3012472
Captive Washer Cap Screw
Cummins®

Introduction

The Captive Washer Cap Screw Part #3012472 is a specialized fastener produced by Cummins, a well-established manufacturer known for its high-quality automotive components. This screw is designed for use in commercial trucks, where it plays a significant role in the assembly and maintenance of various truck components.

Basic Concepts of Captive Washer Cap Screws

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer. This design ensures that the washer remains in place during installation, reducing the risk of loss and simplifying the fastening process. The screw typically consists of a threaded shaft, a head for applying torque, and the captive washer, which distributes pressure and prevents damage to the fastened material ¹.

Purpose of the 3012472 Captive Washer Cap Screw in Truck Operations

The 3012472 Captive Washer Cap Screw is utilized in the assembly and maintenance of commercial trucks to secure various components. It is commonly employed in applications where consistent and reliable fastening is required, such as in the attachment of panels, brackets, and other structural elements. Its design ensures that the washer stays in position, providing a more uniform distribution of clamping force and enhancing the overall stability of the fastened components.

Key Features of the 3012472 Captive Washer Cap Screw

The 3012472 Captive Washer Cap Screw boasts several key features that enhance its performance. Its design includes a robust threaded shaft made from high-strength material, ensuring durability under heavy loads. The integrated washer is crafted to provide optimal pressure distribution, minimizing the risk of damage to the fastened surfaces. Additionally, the screw’s head is designed for easy torque application, facilitating efficient installation.

Benefits of Using the 3012472 Captive Washer Cap Screw

Utilizing the 3012472 Captive Washer Cap Screw offers several advantages. The integrated washer simplifies the installation process by eliminating the need for separate washers, which can be prone to loss or misplacement. This feature enhances reliability and reduces the time required for fastening operations. Furthermore, the consistent pressure distribution provided by the captive washer contributes to improved fastening integrity, potentially leading to cost savings in maintenance by reducing the frequency of fastening failures.

Installation Process

Proper installation of the 3012472 Captive Washer Cap Screw involves several steps to ensure secure fastening. Begin by aligning the screw with the designated hole in the component to be fastened. Using an appropriate torque wrench, apply the recommended torque specification to the screw head, ensuring that the washer is properly seated and the components are drawn together securely. It is important to follow the manufacturer’s guidelines for torque settings to avoid over-tightening, which can lead to damage, or under-tightening, which can compromise the fastening integrity.

Troubleshooting Common Issues

Common issues that may arise with the 3012472 Captive Washer Cap Screw include loosening due to vibration or corrosion. To address loosening, ensure that the screw is properly torqued during installation and consider the use of thread-locking compounds in applications where vibration is a concern. Corrosion can be mitigated by selecting screws made from corrosion-resistant materials and by applying protective coatings where necessary. Regular inspection and maintenance can help identify and address these issues promptly.

Maintenance Tips

To ensure the longevity and consistent performance of the 3012472 Captive Washer Cap Screw, regular maintenance is recommended. Inspect the screws periodically for signs of loosening, corrosion, or damage. Cleaning the screw and surrounding area can prevent the accumulation of debris that may contribute to corrosion. Additionally, reapplying thread-locking compounds as needed can help maintain the integrity of the fastening.

Cummins: Manufacturer Overview

Cummins is a renowned manufacturer with a rich history in the automotive industry. The company is recognized for its commitment to quality and innovation in the production of automotive components. Cummins’ reputation is built on a foundation of rigorous testing, adherence to industry standards, and a dedication to continuous improvement. This commitment ensures that their products, including the 3012472 Captive Washer Cap Screw, meet the high demands of commercial truck applications ².

Cummins Captive Washer Cap Screw 3012472 in Engine Applications

The Cummins Captive Washer Cap Screw part number 3012472 is a critical component used in various Cummins engines. This part is designed to secure and hold components in place, ensuring the integrity and functionality of the engine. Below is a detailed description of how this part fits into different Cummins engine models:

Cummins 4B3.9 and 6B5.9 Engines

In the 4B3.9 and 6B5.9 engines, the 3012472 screw is used to fasten various parts, ensuring that the engine’s internal components remain securely attached. This is crucial for maintaining the engine’s operational efficiency and preventing any potential failures due to loose parts.

Cummins 6C8.3 and 6C8.3 G Engines

For the 6C8.3 and 6C8.3 G engines, the 3012472 screw is employed in several key areas. It is used to secure the cylinder heads, ensuring a tight seal that prevents leaks and maintains the engine’s compression. Additionally, it is used in the assembly of the engine block, where it helps to keep the various sections tightly bound together.

Cummins K19, K38, and K50 Engines

In the K19, K38, and K50 engines, the 3012472 screw is utilized to fasten components such as the turbocharger and exhaust manifold. This ensures that these high-stress parts remain securely in place, contributing to the engine’s overall performance and longevity.

Cummins KTA19GC, KTA19GC CM558, and KTA38GC CM558 Engines

For the KTA19GC, KTA19GC CM558, and KTA38GC CM558 engines, the 3012472 screw is used in the assembly of the engine’s fuel injection system. It is also used to secure the engine’s cooling system components, ensuring that the engine operates within its optimal temperature range.

Cummins L10 CELECT, L10 GAS, and L10 MECHANICAL Engines

In the L10 CELECT, L10 GAS, and L10 MECHANICAL engines, the 3012472 screw is used to fasten the engine’s valve train components. This includes securing the camshaft and valve covers, which are critical for the engine’s timing and valve operation.

Cummins M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL Engines

For the M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL engines, the 3012472 screw is used to secure the engine’s turbocharging system. It is also used in the assembly of the engine’s exhaust system, ensuring that all components are tightly fastened and properly aligned.

Cummins N14 CELECT Engine

In the N14 CELECT engine, the 3012472 screw is used to fasten the engine’s cylinder heads and other critical components. This ensures that the engine’s internal parts remain securely in place, contributing to the engine’s overall reliability and performance.

Cummins C GAS PLUS CM556, ISB CM550, ISC CM554, ISL CM554, ISM CM570, ISX CM570, and G855 Engines

For the C GAS PLUS CM556, ISB CM550, ISC CM554, ISL CM554, ISM CM570, ISX CM570, and G855 engines, the 3012472 screw is used in various applications, including securing the engine’s fuel injection system, turbocharger, and exhaust manifold. It is also used in the assembly of the engine’s cooling system and valve train components.

Role of Part 3012472 Captive Washer Cap Screw in Engine Systems

The part 3012472 Captive Washer Cap Screw is integral to the secure assembly and operation of various engine components. Its application spans across multiple systems, ensuring the integrity and efficiency of the engine.

Accessory Drive Pull

In the accessory drive pull system, the 3012472 Captive Washer Cap Screw is used to fasten components that drive accessories such as alternators and water pumps. This ensures that these accessories remain firmly attached and operate smoothly.

Air Cleaner and Air Cleaner Mounting

For the air cleaner and its mounting, this screw plays a role in securing the air cleaner housing to the engine block or chassis. Proper mounting is essential for maintaining the air flow efficiency and preventing any air leaks.

Air Compressor and Auxiliary Pump Drive

In air compressors and auxiliary pump drives, the screw is employed to attach critical components that ensure the compressor and pump function correctly. This includes securing belts, pulleys, and other drive components.

Breather & Valve Cover and Connection and Crossover

The breather and valve cover, along with connection and crossover components, rely on the 3012472 Captive Washer Cap Screw to maintain a sealed environment. This prevents oil leaks and ensures that the crankcase ventilation system operates effectively.

Cover, Valve Mounting, and Flywheel Housing Adapter

These components require precise mounting to the engine block. The screw ensures that covers and adapters are securely fastened, which is vital for the structural integrity and operational safety of the engine.

Front Gear Housing Mounting Cover

The front gear housing mounting cover is another area where this screw is utilized. It helps in securing the cover to the gear housing, ensuring that the gears operate within their designed parameters without undue stress or misalignment.

Fuel Filter and Turbocharger Mounting Bracket

For the fuel filter and turbocharger mounting bracket, the screw is essential in attaching these components to the engine. This ensures that the fuel system and turbocharger are securely mounted, contributing to the overall performance and reliability of the engine.

Fuel Mounting Bracket and Fuel Supply Plumbing

In the fuel system, the screw is used in the fuel mounting bracket and fuel supply plumbing to ensure that all connections are tight and secure. This is important for maintaining fuel pressure and preventing leaks.

Gear Housing and Hydraulic Pump Pulley

The gear housing and hydraulic pump pulley are critical for the transmission of power within the engine. The screw ensures that these components are correctly mounted and aligned, which is essential for the smooth operation of the engine.

Lubricating Oil Filter Cooler and Noise Mounting Panel

For the lubricating oil filter cooler and noise mounting panel, the screw helps in securing these components to the engine or chassis. This is important for maintaining the efficiency of the oil cooling system and reducing engine noise.

Oil Cooler Cover and Oil Pan Mounting Adapter

The oil cooler cover and oil pan mounting adapter require secure fastening to prevent oil leaks and ensure efficient cooling. The screw plays a key role in this application.

Rear Clutch and Tube Support Mounting

In the rear clutch and tube support mounting, the screw is used to ensure that these components are firmly attached. This is crucial for the proper functioning of the clutch and the structural integrity of the engine.

Turbocharger Mounting and Turbocharger Mounting Kit

For turbochargers, the screw is used in both the turbocharger mounting and the turbocharger mounting kit. This ensures that the turbocharger is securely attached to the engine, which is vital for its performance and durability.

Vacuum Pump and Wiring Harness

Finally, in the vacuum pump and wiring harness, the screw is used to secure these components to the engine or chassis. This ensures that the vacuum pump operates efficiently and that the wiring harness remains protected and in place.

Conclusion

The 3012472 Captive Washer Cap Screw by Cummins is a critical component in the assembly and maintenance of commercial trucks and various Cummins engines. Its design, featuring an integrated washer, ensures reliable and consistent fastening, which is essential for the operational integrity of truck and engine components. Proper installation, regular maintenance, and addressing common issues such as loosening and corrosion are key to maximizing the performance and longevity of this Cummins part.