Engine Balance Shaft BMW E87 LCI E90 E91 118i 120i 320i N43 Oil Pump 7559947

Engine Balance Shaft BMW E87 LCI E90 E91 118i 120i 320i N43 Oil Pump is an original component from the Oil pumps and parts category, designed for the lubrication system of BMW N43 series petrol engines in E87 LCI, E90, and E91 models. Using a factory BMW solution ensures proper oil pressure, stable engine operation, and safe conditions for the bearings, crankshaft, and timing system.

Specifications and technical data

• SKU: 7559947-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7559947
• Substitutable numbers: 11417559947, 7559947, BG
• Category: Oil Pumps & Parts

Purpose and function in the lubrication system

The balance shaft and oil pump assembly is responsible for mechanically driving and pumping oil within the N43 engine, ensuring an adequate flow of lubricant to the oil channels, cylinder head, crankshaft, and variable valve timing systems. A correctly selected oil pump assembly is crucial for maintaining stable pressure across the entire RPM range, which reduces the risk of seizing mating components and premature engine wear.

For N43 units, where the lubrication system operates under high thermal loads, using an original BMW solution allows for maintaining the parameters specified by the manufacturer without the need for adaptation or structural modifications.

Benefits of using an original BMW assembly

Choosing a factory BMW component from the Oil pumps and parts category ensures:

• maintenance of the factory oil pressure characteristics in the N43 engine,
• proper cooperation with the existing pump drive and timing system,
• consistency with factory tolerances and component fitment,
• reduction of the risk of leaks and pressure drops resulting from imprecise fitment.

As a result, the balance shaft and oil pump assembly can be used both for preventive repairs (e.g., at higher mileage) and when addressing the consequences of lubrication system failures, where replacing the entire pump drive module is necessary.

Application in service and N43 engine overhaul

This component is particularly suitable during engine overhauls, bearing replacements, crankshaft regeneration, or when diagnosing oil pressure drops. Using a complete balance shaft and oil pump assembly allows you to:

• minimize installation time by maintaining factory geometry,
• reduce the number of potential failure points in the lubrication system,
• restore proper engine operating conditions without the need to experiment with aftermarket replacements.

A used OEM component is a good choice in situations where reasonable repair costs are important while maintaining the original design and compatibility with other engine sub-assemblies.

Part selection and compatibility with reference numbers

Before purchasing, it is recommended to verify the compatibility of the component with the specific version of the N43 engine and the E87 LCI, E90, or E91 body year using the OEM part number and available interchangeable numbers in the technical specification. This helps avoid installation issues and ensures full compliance with BMW's factory service documentation.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as pump housings, drives, or additional lubrication modules, check the available parts in the BMW oil pumps and parts category.

Used components and repair economy

Using a used, original balance shaft and oil pump assembly allows for a significant reduction in service costs compared to purchasing a new module, while maintaining the design intended by the manufacturer. This solution is particularly attractive for older BMW vehicles, where optimizing the repair budget is of great importance.

If you are considering a wider use of second-hand components in your car and want to learn practical tips regarding the quality and cost-effectiveness of such solutions, it is worth reading the article Audi on second-hand parts – tuning and repairs without losing quality, which describes how to reasonably use components from the secondary market in premium class cars.