3013904
Captive Washer Cap Screw
Cummins®

Introduction

The Cummins 3013904 Captive Washer Cap Screw is a specialized fastener designed for use in commercial trucks. It is engineered to provide secure and reliable fastening in various truck components, ensuring both efficiency and durability in demanding environments.

Basic Concepts of Captive Washer Cap Screws

Captive washer cap screws are a type of fastener that includes an integrated washer held in place by a collar or step on the screw shaft. This design ensures that the washer remains attached to the screw during installation, reducing the risk of washer loss and simplifying the assembly process. These screws are commonly used in mechanical assemblies where consistent and reliable fastening is required ¹.

Purpose of the Cummins 3013904 Captive Washer Cap Screw

This Cummins part plays a role in the operation and maintenance of commercial trucks by providing a secure fastening solution. It is used in applications where the integrity of the fastening is critical, such as in engine components, chassis parts, and other structural assemblies. The integrated washer helps distribute the load more evenly, reducing the risk of damage to the fastened materials ².

Key Features

The Cummins 3013904 Captive Washer Cap Screw features a robust design with a hex head for easy installation using standard tools. The screw is made from high-strength materials to withstand the rigors of commercial truck use. Its captive washer is securely held in place by a collar, ensuring it remains attached during installation. Additionally, the screw is coated to provide corrosion resistance, enhancing its longevity in various operating conditions ³.

Benefits

Using the Cummins 3013904 Captive Washer Cap Screw offers several advantages. The integrated washer simplifies the installation process by eliminating the need to handle separate washers, which can be particularly beneficial in automated or high-volume assembly lines. The design also reduces the risk of washer loss, ensuring consistent fastening quality. Furthermore, the high-strength material and corrosion-resistant coating contribute to enhanced structural integrity and durability.

Installation Process

To install the Cummins 3013904 Captive Washer Cap Screw, begin by ensuring the mating surfaces are clean and free of debris. Position the screw over the designated hole and use a socket wrench to tighten it to the manufacturer’s specified torque settings. It is important to avoid over-tightening, which can lead to damage. Regularly check the screw during the tightening process to ensure the washer remains in place and the screw is aligned correctly.

Common Applications

The Cummins 3013904 Captive Washer Cap Screw is typically used in various commercial truck systems and components. Common applications include fastening engine components, securing chassis parts, and assembling structural elements. Its versatility and reliability make it a preferred choice for many critical fastening tasks in the commercial truck industry.

Troubleshooting and Maintenance

To maintain the Cummins 3013904 Captive Washer Cap Screw, regularly inspect it for signs of wear, corrosion, or damage. If the screw shows signs of loosening or the washer appears worn, it may be necessary to replace it to ensure continued secure fastening. Routine maintenance should include cleaning the screw and its surroundings to prevent the accumulation of dirt and debris, which can affect performance.

Manufacturer Information - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and related technologies. With a strong reputation in the commercial truck industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and robust engineering ensure that their components, like the Cummins 3013904 Captive Washer Cap Screw, meet the high demands of commercial truck applications.

Cummins Captive Washer Cap Screw 3013904 Compatibility

The Cummins Captive Washer Cap Screw part number 3013904 is a versatile component that is compatible with a range of Cummins engines. This part is designed to provide secure fastening and is integral to the assembly and maintenance of various engine models.

Compatible Engines

• G855
• K19
• K38
• K50
• KTA19GC
• KTA38GC CM558
• L10 MECHANICAL
• M11 CELECT PLUS
• M11 MECHANICAL
• N14 CELECT
• N14 CELECT PLUS
• N14 G
• N14 MECHANICAL
• NH/NT 855
• QSK19 CM500
• QSK50 CM2150 K107
• QSK50 CM2150 MCRS
• QSN14 CM876 N103
• QSNT14 CM876 N102
• V28
• V903

Grouping of Compatible Engines

The engines listed can be grouped based on their series and common characteristics:

• K Series: K19, K38, K50
• KTA Series: KTA19GC, KTA38GC CM558
• L Series: L10 MECHANICAL
• M Series: M11 CELECT PLUS, M11 MECHANICAL
• N Series: N14 CELECT, N14 CELECT PLUS, N14 G, N14 MECHANICAL, QSN14 CM876 N103, QSNT14 CM876 N102
• QSK Series: QSK19 CM500, QSK50 CM2150 K107, QSK50 CM2150 MCRS
• V Series: V28, V903
• Others: G855, NH/NT 855

This grouping helps in understanding the broader application of the part across different engine series, facilitating easier inventory management and part replacement for technicians and engineers working with these engines.

Role of Part 3013904 Captive Washer Cap Screw in Various Engine Components

The 3013904 Captive Washer Cap Screw is instrumental in securing and maintaining the integrity of several key components within engine systems. Its application spans across a variety of parts, ensuring stability, alignment, and efficient operation.

Aftercooler Conversion Kit

In the aftercooler conversion kit, the 3013904 screw is used to fasten components securely, ensuring that the aftercooler is properly mounted and aligned. This is essential for optimal cooling performance and efficient air-fuel mixture.

Air Intake Manifold Mounting

For the air intake manifold, the screw plays a vital role in securing the manifold to the engine block. This ensures a tight seal and proper airflow into the engine, which is critical for engine performance.

Belt Guard and Belt Shield Alternator

In the belt guard and belt shield alternator setups, the 3013904 screw is utilized to secure the belt guard and shield in place. This protects the alternator belt from wear and ensures consistent power generation.

Block Cylinder Components

Across various block cylinder configurations such as the NTC-350, NH-855, and water heater blocks, the screw is employed to secure cylinder heads, gaskets, and other critical components. This ensures proper sealing and structural integrity.

Coolant Heater Starting Aid

For the coolant heater starting aid, the screw is used to mount the heater securely to the engine block. This aids in preheating the engine coolant, facilitating easier starts in cold conditions.

Damper Guard and Fan Guard Mounting

In damper guard and fan guard mounting applications, the screw ensures that these guards are firmly attached, protecting internal components from debris and ensuring smooth operation of the cooling system.

Fuel Drain Tube and Injector

The screw is also pivotal in securing the fuel drain tube and injector components. This ensures that fuel lines are properly sealed and that injectors are correctly positioned for optimal fuel delivery.

Instrument Panel Mounting

For instrument panel mounting, the 3013904 screw is used to secure gauges and controls, ensuring that they remain stable and readable under various operating conditions.

Long Block Assembly

In long block assemblies, the screw is utilized to fasten various components together, ensuring that the engine block, cylinder heads, and other parts are securely integrated.

Lubricating Oil Cooler Conversion Kit

The screw plays a role in securing the lubricating oil cooler conversion kit components, ensuring efficient oil cooling and maintaining optimal engine lubrication.

Magnetic Switch and Sea Water Transfer

For the magnetic switch and sea water transfer systems, the screw is used to secure these components, ensuring reliable operation and preventing leaks.

T-50 W/Brake Turbocharger and Throttle Lever

In the T-50 W/brake turbocharger and throttle lever applications, the screw is essential for securing turbocharger components and ensuring precise throttle control.

Tube, Flo-Scan MTG, and Turbocharger Kit

The screw is used in various tube assemblies, including the Flo-Scan MTG and turbocharger kit, to ensure that all components are securely fastened, promoting efficient airflow and performance.

Water Header Cover Mounting and Water Transfer Tube

Finally, in water header cover mounting and water transfer tube applications, the screw ensures that these components are securely attached, maintaining efficient coolant flow and engine temperature regulation.

Conclusion

The Cummins 3013904 Captive Washer Cap Screw is a critical component in the maintenance and operation of commercial trucks. Its robust design, high-strength materials, and corrosion-resistant coating make it ideal for various demanding applications. Proper installation and maintenance of this part ensure the reliability and efficiency of truck components, contributing to the overall performance and longevity of commercial vehicles.