207386
Head Locking Screw
Cummins®

Introduction

The Cummins 207386 Head Locking Screw is a specialized fastener designed for use in heavy-duty truck engines. Its primary role is to secure the cylinder head to the engine block, ensuring a proper seal and alignment. This component is integral to maintaining the structural integrity and operational efficiency of the engine ¹.

Purpose and Function

The Cummins 207386 Head Locking Screw secures the cylinder head to the engine block, which is vital for maintaining the proper sealing of the combustion chamber and ensuring that the cylinder head remains correctly aligned with the engine block. Proper sealing prevents coolant and oil leaks, while correct alignment ensures efficient combustion and reduces the risk of engine damage ².

Design and Construction

This Cummins part is constructed from high-strength materials to withstand the extreme conditions within a heavy-duty engine. It features a specific thread type designed to provide a secure fit within the engine block and cylinder head. The screw may also include special coatings or treatments to enhance corrosion resistance and reduce the risk of galling during installation and removal ³.

Installation Process

Installing the Cummins 207386 Head Locking Screw requires adherence to a precise procedure to ensure proper function and durability. The installation process includes cleaning the threads in the engine block and cylinder head, applying the appropriate thread sealant, and using a torque wrench to tighten the screw to the manufacturer’s specified torque. The sequence of tightening is also critical to ensure even pressure distribution across the cylinder head gasket ⁴.

Benefits

The use of the Cummins 207386 Head Locking Screw offers several advantages. It contributes to enhanced engine performance by ensuring a secure and leak-free seal between the cylinder head and engine block. This component also plays a role in increasing the reliability and longevity of the engine by preventing misalignment and reducing the risk of leaks ¹.

Common Issues and Troubleshooting

Typical problems associated with the Cummins 207386 Head Locking Screw include over-tightening, which can lead to thread damage, and under-tightening, which may result in leaks. Troubleshooting steps involve inspecting the screw and threads for damage, ensuring the correct torque is applied during installation, and replacing any damaged components as necessary ².

Maintenance Tips

To ensure optimal performance and longevity of the Cummins 207386 Head Locking Screw, regular inspection and maintenance are recommended. This includes checking for signs of wear or damage, ensuring the screw is properly torqued, and replacing the screw if it shows signs of corrosion or if the engine has undergone significant overhaul ³.

Manufacturer - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including diesel and natural gas engines, as well as related technologies. With a strong reputation in the automotive industry, particularly in the realm of heavy-duty truck engines, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and technical expertise make it a trusted name in the industry ⁴.

Cummins Head Locking Screw 207386 Compatibility

The Cummins Head Locking Screw part number 207386 is designed to fit a range of Cummins engines, ensuring secure fastening of the cylinder head to the engine block. Below is a detailed overview of the compatibility of this part with various Cummins engine models:

K19 Series

• K19
• KTA19GC
• KTA19GC CM558

These engines are part of the K19 series, which are known for their robust design and reliability in various industrial applications. The Head Locking Screw 207386 is engineered to provide the necessary strength and durability for these engines.

QSK19 Series

• QSK19 CM2350 K105
• QSK19 CM2350 K114
• QSK19 CM2350 K144G
• QSK19 CM500
• QSK19 CM850 MCRS
• QSK19G

The QSK19 series engines are designed for demanding applications, providing high power output and efficiency. The Head Locking Screw 207386 is compatible with these engines, ensuring that the cylinder head remains securely fastened under high stress conditions.

NH/NT Series

• NH/NT 855

The NH/NT 855 engine is another model that benefits from the use of the Cummins Head Locking Screw 207386. This part is essential for maintaining the integrity of the engine’s cylinder head assembly, ensuring optimal performance and longevity.

By using the Cummins Head Locking Screw 207386, technicians and engineers can ensure that the cylinder heads on these engines are properly secured, contributing to the overall reliability and efficiency of the engine.

Role of Part 207386 Head Locking Screw in Engine Systems

The Cummins 207386 Head Locking Screw is instrumental in ensuring the secure assembly and operation of various engine components. Its primary function is to maintain the integrity of connections between critical parts, thereby contributing to the overall stability and performance of the engine.

Integration with Key Components

1. Crankshaft: The Head Locking Screw plays a significant role in securing the crankshaft to the engine block. This connection is vital for transmitting rotational force from the pistons to the transmission system.

2. Damper Mounting: When it comes to the vibration damper, the Head Locking Screw ensures that the damper is firmly attached to the crankshaft. This is essential for absorbing vibrations and reducing wear on the crankshaft and other connected components.

3. Flywheel: The screw is used to secure the flywheel to the crankshaft. This connection is fundamental for storing rotational energy and smoothing out the power delivery to the transmission.

4. Flywheel and Ring Gear: In systems where the flywheel is integrated with a ring gear, the Head Locking Screw ensures that both components are securely fastened to the crankshaft. This is important for the starter motor to engage properly and for the consistent operation of the engine.

5. Flywheel Housing: Although the primary connection is between the flywheel and the crankshaft, the Head Locking Screw indirectly affects the flywheel housing by ensuring that the flywheel is correctly positioned and secured.

6. Flywheel Mounting: The screw is also involved in the overall flywheel mounting process, contributing to the secure attachment of the flywheel assembly to the engine.

7. Mounting Flywheel and Ring Gear: In configurations where the flywheel and ring gear are mounted together, the Head Locking Screw ensures a robust connection, which is essential for the reliable operation of the engine’s starting system.

8. Mounting: Generically, the Head Locking Screw is used in various mounting applications throughout the engine, ensuring that components are held in place under operational stresses.

9. Flywheel: Reiterating its importance, the screw’s role in securing the flywheel cannot be overstated, as it directly impacts the engine’s ability to maintain consistent rotational speed.

10. Vibration Damper: The secure attachment of the vibration damper to the crankshaft, facilitated by the Head Locking Screw, is crucial for minimizing engine vibrations and prolonging the lifespan of engine components.

Conclusion

The Cummins 207386 Head Locking Screw is a critical component in the assembly and operational integrity of various engine systems. It ensures that critical connections remain secure under the dynamic conditions of engine operation, contributing to the overall stability, performance, and longevity of the engine.