Ford Mondeo MK4 Focus MK2 1.8 TDCi Diesel Water Coolant Pump XS4U-8512-BA

The Ford Focus MK2 1.8 TDCi Water Pump is an original cooling system component from the Water Pumps group, designed for diesel engines. This used water pump offers a functional service solution for drivers looking to restore proper coolant circulation in their diesel engine, while maintaining factory performance characteristics.

Specifications and technical data

• SKU: XS4U8512BA
• Mark: Ford
• Condition: Used
• OEM Part Number: XS4U8512BA
• Substitutable numbers: XS4U8512BA, XS4U-8512-BA
• Fuel type: Diesel
• Category: Water Pumps

Purpose and Function in the Cooling System

The water pump in a 1.8 TDCi engine is responsible for forcing the circulation of coolant between the engine block, cylinder head, and radiator, thereby stabilizing the engine's operating temperature. For diesel engines like the 1.8 TDCi, the correct functioning of the water pump is crucial for maintaining optimal combustion conditions, protecting against overheating, and reducing the risk of cylinder head gasket damage or deformation of aluminum components.

Selecting a pump specifically designed for a particular Ford model ensures the correct flow parameters, proper belt drive compatibility, and seamless integration with other cooling system components. This makes the replacement process predictable and ensures installation is carried out in an orderly manner, in line with manufacturer specifications.

Benefits of Using an Original Ford Water Pump

Using a water pump from the same design family as the original factory part ensures:

• preservation of the original impeller and housing geometry, leading to stable coolant flow,
• correct fitment to engine block mounting points and accessories,
• consistent operation with the accessory drive system (belt, pulleys, tensioners),
• maintenance of the engine's designed thermal characteristics for the diesel engine.

For diesel engines, it is particularly important for the cooling system to operate within a narrow temperature range. A properly selected water pump helps to minimize temperature fluctuations, which promotes even injection timing, stable compression, and longer engine oil life.

Professional Selection and Diagnostics for Diesel Engines

When replacing the water pump in a 1.8 TDCi engine, it is advisable to inspect the overall condition of the cooling system: check the integrity of hoses, the radiator, thermostat, and the quality of the coolant. A comprehensive service approach helps prevent recurring issues and ensures stable engine operation in the long term.

To better understand the relationship between the cooling system and the diesel engine's fuel supply, part selection by catalog numbers, and the impact of temperature on engine performance, it is recommended to consult specialized technical material. For extended information on diagnostics and fuel system component selection, refer to the article “Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair”, which consolidates knowledge on servicing modern diesel engines.

Application Area and Related Cooling System Components

Replacing the water pump in a Ford Focus MK2 1.8 TDCi often involves inspecting or replacing other cooling system components, such as rubber hoses, clamps, the radiator, expansion tank cap, or thermostat. This approach helps minimize service downtime and optimize labor costs.

If you are planning a comprehensive repair or upgrade of the engine area in your Ford and require other parts from the same group, such as additional water pumps, housings, or mounting elements, check the available parts in the Ford Water Pumps category.

Summary

The Ford Focus MK2 1.8 TDCi Water Pump is a practical service solution for diesel engine owners looking to restore cooling system efficiency while maintaining factory performance characteristics. A used component from the Water Pumps category allows for an economical yet technically sound repair, supporting safe daily operation of the diesel unit. With proper selection and correct installation, the water pump provides a solid foundation for continued, trouble-free powertrain operation.