3949326
Ring Dowel
Cummins®

The Cummins 3949326 Ring Dowel Pin is a specialized component designed for use in heavy-duty truck engines. Its purpose is to ensure precise alignment and secure positioning of various engine components, contributing to the overall efficiency and reliability of the engine. Understanding the role and significance of this part is vital for maintaining and optimizing the performance of heavy-duty trucks.

Basic Concepts of Ring Dowel Pins

A Ring Dowel Pin is a cylindrical fastener used in mechanical assemblies to align and position components accurately. In engines and other machinery, these pins help maintain the correct spacing and orientation of parts, ensuring that they function as intended. They are typically made from durable materials to withstand the stresses and vibrations encountered in operation ¹.

Purpose of the 3949326 Ring Dowel Pin

The 3949326 Ring Dowel Pin plays a specific role in the operation of a truck by ensuring the proper alignment of engine components. It is designed to fit into corresponding holes in the engine block and other parts, securing them in place and preventing movement that could lead to wear or failure. This precise alignment is crucial for the efficient operation of the engine, contributing to its longevity and performance ².

Key Features

The 3949326 Ring Dowel Pin is characterized by several key features that enhance its performance. It is typically made from high-strength steel, providing durability and resistance to wear. The design includes a precise diameter and length to ensure a snug fit in the designated holes, and the surface may be treated to improve corrosion resistance and reduce friction ³.

Benefits

Using the 3949326 Ring Dowel Pin offers several benefits. It improves the alignment of engine components, which can lead to enhanced durability and reduced wear. Additionally, proper alignment contributes to overall engine efficiency, ensuring that the engine operates smoothly and reliably. The durable construction of the pin also means it can withstand the demanding conditions of heavy-duty truck use.

Installation Process

Installing the 3949326 Ring Dowel Pin requires careful attention to ensure correct placement and function. The process involves cleaning the mating surfaces to remove any debris or old lubricants, inserting the pin into the designated hole, and verifying that it is seated properly. Tools such as a pin punch may be used to ensure the pin is fully inserted and secure. It is important to follow manufacturer guidelines to avoid damage to the pin or surrounding components.

Troubleshooting Common Issues

Common issues with the 3949326 Ring Dowel Pin may include misalignment or wear. Misalignment can often be corrected by re-inserting the pin and ensuring it is properly seated. Wear may require replacement of the pin to maintain optimal performance. Regular inspection during maintenance intervals can help identify these issues early, allowing for timely correction.

Maintenance Tips

To ensure the longevity and optimal performance of the 3949326 Ring Dowel Pin, regular maintenance is recommended. This includes periodic inspection for signs of wear or damage, cleaning the pin and mating surfaces to remove any buildup, and verifying that it remains properly seated. Following these maintenance tips can help prevent issues and ensure the pin continues to function effectively.

Role in Engine Assembly

The 3949326 Ring Dowel Pin integrates into the broader engine assembly by providing precise alignment and secure positioning of components. Its interaction with other parts ensures that the engine operates within specified tolerances, contributing to the engine’s overall function and efficiency. Proper installation and maintenance of the pin are crucial for the reliable performance of the engine.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and a reputation for quality, Cummins serves a wide range of industries, including heavy-duty trucking. The company’s commitment to excellence is reflected in its product range, which includes high-quality components like the 3949326 Ring Dowel Pin, designed to meet the demanding requirements of heavy-duty applications.

Ring Dowel Pin 3949326 Compatibility with Cummins Engines

The Ring Dowel Pin 3949326, manufactured by Cummins, is a critical component that fits into various Cummins engine models. This pin is essential for maintaining the alignment and stability of the piston rings, ensuring optimal engine performance and longevity. Below is a detailed overview of the engines with which this part is compatible:

Compatible Engines

• 15N CM2380 M104B
• B4.5 CM2350 B129B
• B4.5 RGT
• B5.6 CM2670 B152B
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125
• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB4.5 CM2350 B104
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118
• ISBE CM2150
• ISBE4 CM850
• ISD4.5 CM2220 D108
• ISF2.8 CM2220 F129
• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103
• ISG11 CM2880 G108
• ISG12 CM2880 G107

Grouping of Compatible Engines

Group 1: B Series Engines

• B4.5 CM2350 B129B
• B4.5 RGT
• B5.6 CM2670 B152B

Group 2: B6.7 Series Engines

• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

Group 3: ISB Series Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB4.5 CM2350 B104
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

Group 4: ISBE Series Engines

• ISBE CM2150
• ISBE4 CM850

Group 5: ISD Series Engines

• ISD4.5 CM2220 D108

Group 6: ISF Series Engines

• ISF2.8 CM2220 F129
• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103

Group 7: ISG Series Engines

• ISG11 CM2880 G108
• ISG12 CM2880 G107

This detailed compatibility information ensures that technicians and engine users can confidently select the Ring Dowel Pin 3949326 for their specific Cummins engine models.

Role of Part 3949326 Ring Dowel Pin in Engine Systems

The Part 3949326 Ring Dowel Pin is instrumental in ensuring precise alignment and secure fitting of various components within engine systems. Its application spans across multiple assemblies, contributing to the overall integrity and performance of the engine.

Key Applications:

• Cylinder Block and Cylinder Block Kit: The Ring Dowel Pin is used to align the cylinder block with other components, ensuring that the block is correctly positioned during assembly. This alignment is vital for the proper functioning of the pistons and cylinders.

• Cylinder Block Hardware Kit and Cylinder Block Stiffener: These kits often include the Ring Dowel Pin to maintain the structural rigidity of the cylinder block. Proper alignment facilitated by the pin prevents undue stress on the block, enhancing durability.

• Front Cylinder Block Cover and Front Gear Cover: The pin ensures that these covers are accurately aligned with the cylinder block, which is essential for sealing and protecting internal components from contaminants.

• Front Sprocket Cover: Accurate alignment of the front sprocket cover is crucial for the timing and operation of the engine’s sprocket and chain system. The Ring Dowel Pin plays a role in maintaining this alignment.

• Gear Cover Kit: Within the gear cover kit, the pin helps in the precise mounting of the gear cover, which houses critical gear components necessary for engine operation.

• Rear Gear Train Accessory Drive: This complex assembly requires exact alignment to function correctly. The Ring Dowel Pin assists in achieving this alignment, ensuring smooth operation of the accessory drive.

• Flywheel Housing: The pin is used to align the flywheel housing with the engine block, which is important for the proper engagement of the flywheel with the crankshaft.

• Lubricating Oil Pump and Lubricating Oil Cooler Module: These components rely on accurate positioning to ensure efficient oil flow and cooling. The Ring Dowel Pin aids in the correct installation of these parts.

• Multiple Function Lubrication Housing: This housing often incorporates several lubrication pathways. The pin ensures that the housing is correctly aligned, facilitating optimal lubrication distribution.

• Oil Pan: Proper alignment of the oil pan is essential for effective oil collection and circulation. The Ring Dowel Pin helps in securing the pan in the correct position.

• Short Block and Short Block Kit: These assemblies include the cylinder block, crankshaft, and other essential components. The pin ensures that all parts are aligned correctly, contributing to the overall performance of the short block.

• Long Block and Long Block Kit: Similar to the short block, the long block includes additional components like the cylinder head. The Ring Dowel Pin is used to ensure that all elements are precisely aligned.

• Accessory Drive and Air Intake Connection: These components require accurate positioning to function efficiently. The pin aids in the correct alignment of these parts with the engine block.

• Fuel Drain Plumbing: Proper alignment of the fuel drain system is important for safe and efficient fuel management. The Ring Dowel Pin ensures that the plumbing is correctly installed.

In summary, the Part 3949326 Ring Dowel Pin is a fundamental component in the assembly and maintenance of various engine systems, ensuring that all parts are aligned and secured correctly for optimal engine performance.

Conclusion

The Cummins 3949326 Ring Dowel Pin is a critical component in the assembly and maintenance of heavy-duty truck engines. Its role in ensuring precise alignment and secure positioning of engine components contributes significantly to the engine’s efficiency, reliability, and longevity. Proper installation, regular maintenance, and timely troubleshooting of common issues are essential for maximizing the performance and lifespan of this part. Understanding the key features, benefits, and applications of the 3949326 Ring Dowel Pin enables technicians and engine users to maintain and optimize the performance of Cummins engines effectively.