Mercedes A209 Rear Crankshaft Oil Seal Housing Cover A1120110208

Mercedes A209 Rear Crankshaft Oil Seal Housing Cover is an original component designed for the rear section of the drivetrain in Mercedes vehicles. It ensures a tight and stable seal for the crankshaft, which is essential for maintaining proper engine operating conditions and protection against contaminants. Using this OEM component is a sensible choice for maintenance when you prioritize factory geometry and fitment without the need for unnecessary modifications.

Specifications and technical data

• SKU: A1120110208
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120110208
• Substitutable numbers: A1120110208, A 112 011 02 08
• Location on the vehicle: Rear
• Category: Other Engine Parts

Purpose and technical function

The cover acts as a seal for the rear part of the engine crankshaft, operating in an area exposed to variable mechanical loads and external factors. Its functions include:

• maintaining proper sealing in the rear zone of the engine unit,
• protecting rotating components from external dirt and debris,
• providing a stable closure of the housing in the crankshaft area, in accordance with the original Mercedes design.

Thanks to the preservation of the original mounting geometry, the cover works with adjacent components without the need for adjustments or modifications, which facilitates service work.

Vehicle placement and installation aspects

The element is designed for installation in the rear part of the powertrain, which requires precise alignment with the crankshaft and adjacent components. The rear placement means the cover operates in an area with limited access, so it is particularly important to:

• maintain factory mounting points,
• ensure correct positioning of seals and contact surfaces,
• check surface cleanliness before installation to avoid leaks.

The original Mercedes crankshaft housing allows for OEM-standard service, which translates into predictable system performance after assembly.

Characteristics of the used OEM component

As a pre-owned part, the cover represents a balance between repair costs and maintaining factory design parameters. A used OEM component is a good solution when:

• you want to maintain the original technical specifications of the engine,
• you care about compatibility with factory bolts, seals, and accessories,
• you are looking for a part with a proven design, compliant with the manufacturer's documentation.

Choosing the original crankshaft housing reduces the risk of fitment issues that may occur with aftermarket replacements having different geometry.

Selection support and service expansion

When selecting this cover, it is worth verifying compatibility with the specific engine version and vehicle model year using the manufacturer's markings and catalog data. This will help you avoid situations where an element with a similar shape does not work correctly with your engine unit. In the case of extensive drivetrain service, it is a good solution to simultaneously check seals, bearings, and other components of the rear engine section to reduce the number of service downtimes in the future.

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

Technical knowledge and project development

When working on the drivetrain, it is worth expanding your knowledge about solutions used by various manufacturers to better understand design differences and approaches to component durability. High-performance units with increased power, where crankshaft and cover loads are particularly high, are a good point of reference. In this context, an article discussing the differences between standard and sports versions may be helpful, available at the link: Audi RS vs other models – what is hidden under the hood and chassis?.