Cylinder Head Cover BMW E90 E92 E93 M3 S65 Cylinder 5-8 7838268

Cylinder Head Cover BMW E90 E92 E93 M3 S65 Cylinder 5-8 is an original component from the Tappet and valve covers group, designed for the S65 engine in BMW 3 Series sports models. This used cover provides a functional solution for workshops and users looking for a factory component with the correct geometry and fitment for cylinders 5–8.

Specifications and technical data

• SKU: 7848154
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2303727
• Substitutable numbers: 2303727, 11002303727, 0443640, 11000443640, 0443642, 11000443642
• Category: Rocker & Valve Covers

Purpose and technical function

The valve cover for cylinders 5–8 in the S65 engine is responsible for tightly sealing the upper part of the cylinder head and ensuring stable guidance for components in the tappet and valve group. A correctly selected component helps maintain proper pressure in the timing chamber, limits oil vapor blow-by, and provides adequate mechanical protection for the operating components.

Thanks to its design in accordance with the BMW factory standard, the cover retains the correct mounting points, vapor routing channels, and a shape tailored to the characteristic V8 layout of the S65 unit, which facilitates installation and subsequent maintenance.

Benefits of using an original valve cover

Using an original valve cover in the S65 engine allows for maintaining the structural integrity of the entire timing system. In practice, this means:

• secure fitment to the cylinder head on the cylinder 5–8 side,
• stable sealing of the workspace above the tappets and valves,
• preservation of factory geometry for the cover gasket,
• easier inspection of potential leaks and maintenance.

For high-revving engines such as the S65, the correct valve cover is important for maintaining uniform operation of the lubrication system and proper discharge of oil vapors, which translates into stable performance parameters.

Product characteristics and condition

The offered cover comes from the BMW line and is a component intended for installation in the S65 engine in E90, E92, and E93 M3 models. The product is in used condition, making it an attractive cost-effective solution while maintaining factory design specifications. This type of component is particularly useful for repairs after mechanical damage, replacing a leaking cover, or completing an engine after an overhaul.

Thanks to the preservation of the original form and mounting points, the cover can be integrated into the existing system without the need for cylinder head modifications or additional alterations, which reduces workshop time and limits the risk of installation errors.

Application in service and modernization projects

The valve cover for cylinders 5–8 in the S65 engine will work well both in standard maintenance repairs and in more advanced projects, such as rebuilding the engine after a failure or preparing a car for intensive track use. A used OEM component allows for maintaining consistency with other engine parts, which is crucial for precision units with high specific power.

If you are planning a comprehensive repair or modernization of the engine area in your BMW and need other elements from the same group, such as additional covers, seals, or tappet covers, check the available parts in the BMW Tappet and valve covers category.

Additional information and technical support

Before purchasing, it is worth comparing the markings with your existing valve cover and verifying compatibility with the specific version of the S65 engine in your BMW M3 to ensure trouble-free installation. For extensive projects, such as engine modifications or building a track car, materials regarding the optimal selection of used components may also be helpful.

If you are considering a wider range of modifications and want to effectively use used components while maintaining safety and reliability, check out the article Tuning with used parts – how to gain performance without spending a fortune, which discusses a practical approach to such projects.