4976251
Oil Piston Ring
Cummins®

Introduction

The Cummins 4976251 Oil Piston Ring is a component designed for heavy-duty truck engines. It contributes to the efficient performance of these engines by managing oil consumption and maintaining engine efficiency. Understanding its role and functionality is key to appreciating its significance in the broader context of engine operation.

Basic Concepts of Oil Piston Rings

Oil piston rings are components found in internal combustion engines. Their general function is to control the amount of oil that reaches the cylinder walls, ensuring that the engine operates smoothly and efficiently. These rings interact with other engine components by forming a seal that prevents excessive oil from entering the combustion chamber while allowing enough lubrication to the cylinder walls ¹.

Purpose of the Cummins 4976251 Oil Piston Ring

This Cummins part plays a specific role in the operation of a truck engine. It is designed to control oil consumption, ensuring that the right amount of oil is used for lubrication without allowing excess oil to enter the combustion chamber. This balance is crucial for maintaining engine efficiency and reducing wear on engine components ².

Key Features

The Cummins 4976251 Oil Piston Ring is characterized by several unique features that enhance its performance and durability. These include its material composition, which is engineered to withstand high temperatures and pressures, the ring gap, which allows for proper expansion and contraction, and the tension, which ensures a tight seal against the cylinder wall ³.

Benefits

Using this Cummins part offers several advantages. These include improved engine efficiency through better oil management, reduced oil consumption, which leads to cost savings and less frequent oil changes, and enhanced overall engine performance due to optimal lubrication and reduced wear ⁴.

Installation Process

Proper installation of the Cummins 4976251 Oil Piston Ring involves several steps. It is important to follow best practices to ensure the ring functions correctly. This includes cleaning the cylinder bore before installation, ensuring the ring is properly seated, and checking for proper gap alignment. Common pitfalls to avoid include over-tightening the ring and not aligning the gap correctly ⁵.

Troubleshooting Common Issues

Typical problems associated with oil piston rings can include excessive oil consumption or engine knocking. These issues may arise from improper installation, wear and tear, or contamination. Diagnostic approaches involve inspecting the ring for wear, checking the cylinder bore for damage, and ensuring proper installation. Repair may involve replacing the ring or addressing issues with the cylinder bore ⁶.

Maintenance Tips

Regular maintenance practices are important for ensuring the longevity and optimal performance of the Cummins 4976251 Oil Piston Ring. This includes inspecting the ring during routine engine maintenance, cleaning the cylinder bore to remove any contaminants, and replacing the ring if signs of wear or damage are detected ⁷.

Cummins Corporation Overview

Cummins Inc. is a well-established company in the heavy-duty truck industry, known for its wide range of products and strong reputation for quality and reliability. The company’s history of innovation and commitment to excellence provides context for the quality and reliability of the Cummins 4976251 Oil Piston Ring ⁸.

Compatibility

The Cummins Oil Piston Ring part number 4976251 is designed to be compatible with a range of engines, ensuring optimal performance and longevity. Here is a detailed overview of its compatibility with the specified engines:

• F2.8 CM2620 F135B, ISF2.8 CM2220 F117, ISF2.8 CM2220 F129, ISV (Nissan)

  The Oil Piston Ring 4976251 fits seamlessly with the F2.8 CM2620 F135B engine, as well as the ISF2.8 CM2220 F117 and ISF2.8 CM2220 F129 engines. This part is engineered to meet the specific requirements of these engines, ensuring efficient oil control and reduced wear.

• QSF2.8 CM2880 F104, QSF2.8 CM2880 F105, QSF2.8 CM2880 F114

  The ring is also compatible with the QSF2.8 CM2880 F104, QSF2.8 CM2880 F105, and QSF2.8 CM2880 F114 engines. These engines benefit from the precise fit and high-quality construction of the 4976251 Oil Piston Ring, which helps maintain engine efficiency and performance.

• R2.8 CM2220 R101B

  Lastly, the Cummins Oil Piston Ring 4976251 is suitable for the R2.8 CM2220 R101B engine. This part is crafted to provide a reliable seal, minimizing oil consumption and enhancing the engine’s operational lifespan.

Understanding the Role of Part 4976251 Oil Piston Ring in Engine Systems

This part is an essential component in the efficient operation of various engine systems. It works in conjunction with several other components to ensure optimal performance and longevity of the engine.

Interaction with the Piston Assembly

The oil piston ring is a key element within the piston assembly. It sits within the grooves of the piston and plays a significant role in sealing the combustion chamber. This sealing action helps maintain compression and prevents oil from entering the combustion area, which is vital for the engine’s performance ⁹.

Relationship with the Engine Piston and Piston Ring Kit

When integrated into the engine piston, the oil piston ring operates as part of the piston ring kit. This kit typically includes compression rings and oil control rings. The oil piston ring, specifically, manages oil flow between the cylinder wall and the piston, ensuring that the right amount of lubrication is maintained without excess oil entering the combustion chamber ¹⁰.

Contribution to the Power Cylinder Kit

In the context of a power cylinder kit, the oil piston ring contributes to the overall efficiency and durability of the cylinder. By effectively controlling oil consumption, it helps maintain the cylinder’s surface, reducing wear and tear. This, in turn, enhances the engine’s power output and reliability over time ¹¹.

Coordination with the Connecting Rod and Piston

The connecting rod and piston work together to convert the linear motion of the piston into rotational motion of the crankshaft. The oil piston ring ensures that the piston operates smoothly within the cylinder by providing adequate lubrication and reducing friction. This smooth operation is essential for the durability and performance of the connecting rod and piston assembly ¹².

Impact on Engine Performance

The performance of the engine is directly influenced by the efficiency of the oil piston ring. By maintaining proper lubrication and compression, it helps the engine run more efficiently, with reduced emissions and improved fuel economy. The ring’s role in oil management also contributes to the overall reliability and longevity of the engine ¹³.

Integration with Other Engine Components

While the primary function of the oil piston ring is within the piston and cylinder assembly, its effectiveness impacts other engine components such as the camshaft and injector. Proper lubrication and compression lead to smoother engine operation, which is beneficial for the camshaft’s timing and the injector’s fuel delivery precision ¹⁴.

Conclusion

The Cummins 4976251 Oil Piston Ring is a vital component that interacts with various engine systems to ensure efficient and reliable operation. Its role in maintaining compression, controlling oil flow, and reducing friction is fundamental to the engine’s performance and durability.