BMW 3 5 7 Series E60 E65 E90 E91 M57N2 Breather Cylinder Head Engine 7794597

BMW 3 5 7 Series E60 E65 E90 E91 M57N2 Breather Cylinder Head Engine is an original component from the Cylinder Heads group, designed for the engine systems of popular BMW 5 and 3 Series models. As an OEM part, it ensures consistency with the factory design of the powertrain, supporting proper ventilation and stable engine operation. A used component of this type is a reasonable choice for maintenance or repairs when you want to maintain the factory performance characteristics.

Specifications and technical data

• SKU: 7794597
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7794597
• Substitutable numbers: 11127794597, 7794597
• Category: Cylinder Heads & Valve Covers

Purpose and function of the breather valve

The breather valve in BMW E60, E65, E90, and E91 operates in the cylinder head area, where it is responsible for the controlled discharge of gases from inside the engine. A properly functioning element of this type:

• supports stable pressure in the system,
• reduces the risk of blow-by and unwanted leaks,
• helps maintain smooth engine operation across the full load range.

Thanks to its fitment for specific 5 and 3 Series generations, the valve works with the factory cylinder head geometry, which promotes predictable engine behavior after repair.

Benefits of using an original BMW component

Choosing an original BMW breather valve from the Cylinder Heads group primarily ensures the preservation of the parameters specified by the manufacturer. This means:

• compatibility with the factory channel layout in the cylinder head,
• proper cooperation with other elements of the ventilation system,
• reduced risk of installation issues compared to aftermarket replacements.

Using OEM parts in the cylinder head area is particularly important as it affects engine refinement, durability, and the repeatability of parameters after service.

Installation characteristics and application

The presented valve is intended for installation in units where it was structurally designed within the cylinder head. Thanks to this:

• you maintain the original routing of the ventilation channels,
• you minimize the need for modifications or adaptations,
• you facilitate future diagnostics, as the system remains consistent with BMW service documentation.

The used condition allows for an economical restoration of system efficiency while maintaining the original design specification. This is a solution often chosen for maintenance repairs when functionality and compliance with the factory design are the priority.

Integration with the cylinder head system and durability

As an element from the Cylinder Heads category, the valve works directly with oil and gas channels in the upper part of the engine. A properly selected component:

• reduces the risk of excessive crankcase pressure,
• supports the maintenance of system tightness,
• allows for stable operating conditions during start-up and under load.

Thanks to this, when servicing the cylinder head, you can restore the correct operating conditions of the powertrain without interfering with the original BMW design concept.

Expanding the scope of repair and related elements

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as additional valves, fasteners, or components working with channels in the cylinder head, check the available parts in the BMW Cylinder Heads category.

If you are working on newer generation BMW units and want to better understand the relationships between engine accessories, turbocharging, and cooling systems, the Global Parts practical guide may be helpful – BMW B58 Code – checklist before buying a turbocharger and intercooler for BMW 3 Series (G20), which shows how to approach component selection based on OEM data and VIN verification.