BMW 1 3 Series E87 E90 E91 M47N2 Engine Crank Timing Case Cover Bottom 7790427

BMW 1 3 Series E87 E90 E91 M47N2 Engine Crank Timing Case Cover Bottom is an original BMW component, designed for the M47N2 diesel engine family used in the E87, E90, and E91 series. The cover is responsible for tightly sealing the timing mechanism, providing stable support for auxiliary components, and maintaining proper operating conditions in the front section of the power unit. It is a practical solution for users seeking factory fitment and predictable installation parameters.

Specifications and technical data

• SKU: 7794136
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7790427
• Substitutable numbers: 11147794136, 7794136, 7790427
• Category: Other Engine Parts

Purpose and function of the timing case cover

The timing case cover in the M47N2 engine performs several key structural tasks. It is responsible for the mechanical protection of timing components against external contaminants, stabilizes the system's operation in the front of the engine, and contributes to the oil circulation in this area. In BMW 1 Series E87 and 3 Series E90 and E91 models, a correctly selected cover is important for:

• maintaining the tightness of the front part of the power unit,
• reducing oil leaks in the timing area,
• proper positioning of cooperating sub-assemblies,
• preserving the factory geometry of the accessory drive system.

Original origin and installation compatibility

The presented timing case cover is a BMW OE group component, which means factory-standard fitment for M47N2 units used in E87, E90, and E91 bodies. The original design ensures:

• preservation of the mounting points specified by the manufacturer,
• compatibility with factory seals and associated components,
• consistency with the standard lubrication system and timing layout.

As a result, the cover can be used both for routine repairs and for comprehensive rebuilding of the front part of the engine, without the need for structural modifications.

Characteristics of the used component

The timing case cover comes from the secondary market, which allows for cost-effective restoration of the power unit's efficiency while maintaining the original specification. A used component of this type is particularly useful in situations where:

• mechanical damage or cracking of the existing cover has occurred,
• there are issues with maintaining tightness in the front part of the engine,
• it is necessary to replace the component with a factory-compliant one, without interfering with the block structure.

Choosing an original, used timing case cover allows you to maintain consistency with the factory design of the power unit and reduce the risk of installation problems typical of aftermarket replacements of uncertain origin.

Application in service and engine area modernization

The timing case cover for the M47N2 engine in BMW E87, E90, and E91 is a component often included in major engine service work – especially when replacing the timing, seals, or during post-collision repairs. In workshop practice, it is used, among other things, for:

• overhauling the front part of the power unit,
• eliminating leaks in the timing area,
• restoring the factory layout of engine accessory mounts.

Selecting an original cover allows for maintaining predictable operating parameters and facilitates the diagnosis of potential future faults, as the system remains compliant with the manufacturer's documentation.

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

Technical support and knowledge about drive systems

When selecting components for diesel engines, such as the timing case cover for the M47N2 unit, it is worth using reliable sources of knowledge regarding the construction and structural differences between individual model versions. For a better understanding of how manufacturers differentiate power units, braking systems, and chassis in standard and sports versions, an article comparing sports variants with standard versions may be helpful – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?.