BMW F20 F21 F30 F31 LCI B58 Vent Breather Hose Pipe Line 7637521

BMW F20 F21 F30 F31 LCI B58 Vent Breather Hose Pipe Line is an original component from the Lines, hoses and pipes group, designed for use in modern B58 engines in facelifted BMW 1 and 3 series models. This used OEM component ensures proper gas discharge and stable engine operating conditions, which translates into safe vehicle operation.

Specifications and technical data

• SKU: 7637521-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7637521
• Substitutable numbers: 11157637521, 7637521, EM
• Category: Other Air & Fuel Delivery

Purpose and function of the vent breather hose

The offered vent breather hose is a component of the engine system in B58 units used in facelifted (LCI) BMW F20, F21, F30, and F31 models. Its task is the controlled discharge of gases from selected areas of the engine, which helps maintain correct operating pressure and reduces the risk of unwanted leaks or disruptions in the operation of accessories.

A properly selected hose from this group:

• supports the stable operation of the lubrication and crankcase ventilation system,
• limits the possibility of overpressure building up in the engine housing,
• reduces the risk of vapors entering areas where they could cause contamination or accelerated wear of other components.

Benefits of using an original BMW hose

Using an original vent breather hose in the B58 engine ensures a perfect fit to the factory geometry of the power unit and compatibility with other system components. Thanks to this:

• the correct routing of the hose is maintained, which minimizes the risk of abrasion and stress,
• connections at the ports and joints are tight, which limits the possibility of leaks,
• compliance with the manufacturer's factory requirements regarding flow and material resistance is maintained.

This used OEM component is a solution that allows you to combine technical installation correctness with reasonable service costs, especially in the case of maintenance repairs on B58 engines.

Condition, verification, and service application

The hose comes from dismantling and is offered as a used part, which in practice means that it was previously used in a vehicle but is suitable for further use after proper installation. This type of component is particularly useful for:

• repairs of the ventilation system after detecting leaks or cracks in the hoses,
• servicing B58 units after modifications or interference with engine accessories,
• comprehensive replacement of rubber and plastic elements within the crankcase ventilation system.

For users considering the choice between new and used engine system components, the guide article Car parts – new or used? We compare costs, quality, and durability, which discusses the differences in costs, durability, and availability of components, may be helpful.

Product group – BMW Lines, hoses and pipes

The vent breather hose from the B58 unit belongs to a wide group of elements responsible for the transport of fluids and gases within the engine and accessories. 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 fluid lines, vacuum hoses, or cooling system pipes, check the available parts in the BMW Lines, hoses and pipes category.

Summary of application in BMW F20, F21, F30, F31 LCI B58

BMW F20 F21 F30 F31 LCI B58 Vent Breather Hose Pipe Line is a practical service solution for users of 1 and 3 series models equipped with the modern B58 unit. The original nature of the part helps maintain factory engine performance parameters, and its used condition allows for optimizing repair costs without sacrificing the fit to the specific vehicle configuration. Choosing this component is particularly beneficial for ventilation system repairs, where proper hose geometry, connection tightness, and compliance with the BMW engine design are essential.