3900720
Dowell,ring
Cummins®

Introduction

The Cummins 3900720 Dowel Ring is a component designed for use in heavy-duty truck operations. Its primary role is to ensure proper alignment and stability between mating components within the engine or transmission system. By maintaining precise alignment, this Cummins part contributes to the efficient and reliable operation of the truck ¹.

Basic Concepts of Dowel Rings

A dowel ring is a cylindrical component used in mechanical assemblies to align and secure two or more parts together. It plays a role in maintaining the correct positional relationship between components, which is vital for the overall stability and performance of the assembly. Dowel rings are commonly made from durable materials to withstand the stresses and loads encountered in heavy-duty applications ².

Purpose of the 3900720 Dowel Ring

The Cummins 3900720 Dowel Ring is specifically designed to facilitate the alignment and secure fitting of components within the engine or transmission system of heavy-duty trucks. It ensures that parts are correctly positioned relative to each other, which is important for the smooth operation and longevity of the mechanical system. This dowel ring helps in reducing the likelihood of misalignment, which can lead to increased wear and potential failure of components ³.

Key Features

The Cummins 3900720 Dowel Ring is characterized by several key features that enhance its performance and durability. These include a precise design that ensures accurate alignment, a material composition that provides strength and resistance to wear, and unique attributes such as surface treatments that may be applied to improve its functionality in demanding environments.

Benefits

Using the Cummins 3900720 Dowel Ring offers several benefits. It contributes to improved alignment of components, which can reduce wear on mating parts and enhance the overall reliability of the truck’s mechanical systems. Additionally, the dowel ring helps in maintaining the integrity of the assembly under operational stresses, leading to more consistent performance over time.

Installation Process

Proper installation of the Cummins 3900720 Dowel Ring is important for its effective function. The process involves ensuring that the dowel ring is correctly positioned within the designated bore or hole. Tools such as alignment jigs may be used to facilitate accurate placement. It is also important to follow best practices to ensure that the dowel ring is securely in place and functions as intended.

Troubleshooting and Maintenance

Identifying common issues with the Cummins 3900720 Dowel Ring, such as misalignment or wear, is important for maintaining the performance of the truck. Regular inspections can help in detecting these issues early. Maintenance practices may include cleaning the dowel ring and its mating surfaces, as well as ensuring that it remains properly seated and aligned.

Common Failure Modes

Dowel rings, including the Cummins 3900720, can experience failure due to various causes such as improper installation, material fatigue, or excessive stress. Understanding these failure modes can help in taking preventive measures, such as ensuring correct installation procedures are followed and monitoring the condition of the dowel ring during routine maintenance checks.

Replacement Guidelines

Replacing the Cummins 3900720 Dowel Ring should be considered when signs of wear or damage are observed. These may include visible cracks, deformation, or significant wear that could compromise its function. Using genuine Cummins parts for replacement is recommended to ensure compatibility and maintain the performance standards of the truck’s mechanical systems.

Cummins Overview

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 heavy-duty truck industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s product range includes a variety of components and systems designed to meet the demanding requirements of heavy-duty applications.

Dowel Ring 3900720 Compatibility with Cummins Engines

The Dowel Ring 3900720, manufactured by Cummins, is a critical component that ensures proper alignment and stability in various engine configurations. This part is designed to fit seamlessly with a range of Cummins engines, providing essential support and precision in engine assembly.

B6.7 and ISB6.7 Engines

The Dowel Ring 3900720 is compatible with the B6.7 CM2350 and ISB6.7 G CM2180 engines. These engines are known for their robust performance and reliability, often used in heavy-duty applications. The dowel ring ensures that the engine components are correctly aligned, enhancing the overall efficiency and longevity of the engine.

F2.8 and ISF2.8 Engines

This dowel ring also fits the F2.8 CM2620 and ISF2.8 CM2220 engines. These engines are designed for high-performance applications, and the dowel ring plays a crucial role in maintaining the precision required for optimal operation. The compatibility with both F2.8 and ISF2.8 models ensures that the part can be used across different variants of these engines.

G11 and G108 Series Engines

The Dowel Ring 3900720 is suitable for the ISG11 CM2880 G108 and ISG12 CM2880 G107 engines. These engines are part of the G11 and G108 series, which are known for their versatility and adaptability in various industrial applications. The dowel ring ensures that the engine components remain aligned, contributing to the smooth operation of these engines.

G111 and G112 Series Engines

This dowel ring is also compatible with the ISG12 G CMOH6.0 G111 and QSG12 CM2880 G112 engines. These engines are part of the G111 and G112 series, which are designed for high-performance and durability. The dowel ring’s role in maintaining alignment is critical for the efficient functioning of these engines.

X102 and X12 Series Engines

The Dowel Ring 3900720 fits the ISX12 CM2350 X102 and QSG12/X12 CM2350 G110 engines. These engines are part of the X102 and X12 series, known for their power and reliability in demanding applications. The dowel ring ensures that the engine components are correctly aligned, contributing to the overall performance and longevity of these engines.

Z101 and Z105 Series Engines

This dowel ring is also compatible with the ISZ13 CM2150 Z105 and QSZ13 CM2150 Z101 engines. These engines are part of the Z101 and Z105 series, which are designed for specific industrial applications. The dowel ring ensures that the engine components are properly aligned, enhancing the efficiency and reliability of these engines.

QSB Series Engines

The Dowel Ring 3900720 is suitable for the QSB4.5 CM2250 EC, QSB4.5 CM850 (CM2850), and QSB5.9 CM550 engines. These engines are part of the QSB series, known for their versatility and performance in various applications. The dowel ring ensures that the engine components are correctly aligned, contributing to the smooth operation of these engines.

QSF Series Engines

This dowel ring fits the QSF2.8 CM2880 F104, QSF2.8 CM2880 F105, QSF2.8 CM2880 F108, and QSF2.8 CM2880 F114 engines. These engines are part of the QSF series, which are designed for specific industrial applications. The dowel ring ensures that the engine components are properly aligned, enhancing the efficiency and reliability of these engines.

QSX Series Engines

The Dowel Ring 3900720 is compatible with the QSX11.9 CM2250 ECF engine. This engine is part of the QSX series, known for its power and reliability in demanding applications. The dowel ring ensures that the engine components are correctly aligned, contributing to the overall performance and longevity of this engine.

Role of Part 3900720 Dowel Ring in Engine Systems

The Part 3900720 Dowel Ring is an essential component in ensuring the precise alignment and secure fitting of various engine components. Its role is significant in maintaining the structural integrity and operational efficiency of the engine system.

Accessory Drive and Related Components

In the accessory drive system, the Dowel Ring ensures that components such as the accessory drive kit, accessory support, and alternator bracket are correctly aligned. This alignment is vital for the smooth operation of accessories like the alternator and air compressor. The Dowel Ring facilitates the proper mounting of the alternator and air compressor, ensuring that these components are securely held in place and function efficiently.

Air Compressor and Support Structures

For the air compressor and its mounting system, the Dowel Ring plays a key role in the air compressor mounting and air compressor support. It ensures that the air compressor is aligned correctly with the engine, allowing for efficient compression and delivery of air. This is particularly important in systems where the air compressor is integral to the engine’s performance, such as in turbocharged engines.

Balancer and Flywheel Housing

In the balancer housing and flywheel housing, the Dowel Ring is used to maintain the alignment of the balancer and engine components. This is essential for reducing vibrations and ensuring smooth engine operation. The Dowel Ring helps in securing the balancer in place, which is critical for the overall balance and stability of the engine.

Camshaft and Cylinder Block

For the camshaft and cylinder block, the Dowel Ring ensures that the camshaft bearing cap is aligned correctly with the cylinder block. This alignment is essential for the proper functioning of the camshaft, which in turn affects the timing and efficiency of the engine’s valve operation.

Front and Rear Components

In the front cover and front engine support, the Dowel Ring ensures that these components are aligned correctly with the engine. This is important for the structural integrity of the engine’s front section. Similarly, in the rear gear train accessory drive and rocker lever housing, the Dowel Ring facilitates the correct alignment and secure fitting of these components, ensuring efficient power transmission and operation.

Idler Shaft and Power Take-Off Housing

The Dowel Ring also plays a role in the idler shaft and power take-off housing. It ensures that these components are aligned and secured correctly, which is essential for the efficient transfer of power within the engine system. This is particularly important in systems where the power take-off is used for additional functions, such as driving auxiliary equipment.

Lifting Bracket Mounting

Finally, in the lifting bracket mounting, the Dowel Ring ensures that the lifting points on the engine are aligned correctly. This is important for safe and efficient engine handling and transportation.

Conclusion

In summary, the Part 3900720 Dowel Ring is a key component in ensuring the correct alignment and secure fitting of various engine components, contributing to the overall efficiency and reliability of the engine system.