3999820
Breather Gasket
Cummins®

The Cummins Breather Gasket 3999820 is a critical component for commercial trucks, integral to the engine’s ventilation system. This gasket allows for the controlled release of gases and moisture from the engine crankcase, essential for maintaining engine health and operational efficiency. Understanding its function, importance, and integration within the truck’s system is crucial for optimal engine performance and longevity.

Basic Concepts of Breather Gaskets

Breather gaskets serve a fundamental role in engine systems by allowing the controlled release of gases and moisture from the crankcase while preventing the ingress of contaminants. This process is vital for maintaining engine health, as it prevents the buildup of pressure and the accumulation of harmful substances within the crankcase, which can lead to engine wear and reduced efficiency ¹.

Purpose of the Cummins Breather Gasket 3999820

The Cummins Breather Gasket 3999820 is engineered to facilitate the regulated release of gases and moisture from the crankcase in commercial truck engines. By ensuring the crankcase remains free from excessive pressure and contaminants, this gasket contributes to the engine’s overall efficiency and durability ².

Key Features

This Cummins part is characterized by its durable material composition and precise design. Crafted from high-quality materials, it offers resistance to wear and environmental factors, ensuring longevity and reliability. The gasket’s design enhances its sealing capabilities, providing a secure fit within the engine system. These features are integral to its functionality, ensuring effective ventilation and protection of the engine components ³.

Benefits

Using the Cummins Breather Gasket 3999820 offers several advantages, including improved engine efficiency, reduced maintenance requirements, and enhanced durability. Its durable construction reduces the need for frequent replacements, contributing to lower maintenance costs. Additionally, the gasket’s design and material quality ensure it can withstand the demanding conditions of commercial truck operations, providing long-term reliability.

Troubleshooting and Maintenance

Common issues with breather gaskets may include leaks or blockages, which can affect engine performance. Troubleshooting involves inspecting the gasket for signs of wear or damage and ensuring it is properly seated within the engine system. Regular maintenance practices, such as checking the condition of the gasket during routine engine inspections, can help identify potential issues early and ensure the longevity and effectiveness of the Cummins Breather Gasket 3999820.

Compatibility with Cummins Engines

The Breather Gasket 3999820 is designed to fit a variety of Cummins engines, ensuring a proper seal and preventing contaminants from entering the engine’s crankcase. This gasket is critical for maintaining engine efficiency and longevity. Below is a detailed breakdown of the engines with which this part is compatible:

B6.7 Series Engines

• B6.7 CM2350 B135B
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• QSB6.7 CM2250
• QSB6.7 CM2350 B105
• QSB6.7 M CM2250

ISB Series Engines

• ISB (Chrysler)
• ISB CM2150

Application Considerations

When installing the Breather Gasket 3999820, it is essential to ensure that the gasket is properly aligned and seated to avoid any air leaks or contamination. Regular maintenance and inspection of the gasket can help prolong the life of the engine and maintain optimal performance.

Role of the Cummins Breather Gasket 3999820 in Engine Systems

The Cummins Breather Gasket 3999820 is an essential component in the efficient operation of various engine systems. It integrates seamlessly with the crankcase breather system, ensuring the crankcase remains properly ventilated by allowing the release of gases and vapors that accumulate during engine operation. This maintains optimal pressure levels within the crankcase.

When installed, the Breather Gasket works in conjunction with the crankcase breather plumbing to direct these expelled gases away from the engine compartment. This system is further supported by the hardware kit, which provides the necessary fittings and connections to ensure a secure and leak-free installation.

In the context of a long block or long block kit, the Breather Gasket plays a significant role in the overall assembly. It is positioned between the plate cover and the upper engine components, forming a seal that prevents the escape of gases into unwanted areas. This seal is particularly important when dealing with the upper gasket and upper engine gasket kit, as it ensures that the gaskets perform their intended function without interference from stray gases.

The valve cover and valve cover arrangement also benefit from the presence of the Breather Gasket. By ensuring that the breather system operates efficiently, the gasket helps maintain a clean and dry environment within the valve cover, which is essential for the longevity and performance of the valve train components.

Conclusion

In summary, the Cummins Breather Gasket 3999820 is a vital element in the ventilation and sealing mechanisms of various engine systems, contributing to the overall efficiency and reliability of the engine. Its durable construction, precise design, and compatibility with a wide range of Cummins engines make it an indispensable component for maintaining engine health and performance.