3251706
Head Locking Screw
Cummins®

The Cummins 3251706 Head Locking Screw is a specialized fastener designed for use in heavy-duty truck engines. Its primary purpose is to secure the cylinder head to the engine block, ensuring a tight and reliable seal. This component plays a significant role in maintaining the integrity and performance of the engine by preventing leaks and ensuring proper compression within the cylinders ¹.

Function and Operation

The Cummins 3251706 operates by applying consistent and even pressure across the cylinder head gasket. This pressure is essential for creating a seal that prevents coolant and combustion gases from escaping. The screw is threaded into the engine block and tightened to specific torque specifications, which ensures that the cylinder head remains firmly in place under the varying pressures and temperatures experienced during engine operation ².

Key Features

The Cummins 3251706 is characterized by its robust design and high-quality material composition. It features a coarse thread type that allows for easy installation and removal while providing a strong grip. The screw is typically made from heat-treated alloy steel, which enhances its durability and resistance to corrosion. Additionally, the screw may include a unique locking mechanism to prevent loosening over time, ensuring consistent pressure on the cylinder head gasket ³.

Benefits

The use of the Cummins 3251706 offers several advantages. It contributes to improved engine reliability by ensuring a secure and leak-free seal between the cylinder head and engine block. This results in enhanced sealing capabilities, which are vital for maintaining engine efficiency and performance. Furthermore, the screw’s design helps to distribute pressure evenly across the gasket, reducing the risk of warping or damage to the cylinder head ⁴.

Installation and Maintenance

Proper installation of the Cummins 3251706 is critical for its effectiveness. It should be installed according to the manufacturer’s torque specifications to ensure the correct amount of pressure is applied without over-tightening, which could damage the gasket or threads. Regular maintenance checks are recommended to verify that the screws remain tight and have not loosened due to engine vibrations or thermal cycling. Any signs of leakage or uneven torque should be addressed promptly to prevent potential engine damage ⁵.

Troubleshooting Common Issues

Common issues associated with Head Locking Screws include leaks and loosening. If a leak is detected, it may indicate that the screw has loosened or that the gasket has failed. In such cases, the screw should be re-tightened to the specified torque, and the gasket may need to be replaced if damage is evident. Regular inspections and maintenance can help identify and address these issues before they lead to more significant problems ⁶.

Manufacturer Information

Cummins Inc. is a well-established company with a strong reputation in the automotive and heavy-duty truck industries. Founded in 1919, Cummins has a long history of producing high-quality engine components and systems. The company is known for its commitment to innovation, reliability, and customer satisfaction, making it a trusted name among professionals in the field ⁷.

Cummins Head Locking Screw 3251706 Compatibility

The Cummins Head Locking Screw part number 3251706 is a critical component designed to ensure the integrity and performance of various engine models. This screw is integral to the assembly and maintenance of the engine heads, providing a secure fastening mechanism that prevents loosening over time, which is crucial for maintaining engine efficiency and safety.

Compatible Engines

QSK19 Series:

• QSK19 CM2350: This engine benefits from the precision and reliability of the 3251706 screw, ensuring that the head remains securely fastened under high operational stresses.
• QSK19 CM500: The screw’s robust design is essential for maintaining the structural integrity of the engine head in this model, contributing to its overall performance and longevity.
• QSK19 CM850 MCRS: In this model, the 3251706 screw plays a pivotal role in securing the engine head, which is critical for the engine’s operation in demanding environments.

Other Models:

• K19: The 3251706 screw is compatible with the K19 engine, providing a reliable fastening solution that ensures the engine head remains securely in place.
• K114: This engine model also utilizes the 3251706 screw, which is essential for maintaining the head’s integrity and ensuring optimal engine performance.
• VTA903 CM2250 V105: The screw’s design is suitable for this engine, offering a dependable fastening mechanism that supports the engine’s operational demands.

The Cummins Head Locking Screw 3251706 is engineered to meet the stringent requirements of these engines, ensuring that the engine heads are securely fastened and remain in place under various operational conditions. This compatibility underscores the importance of using the correct components for engine maintenance and repair, ensuring that the engines operate efficiently and reliably.

Role of Part 3251706 Head Locking Screw in Engine Systems

The Part 3251706 Head Locking Screw is integral to the secure assembly and operation of various engine components. Its primary function is to ensure that components remain firmly in place, thereby contributing to the overall stability and efficiency of the engine system.

Integration with Damper and Vibration Components

In systems involving a damper, the Head Locking Screw plays a significant role in securing the damper to its mounting points. This is particularly important in vibration dampers, where the screw helps to maintain the damper’s position and effectiveness in reducing engine vibrations. By ensuring a tight fit, the screw aids in the consistent performance of the damper, which is essential for smooth engine operation.

Flywheel and Mounting Flywheel

When it comes to the flywheel, the Head Locking Screw is used to secure the flywheel to its mounting. This is vital for the flywheel’s function in storing rotational energy and smoothing out the power delivery from the engine. The screw’s role in this context is to provide a stable connection, allowing the flywheel to operate efficiently without any risk of displacement.

General Mounting Applications

In broader mounting applications, the Head Locking Screw is employed to secure various engine components to their respective mounts. This includes but is not limited to, the vibration damper mounting. The screw ensures that these components are held in place under the dynamic conditions of engine operation, contributing to the durability and reliability of the engine system.

Overall, the Part 3251706 Head Locking Screw is a key component in the secure assembly of engine systems, particularly in applications involving dampers, flywheels, and their mountings. Its reliable performance is essential for the efficient and stable operation of these components.

Conclusion

The Cummins 3251706 Head Locking Screw is a critical component in the maintenance and operation of heavy-duty truck engines. Its robust design, high-quality material, and precise function ensure that the cylinder head remains securely fastened, preventing leaks and maintaining engine efficiency. Proper installation, regular maintenance, and prompt troubleshooting of common issues are essential for the longevity and performance of this part. Cummins Inc.’s reputation for innovation and reliability further underscores the importance of using the correct components for engine maintenance and repair.