3040837
Captive Washer Cap Screw
Cummins®

Introduction To Captive Washer Cap Screws

A captive washer cap screw is a specialized fastener that integrates a screw and a washer into a single component. This design simplifies assembly by eliminating the need for a separate washer, thereby reducing the number of parts required. The screw typically features a head with a built-in washer, which provides a secure grip and evenly distributes the load, ensuring a reliable and efficient fastening solution ¹.

The Role Of The Cummins Part #3040837 Captive Washer Cap Screw In Engines

The Cummins Part #3040837 Captive Washer Cap Screw is integral to the assembly and operation of commercial truck engines. These screws secure various components, ensuring they remain tightly fastened and correctly aligned. Their design maintains structural integrity and prevents loosening over time, which is crucial for the performance and safety of heavy-duty trucks ².

How The Cummins Part #3040837 Captive Washer Cap Screw Works

The captive washer cap screw functions by threading into a tapped hole and compressing the built-in washer against the mating surface. This action creates a tight seal and evenly distributes the clamping force, preventing damage to the components being fastened. The screw’s head provides a secure point for applying torque, ensuring the connection remains firm under operational stresses.

Importance Of The Cummins Part #3040837 Captive Washer Cap Screw In Truck Operations

In commercial trucks, the captive washer cap screw is vital for maintaining the integrity of the engine and other critical systems. These screws are used in various applications, including securing engine blocks, cylinder heads, and other components. Their reliability and strength are essential for the longevity and performance of the vehicle ³.

Troubleshooting And Maintenance Tips

Proper maintenance of captive washer cap screws is crucial to ensure their longevity and effectiveness. Here are some troubleshooting and maintenance tips:

1. Regular Inspection: Periodically inspect the screws for signs of wear, corrosion, or damage. Look for cracks, deformation, or looseness that could indicate a problem.

2. Torque Specifications: Always use the correct torque specifications when installing or tightening the screws. Over-tightening can strip the threads or damage the washer, while under-tightening can lead to loosening and potential failure.

3. Cleaning: Keep the screws clean and free from debris, dirt, and corrosion. Use appropriate cleaning agents and protective coatings to prevent rust and ensure smooth operation.

4. Replacement: Replace any screws that show signs of wear or damage. Using worn or damaged screws can compromise the integrity of the assembly and lead to failures.

About Cummins

Cummins is a global power leader and a pioneer in the design and manufacture of engines, engine-related technology, and related parts. Known for its high-quality and reliable products, Cummins serves a wide range of industries, including commercial trucks, agriculture, and power generation. Their commitment to innovation and excellence makes them a trusted name in the industry.

Expertise And Authority

Understanding the critical role of components like the Cummins Part #3040837 Captive Washer Cap Screw is essential for the operation and maintenance of heavy-duty vehicles. With years of experience in the field, this article provides comprehensive and detailed information to help engineers, mechanics, truck drivers, and fleet operators make informed decisions about their vehicle’s maintenance and repair needs.

Captive Washer Cap Screw 3040837 in Cummins Engines

The Captive Washer Cap Screw 3040837, manufactured by Cummins, is a critical component in several of their engine models. This part is designed to secure various engine components, ensuring stability and reliability during operation. Here’s how it fits into different Cummins engine families:

K-Series Engines

• K19: The 3040837 is utilized in the K19 engine to fasten and secure specific parts, maintaining the structural integrity of the engine.
• K38: In the K38 engine, this cap screw is used to hold components in place, contributing to the engine’s overall durability.
• K50: The K50 engine also incorporates the 3040837 to ensure that critical parts remain tightly secured.

KTA Engines

• KTA19GC: The KTA19GC engine uses the 3040837 to fasten various engine parts, ensuring operational efficiency.
• KTA19GC CM558: This variant of the KTA19GC engine also relies on the 3040837 for securing components, maintaining the engine’s structural integrity.
• KTA38GC CM558: Similarly, the KTA38GC CM558 engine employs the 3040837 to keep parts firmly in place.

N-Series Engines

• N14 CELECT: The N14 CELECT engine utilizes the 3040837 to secure multiple components, ensuring the engine operates smoothly.
• N14 CELECT PLUS: This enhanced version of the N14 CELECT engine also uses the 3040837 for securing parts.
• N14 MECHANICAL: The N14 MECHANICAL engine incorporates the 3040837 to maintain the stability of its components.

NH/NT Series Engines

• NH/NT 855: The NH/NT 855 engine uses the 3040837 to secure various parts, ensuring the engine’s reliability and performance.

QSK Series Engines

• QSK19 CM2350 K114: The QSK19 CM2350 K114 engine employs the 3040837 to fasten components, contributing to the engine’s operational efficiency.
• QSK19 CM500: The QSK19 CM500 engine also uses the 3040837 for securing parts.
• QSK19 CM850 MCRS: The QSK19 CM850 MCRS engine incorporates the 3040837 to ensure components remain tightly secured.
• QSK19G: This variant of the QSK19 engine also utilizes the 3040837 for securing parts.
• QSK50 CM2150 MCRS: The QSK50 CM2150 MCRS engine uses the 3040837 to maintain the stability of its components.
• QSK50 CM2350 K108: The QSK50 CM2350 K108 engine also employs the 3040837 for securing parts.

QSN/QSNT Series Engines

• QSN14 CM876 N103: The QSN14 CM876 N103 engine uses the 3040837 to secure components, ensuring the engine’s reliability.
• QSNT14 CM876 N102: This variant of the QSN14 engine also utilizes the 3040837 for securing parts.

V-Series Engines

• V903: The V903 engine incorporates the 3040837 to secure various components, ensuring the engine’s stability.
• VTA903 CM2250 V105: The VTA903 CM2250 V105 engine uses the 3040837 to maintain the integrity of its components.

Role of Part 3040837 Captive Washer Cap Screw in Engine Systems

The Part 3040837 Captive Washer Cap Screw is instrumental in securing and maintaining the integrity of various engine components. Its application ensures that parts remain firmly in place, thereby enhancing the overall performance and reliability of the engine system.

Key Applications:

• Base Parts Less Rgt: The screw is used to secure base components, ensuring they are correctly positioned and do not shift during operation.

• Cooler Lubricating Oil Filter: It plays a role in attaching the cooler to the lubricating oil filter, maintaining a secure connection that is vital for efficient oil cooling.

• Crankcase Breather and Arrangement: The screw is employed in the crankcase breather system to keep the arrangement intact, allowing for proper ventilation and pressure regulation within the crankcase.

• Electronic Control Module Wiring Harness: Secures the wiring harness to the engine, ensuring that electrical connections remain stable and protected from vibrations.

• Filter/Cooler and Lub Oil Systems: Used in the assembly of filter/cooler units and lubricating oil systems to maintain secure connections and prevent leaks.

• Front Engine Guard: Helps in mounting the front engine guard, providing protection to internal components from external debris.

• Fuel Bypass Tube and Fuel Filter: Ensures the fuel bypass tube and fuel filter are correctly installed, maintaining the integrity of the fuel system.

• Fuel Plumbing and Tubing: Used in the fuel plumbing system to secure tubing, preventing fuel leaks and ensuring consistent fuel delivery.

• Guard Package and Hand Hole Cover: Secures guard packages and hand hole covers, offering protection and easy access for maintenance.

• Heat Exchanger Mounting: Plays a part in mounting heat exchangers, ensuring they are firmly attached for efficient heat transfer.

• Intake Manifold: Used in the assembly of the intake manifold, ensuring a secure fit that promotes optimal air intake.

• Lube Oil Cooler and Lubricating Oil Cooler Cover Mounting: Secures the lube oil cooler and its cover, maintaining efficient cooling of the lubricating oil.

• Lubricating Oil Filter Cooler: Ensures the lubricating oil filter cooler is correctly installed, contributing to the effective cooling of lubricating oil.

• Mounting Fuel Bypass Hose: Used to secure the fuel bypass hose, ensuring it remains in place and functions correctly.

• Oil Cooler and Oil Cooler Support (Rear) Mounting: Integral in mounting the oil cooler and its support, ensuring stable and efficient operation.

• Oil Pan Adapter and Oil Pan/Noise Panel Mtg.: Secures the oil pan adapter and noise panel, maintaining a sealed and quiet environment.

• Turbocharger Oil Supply Mounting: Ensures the turbocharger oil supply is correctly mounted, contributing to the efficient operation of the turbocharger.

• Water Discharge Plumbing: Used in the water discharge system to secure plumbing, ensuring proper water flow and cooling.

Conclusion

The Cummins Part #3040837 Captive Washer Cap Screw is a critical component in the assembly and maintenance of Cummins engines. Its role in securing various engine components ensures the structural integrity, performance, and reliability of heavy-duty trucks. Proper maintenance and adherence to torque specifications are essential to maximize the longevity and effectiveness of this Cummins part.