3086278
Plain Washer
Cummins®

Introduction

The Cummins 3086278 Plain Washer is a specialized component designed for use in heavy-duty truck applications. Its purpose is to provide a smooth bearing surface between mating parts, reducing friction and wear. This part plays a role in ensuring the efficient and reliable operation of various truck components by distributing loads evenly and preventing direct metal-to-metal contact.

Basic Concepts of Plain Washers

Plain washers are simple yet vital components in mechanical systems. They are typically flat, annular devices made from metal, plastic, or other materials. Their general function is to distribute the load of a fastener, such as a bolt or screw, over a larger area. This helps to prevent damage to the surface and provides a consistent bearing surface. Plain washers also play a role in maintaining proper alignment and spacing between components, which is crucial for the integrity and performance of mechanical assemblies ¹.

Purpose of the Cummins 3086278 Plain Washer

The Cummins 3086278 Plain Washer is specifically designed to enhance the performance and longevity of heavy-duty truck components. It is applied in various truck systems where reliable load distribution and minimal friction are required. This washer helps in maintaining the structural integrity of fasteners by providing a uniform load distribution, which reduces the risk of galling and seizing. Additionally, it aids in the prevention of surface damage to critical components, ensuring smooth operation and extended service life.

Key Features

The Cummins 3086278 Plain Washer is characterized by several key features that make it suitable for heavy-duty applications. It is typically made from high-strength materials such as stainless steel or hardened steel, ensuring durability under demanding conditions. The washer has precise dimensions to fit specific applications, with a smooth surface finish that minimizes friction. Its design includes features that enhance load distribution and alignment, contributing to the overall reliability of the truck’s mechanical systems.

Benefits

Using the Cummins 3086278 Plain Washer offers several benefits. It improves load distribution, which helps to prevent overloading and damage to connected components. The washer also plays a role in reducing friction between mating parts, which can lead to enhanced efficiency and reduced wear. Additionally, its durable construction ensures long-lasting performance in harsh operating environments, contributing to the overall reliability and maintenance of heavy-duty trucks.

Installation Considerations

Proper installation of the Cummins 3086278 Plain Washer is vital to ensure optimal performance. It should be placed correctly between the fastener and the surface to be secured. Adherence to recommended torque settings is important to avoid over-tightening, which can lead to washer deformation or component damage. Alignment should be checked to ensure that the washer is positioned correctly and that it provides the intended load distribution and friction reduction.

Troubleshooting and Maintenance

Common issues with plain washers include deformation, corrosion, and wear. Regular inspection for signs of damage or wear is recommended to identify problems early. Maintenance tips include ensuring proper installation, using the correct torque settings, and replacing washers as needed to prevent failure of the fastening system. Keeping the washer and surrounding components clean and free of contaminants can also prolong its lifespan.

Manufacturer Information - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and related technologies. With a strong reputation in the automotive industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive experience and dedication to advancing technology ensure that its components, like the Cummins 3086278 Plain Washer, meet the high standards required for heavy-duty applications.

Compatibility with Cummins Engines

The Plain Washer part number 3086278, manufactured by Cummins, is designed to fit a variety of Cummins engines. This washer is a crucial component in ensuring proper assembly and function of engine parts. Below is a detailed description of how this washer fits with the specified engines:

QSK19 Series Engines

• QSK19 CM2350 K144G
• QSK19 CM2350
• QSK19 CM500
• QSK19 CM850 MCRS
• QSK19G

The Plain Washer 3086278 is compatible with the QSK19 series engines, including models such as the QSK19 CM2350 K144G, QSK19 CM2350, QSK19 CM500, QSK19 CM850 MCRS, and QSK19G. This washer is used in various locations within these engines to secure components and ensure proper alignment.

QST30 Series Engines

• QST30 CM2350 T101
• QST30 CM552

The Plain Washer 3086278 also fits the QST30 series engines, specifically the QST30 CM2350 T101 and QST30 CM552. This washer is integral in maintaining the structural integrity and operational efficiency of these engines by providing a stable and secure fit in designated areas.

Grouping of Engines

The engines listed can be grouped based on their series and model numbers. The QSK19 series and QST30 series engines share the Plain Washer 3086278 as a common component, highlighting its versatility and importance in Cummins engine designs. This compatibility ensures that maintenance and repair processes can be standardized across these engine models, facilitating easier part management and inventory control.

Role of Part 3086278 Plain Washer in Engine Systems

In engine systems, the part 3086278 Plain Washer is utilized in various components to ensure smooth operation and efficient performance.

Belt Tensioner

The Plain Washer is integrated into the belt tensioner mechanism. It facilitates the proper tensioning of the drive belt, which is essential for the transfer of power from the engine to other components such as the alternator, water pump, and air conditioning compressor. The washer ensures that there is minimal friction and wear between moving parts, contributing to the longevity and reliability of the belt tensioner.

Drive Components

In drive systems, the Plain Washer is employed to maintain the alignment and spacing between components. This is particularly important in the fan drive and fan drive idle assembly, where precise movement and minimal friction are required for optimal performance. The washer helps in reducing wear on the drive components, ensuring that they operate efficiently over time.

Idler Assemblies

The idler lever and idler pulley are components where the Plain Washer plays a significant role. In the idler lever, the washer ensures that the lever can pivot smoothly without excessive friction, which is vital for the proper functioning of the idler system. Similarly, in the idler pulley, the washer helps in maintaining the correct tension and alignment of the belt, which is crucial for the efficient operation of the engine’s auxiliary systems.

Conclusion

Overall, the Cummins 3086278 Plain Washer is a small yet essential component that contributes to the smooth and efficient operation of various engine systems. Its role in reducing friction, maintaining alignment, and ensuring proper tensioning cannot be overstated. Proper installation, regular maintenance, and understanding its compatibility with specific Cummins engines are key to maximizing the benefits of this part.