BMW E90 E91 LCI 318d N47N Engine Piston Head 7812549

BMW E90 E91 LCI 318d N47N Engine Piston Head is an original component from the Pistons and rings category, designed for BMW 3 Series diesel units with the N47N engine. This used OEM component allows for a technically correct repair of the piston-head section, maintaining the factory operating parameters of the diesel engine.

Specifications and technical data

• SKU: 7812549-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7812549
• Substitutable numbers: 11257812549, 7812549, 11247812640, 7812640, KZ
• Fuel type: Diesel
• Part type: Piston
• Category: Pistons & Rings

Purpose and technical characteristics

The presented engine piston with head is dedicated to the N47N power unit used in BMW E90 and E91 models after the facelift. The design, prepared for a diesel engine, ensures the appropriate thermal and mechanical strength required for the high combustion pressures typical of modern diesels. Combining the piston with the head into a single assembly facilitates servicing of the cylinder section, reduces the risk of component mismatch, and allows for consistent operating parameters within a given cylinder. This solution is particularly important when repairing N47N units, where assembly precision has a direct impact on the engine's refinement and durability.

Advantages of using an original piston with head

Choosing an original element from the Pistons and rings category for a BMW brings a number of operational benefits:

• preservation of the factory geometry of the piston and combustion chamber in the head,
• proper fit for the operating characteristics of the N47N engine,
• material consistency with other components of the power unit,
• ability to properly maintain combustion parameters in a diesel engine. As a result, the repair is more predictable, and the risk of problems such as loss of compression or uneven engine operation is reduced.

Condition of the element and service application

The offered engine piston with head is a used component, which allows for an economical yet technically correct repair of the power unit. This type of component is particularly useful for:

• local damage to a single cylinder,
• repairs after seizing or overheating of a specific engine area,
• rebuilding the unit after a mechanical failure in the piston-head section. Using a complete piston-head assembly facilitates the mechanic's work, shortens assembly time, and reduces the risk of errors associated with selecting incompatible spare parts.

Selection by numbers and support for online purchases

When selecting such elements for a BMW 3 Series, it is crucial to compare the OEM part number and interchangeable numbers with the vehicle documentation and manufacturer data. Proper identification allows you to avoid compatibility issues within a specific N47N engine version and E90/E91 LCI model year. If you would like to learn more about verifying component compatibility by numbers, the following practical guide will be helpful: Risk-free online parts shopping – 5 proven ways to verify component compatibility using OEM numbers and paint codes. You will find tips there regarding the selection of elements for BMW engines and other premium brands.

Expanding repairs within the piston-cylinder system

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 pistons, rings, or cooperating cylinder components, check the available parts in the BMW Pistons and rings category. This allows you to renew the entire piston-cylinder section in one service stage, which positively affects the smoothness of the unit's operation, compression parameters, and the long-term reliability of the diesel engine in your BMW.