BMW 1 3 Series E87 E90 E91 118d 318d 120d 320d M47N2 Engine Cylinder Head Cover

BMW 1 3 Series E87 E90 E91 118d 318d 120d 320d M47N2 Engine Cylinder Head Cover is an original BMW component, designed for use in popular diesel units used in the 1 and 3 Series. The cover performs an important protective and sealing function within the cylinder head, contributing to stable engine operation and a tidy engine bay.

Specifications and technical data

• SKU: 7807998
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7807998
• Substitutable numbers: 11127807998, 7807998, 11127799222, 11124720930, 7799222, 4720930, 13712246997, 2246997
• Category: Other Engine Parts

Purpose and function of the cylinder head cover

The cylinder head cover in BMW E87, E90, and E91 models with 118d, 318d, and 120d engines is responsible for isolating the timing mechanisms and the upper part of the cylinder head from external contaminants. At the same time, it works in conjunction with the crankcase ventilation system, which is crucial for proper gas circulation and maintaining correct engine pressure. A properly selected cover helps reduce oil leaks and engine noise.

Advantages of using an original BMW cover

Using an original cylinder head cover dedicated to specific BMW models ensures:

• Precise fit to the cylinder head and engine accessories without the need for modifications.
• Compatibility with factory mounting systems, seals, and hoses.
• Stable operating conditions for timing components due to the appropriate structural rigidity.
• An aesthetic and organized engine bay appearance after installation.

For users servicing 118d, 318d, and 120d units, this means easier installation, predictable component behavior, and a reduced risk of leaks resulting from imprecise fitment.

Condition of the component and installation aspects

The offered cylinder head cover is a used original part, which in practice means it retains the factory geometry and mounting points characteristic of BMW solutions. Before installation, it is recommended to perform a standard inspection of the mating surfaces, bolt seats, and connection ports, as well as to use a new gasket compatible with the specific engine unit. Proper tightening of the bolts according to the manufacturer's service procedure ensures the tightness and durability of the connection.

Part selection by numbers and integration with other components

The cylinder head cover works with many engine accessories, such as vacuum lines, the ventilation system, or mounts for additional components. Therefore, when selecting, it is worth paying attention to compatibility with the OEM part number and available interchangeable numbers, which facilitates the identification of the correct variant for a specific engine version. This helps avoid installation problems and ensures proper integration with the existing engine configuration.

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 covers, mounts, or engine bay trim components, check out the available parts in the Other BMW category.

Technical support and project development

For more extensive service or modernization projects, it is worth expanding your knowledge about the structural differences between sports and standard versions of engine units and associated systems. A material comparing solutions used in more powerful variants, such as the RS, versus standard versions may be helpful – you can find it in the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, differences in engines, brakes, and chassis.