Crankshaft Housing Mercedes W203 A209 W211 Rear Oil Seal Cover A1120110108

Crankshaft Housing Mercedes W203 A209 W211 Rear Oil Seal Cover is a precision component from the Timing chain and belt covers group, designed for installation at the rear of the engine unit. It is responsible for tightly securing the rear section of the crankshaft and the timing zone, which promotes stable engine operation and reduces the risk of leaks. This is a practical solution for Mercedes users looking for a proven, original component for professional repairs.

Specifications and technical data

• SKU: A1120110108
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120110108
• Substitutable numbers: A1120110108, A 112 011 01 08
• Location on the vehicle: Rear
• Category: Timing Covers

Purpose and technical function

The crankshaft housing cover in Mercedes W203, A209, and W211 models plays a key role in protecting the rear part of the engine. This component seals the area around the crankshaft and its associated sub-assemblies, stabilizing the operating conditions of the lubrication and timing systems. Thanks to its specific shape and fitment to the engine block, it ensures control over oil flow in this zone and helps maintain proper system tightness.

Its location in the rear part of the engine unit means the cover is significant both for mechanical protection and for limiting the ingress of contaminants into the engine. A properly selected cover allows for the restoration of factory operating conditions, which is essential during overhauls, seal replacements, or comprehensive timing system maintenance.

Benefits of using an original Mercedes cover

Using an original crankshaft housing cover dedicated to specific Mercedes generations translates into a number of practical benefits:

• precise fit to the engine block and the rear part of the crankshaft,
• preservation of the factory geometry of the timing zone,
• reduced risk of leaks in the rear crankshaft seal area,
• stable operating conditions for the lubrication system in the rear of the engine.

For workshops and private users, this means easier installation, predictable behavior after engine assembly, and the ability to carry out repairs according to the manufacturer's specifications. Original fitment minimizes the need for additional modifications or adjustments during installation.

Installation characteristics and application

The cover has been designed for installation at the rear of the engine in selected Mercedes C-Class (W203), CLK (A209), and E-Class (W211) models. Its placement on the vehicle in the rear engine zone requires precise alignment with the block and adjacent components, which is why choosing a dedicated cover is important during any major intervention in the timing system or when replacing crankshaft seals.

The product comes from the Timing chain and belt covers group, meaning it is intended for operation in the immediate vicinity of components responsible for the timing drive. A proper cover helps maintain cleanliness and appropriate operating conditions in this zone, which is important for the durability of the chain or belt and the associated gears.

Condition and service application

The item is offered as a used part, which is a reasonable choice for servicing older generations of Mercedes, where both technical compatibility and repair economy are important. For workshops specializing in the Mercedes brand, this is a practical solution that allows for the restoration of the factory engine configuration without the need to resort to replacements with uncertain fitment.

The cover will prove particularly useful during:

• overhauling the rear part of the engine,
• replacing crankshaft seals,
• servicing or upgrading the timing zone,
• comprehensive regeneration of the engine unit in W203, A209, and W211 models.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional covers, shields, or housings working with the timing system, check out the available parts in the Mercedes timing chain and belt covers category.

If you want to expand your knowledge on the safe selection of used components and are interested in how to assess the technical condition of key sub-assemblies, check out the guide Second-hand braking system: how to safely choose discs, calipers, and ABS?, which shows universal principles that are also useful when choosing other used parts.