BMW F45 B38X Automatic Gearbox Oil Pump Actuator 8617804

BMW F45 B38X Automatic Gearbox Oil Pump Actuator is an original component from the Oil pumps and parts group, designed for drivetrain systems in BMW vehicles with a petrol engine and automatic transmission. This used OEM part ensures factory-fit, stable transmission oil pressure, and predictable gearbox performance in daily operation.

Specifications and technical data

• SKU: 8617804-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8617804
• Substitutable numbers: 8617804, 24008617804
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Oil Pumps & Parts

Purpose and function of the automatic transmission oil pump

The presented pump is responsible for the circulation and maintenance of operating oil pressure in the automatic transmission, which is crucial for proper gear engagement, clutch operation, and hydraulic control. In BMW B38X family petrol units, stable lubrication of the automatic transmission reduces the risk of slippage, overheating, and accelerated wear of friction elements.

Thanks to its OEM design, the pump works with the factory control system, maintaining the parameters specified by the vehicle manufacturer. This solution is particularly important for cars equipped with advanced gear-shifting strategies, where oil pressure precision translates into the smoothness and consistency of the gearbox operation.

Benefits of using an original used BMW pump

Using an original automatic transmission oil pump in a BMW F45 B38X allows you to maintain:

• factory transmission performance characteristics – predictable, consistent gear shifting across the entire load range,
• compatibility with the existing hydraulic system and transmission control unit,
• proper oil flow distribution to clutches, valves, and lubrication channels.

A used OEM part from the Oil pumps and parts category is also a reasonable compromise between repair costs and maintaining the quality and fit intended by the manufacturer. In many cases, this allows for restoring proper gearbox operation without the need for a costly replacement of the entire transmission.

Operating parameters in a petrol system with an automatic transmission

The pump has been designed to work with a petrol engine and an automatic transmission, which means it is adapted to the torque characteristics of the B38X unit and the specific operation of the gearbox in this drivetrain. In practice, this translates into:

• stable oil pressure at both low and high engine speeds,
• proper lubrication of transmission components during city and highway driving,
• maintenance of the correct operating temperature of the transmission fluid.

By adhering to factory design assumptions, the pump supports long-term, repeatable gearbox operation, which is important both after repairs and during preventive replacement of oil system components.

Condition, fitment, and service application

The offered pump is a used component, sourced from dismantling, which allows for an economical repair of the drivetrain while maintaining original BMW specifications. Before installation, a standard service procedure is recommended: checking the cleanliness of oil channels, verifying the condition of the transmission oil pan, filters, and the quality of the transmission fluid.

In workshop practice, this type of pump is used both for reactive repairs (after symptoms of pressure drop or gearbox errors occur) and for comprehensive transmission regeneration. Proper selection of parts based on manufacturer numbers and verification of compatibility with the specific version of the automatic transmission helps avoid problems with installation and vehicle startup.

If you are planning a comprehensive repair or upgrade of the automatic transmission lubrication system in your BMW and need other components from the same group, such as pump housings, drive elements, or additional hydraulic sub-assemblies, check the available parts in the BMW oil pumps and parts category.

Ecological aspect and conscious choice of parts

By choosing an original used automatic transmission oil pump, you reduce the consumption of raw materials and energy needed to produce a new component. This is a solution that is beneficial not only economically but also from the perspective of sustainable vehicle operation. You can find more about the impact of such decisions on the environment in the article Sustainable automotive: How purchasing original used parts reduces the carbon footprint and protects the environment?.