BMW E46 E60 E61 E87 E90 E91 M47N2 Mechanical Coolant Pump Water Cooling 7790471

BMW E46 E60 E61 E87 E90 E91 M47N2 Mechanical Coolant Pump Water Cooling is an original component from the Water pumps group, designed for BMW M47N2 family diesel engines. Its mechanical design ensures stable cooling of the power unit, which translates into safe operation of the diesel engine and its longer service life.

Specifications and technical data

• SKU: 7790471-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7790471
• Substitutable numbers: 11517790471, 7790471, 11517805808, 7805808, 11517791833, 7791833, 11517790322, 7790322, 11517788305, 7788305
• Fuel type: Diesel
• Category: Water Pumps

Purpose and compatibility

The presented coolant pump has been designed for use in popular BMW E46, E60, E61, E87, and E90 models equipped with the M47N2 diesel engine. By maintaining factory geometry and operating parameters, this component works with standard engine accessories, ensuring proper coolant circulation throughout the entire system.

Its original BMW origin facilitates a proper fit to the engine block, pulleys, and cooling hoses, which reduces the risk of leaks and installation issues. This solution is particularly beneficial for repairs where compliance with the manufacturer's service documentation is important.

Technical characteristics and role in the cooling system

The mechanical coolant pump in the M47N2 diesel engine is responsible for forcing coolant circulation between the block, cylinder head, radiator, and heater core. Stable flow allows for maintaining the optimal operating temperature, which is important for both performance and the durability of the power unit.

Key advantages of this solution include:

• constant, predictable operation dependent on engine speed,
• maintenance of cooling parameters consistent with BMW factory specifications,
• resistance to typical operational loads in diesel engines,
• possibility of use as a replacement for the factory-installed pump without modifying the system.

Thanks to this, the pump will perform well both in standard city driving and in highway conditions, where the cooling system operates under higher thermal loads.

Condition, origin, and benefits of choosing a used part

The offered pump comes from the group of original BMW components and is sold as a used part. Such an element, when properly verified, can be a reasonable compromise between repair costs and maintaining factory build quality. In practice, this means the ability to restore the efficiency of the cooling system without the need to invest in more expensive solutions.

Choosing a used water pump is particularly attractive for older BMW vehicles, where the priority is to keep the vehicle in good technical condition at controlled service costs. The original design also facilitates easier diagnostics and potential future replacement, as the operating parameters are known from the manufacturer's documentation.

Practical installation and maintenance tips

When replacing a mechanical coolant pump in a diesel engine, it is worth paying attention to several service aspects:

• checking the condition of the accessory drive belt and idler pulleys,
• verifying the tightness of cooling system hoses and connectors,
• properly bleeding the system after refilling with fresh coolant,
• checking the engine operating temperature after installation to confirm proper fluid circulation.

Such an approach helps reduce the risk of engine overheating and ensures stable operating conditions, which is important for the durability of the diesel engine.

Technical support and part selection by numbers

The pump belongs to a group of components for which correct selection based on catalog numbers and manufacturer markings is essential. In case of doubt, it is worth using service documentation or specialist support to ensure that the selected component is compatible with the specific engine version and vehicle model year.

For users interested in a broader look at diagnostics and the selection of diesel engine power components, an article discussing the principles of operation and servicing of the fuel system may be helpful – you can find it here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

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 housings, impellers, or seals, check the available parts in the BMW Water pumps category.