Mercedes-Benz A B W169 W245 Petrol M266 Engine Connecting Rod Piston Conrod

Mercedes A B Class W169 W245 M266 Piston with Connecting Rod is an original component of the crankshaft-piston system designed for M266 series gasoline engines in A and B Class models. The used OEM part ensures proper force transfer within the cylinder and stable cooperation with the crankshaft, which is crucial for the engine's operating characteristics. This is a solution for users who want to restore engine functionality in a technically correct and economical way.

Specifications and technical data

• SKU: A2660300420
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2660300420
• Substitutable numbers: A2660300420, A 266 030 04 20, A2660300817, A 266 030 08 17, KZ
• Fuel type: Petrol
• Category: Other Engine Parts

Intended Use and Compatibility with M266 Engine

The presented piston with connecting rod is dedicated to gasoline units used in Mercedes A Class W169 and B Class W245 from the M266 series. The use of the correct crankshaft-piston system component is essential for:

• maintaining proper cylinder compression,
• stable piston operation within the cylinder bore,
• safe transfer of loads to the crankshaft.

By preserving the original geometry and mass of the component, it is possible to reduce vibrations and ensure uniform operation of the entire crankshaft-piston assembly in the gasoline engine.

Technical Characteristics of the Piston-Connecting Rod System

The piston-connecting rod system in the M266 engine is responsible for converting reciprocating motion into rotational motion. A properly selected component ensures:

• adequate connecting rod stiffness under high dynamic loads,
• correct piston guidance within the cylinder,
• maintenance of factory assembly clearances on the gudgeon pin and crankshaft journal sides.

In practice, this translates to smooth engine operation, reduced mechanical noise, and proper interaction with the ignition and fuel supply systems.

Application in Engine Service and Overhaul

Replacing a single piston with a connecting rod is often part of a broader engine overhaul. This component is suitable for situations where it is necessary to:

• remedy the effects of seized or overheated cylinders,
• restore uniform engine operation after mechanical damage,
• replace a missing component during a professional engine overhaul.

Selecting an original component for a specific M266 engine series minimizes the risk of crankshaft balancing issues, excessive vibrations, or reduced durability of other crankshaft-piston system components.

Category, Brand, and Fitment in the Offer

The product belongs to the Other category, allowing for flexible use in various service projects related to Mercedes gasoline engines. Manufacturer markings and available interchange numbers enable precise component matching to specific engine versions and vehicle model years, which is particularly important when working with M266 units.

If you need other components from the Other category dedicated to this brand, check our offer at Other Mercedes, where you will find a wide selection of components for various models.

Technical Knowledge and Project Development

When planning an engine repair or upgrade, it is advisable to expand your knowledge about the design differences between various engine series and sport versions. An article comparing solutions used in high-performance variants and standard units can be helpful – you can find it here: Audi RS vs. Other Models – What Lies Under the Hood and Chassis?. This will help you better understand how the selection of appropriate components affects the durability and performance characteristics of the drivetrain, which can also be applied to servicing Mercedes engines.