BMW 3 Series E90 320 si N45 Engine Cylinder Head Cover 7565742 7777347

BMW 3 Series E90 320 si N45 Engine Cylinder Head Cover is an original engine component designed for use in the N45 engine in the 320 si version. The cover is responsible for tightly sealing the upper part of the cylinder head, ensuring stable operation of the valve train, and proper oil vapor discharge, which is essential for trouble-free engine operation and maintaining optimal performance parameters. Using an OEM component allows for maintaining factory geometry and fitment, which is particularly important in the precisely tuned BMW 3 Series E90 units.

Specifications and technical data

• SKU: 7565742
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7535742
• Substitutable numbers: 17127535742, 7535742, 7777347
• Category: Other Engine Parts

Function and role of the valve cover in the N45 engine

The valve cover in the N45 engine performs several key structural and operational tasks:

• ensures a tight seal for the upper part of the cylinder head, limiting oil leaks and gas blow-by,
• stabilizes valve train components, maintaining their correct position relative to the cylinder head,
• creates a working space for lubricating the upper part of the engine,
• serves as a base for mounting selected accessories and lines in the engine bay.

By maintaining the factory design, the cover is matched to the characteristics of the high-revving 320 si unit, which promotes stable timing system operation and maintains proper oil pressure in the upper part of the engine.

Compatibility and fitment for BMW E90 320 si

The offered valve cover has been designed specifically for the N45 unit in the BMW 3 Series E90 320 si model. This means:

• compatibility with the N45 cylinder head geometry,
• proper placement of mounting points,
• fitment to the factory sealing and oil routing system,
• consistency with the original oil vapor discharge system.

Such fitment translates into installation without modifications, while maintaining factory tolerances and engine operating parameters.

Characteristics of the used component

The valve cover is a used component, which in practice means it has been dismantled and was previously operated in a vehicle. This type of OEM part is particularly attractive to users who:

• want to maintain the original BMW engine specification,
• are looking for a cost-effective solution while maintaining factory fitment,
• avoid aftermarket replacements with uncertain geometry and build quality.

Before installation, a standard service procedure is recommended, including checking the mating surfaces, replacing the gasket, and verifying correct mounting according to BMW technical documentation.

Benefits of using an original valve cover

Using an original valve cover in the BMW E90 320 si N45 allows for maintaining the structural integrity of the engine. The most important advantages include:

• factory fitment to the cylinder head and valve train,
• preservation of the oil channels and working spaces intended by the manufacturer,
• reduced risk of leaks resulting from imprecise fitment,
• compatibility with original engine accessories.

For users who care about technical correctness of repairs and long-term operation of the N45 unit, choosing an original valve cover is a solution consistent with the manufacturer's design intent.

Expanding knowledge and selecting parts

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as housings, mounts, or additional accessories, check out the available parts in the Other BMW category.

To compare design solutions used in sports engines and braking systems, it is worth reading an article discussing the differences between standard and sports versions – they are described in detail in the post Audi RS vs other models – what is hidden under the hood and chassis?, which allows for a better understanding of manufacturers' approaches to designing engines and high-performance components.