Piston Conrod Mercedes W203 A209 W211 M112 Engine Connecting Rod A1120306617

Mercedes W203 A209 W211 M112 Piston and Connecting Rod is an original part from the Pistons and Rings group, designed for M112 gasoline engines used in Mercedes C-Class W203, CLK A209, and E-Class W211 models. This is a solution for users who want to restore the proper operation of the engine unit while maintaining its factory characteristics and smooth running.

Specifications and technical data

• SKU: A1120306617
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120306617
• Substitutable numbers: A1120306617, A 112 030 66 17
• Fuel type: Petrol
• Category: Pistons & Rings

Purpose and Function in the M112 Engine

The piston-connecting rod assembly in the M112 gasoline engine is responsible for precisely transferring combustion forces to the crankshaft, thus efficiently converting the chemical energy of fuel into torque. Using an original component allows for maintaining correct cylinder operating parameters, reducing vibrations, and preserving the power and flexibility characteristics intended by the manufacturer.

This element is particularly important for engine unit overhauls where high dimensional repeatability and compliance with factory tolerances are required. This enables stable compression, proper operation of the piston-connecting rod system, and predictable wear of cooperating surfaces.

Benefits of Using an Original Piston with Connecting Rod

Using an original piston with a connecting rod in the M112 gasoline engine offers a range of practical service and operational benefits:

• maintaining the factory geometry of the piston-connecting rod system,
• material consistency with other engine components,
• easier diagnostics and predictable unit behavior after overhaul,
• reduced risk of improper fit compared to aftermarket parts of uncertain specifications.

For workshops specializing in Mercedes service, this means a more predictable repair process, and for the user – greater confidence in the durability of the overhauled engine.

Component Condition and Practical Service Application

The offered piston with connecting rod is a used part, removed from a vehicle, and intended for reuse in M112 gasoline engines. Such components are often used in overhauls of engine units in vehicles from model years where new factory parts are difficult to obtain or economically unjustified. In practice, this allows for restoring engine functionality while maintaining the original design specifications.

This solution is suitable for both standard operational repairs and restoration projects where compliance with factory technology and the possibility of further, trouble-free service are important.

Support for Youngtimer Restoration

M112 gasoline engines are commonly found in Mercedes vehicles from the late 90s and early 2000s, which are increasingly treated as youngtimers. In such projects, used, original piston-connecting rod system components represent a sensible compromise between cost and preserving the car's character. If you want to better plan the restoration of your Mercedes or other models from this era, it's worth checking out the guide: Second Life for a Youngtimer – How Used Car Parts Revitalize Cars from 1998–2012.

Mercedes Pistons and Rings – System Expansion and Modernization

If you are planning a comprehensive repair or modernization of the engine area in your Mercedes and need other parts from the same group, such as pistons, rings, or cooperating components, check the available parts in the Mercedes Pistons and Rings category.