BMW F20 F21 F30 LCI M140i 340i B58 Hose Pipe Cylinder Head 8616555

BMW F20 F21 F30 LCI M140i 340i B58 Hose Pipe Cylinder Head is an original cooling system component designed for BMW models equipped with the modern B58 engine. Thanks to its factory geometry and perfect fit for standard connectors, it ensures stable coolant flow and proper integration with other system components. It is a practical solution for users who want to restore proper engine operation after a failure or are planning preventive maintenance.

Specifications and technical data

• SKU: 8616555
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8616555
• Substitutable numbers: 8616555, 17128616555
• Category: Coolant Hoses

Purpose and function in the cooling system

The presented hose belongs to the Cooling system hoses and pipes category, responsible for transporting coolant between key engine components and accessories. In B58 engines used in the BMW 1 Series F20 and 3 Series F30, proper fluid flow has a direct impact on:

• maintaining a stable operating temperature for the high-power gasoline engine,
• reducing the risk of overheating during dynamic driving,
• even cooling of the engine block, cylinder head, and accessories.

Selecting the correct water hose is particularly important in turbocharged engines, where thermal loads are higher than in naturally aspirated units.

Construction and fitment for BMW F20 / F30

The water hose has been designed specifically for the engine bay architecture of the BMW F20 and F30 with the B58 unit, which translates into:

• a properly profiled hose path, minimizing stress and the risk of abrasion,
• compatibility with factory cooling system connectors and fittings,
• maintaining the original routing of the hose in the engine bay.

The original BMW origin helps maintain consistency with other system elements, which facilitates installation and subsequent diagnostics of potential leaks.

Benefits of using an original water hose

Using a dedicated water hose in the B58 engine provides measurable operational benefits:

• Stable cooling system operation – the correct cross-section and length of the hose promote the maintenance of proper pressure and fluid flow.
• Better resistance to operating conditions – the hose is adapted to the temperatures and pressures typical of high-power units.
• Consistency with the factory design – no need for modifications, fitting universal hoses, or using additional clamps.

For M140i and 340i model users, this is a practical way to maintain factory cooling parameters, which is important both in daily driving and under higher engine loads.

Component condition and service application

The item comes from the used parts group, which allows for an economical repair of the cooling system while maintaining the manufacturer's original specifications. This type of hose is particularly useful in situations where:

• the existing hose has cracked, delaminated, or shows visible signs of wear,
• a quick replacement of the component is necessary without waiting for new deliveries,
• the priority is to maintain factory fitment for a specific engine version.

Before installation, it is recommended to perform a standard check of the cooling system, including the tightness of other hoses, the condition of the radiator, and the quality of the coolant.

Technical support and additional information

To better understand the impact of water hoses and other components on engine durability, it is worth checking out the guide on cooling system diagnostics and service: Engine cooling system – overheating, repair, and used radiators. The article helps assess when replacing a hose is part of broader service maintenance and when it is a reaction to a specific failure.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as water pipes, return hoses, or pipes connecting to the radiator, check out the available parts in the BMW cooling system hoses and pipes category.