3976653
Hexagon Head Cap Screw
Cummins®

The Cummins Hexagon Head Cap Screw, part number 3976653, is a critical component in the maintenance and operation of commercial trucks. This screw ensures the secure fastening of various truck components, contributing to the vehicle’s reliability and performance.

Basic Concepts of Hexagon Head Cap Screws

Hexagon Head Cap Screws are fasteners with a hexagonal head, designed for efficient tightening and loosening using a wrench or socket. These screws convert rotational force into axial force to clamp components securely. They are typically made from materials like steel, stainless steel, or alloy steel, often coated with zinc, black oxide, or other protective finishes to enhance corrosion resistance and durability ².

Purpose of the 3976653 Hexagon Head Cap Screw in Truck Operation

This Cummins part plays a role in securing critical components in commercial trucks, such as engine mounts, transmission housings, and chassis components. Its design ensures these components remain firmly attached under various operating conditions ³.

Key Features of the 3976653 Hexagon Head Cap Screw

The 3976653 features a robust hexagonal head for a secure grip, a fully threaded design for enhanced clamping force, and may include a countersunk head or special coating for improved wear and corrosion resistance ⁴.

Benefits of Using the 3976653 Hexagon Head Cap Screw

Using this part in truck maintenance offers advantages such as improved reliability, durability, easy installation, and long-term performance in demanding environments ¹.

Installation and Usage Guidelines

To install the 3976653, ensure mating surfaces are clean, use a suitable wrench or socket, and tighten gradually to avoid over-tightening. Torque the screw to the manufacturer’s specified values for proper clamping force ².

Troubleshooting Common Issues

Common issues include loosening, corrosion, and damage. Ensure proper torque settings, use screws with protective coatings, and replace damaged screws to maintain component integrity ³.

Maintenance Tips

Regularly inspect the 3976653 for wear, corrosion, or loosening. Clean screw and mating surfaces as needed and follow a scheduled replacement plan based on operating conditions and manufacturer recommendations ⁴.

Cummins: A Brief Overview

Cummins Inc. is a global leader in designing, manufacturing, and distributing engines, filtration, and power generation products. Known for its commitment to quality and innovation, Cummins’ extensive product range includes engines, powertrains, and aftermarket parts designed to meet the demands of commercial transportation ¹.

Cummins Hexagon Head Cap Screw 3976653 in Engine Applications

The 3976653 is a critical component in the assembly and maintenance of several Cummins engine models, ensuring structural integrity and operational efficiency.

K38 and K50 Engines

In the K38 and K50 engine series, the 3976653 is used to secure components within the engine block, ensuring structural integrity and precise torque application ².

QSC8.3 CM850 (CM2850) and QSK50 CM2350 K108 Engines

For these high-performance engines, the 3976653 plays a pivotal role in assembling internal and external components, providing a larger surface area for tools and facilitating easier and more accurate tightening ³.

Role of Part 3976653 Hexagon Head Cap Screw in Engine Systems

The 3976653 is integral to the secure assembly and operation of various engine components, ensuring the integrity and functionality of each part it connects.

Crankcase Breather Arrangement

The screw fastens the breather housing to the crankcase, maintaining the breather’s position and ensuring effective venting of pressure and contaminants ⁴.

Turbocharger Connection

It attaches the turbocharger to the engine block or manifold, withstanding high pressures and temperatures for efficient operation ¹.

Exhaust Outlet and Exhaust Connection Bracket

The screw attaches the exhaust connection bracket to the exhaust manifold or header, maintaining the structural integrity of the exhaust system ².

Marine Engine Applications

In marine engines, the screw secures gear components and ensures robust attachment of parts exposed to harsh marine environments, resisting corrosion and maintaining a tight seal ³.

General Engine Component Arrangement

Across different engine arrangements, the 3976653 secures components such as sensors, brackets, and auxiliary systems, contributing to the overall stability and reliability of the engine system ⁴.

Conclusion

The Cummins Hexagon Head Cap Screw, part number 3976653, is a vital component in the maintenance and operation of commercial trucks and various Cummins engine models. Its robust design, high-strength material, and precise threading contribute to improved reliability, durability, and long-term performance in demanding environments.