BMW 1 3 E87 E90 E91 118i 120i 120i 320i N45 N46 Engine Oil Pump Balance Shaft

BMW 1 3 E87 E90 E91 118i 120i 120i 320i N45 N46 Engine Oil Pump Balance Shaft is an original component from the Oil pumps and parts group, designed for BMW N45 and N46 petrol engines in E87, E90, and E91 models. This is a solution for users who want to restore proper lubrication of the power unit while maintaining factory performance characteristics and high reliability of the oil system.

Specifications and technical data

• SKU: 7594471-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7594471
• Substitutable numbers: 11277594471, 7594471, 11277507646, 7507646, 11417559948, 7559948, 11277536191, 7536191, 061500421, KZ
• Category: Oil Pumps & Parts

Purpose and function in the lubrication system

The presented oil pump with balance shafts is responsible for maintaining stable oil pressure in BMW N45/N46 petrol engines used in popular 1 Series (E87) and 3 Series (E90, E91) models. A properly selected pump ensures continuous oil circulation in the lubrication channels, which reduces friction, minimizes wear of mating components, and helps keep the engine within a safe operating temperature range.

Thanks to a design consistent with BMW factory standards, this component works with the stock crankshaft-piston system and timing, maintaining correct oil flow parameters across the entire RPM range. This is particularly important for engines used in city traffic and during dynamic driving, where thermal and mechanical loads are significantly increased.

Original origin and interchangeable numbers

The pump comes from the BMW parts line, which means it maintains factory manufacturing tolerances and compatibility with dedicated engines. The component has an assigned OEM part number and a set of interchangeable numbers, which facilitates precise identification when selecting for a specific vehicle configuration. This allows you to safely replace a worn or damaged sub-assembly, minimizing the risk of fitment issues.

In practice, this means that a workshop or a user servicing the car independently can verify the pump's compatibility using both the original number and reference numbers, which speeds up the parts selection process and reduces the risk of purchasing an incompatible component.

Condition, verification, and service application

The offered oil pump is a used component, which in the case of original BMW parts often represents a beneficial compromise between repair costs and maintaining high manufacturing quality. This type of component is particularly useful for:

• engine overhauls after seizure or oil pressure drops,
• preventive pump replacement at higher mileages,
• rebuilding a power unit after a collision or mechanical failure.

Choosing an original, used oil pump allows you to maintain the structural integrity of the power unit, which is essential for long-term durability and stable engine operation. During installation, standard service procedures are recommended: checking clearances, cleanliness of oil channels, and correct alignment of the drive shafts.

Benefits of using an original BMW oil pump

Using this pump in N45/N46 engines provides a number of practical operational benefits:

• Factory compatibility – perfect fit for stock blocks and lubrication systems in E87, E90, and E91 models.
• Stable oil pressure across a wide RPM range, which promotes even lubrication of bearings, shafts, and the timing system.
• Reduced risk of overheating and accelerated wear of mating components.
• Suitability for professional workshop repairs and comprehensive power unit regeneration.

For users who want to collect original, used components for their car repair in one place, especially during major service work, a guide describing the one-stop-shop approach will be helpful – more information can be found in the article Comprehensive supply of used car parts.

Expansion of the lubrication system in BMW

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 additional pumps, drive modules, or mounting elements, check the available parts in the BMW oil pumps and parts category.

This allows you to renew the entire lubrication system in a single service process, reducing vehicle downtime and ensuring the consistency of the technical solutions applied.