BMW E90 E91 LCI F10 F11 Piston 325d 330d 525d 530d N57 Diesel Engine 7805329

BMW E90 E91 LCI F10 F11 Connecting Rod Piston 325d 330d 525d 530d N57 is an original part from the Pistons and Rings group, designed for BMW 3 and 5 Series diesel engines. The design adapted for Diesel units ensures proper load transfer in modern N57 engines, maintaining the crankshaft-piston system's factory operating parameters.

Specifications and technical data

• SKU: 7805329-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7805329
• Substitutable numbers: 7805329, 11257805329
• Fuel type: Diesel
• Part type: Piston
• Category: Pistons & Rings

Application and Compatibility

The presented connecting rod piston is dedicated to facelifted (LCI) BMW E90 and E91 models, as well as F10 and F11 with 325d, 330d, 525d, and 530d engines based on the N57 unit. This makes it the right choice for crankshaft system repairs in diesel-powered vehicles where compliance with the piston's factory geometry and operating characteristics is required.

The part comes from the original BMW production line, which translates to maintaining appropriate assembly clearances, correct piston weight, and compatibility with standard connecting rods and cylinders in N57 engines.

Technical Characteristics and Role in a Diesel Engine

A piston operating in a Diesel unit must withstand high combustion pressures and thermal loads, making the use of a component with appropriate material strength and precise machining crucial. An original BMW connecting rod piston ensures:

• stable operation across the entire N57 engine speed range,
• proper sealing of the combustion chamber in conjunction with piston rings,
• correct cylinder guidance, reducing cylinder wall wear and engine noise.

Using a component from the same design group as the factory original minimizes the risk of vibrations, uneven operation, and reduced engine efficiency, which is particularly important in modern engines with advanced injection control.

Benefits of Using an Original BMW Connecting Rod Piston

Choosing an original connecting rod piston for BMW E90, E91 LCI, F10, and F11 allows for the consistency of the entire crankshaft-piston system. The main advantages include:

• Factory Fitment – maintaining geometry and weight consistent with other N57 engine components.
• Stable Operating Parameters – correct compression and even fuel mixture combustion in a diesel engine.
• Seamless Integration – can be installed in place of a worn part without the need for structural modifications.

This makes the connecting rod piston suitable for both standard engine repairs and comprehensive engine rebuilds where parameter repeatability and compliance with BMW service documentation are crucial.

Condition, Verification, and Service Application

The part comes from the used parts group, allowing for economical repair while maintaining the original manufacturer's specifications. This type of component is particularly useful when a single connecting rod piston needs replacement after localized damage or for selective repairs in N57 engines.

Before installation, standard workshop procedures are recommended: checking cylinder bores, verifying the connecting rod, checking assembly clearances, and selecting appropriate piston rings from the same dimensional group. This approach helps restore proper engine operation and reduce the risk of further engine intervention.

BMW Pistons and Rings – Crankshaft System Expansion

If you are planning a comprehensive repair or modernization of the engine area in your BMW and need other parts from the same group, such as additional pistons, ring sets, or cooperating crankshaft components, check the available parts in the BMW Pistons and Rings category.

To better plan service work and reduce vehicle downtime at the workshop, it's worth familiarizing yourself with practical tips on using a wide range of parts from a single warehouse – find more information in the article No More Weeks of Waiting – How a Wide Range of Parts in One Warehouse Actually Reduces Your Car's Downtime at the Mechanic?.