly installed, and verifying that it is compatible with the system’s requirements. Maintenance practices for the 3963990 Sealing Washer include regular inspection during service intervals, proper installation to avoid damage, and replacement when signs of wear are detected. These practices help maintain the washer’s effectiveness and the overall reliability of the truck’s systems.

About Cummins

Cummins Inc. is renowned for its comprehensive range of power solutions, including engines, filtration, emissions solutions, and related technologies. With a history of innovation and quality, Cummins has established a strong reputation in the commercial truck industry. The company’s product range is designed to meet the demanding requirements of commercial vehicles, ensuring reliability, efficiency, and performance. Cummins’ commitment to quality and customer satisfaction has made it a preferred choice for truck manufacturers and operators worldwide.

Cummins Sealing Washer 3963990 Compatibility

The Cummins Sealing Washer part number 3963990 is a critical component designed to ensure proper sealing and functionality in various engine applications. This sealing washer is compatible with a range of Cummins engines, providing a reliable seal to prevent leaks and maintain engine integrity. Below is a detailed breakdown of the engines with which this sealing washer is compatible:

15N Series Engines

• 15N CM2380 M104B

6B Series Engines

• 6B5.9
• 6C8.3

B4.5 Series Engines

• B4.5 CM2350 B129B
• B4.5 RGT

B5.6 Series Engines

• B5.6 CM2670 B152B

B5.9 Series Engines

• B5.9 CM2670 B166C

B6.7 Series Engines

• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C

D4.0 Series Engines

• D4.0 CM2620 D103B

F3.8 Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102

F4.5 Series Engines

• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

ISB Series Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB4.5 CM2350 B104
• ISB5.9 CM2880 B110

This sealing washer is engineered to fit seamlessly into the specified engine models, ensuring optimal performance and longevity. It is essential to use the correct sealing washer for each engine to maintain the integrity of the engine’s sealing system.

Role of Part 3963990 Sealing Washer in Engine Systems

The Sealing Washer (part 3963990) is integral to maintaining the integrity and efficiency of various engine systems. Its primary function is to ensure a secure seal between components, preventing leaks and maintaining pressure within the system. Here’s how it integrates with several key engine components:

Accumulator

In the accumulator, the sealing washer ensures that hydraulic fluid remains contained under pressure. This is essential for the accumulator to function correctly, providing a stable supply of pressurized fluid to the system.

Campaign Kit

Within the campaign kit, the sealing washer is used to secure connections and joints. This ensures that all fluids and gases remain within their designated pathways, enhancing the overall reliability of the kit’s components.

Camshaft

When installed in the camshaft system, the sealing washer helps to maintain the integrity of the lubrication system. It prevents oil leaks around the camshaft bearings, ensuring consistent lubrication and reducing wear.

Cooling System Gasket Kit

In the cooling system gasket kit, the sealing washer plays a role in maintaining the seal between various cooling system components. This prevents coolant leaks, ensuring efficient heat dissipation and protecting the engine from overheating.

Corrosion Resistor Location

At the corrosion resistor location, the sealing washer helps to prevent the ingress of moisture and contaminants. This protects the resistor from corrosion, ensuring accurate readings and reliable performance.

Cylinder Block

Within the cylinder block, the sealing washer is used to seal oil passages and coolant channels. This maintains the structural integrity of the block and ensures that fluids do not mix, which could lead to engine damage.

Engine Monitoring System

In the engine monitoring system, the sealing washer ensures that sensors and gauges are accurately reading pressures and temperatures. A secure seal prevents any fluid or gas leaks that could skew readings.

Fluid Doser

The fluid doser relies on the sealing washer to maintain precise control over the dosage of fluids. A secure seal ensures that the correct amount of fluid is delivered, enhancing the efficiency of the dosing process.

Fuel Drain Plumbing

In the fuel drain plumbing, the sealing washer prevents fuel leaks, ensuring that the drainage system operates efficiently and safely. This is vital for maintaining the cleanliness of the fuel system and preventing contamination.

Fuel Filter Plumbing

Within the fuel filter plumbing, the sealing washer ensures that fuel flows smoothly without leaks. This maintains the efficiency of the fuel filtration process, ensuring clean fuel reaches the engine.

Fuel Pump

The fuel pump depends on the sealing washer to maintain pressure within the fuel lines. A secure seal prevents fuel leaks and ensures consistent fuel delivery to the engine.

Fuel Pump Repair Kit

In the fuel pump repair kit, the sealing washer is used to re-establish secure seals within the pump. This is essential for restoring the pump’s functionality and ensuring it operates efficiently.

Fuel Shutoff Valve

The fuel shutoff valve utilizes the sealing washer to ensure a tight seal when the valve is closed. This prevents fuel leaks and ensures the valve can effectively cut off fuel supply when needed.

Fuel System Accessories

In fuel system accessories, the sealing washer is crucial for maintaining the integrity of connections and joints. This ensures that all components within the fuel system operate efficiently and without leaks.

Injector

The injector relies on the sealing washer to maintain a secure seal at the injection point. This ensures that fuel is delivered precisely and prevents leaks that could affect engine performance.

Kit (ISBC Certification and MRC Certification)

In certification kits such as ISBC and MRC, the sealing washer is used to ensure that all components meet stringent standards. A secure seal is essential for maintaining the integrity and performance of certified systems.

Lubricating Oil Transfer Tube

Within the lubricating oil transfer tube, the sealing washer prevents oil leaks, ensuring that the lubrication system operates efficiently and maintains proper oil levels.

Oil Filler Tube

In the oil filler tube, the sealing washer ensures that oil is contained within the system. This prevents spills and ensures that the engine receives the necessary lubrication.

Performance Parts

In performance parts, the sealing washer is used to enhance the reliability and efficiency of high-performance components. A secure seal ensures that these parts operate at their peak performance.

Service Kit

Within the service kit, the sealing washer is essential for maintaining the integrity of various engine components during maintenance procedures. This ensures that the engine continues to operate efficiently post-service.

Tool Certification Kit

In the tool certification kit, the sealing washer is used to ensure that tools maintain accurate readings and functionality. A secure seal is vital for the precision required in certified tools.

Upper Engine Gasket Kit and Upper Engine Gasket Set

In both the upper engine gasket kit and upper engine gasket set, the sealing washer ensures that all gaskets maintain a secure seal. This prevents leaks between engine components, ensuring optimal performance.

XPI JV System Cummins MR

In the XPI JV System Cummins MR, the sealing washer is used to maintain the integrity of the high-pressure fuel system. A secure seal ensures that fuel is delivered at the correct pressure, enhancing engine performance and efficiency.

Conclusion

The 3963990 Sealing Washer by Cummins is a critical component in maintaining the efficiency and reliability of commercial truck systems. Its durable construction, precise fit, and compatibility with a wide range of Cummins engines make it an essential part for preventing leaks and ensuring optimal performance. Regular maintenance and proper installation are key to maximizing the benefits of this part, contributing to the overall longevity and efficiency of the truck’s systems.