Crankshaft Mercedes W245 W169 Diesel Engine OM640 Crankshaft A6400300901

The Mercedes W245 W169 Diesel OM640 Crankshaft is an original part from the Crankshafts group, designed for OM640 diesel engines in A-Class and B-Class models. A used crankshaft of this type allows for a technically correct diesel engine rebuild while maintaining factory operating characteristics. This is a solution for users who expect a solid foundation for professional repair of the engine's lower section.

Specifications and technical data

• SKU: A6400300901
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400300901
• Substitutable numbers: A6400300901, A 640 030 09 01
• Fuel type: Diesel
• Category: Crankshafts

Application and Compatibility with OM640 Engine

The presented crankshaft is intended for Diesel OM640 engines used in Mercedes A-Class (W169) and B-Class (W245) models. By maintaining the factory geometry and mass distribution, it provides a proper basis for engine overhaul, where correct balancing parameters and cooperation with connecting rods and main bearings are crucial.

The selection of the correct crankshaft directly impacts engine running smoothness, torsional vibration levels, and the durability of the entire crankshaft-piston assembly. For diesel engines like the OM640, this is particularly important due to higher mechanical loads and combustion pressures.

Technical Characteristics of the Crankshaft

The crankshaft from this series was designed by Mercedes for stable operation under the wide range of loads typical for diesel engines. The construction ensures adequate rigidity, and the arrangement of main and connecting rod journals is optimized for even force distribution within the engine block.

In practice, this means:

• correct cooperation with the engine lubrication system,
• the possibility of maintaining factory assembly clearances after appropriate selection of bearings,
• stable operation under prolonged load characteristic of diesel engines,
• preservation of the correct geometry of the crankshaft-piston assembly after proper installation.

Benefits of Using an Original Crankshaft

Choosing an original crankshaft for a Mercedes A-Class and B-Class with a diesel engine allows for maintaining the structural integrity of the entire powertrain. Factory fitment to the OM640 block minimizes the risk of issues with alignment, improper balancing, or excessive bearing wear shortly after overhaul.

A used part from this group is a good solution when the existing crankshaft has suffered mechanical damage, exhibits excessive journal wear, or is not suitable for further machining. A correctly selected crankshaft allows for restoring proper engine operating parameters without the need to interfere with other components, provided they are within acceptable tolerances.

Professional Installation and Service Recommendations

To fully utilize the potential of this crankshaft, installation in a specialized service center equipped with appropriate measuring tools is recommended. It is crucial to check the condition of the block, the alignment of the main bearing seats, and to select the correct bearings according to the manufacturer's technical documentation.

During installation, pay attention to:

• thorough cleaning of oil passages in the block and crankshaft,
• checking clearances on main and connecting rod journals,
• correct sequence and torque of main bearing cap bolts,
• checking radial and axial runout of the crankshaft after installation.

Expanding the Crankshaft Assembly in a Mercedes

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 additional shafts, components cooperating with the shaft, or complementary crankshaft assembly components, check the available parts in the Mercedes Crankshafts category.

For drivers interested in a broader approach to vehicle component servicing, practical advice on operating and replacing engine accessory components may be useful – you can find it in the article When is it Worth Replacing an Alternator with a Used One: A Practical Guide for Drivers, which helps to better plan car service work.