3683919
Shoulder Cap Screw
Cummins®

Introduction

The Shoulder Cap Screw 3683919, a specialized fastener produced by Cummins, is designed for various applications within commercial trucks. It plays a significant role in securing components and ensuring the structural integrity of the vehicle ³.

Basic Concepts of Shoulder Cap Screws

A shoulder cap screw features a cylindrical shoulder under the head, providing a bearing surface that supports an axial load. These screws are used in mechanical assemblies to secure components while ensuring precise fit and alignment. The shoulder prevents the screw from bottoming out in the hole, maintaining the security of fastened components ¹.

Purpose of the 3683919 Shoulder Cap Screw in Truck Operation

The 3683919 Shoulder Cap Screw is integral to the operation and maintenance of commercial trucks. It is commonly used in engine assemblies, transmission systems, and other critical areas where vibration and load distribution are concerns. Its role is to maintain the alignment and security of components under varying operational conditions ².

Key Features

The 3683919 Shoulder Cap Screw is characterized by several distinctive features:

• Made from high-strength materials such as alloy steel.
• Features a specific thread type for a tight and secure fit.
• Includes a shoulder that supports axial loads and prevents over-tightening.

These features contribute to the screw’s reliability in demanding applications ³.

Benefits

Using the 3683919 Shoulder Cap Screw offers several advantages:

• Improved load distribution across fastened components.
• Enhanced overall stability of the assembly.
• Resistance to vibration and corrosion, ensuring longevity in harsh operating environments.

These benefits make it a preferred choice for critical applications in commercial trucks ¹.

Installation Guidelines

Proper installation of the 3683919 Shoulder Cap Screw is vital for optimal performance and longevity. The installation process should include:

• Cleaning mating surfaces to remove debris or contaminants.
• Inserting the screw into the pre-drilled hole, ensuring the shoulder aligns correctly.
• Following torque specifications provided by the manufacturer to achieve the correct tightness without over-tightening.

Troubleshooting and Maintenance

Common issues with shoulder cap screws include loosening due to vibration, corrosion, and wear. Regular inspection and maintenance can help identify these problems early. If a screw is found to be loose, it should be re-tightened to the specified torque. In cases of corrosion, the affected area should be cleaned, and anti-corrosive treatments may be applied. Replacing worn or damaged screws is also a standard maintenance practice to ensure continued reliability ².

Safety Considerations

When working with the 3683919 Shoulder Cap Screw, several safety practices should be observed:

• Proper handling to avoid injury or damage.
• Using the correct tools and following torque specifications to prevent over-tightening.
• Protecting the screw from corrosive substances to maintain its integrity and performance.

Cummins 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 commercial truck industry for producing reliable and high-performance components. The company’s extensive product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of commercial transportation ³.

Shoulder Cap Screw 3683919 Compatibility with Cummins Engines

The Shoulder Cap Screw part number 3683919, manufactured by Cummins, is a critical component in the assembly and maintenance of various Cummins engines. This screw is designed to secure specific parts within the engine, ensuring structural integrity and operational efficiency. Here is a detailed overview of its compatibility across different Cummins engine models:

ISB Series

• ISB CM2150
• ISB6.7 CM2250
• ISB6.7 CM2350 B101

ISC Series

• ISC CM2150
• ISC8.3 CM2250

ISL Series

• ISL CM2150
• ISL9 CM2250

ISM Series

• ISM CM570/870
• ISM CM876
• ISM11 CM876 SN

ISX Series

• ISX CM871
• ISX15 CM2250
• ISX15 CM2350 X101

QSC and QSL Series

• QSC9 CM2250/QSL9 CM2250
• QSL9 CM2350 L102

QSK19G, QSM11, and QSX Series

• QSK19G
• QSM11 CM876
• QSX15 CM2250
• QSX15 CM2250 ECF
• QSX15 CM2350 X105
• X15 CM2350 X116B

Role of Part 3683919 Shoulder Cap Screw in Engine Systems

The Part 3683919 Shoulder Cap Screw is instrumental in securing and maintaining the integrity of various engine components. In the arrangement of the engine, this screw ensures that parts are held firmly in place, reducing the risk of misalignment or detachment during operation.

Within the crankcase breather system, the Shoulder Cap Screw plays a significant role. It secures the breather components, ensuring that the crankcase ventilation system functions correctly. This system is essential for releasing pressure built up within the crankcase, which is vital for maintaining engine efficiency and longevity.

The breather itself, which is a component of the crankcase breather system, relies on the secure fastening provided by the Shoulder Cap Screw. This ensures that the breather can effectively vent gases and moisture from the crankcase, preventing contamination of the engine oil and maintaining optimal engine performance.

In the crankcase, the screw is used to fasten various covers and plates, ensuring that the crankcase remains sealed and protected from external contaminants. This sealing is essential for maintaining the lubrication system’s integrity and preventing oil leaks.

The oil separator breather is another component where the Shoulder Cap Screw is vital. By securely attaching the oil separator to the breather system, it ensures that the oil separator can effectively separate oil mist from the crankcase vapors, which is then returned to the sump. This process helps in maintaining clean crankcase vapors and prolonging the life of the engine.

Lastly, in the valve cover, the Shoulder Cap Screw is used to ensure that the cover is tightly sealed against the cylinder head. This seal is important for preventing oil leaks and ensuring that the valvetrain components are properly lubricated and protected.

Conclusion

The 3683919 Shoulder Cap Screw by Cummins is a critical component in the maintenance and operation of commercial trucks and various Cummins engines. Its design and features ensure secure fastening, precise alignment, and durability in demanding applications. Proper installation, regular maintenance, and adherence to safety practices are essential for maximizing the performance and longevity of this Cummins part.