BMW F20 F30 LCI B48 Coolant Pipe Expansion Tank Cylinder Head Hose Line 8677244

BMW F20 F30 LCI B48 Coolant Pipe Expansion Tank Cylinder Head Hose Line is an original cooling system component used in Mini vehicles with petrol engines. As a part of the Cooling system pipes and hoses group, it ensures stable coolant flow between the expansion tank and the cylinder head, which translates into safe operating conditions for the power unit. The used OEM component is a sensible choice for drivers looking for a technically matched solution at an attractive price.

Specifications and technical data

• SKU: 8677244
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 8677244
• Substitutable numbers: 8677244, 17128677244, 8740118, 17128740118, 8616536, 17128616536
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and function in the cooling system

This hose is designed to work with B48 petrol engines in BMW F-series models after the LCI facelift, where it is responsible for the controlled flow of coolant between the expansion tank and the cylinder head. A properly selected hose in this section of the cooling system helps maintain a stable engine operating temperature, reduces the risk of overheating, and supports even venting of the circuit.

Thanks to its factory geometry and internal diameter, the hose ensures the correct flow of the working medium, which is important both during calm driving and in conditions of higher thermal load, typical for turbocharged units.

Advantages of using an original Mini hose

Using an original hose from the Cooling system pipes and hoses group provides a number of practical assembly and operational benefits:

• factory fitment to the expansion tank and cylinder head connectors,
• properly selected material flexibility, facilitating installation in the tight space of the engine bay,
• maintaining the correct routing of the hose in relation to other engine accessories,
• compatibility with original clamps and mounting brackets.

The used OEM element allows for maintaining the consistency of the entire cooling system, which is particularly important in petrol units where a stable operating temperature affects the durability of seals, the cylinder head, and accessories.

Condition, verification, and technical fitment

The hose comes from disassembly and is offered as a used original element, which means it retains the manufacturer's factory specifications. Before being included in the offer, such components are standardly verified for tightness, lack of cracks, and excessive deformation so that they can safely operate in the petrol engine cooling system.

Before purchasing, it is worth comparing the shape and routing of the hose with the element currently installed in the vehicle and verifying compatibility by the OEM part number or interchangeable numbers in the technical specifications section. Such an approach minimizes the risk of mismatch and speeds up the assembly process.

Operation in petrol engines and service tips

In B48 petrol units, the hose connecting the expansion tank to the cylinder head operates under conditions of elevated temperature and pressure, which is why its condition has a direct impact on the reliability of the entire cooling system. Replacing a worn or brittle hose with a functional OEM element allows for reducing the risk of leaks, coolant level drops, and engine overheating.

To better understand the impact of external temperatures on the cooling system and the importance of functional components, it is worth reading the guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings, which describes practical aspects of operation and selection of cooling elements.

Expanding the cooling system in Mini vehicles

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mini and need other elements from the same group, such as additional pipes, flexible hoses, or sections connecting to the radiator, check the available parts in the Mini cooling system pipes and hoses category.

A well-selected set of pipes and hoses in one vehicle facilitates later diagnostics, reduces the number of potential leak points, and allows for maintaining a consistent service standard for the entire cooling system.