BMW E90 E91 F10 F11 Piston With Conrod 325d 330d 525d 530d N57 7805329

BMW E90 E91 F10 F11 Piston With Conrod 325d 330d 525d 530d N57 is an original part from the Pistons and rings category, designed for BMW N57 family diesel engines in popular 3 Series and 5 Series models. This solution allows for professional engine repair while maintaining factory performance characteristics, smooth operation, and power output. By using the original piston and connecting rod geometry, the proper balance of the crankshaft-piston system is maintained, which is crucial for engine durability.

Specifications and technical data

• SKU: 7805329-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7805329
• Substitutable numbers: 7805329, 11257805329, 8508023, 11248508023
• Part type: Piston
• Category: Pistons & Rings

Purpose and compatibility with the N57 engine

The presented piston with connecting rod is dedicated to BMW N57 engines used in 3 Series E90/E91 and 5 Series F10/F11 models in 325d, 330d, 525d, and 530d versions. Using a component from the same engine family ensures a proper fit in the combustion chamber, correct piston height, and proper interaction with the crankshaft and connecting rod bearings. The original BMW crankshaft-piston system design guarantees the maintenance of factory compression parameters, correct operation across the full load range, and stable thermal conditions in the cylinder. This is particularly important in high-torque diesel engines, where the precision of the piston and connecting rod directly affects the unit's lifespan.

Construction and technical properties

Combining the piston with the connecting rod in one set facilitates service and reduces the risk of assembly errors. The components are factory-matched in terms of weight and geometry, which allows for maintaining the proper balance of the entire crankshaft system. In practice, this translates into less vibration, more stable idling, and lower loads on the bearings and crankshaft. In N57 engines, the piston operates under demanding pressure and temperature conditions, which is why it is crucial to use a component with the correct material structure, optimized crown shape, and properly designed cooling channels (if present in the specific version). Using the original piston-connecting rod set helps maintain the correct combustion characteristics, which promotes stable performance and proper operation of the fuel injection system.

Service application and assembly advantages

The piston with connecting rod set is particularly useful for:

• engine overhaul after seizing or damage to one of the cylinders,
• repair after engine overheating,
• service after a fuel injection or turbocharging system failure that led to mechanical damage in the combustion chamber. Using an original component from the Pistons and rings category reduces the need for additional machining and part fitting, which shortens repair time and decreases the risk of operational issues after the overhaul. The mechanic receives a component prepared for installation in accordance with BMW factory service procedures.

Characteristics of the used product

The item comes from dismantling, making it a cost-effective solution while maintaining the manufacturer's original specifications. A used piston with a connecting rod allows for an economical engine rebuild, especially in situations where only a single cylinder needs replacement rather than the entire set. A properly selected and inspected component of this type is often chosen by professional workshops specializing in BMW engine repairs. For many users, it is also important that using original parts from dismantling helps maintain the structural integrity of the engine, which can be significant for the vehicle's future resale value.

Support with selection and repair expansion

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other elements from the same group, such as additional piston sets, ring sets, or related crankshaft system components, check the available parts in the BMW Pistons and rings category. To better plan your repair and simultaneously take care of the vehicle's future value, it is worth learning about the impact of using original parts from dismantling on the car's price when selling – you can find more information in the article Original used parts vs. resale price – how not to lose money?.