Water Pump BMW G11 G12 G20 G21 G30 G31 B57 Engine Coolant Pump 8482250

The BMW G11 G12 G20 G21 G30 G31 B57 Coolant Water Pump 8482250 is an original part from the Water Pumps group, designed for use in modern BMW diesel engines from the B57 family. A used OEM pump ensures a factory fit, proper coolant circulation, and stable engine thermal conditions, which translates to safe and predictable powertrain operation.

Specifications and technical data

• SKU: 8582740
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8582740
• Substitutable numbers: 8582740, 11518582740
• Category: Water Pumps

Purpose and Role in the BMW Cooling System

The presented coolant pump is a component of the cooling system for the B57 diesel engine used in BMW series G11, G12, G20, G21, G30, and G31. Its function is to force the circulation of coolant between the engine block, cylinder head, radiator, and other thermal components, ensuring that the operating temperature is maintained within the optimal range during city driving, highway driving, and under higher loads.

Thanks to its factory design, the pump works with the original engine accessories, maintaining correct flow and pressure parameters. This is crucial for protecting the powertrain from overheating, local thermal hotspots, and accelerated wear of internal components.

Benefits of Using an Original BMW Water Pump

Using an original pump from the Water Pumps group in a B57 engine offers a range of practical technical benefits:

• factory fit to the engine block and accessories, without the need for mounting modifications,
• maintenance of BMW's designed coolant flow parameters,
• consistency with the factory engine temperature control strategy,
• reduced risk of leaks resulting from imprecise fitment of aftermarket alternatives.

For the user, this means stable engine operation, predictable performance across a wide range of loads, and a lower risk of costly failures related to overheating. Choosing an original pump is particularly important in modern diesel designs where the cooling system interacts with advanced control and exhaust aftertreatment systems.

Selection by OEM Numbers and Compatibility

The pump has been specifically designed for B57 units used in selected BMW 5 Series, 7 Series, and 3 Series models in the G generation. Part selection should always be verified by the OEM number and interchangeable numbers, as well as using the vehicle's VIN. This approach minimizes the risk of installing an incorrect variant and guarantees full compatibility with the specific engine and accessory configuration.

If in doubt, it is advisable to use professional catalog tools or seek service support to confirm the pump's compatibility with the specific B57 engine version and vehicle year. A correctly selected pump ensures proper port positioning, correct rotation direction, and appropriate cooperation with the drive belt or other drive mechanism used in the specific variant.

Part Condition and Installation Aspects

The offered pump is a used part, which in practice means an original BMW part from disassembly. Such OEM components are often chosen as a reasonable compromise between cost and maintaining factory quality of workmanship and fit. Before installation, a standard visual inspection is recommended, checking connection sockets and assessing the impeller's operation and any play according to service procedures.

The installation itself should be carried out in accordance with BMW's technical documentation for the B57 engine, observing the correct sequence of operations, tightening torques, and the cooling system bleeding procedure. A correctly performed pump replacement minimizes the risk of air ingress, leaks, and improper fluid circulation.

Technical Support and Additional Materials

Proper selection of engine fuel and accessory system components, including pumps, injectors, and fuel pumps, often requires broader knowledge of modern engine construction. To better understand the relationships between individual sub-assemblies and their diagnostic principles, it is worth referring to the article: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as auxiliary circulation pumps, housing components, or other parts responsible for coolant circulation, check the available parts in the BMW Water Pumps category.

To compare the cost-effectiveness of purchasing new and used parts, including original pumps, the guide: New or Used? Comparing the Costs and Quality of Car Parts, which discusses quality and cost differences, as well as practical aspects of operating used OEM parts, may also be helpful.