4896991
Studded Captive Washer Screw
Cummins®

The 4896991 Studded Captive Washer Screw by Cummins is a specialized fastener designed for use in heavy-duty truck maintenance and operation. This component is integral to ensuring the secure attachment of various parts within the truck’s engine and other systems, contributing to the overall reliability and performance of the vehicle.

Basic Concepts of Studded Captive Washer Screws

Studded captive washer screws are a type of fastener that includes a washer integrated into the screw design. This design allows for efficient and secure fastening, reducing the likelihood of the washer becoming misplaced during installation. These screws are commonly used in mechanical systems where vibration and movement are prevalent, as they help maintain a consistent and secure connection between components ¹.

Purpose and Role in Truck Operation

The 4896991 Studded Captive Washer Screw plays a specific role in the operation of heavy-duty trucks. It is utilized in the engine and other critical systems to ensure that components remain firmly attached under various operating conditions. By providing a stable and secure connection, this screw helps maintain the integrity of the truck’s systems, contributing to efficient and reliable performance ².

Key Features

The 4896991 Studded Captive Washer Screw boasts several key features that enhance its performance. Its design includes an integrated washer, which simplifies the installation process and ensures a secure fit. The screw is made from high-quality materials, offering durability and resistance to wear and corrosion. Additionally, the studded design provides extra stability, making it suitable for use in high-vibration environments ³.

Benefits

Using the 4896991 Studded Captive Washer Screw offers several benefits. The integrated washer design streamlines the installation process, reducing the risk of washer loss and ensuring a consistent fit. The high-quality materials used in its construction contribute to improved durability and performance, even in demanding conditions. Furthermore, the studded design enhances stability, making it an ideal choice for applications where vibration is a concern ⁴.

Installation Process

Proper installation of the 4896991 Studded Captive Washer Screw involves several steps. First, ensure that the mating surfaces are clean and free of debris. Use the appropriate tool to drive the screw into place, taking care to apply even pressure to avoid cross-threading. It is important to tighten the screw to the manufacturer’s specified torque settings to ensure a secure fit without over-tightening, which could damage the screw or the surrounding components .

Troubleshooting Common Issues

Common issues associated with studded captive washer screws include loosening over time due to vibration and corrosion in harsh environments. To address these problems, regularly inspect the screws for signs of wear or corrosion. If loosening is detected, re-tighten the screw to the specified torque settings. In cases of corrosion, consider replacing the screw to prevent further degradation and ensure continued reliable performance .

Maintenance Tips

To ensure the longevity and optimal performance of the 4896991 Studded Captive Washer Screw, regular maintenance is recommended. Inspect the screws at routine intervals for signs of wear, corrosion, or loosening. Clean the mating surfaces as needed to remove any debris that could affect the screw’s performance. Additionally, applying a corrosion-resistant coating can help protect the screw in harsh environments, extending its service life .

Cummins: A Brief 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 strong reputation in the heavy-duty truck industry for producing reliable and high-performance components. The company’s extensive product range includes engines, powertrains, and aftermarket parts, all designed to meet the demanding requirements of heavy-duty applications.

Cummins Engine Part 4896991: Studded Captive Washer Screw

The Studded Captive Washer Screw part number 4896991, manufactured by Cummins, is a critical component used in various Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening and stability.

Application in Cummins Engines

B Series Engines

• B4.5 RGT
• B5.6 CM2670 B152B
• B6.7 CM2670 B153B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C

The Studded Captive Washer Screw is utilized in the B series engines to secure various components, ensuring that parts remain tightly fastened under operational stress.

ISB Series Engines

• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB6.7 CM2250

In the ISB series engines, the Studded Captive Washer Screw is employed to maintain the integrity of the engine’s structure, particularly in areas where high torque and vibration are common.

ISBE Series Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

For the ISBE series engines, this screw is used to ensure that critical components are securely fastened, contributing to the overall reliability and performance of the engine.

ISD Series Engines

• ISD4.5 CM2220 D108

In the ISD4.5 CM2220 D108 engine, the Studded Captive Washer Screw is essential for maintaining the structural integrity of the engine, especially in high-stress areas.

ISF Series Engines

• ISF3.8 CM2220 AN

For the ISF3.8 CM2220 AN engine, this screw is used to ensure that various parts are securely fastened, contributing to the engine’s overall durability and performance.

QSB Series Engines

• QSB4.5 CM2250 EC
• QSB4.5 CM850 (CM2850)
• QSB5.9 CM2880 B115
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

In the QSB series engines, the Studded Captive Washer Screw is used to secure various components, ensuring that parts remain tightly fastened under operational stress. This is particularly important in engines designed for heavy-duty applications.

Role of Part 4896991 Studded Captive Washer Screw in Engine Systems

The 4896991 studded captive washer screw is an integral component in the assembly and securement of various engine parts. Its primary function is to provide a robust fastening solution that ensures components remain securely in place under the dynamic and high-stress conditions of engine operation.

In the valve cover arrangement, the 4896991 screw is utilized to fasten the valve cover to the engine block. This securement is vital for maintaining the integrity of the valve cover, ensuring it remains sealed and does not shift during engine operation, which could lead to oil leaks and compromised performance.

Within the rocker lever housing, the screw plays a significant role in attaching the housing to the engine block. This securement is essential for the stability of the rocker levers, which are responsible for transferring motion from the camshaft to the valves. Proper fastening ensures that the rocker levers operate efficiently without undue movement or wear.

In the context of turbocharger plumbing, the 4896991 screw is employed to secure various plumbing components, such as hoses and fittings, to the engine block or turbocharger housing. This ensures that the plumbing remains intact under the high pressures and temperatures associated with turbocharged systems, maintaining the efficiency and reliability of the turbocharger.

Additionally, the screw is used in the long block assembly to fasten components such as the valve cover and other ancillary parts. This contributes to the overall structural integrity of the engine, ensuring that all components are held firmly in place during operation.

Overall, the 4896991 studded captive washer screw is a versatile and reliable fastening solution that enhances the security and performance of various engine components.

Conclusion

The 4896991 Studded Captive Washer Screw by Cummins is a critical component in the maintenance and operation of heavy-duty trucks. Its design, featuring an integrated washer and high-quality materials, ensures secure and durable fastening in high-vibration environments. Proper installation, regular maintenance, and timely troubleshooting are essential to maximize the performance and longevity of this Cummins part. Its application across various Cummins engine models underscores its importance in ensuring the reliability and efficiency of heavy-duty engines.