Mercedes W169 W245 Petrol M266.940 Engine Connecting Rod Piston Conrod

Mercedes W169 W245 Petrol M266.940 Engine Connecting Rod Piston Conrod is an original crankshaft-piston system component designed for M266.940 series petrol engines. This used OEM part ensures a proper fit for the power unit while maintaining factory performance parameters. It is a solution for users who want to technically restore engine efficiency without interfering with its original design.

Specifications and technical data

• SKU: A2660300520
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2660300520
• Substitutable numbers: A2660300520, A 266 030 05 20, A2660300917, A 266 030 09 17
• Fuel type: Petrol
• Category: Other Engine Parts

Purpose and function in a petrol engine

The piston with connecting rod in the M266.940 petrol engine is responsible for transferring combustion forces to the crankshaft, thereby generating torque. A correctly selected component from this group allows for maintaining the proper geometry of the crankshaft system, minimizing vibrations and loads on cooperating sub-assemblies. Using a component dedicated to a specific power unit is crucial for maintaining uniform operation across all cylinders.

Benefits of using an original component

Choosing an original piston with connecting rod for a Mercedes W169/W245 primarily means dimensional and material compliance with factory specifications. As a result:

• proper cylinder compression is maintained,
• correct cooperation with the crankshaft and piston pin is preserved,
• the risk of improper crankshaft system balancing is reduced,
• the probability of premature wear of bearings and bushings is decreased.

A used OEM component is a compromise between cost and maintaining the factory engine operating characteristics, which is particularly important when repairing petrol units used on a daily basis.

Selection and compatibility with the M266.940 unit

The presented piston with connecting rod has been designed to work with the M266.940 petrol engine used in Mercedes W169 and W245 models. Proper selection of a component from this group helps avoid assembly issues and limits the risk of improper power unit operation after reassembly. The product has an assigned OEM part number and associated interchangeable numbers, which facilitates compatibility verification in service catalogs and parts selection systems.

Application in the engine repair process

The piston with connecting rod is used both for local repair of a single cylinder and for broader power unit regeneration. In workshop practice, this type of component is used, among other things, for:

• mechanical damage to the piston or connecting rod,
• excessive wear of working surfaces,
• the need to restore proper cylinder compression,
• petrol engine overhauls following failures related to overheating or detonation.

Using a dedicated component allows for maintaining the structural integrity of the power unit, which is significant for the durability and stability of the engine after repair.

Brand and build quality

The component comes from the Mercedes brand offer, which means it was designed with specific models and power units from the manufacturer in mind. As a result, the user receives a part with parameters consistent with service documentation, rather than a universal replacement. The used component retains the design features intended by the vehicle manufacturer, which is essential for repairs carried out in accordance with service technology.

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 the crankshaft, cylinder head, or engine block, check the available parts in the Other Mercedes category.

Technical support and knowledge about performance units

When planning a repair or modification of a power unit, it is worth expanding your knowledge about the structural differences between standard and high-load engines. These issues are well illustrated by high-output units, where the crankshaft-piston system operates under much more demanding conditions. You can find more on this topic in the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the specifics of engines, brakes, and chassis in high-performance versions.