Mercedes W169 W245 Diesel OM640 Piston Connecting Rod is an original component of the crankshaft-piston system designed for OM640 diesel engines in A-Class and B-Class models. Thanks to its factory geometry and compatibility with Diesel units, it ensures proper cooperation with the crankshaft, piston pin, and cylinder. This is a practical solution for professional engine repairs or overhauls in Mercedes vehicles of this series.
Specifications and technical data
- SKU: A6400300517
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A6400300517
- Substitutable numbers: A6400300517, A 640 030 05 17, A6400300320, A 640 030 03 20, KZ
- Fuel type: Diesel
- Category: Other Engine Parts
Intended Use and Compatibility with OM640 Engine
The presented piston with connecting rod is structurally adapted to the OM640 engine units used in Mercedes A-Class (W169) and B-Class (W245) powered by diesel fuel. The use of the correct piston-connecting rod set is crucial for:
- maintaining the correct compression ratio in the diesel engine,
- stable operation of the crankshaft-piston system across the entire RPM range,
- even transfer of combustion forces to the crankshaft.
By maintaining factory dimensions and shape, this component allows for the preservation of the typical operating characteristics of OM640 engines, without the need for modifications to other sub-assemblies.
Technical and Constructional Characteristics
The piston with connecting rod in this offer belongs to the Other category, but in practice, it is a key mechanical engine component. The set's design has been developed for operation in a Diesel engine, which means resistance to high combustion pressures and fatigue loads. The correct selection of material and machining technology ensures:
- dimensional stability at high operating temperatures,
- appropriate connecting rod stiffness under dynamic load changes,
- proper cooperation with bearings and the piston pin.
A set configured in this way allows for the preservation of the engine unit's factory operating parameters, which is particularly important in direct injection engines.
Application in Mercedes Engine Repairs and Overhauls
The used piston with connecting rod for Mercedes W169/W245 is suitable for:
- local repairs of a single cylinder after mechanical damage,
- partial overhauls of the OM640 unit,
- restoring engine efficiency after seizure or overheating.
Using an original component from the same engine family facilitates adherence to factory assembly tolerances and operating parameters. This is a practical solution for workshops specializing in the service of Mercedes A-Class and B-Class vehicles with diesel engines.
Benefits of Choosing an Original Mercedes Component
By choosing this piston with connecting rod, you gain primarily factory fit for the OM640 unit, which reduces the risk of crankshaft balancing issues or incorrect operating clearances. Original origin translates to:
- consistency with other engine components (crankshaft, bearings, pin, rings),
- easier identification in service catalogs,
- the possibility of using standard assembly procedures recommended by the manufacturer.
This is particularly important in repairs where repeatability and predictability of the final result after engine assembly are crucial.
Component Condition and Installation Recommendations
The component is a used part and is intended for reinstallation after standard workshop verification. Before installation, it is recommended to:
- check clearances on the piston pin and connecting rod journals,
- inspect surfaces cooperating with the cylinder and rings,
- select appropriate piston rings and bearings according to service documentation.
Professional installation, adhering to tightening torques and manufacturer procedures, will allow for the full utilization of this component's potential in a Mercedes diesel engine.
If you are looking for other components in 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.
To compare the characteristics of sports engine units with standard diesel constructions, it is worth familiarizing yourself with the analysis of gasoline engines and their components in the blog article Audi RS vs. Other Models – What Lies Under the Hood and Chassis?, which shows the differences in the construction and loads of key sub-assemblies.
