3012476
Captive Washer Cap Screw
Cummins®

Introduction

The Cummins 3012476 Captive Washer Cap Screw is a specialized fastener designed for use in heavy-duty truck applications. This component is integral to ensuring secure and reliable connections within the truck’s mechanical systems. Its design incorporates a captive washer that remains attached to the screw, simplifying the assembly process and enhancing the overall functionality of the fastening system.

Basic Concepts of Captive Washer Cap Screws

Captive washer cap screws are a type of fastener that includes an integrated washer, which is held in place by a collar or a groove on the screw shaft. This design ensures that the washer does not become misplaced during installation, streamlining the assembly process. These screws are commonly used in applications where consistent and reliable sealing is required, such as in engine components, transmission systems, and various mechanical assemblies ¹.

Purpose of the Cummins 3012476 Captive Washer Cap Screw

The Cummins 3012476 Captive Washer Cap Screw plays a significant role in heavy-duty truck operations by providing secure fastening in critical areas. It is often used in applications where vibration and dynamic loads are present, ensuring that components remain firmly attached. The screw’s design helps maintain proper sealing, preventing leaks and ensuring the integrity of the mechanical systems it is part of ².

Key Features

The Cummins 3012476 Captive Washer Cap Screw is constructed from high-strength materials, typically alloy steel, to withstand the rigors of heavy-duty applications. It features a coarse thread type, which allows for quick and secure fastening. The captive washer is designed to provide enhanced sealing properties, reducing the risk of fluid leaks. Additionally, the screw’s robust construction ensures durability under demanding conditions ³.

Benefits

Using the Cummins 3012476 Captive Washer Cap Screw offers several advantages. The integrated washer simplifies the assembly process, reducing the likelihood of washer loss and ensuring consistent sealing. The screw’s high-strength material and coarse thread contribute to its durability and reliability under heavy-duty conditions. Furthermore, the design of the captive washer cap screw enhances assembly efficiency and provides a secure fastening solution.

Installation Guidelines

Proper installation of the Cummins 3012476 Captive Washer Cap Screw is crucial for ensuring secure and effective fastening. To install the screw, use a torque wrench to achieve the recommended torque specifications. Ensure that the mating surfaces are clean and free of debris to facilitate a proper seal. It is also important to use the correct tools and techniques to avoid cross-threading and ensure the screw is tightened to the specified torque.

Troubleshooting and Maintenance

Common issues with captive washer cap screws may include loosening due to vibration or corrosion. Regular inspection and maintenance can help identify and address these issues. If loosening is detected, re-torque the screw to the specified value. In cases of corrosion, clean the affected areas and apply an appropriate anti-seize compound to prevent further corrosion. Proper maintenance practices will help prolong the lifespan and ensure the ongoing reliability of the Cummins 3012476 Captive Washer Cap Screw.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration systems, and related technologies. With a history of innovation and a commitment to quality, Cummins serves the automotive and heavy-duty truck industries, providing reliable and efficient power solutions. The company’s extensive product range and dedication to customer satisfaction underscore its reputation as a leader in the industry.

Cummins 3012476 Captive Washer Cap Screw in Cummins Engines

The Cummins 3012476 Captive Washer Cap Screw is a critical component in various Cummins engine models. This part is integral to the assembly and maintenance of the engines, ensuring secure fastening and stability. Here’s how it fits into different Cummins engine families:

G-Series Engines

• G855
• G855 CM558
• GTA855 CM558 (CM2358)
• G101

The G-Series engines, including the G855, G855 CM558, GTA855 CM558, and G101, utilize the Captive Washer Cap Screw in various applications. This screw is essential for securing components within the engine’s framework, ensuring that parts remain tightly fastened and aligned during operation.

ISM and ISX Engines

• ISM CM570
• ISX CM570

In the ISM and ISX series, the Captive Washer Cap Screw is used to maintain the integrity of the engine’s internal and external structures. These engines benefit from the screw’s ability to provide a reliable and secure fastening solution, which is crucial for the high-performance demands of these models.

K-Series Engines

• K19
• K38
• K50
• KTA19GC
• KTA19GC CM558

The K-Series engines, such as the K19, K38, K50, KTA19GC, and KTA19GC CM558, incorporate the Captive Washer Cap Screw in their design. This screw is used to fasten various components, ensuring that the engine’s parts remain securely in place, which is vital for the engine’s overall performance and longevity.

L-Series Engines

• L10 CELECT
• L10 MECHANICAL
• M11 CELECT
• M11 CELECT PLUS
• M11 MECHANICAL

The L-Series and M11 engines, including the L10 CELECT, L10 MECHANICAL, M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL, utilize the Captive Washer Cap Screw for securing components within the engine. This screw is essential for maintaining the structural integrity of these engines, ensuring that all parts are tightly fastened and properly aligned.

N-Series Engines

• N14 CELECT
• N14 CELECT PLUS
• N14 G
• N14 MECHANICAL

The N14 engines, such as the N14 CELECT, N14 CELECT PLUS, N14 G, and N14 MECHANICAL, rely on the Captive Washer Cap Screw for various fastening applications. This screw is crucial for securing components within the engine, ensuring that all parts remain tightly fastened and properly aligned, which is essential for the engine’s performance and durability.

QSK Engines

• QSK19 CM2350 K105
• QSK19 CM2350 K114
• QSK19 CM2350 K144G
• QSK19 CM500
• QSK19 CM850 MCRS

The QSK series engines, including the QSK19 CM2350 K105, QSK19 CM2350 K114, QSK19 CM2350 K144G, QSK19 CM500, and QSK19 CM850 MCRS, incorporate the Captive Washer Cap Screw in their design. This screw is used to fasten various components within the engine, ensuring that all parts remain securely in place, which is vital for the engine’s overall performance and reliability.

Role of Cummins 3012476 Captive Washer Cap Screw in Various Engine Systems

The Cummins 3012476 Captive Washer Cap Screw is a versatile fastener utilized across a multitude of engine systems to ensure secure and reliable connections. Its application spans several critical components, contributing to the overall integrity and functionality of the engine.

In the accessory drive system, this screw plays a part in attaching various driven components to the engine, ensuring they operate in sync with the engine’s rotation. For the air 2-cylinder compressor and general air compressor systems, it secures components such as the air compressor head and the air mounting manifold, maintaining the structural stability necessary for efficient air compression and delivery.

Within the auxiliary cooling system, the 3012476 screw is employed to fasten the baffle and tube mounting structures, which are essential for directing airflow and enhancing cooling efficiency. It also finds use in the cover mounting gear and gear cover mounting, where it ensures that these covers remain securely in place, protecting internal components from debris and external elements.

For the EBM:Compressor,Air and electronic service calibration systems, this screw is integral in securing components that are vital for precise calibration and operation of the compressor. In the fan drive arrangement, it helps in attaching the fan to the engine, ensuring effective air circulation for cooling purposes.

The screw is also utilized in the filter and cooler assemblies, including the oil filter and cooler, to maintain the structural integrity of these components, which are crucial for filtering contaminants and cooling the engine oil. In the front cover and front gear cover, it ensures these covers are tightly secured, protecting the internal gear mechanisms.

For the gear housing mounting cover and intake manifold, the 3012476 screw provides the necessary fastening to ensure these components are securely attached to the engine, facilitating smooth operation and preventing leaks.

In systems involving the lubricating oil cooler and t c cooler, as well as the lubricating pump flange, this screw ensures that these components are firmly mounted, contributing to the efficient lubrication and cooling of engine parts. It also plays a role in securing the mounting tube and oil cooler, which are essential for the proper functioning of the oil cooling system.

Lastly, in the torque converter system, the screw is used to fasten components that are critical for the transmission of torque from the engine to the transmission, ensuring smooth and efficient power transfer.

Overall, the Cummins 3012476 Captive Washer Cap Screw is a fundamental component in maintaining the structural integrity and operational efficiency of various engine systems.

Conclusion

The Cummins 3012476 Captive Washer Cap Screw is a critical component in heavy-duty truck applications, providing secure and reliable fastening across a wide range of engine systems. Its design, featuring a captive washer and high-strength materials, ensures durability and efficiency in demanding conditions. Proper installation and maintenance are essential to maximize its benefits and ensure the longevity of the fastening solution.