Ventilation Valve BMW F90 M5 F91 M8 S63M Fuel Tank Pipe Cyl. 5-8 7852338

Ventilation Valve BMW F90 M5 F91 M8 S63M Fuel Tank Pipe Cyl. 5-8 is a component from the Hoses, harnesses, and connectors group, designed for the cylinder 5–8 bank in the S63M engine of the BMW M5 F90 model. It is an original BMW component that ensures proper gas circulation and stable engine operation under demanding operating conditions.

Specifications and technical data

• SKU: 7852338
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7852338
• Substitutable numbers: 7852338, 13907852338, KZ
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the S63M engine

The cylinder 5–8 ventilation valve in the S63M engine is responsible for the controlled discharge of gases from a specific section of the power unit, which supports stable system pressure and reduces the risk of unwanted turbulence in the combustion chamber area. A properly functioning component of this type helps maintain the smooth operation of the V8 biturbo engine and promotes the preservation of correct lubrication parameters and airtightness.

In advanced units such as the S63M, the precise operation of the ventilation system is significant for engine refinement, throttle response, and performance repeatability. Replacing a worn or damaged ventilation valve with an original component from the same design group allows for the restoration of correct operating conditions in the cylinder 5–8 section.

Component characteristics and assembly group

The ventilation valve belongs to the Hoses, harnesses, and connectors group, meaning it works in conjunction with other hoses and connectors in the engine bay to create a coherent gas flow and service connection system. The design provided by the vehicle manufacturer ensures a perfect fit with factory mounting points and compatibility with original harnesses and hoses in the BMW M5 F90.

The part is sourced from dismantling, making it a reasonable solution for users looking for original components at a more favorable price while maintaining compliance with factory specifications. This type of part is particularly useful for repairs of S63M units after high-mileage or track use, where the ventilation system operates under increased load.

Benefits of using an original BMW ventilation valve

Using an original ventilation valve in the S63M engine brings a number of practical benefits:

• preservation of the factory gas flow geometry in the cylinder 5–8 section,
• secure fit with existing hoses, harnesses, and connectors in the engine bay,
• reduction of the risk of leaks resulting from the use of non-original solutions,
• easier diagnostics and service due to compliance with manufacturer documentation.

For BMW M5 F90 users who drive their cars intensively, replacing ventilation system elements with original components helps maintain stable engine operating parameters and reduces the risk of secondary failures associated with improper gas discharge.

Part condition and practical service application

The offered ventilation valve is a used part, sourced from an original BMW system. This type of part works well in professional workshops specializing in servicing M5 F90 models, as well as for conscious users who personally monitor the condition of their engine system. Replacing the ventilation valve is recommended especially when symptoms of impaired ventilation appear, such as unstable engine operation in a specific RPM range or signs of leaks in the area of hoses and connectors.

In service practice, installing an original component from the same design group facilitates the consistency of the entire system and enables subsequent, precise computer diagnostics without the need to account for non-standard solutions.

System expansion and selection of 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 ventilation hoses, engine bay harnesses, or service connectors, check out the available parts in the BMW Hoses, harnesses, and connectors category.

For more extensive work on electronics and engine control in 3 and 5 series models, a practical guide on using parts from dismantling may be helpful – you can find it in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using parts from dismantling?.