BMW E87 E90 E91 120i 320i Petrol N46 Engine Cylinder Head 7505422 RECONDITIONED

BMW E87 E90 E91 120i 320i Petrol N46 Engine Cylinder Head RECONDITIONED is a precisely prepared, reconditioned component from the Cylinder Heads category, designed for N46 petrol units. This is a solution for users expecting stable engine operation, correct compression, and compliance with BMW factory standards.

Specifications and technical data

• SKU: 7581140-1
• Mark: BMW (Genuine OE)
• Condition: Remanufactured
• OEM Part Number: 7581140
• Substitutable numbers: 11127581140, 7581140, 11127550540, 7550540, 7505422
• Fuel type: Petrol
• Category: Cylinder Heads

Purpose and compatibility

The offered cylinder head is dedicated to N46 petrol engines used in BMW 1 Series E87 and 3 Series E90 models in 120i and 320i versions. The design, based on the original BMW project, ensures proper routing of intake and exhaust ports, correct valve operation, and adequate sealing of the combustion chamber under typical operating conditions for these units.

By maintaining factory geometric parameters, the cylinder head works with standard engine accessories, which facilitates installation and reduces the risk of fitment issues. This is particularly important for repairs where repeatability and compliance with BMW service documentation are crucial.

Technical characteristics and reconditioning process

The cylinder head comes from the group of reconditioned BMW components, which means it has undergone specialized machining and inspection processes. Typical stages include cleaning, leak testing, checking the flatness of the mating surface to the block, and assessing the condition of valve seats and guides. The goal is to restore operating parameters close to factory specifications while maintaining high repeatability.

Adaptation for petrol fuel ensures that the geometry of the combustion chamber, ports, and mixture flow are optimized for N46 petrol units. This allows for maintaining proper performance, smooth operation, and combustion efficiency, as well as facilitating diagnostics during future operation.

Benefits of using a reconditioned BMW cylinder head

Using a reconditioned cylinder head in an N46 engine allows in many cases to significantly reduce repair costs compared to purchasing a new component, while maintaining a high level of safety and functionality. For workshops and users, this means:

• the ability to restore correct compression and stable operation of the power unit,
• maintaining compliance with the original BMW design,
• easier installation thanks to compatibility with standard accessories,
• more predictable operating parameters compared to replacements of uncertain origin.

Additionally, the reconditioned state helps reduce raw material consumption and aligns with an approach that assumes the reuse of original components while maintaining required technical standards.

Application in service practice

The cylinder head in N46 units is responsible for proper valve operation, combustion chamber sealing, and effective heat dissipation. Its replacement is recommended, among other things, after severe overheating, mechanical damage within the valve seats, or cracks in the body. Using a prepared component from the Cylinder Heads category allows for shortening repair time, as key machining processes have already been performed.

In workshop practice, such a cylinder head is a good choice for comprehensive engine overhauls when it is necessary to restore the correct geometry and tightness of the system, while controlling the costs of the entire service operation is also important.

Expanding the scope of repairs and technical knowledge

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 cylinder head bodies, covers, or additional components related to the timing system, check the available parts in the BMW Cylinder Heads category.

For a comparison of solutions used in other brands and optimization of repair costs, it is also worth familiarizing yourself with the analysis of the evolution of Volkswagen units – practical information can be found in the article Volkswagen 1.9 TDI vs 1.4 TSI – evolution of VW engines and repair costs, which shows how the selection of appropriate parts affects the service budget.