3936876
Rectangular Ring Seal
Cummins®

The Rectangular Ring Seal 3936876, manufactured by Cummins, is a specialized component designed for use in commercial trucks. This seal is integral to maintaining the integrity of various systems within these vehicles, ensuring efficient operation and reliability. Cummins, a well-established name in the commercial truck industry, produces this seal to meet the demanding requirements of heavy-duty applications ¹.

Basic Concepts of Rectangular Ring Seals

Rectangular ring seals are sealing elements characterized by their rectangular cross-section. They function by creating a barrier that prevents the leakage of fluids or gases between mating surfaces. These seals are commonly used in applications where a reliable seal is required under high pressure or in the presence of dynamic motion. Their design allows them to conform to irregularities in surface finishes, providing a consistent seal across a range of operating conditions ².

Role of the 3936876 Rectangular Ring Seal in Truck Operation

The 3936876 Rectangular Ring Seal plays a specific role in the operation of commercial trucks by ensuring the integrity of seals in various systems. It is typically placed in areas where fluid or gas containment is necessary, such as in hydraulic systems, fuel lines, or engine compartments. By maintaining a tight seal, it helps in preventing leaks, which can lead to system inefficiencies or failures. Its placement is crucial in areas exposed to high pressures or temperatures, where the seal’s performance is tested ³.

Key Features

The 3936876 Rectangular Ring Seal is distinguished by several key features that enhance its performance. It is composed of materials selected for their durability and resistance to the operating conditions found in commercial trucks. The design of the seal includes precise dimensions and a rectangular cross-section that allows it to adapt to the surfaces it seals against. Additionally, any unique characteristics, such as reinforced edges or specific material treatments, contribute to its effectiveness in demanding environments.

Benefits

The benefits provided by the 3936876 Rectangular Ring Seal include improved sealing efficiency, which leads to better system performance and reliability. Its durability ensures a longer service life, reducing the need for frequent replacements. The seal’s resistance to various operating conditions, including high temperatures and pressures, makes it suitable for the rigorous demands of commercial truck applications. These attributes contribute to the overall efficiency and longevity of the truck’s systems ⁴.

Troubleshooting and Maintenance

Common issues associated with rectangular ring seals may include leaks due to wear, improper installation, or exposure to incompatible fluids. Troubleshooting these issues involves inspecting the seal for signs of damage or wear, ensuring it is correctly installed, and verifying compatibility with the system’s fluids. Maintenance practices to ensure the longevity and effectiveness of the seal include regular inspections, proper installation procedures, and replacement according to the manufacturer’s guidelines or when signs of wear are detected.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration systems, and related technologies. With a history spanning over a century, Cummins has established a reputation for quality, innovation, and reliability in the commercial truck industry. Its product range includes engines, powertrains, and aftermarket parts, all designed to meet the needs of heavy-duty applications. Cummins’ commitment to excellence is reflected in its products, which are trusted by professionals worldwide for their performance and durability.

Cummins Rectangular Ring Seal 3936876 Compatibility

The Cummins Rectangular Ring Seal part number 3936876 is designed to fit a variety of Cummins engines. This seal is essential for maintaining the integrity of the engine’s sealing system, ensuring that there are no leaks and that the engine operates efficiently.

Compatible Engines

• 15N CM2380 M104B
• 4B3.9
• 6B5.9
• 6C8.3
• B3.9 G
• B4.5
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7S
• C GAS PLUS CM556
• C8.3 G
• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISB5.9G CM2180
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118
• ISBE CM2150
• ISBE4 CM850
• ISC CM2150

Grouping of Compatible Engines

Group 1: Smaller Displacement Engines

• 4B3.9
• 6B5.9
• B3.9 G
• B4.5
• ISB CM2150
• ISB CM550
• ISB3.9 CM2220 B107
• ISBE CM2150

Group 2: Medium Displacement Engines

• 6C8.3
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7S
• C GAS PLUS CM556
• C8.3 G
• ISB5.9 CM2880 B127
• ISB5.9G CM2180
• ISB6.7 CM2250
• ISB6.7 G CM2180 B118
• ISBE4 CM850

Group 3: Larger Displacement Engines

• 15N CM2380 M104B
• ISB CM850
• ISB/ISD6.7 CM2150 SN
• ISB6.7 CM2350 B101
• ISC CM2150

This grouping helps in understanding the range of engines that the Cummins Rectangular Ring Seal 3936876 can be used with, making it easier for technicians and fleet managers to ensure they have the correct parts for their specific engine models.

Role of Part 3936876 Rectangular Ring Seal in Engine Systems

The Rectangular Ring Seal, part 3936876, is an essential component in various engine systems, ensuring the integrity and efficiency of several critical assemblies. Its application spans across multiple engine components, contributing to the overall performance and reliability of the engine.

Valve Cover and Breather System

In the valve cover arrangement, the Rectangular Ring Seal is utilized to create a secure seal between the valve cover and the cylinder block. This seal is vital for maintaining the pressure within the crankcase and preventing oil leaks. Additionally, it interfaces with the breather system, including the breather and breather kit, to ensure that the crankcase ventilation is efficient and free from contaminants.

Oil Fill and Reducing Adapter

The seal is also employed in the oil fill arrangement, where it ensures a tight connection between the oil filler connection and the cylinder block. This is particularly important when using a reducing adapter, as it prevents oil from escaping during the filling process, thus maintaining the proper lubrication levels within the engine.

Overhaul and Rebuild Kits

During engine overhaul or rebuild processes, the Rectangular Ring Seal is a component found in both lower and upper engine gasket kits. It plays a role in sealing the connections between various engine components, such as the hand hole cover and the flywheel housing. This ensures that the engine maintains its structural integrity and operational efficiency post-overhaul.

Pistonless Overhaul and PDC Kit

In scenarios involving a pistonless overhaul or when utilizing a PDC (Precision Deck Component) kit, the seal is crucial for maintaining the seal between the cylinder block and other mating surfaces. This is important for preserving the engine’s compression and preventing any oil leakage that could compromise the overhaul’s success.

Engine Installation and Cylinder Block

During engine installation, the Rectangular Ring Seal is used to ensure a proper seal between the cylinder block and adjacent components, such as the valve and filler cap. This is essential for the initial setup and long-term reliability of the engine, as it prevents oil leaks and maintains the necessary pressure within the engine compartments.

Comprehensive Gasket Sets

The seal is also a component in comprehensive gasket sets, including the upper engine gasket stud set and the lower engine gasket set. These sets are designed to provide a complete sealing solution for the engine, ensuring that all critical junctions are sealed effectively to prevent oil leaks and maintain engine performance.

Conclusion

In summary, the Rectangular Ring Seal, part 3936876, is a versatile component that enhances the functionality and reliability of various engine systems. Its application across different engine components underscores its importance in maintaining the engine’s operational integrity.