BMW E90 320si Petrol N45B20A Engine Bracket Camshaft Cylinder Head 7551981

BMW E90 320si Petrol N45B20A Engine Bracket Camshaft Cylinder Head is an original component from the Cylinder Heads category, designed for the petrol engine unit. The precise mounting geometry ensures stable support for the camshaft, which translates into correct timing operation and even load distribution on the cylinder head. This used OEM component is a sensible choice for specialized engine repairs where structural fit and compliance with factory BMW solutions are essential.

Specifications and technical data

• SKU: 7557932-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7551981
• Substitutable numbers: 11127557932, 7557932, 7551981, ŁS
• Fuel type: Petrol
• Category: Cylinder Heads & Valve Covers

Purpose and function in the BMW N45B20A engine

The offered bracket operates within the cylinder head of the petrol unit, where it is responsible for stable camshaft guidance and maintaining proper alignment relative to the bearing journals. A correctly selected component of this type is crucial for:

• maintaining the proper operating clearance of the camshaft,
• reducing vibration and noise in the upper part of the engine,
• even distribution of loads on the sliding surfaces of the cylinder head,
• maintaining correct timing synchronization in the petrol engine.

Thanks to the use of original mounting geometry, the bracket works with the factory BMW E90 320si cylinder head, which facilitates installation and reduces the risk of camshaft alignment issues.

Benefits of using an original cylinder head bracket

In the case of specialized units, such as the N45B20A petrol engine, using an original component from the Cylinder Heads group allows for maintaining the operating parameters specified by the manufacturer. The bracket ensures:

• factory fit for oil channels and mating surfaces,
• compliance with the tightening torques specified for the cylinder head,
• consistency with other timing system components.

The used OEM element is also a cost-effective solution while maintaining high manufacturing quality, which is important when repairing high-performance petrol units.

Condition, verification, and preparation for installation

The bracket comes from disassembly and is offered as a used part, which allows for an economical repair without sacrificing the original BMW specification. Before installation, a standard preparatory procedure is recommended:

• thorough cleaning of the contact surfaces with the cylinder head and camshaft,
• visual inspection for any signs of excessive wear,
• checking the mounting bolt sockets and the flatness of the mating surfaces.

An element prepared in this way allows for seamless integration with the existing cylinder head, while maintaining proper lubrication and camshaft guidance.

Application in repairs and upgrades of the petrol unit

The BMW E90 320si engine camshaft cylinder head bracket will prove useful both for local repairs of the upper part of the engine and for a comprehensive rebuild of the petrol unit. It can be used, among others, for:

• replacing a damaged cylinder head or its supporting elements,
• regenerating the timing system after a lubrication failure,
• cylinder head inspection after modifications or intensive track use.

Thanks to the preservation of the original design, the bracket helps maintain stable operating conditions for the camshaft, which has a direct impact on the petrol engine's performance and refinement.

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 housings, valve covers, or additional mounting elements, check the available parts in the BMW Cylinder Heads category.

If you are also considering work on the drivetrain and want to better understand when it is worth choosing used OEM components instead of uncertain replacements, the article Humming differential? Find out why a used OEM drive axle is a better investment than an uncertain replacement, which shows a practical approach to selecting original used parts, will be helpful.