Mercedes W167 OM654 Diesel Belt Tensioner Pulley A6542002600

Mercedes W167 OM654 Diesel Belt Tensioner Pulley is an original component from the Tensioners and pulleys group, designed for accessory drive systems in OM654 diesel engines. This used OEM part ensures factory-spec belt routing geometry, stable accessory operation, and predictable drive performance during daily use. It is a solution for users seeking a proven component with a design tailored to the specifics of diesel units in the W167 model.

Specifications and technical data

• SKU: A6542002600
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6542002600
• Substitutable numbers: A6542002600, A 654 200 26 00
• Fuel type: Diesel
• Category: Tensioners & Pulleys

Purpose and function in the accessory drive system

The belt tensioner pulley in the OM654 engine is responsible for maintaining the correct tension of the multi-ribbed belt and ensuring its stable path across the pulleys. In Diesel units, this is particularly important due to higher dynamic loads and engine operating characteristics. A properly selected tensioner reduces the risk of:

• belt slippage on pulleys during sudden load changes,
• excessive vibrations transmitted to the alternator, pump, and other accessories,
• accelerated wear of the belt and cooperating components.

By maintaining factory design parameters, this element helps keep the accessory drive system running stably in a Mercedes W167 with a diesel engine.

Benefits of using an original tensioner with pulley

Using an original belt tensioner with pulley in an OM654 unit translates into a number of practical operational benefits. The most important include:

• Factory fit for the accessory drive system – the correct position of the pulley relative to other pulleys is maintained, which facilitates installation and minimizes the risk of misalignment.
• Stable operation within typical diesel engine load ranges – the design is adapted to the torque characteristics of the OM654 unit.
• The ability to use the existing accessory configuration without the need for system modifications.

A used OEM component is a sensible choice for drivers who want to maintain the original performance characteristics of the accessory drive while optimizing service costs.

Component condition and installation aspects

The offered belt tensioner with pulley is in used condition, meaning it has been removed from a vehicle and is intended for further use after proper installation. Before installation, a standard workshop procedure is recommended, including checking the pulley track, the freedom of movement of the tensioning mechanism, and assessing the condition of the drive belt in the vehicle.

When replacing, it is worth paying attention to:

• correct belt routing over all pulleys,
• tightening torque of fasteners in accordance with service documentation,
• checking the tensioner's operation after the first engine start.

This approach allows you to fully utilize the potential of the part and reduce the risk of improper accessory drive system operation.

Tensioners and pulleys for Mercedes – system expansion and service

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 additional idler pulleys, auxiliary tensioners, or belt guides, check the available parts in the Mercedes Tensioners and pulleys category.

Technical knowledge and selection of used parts

When selecting a used belt tensioner with pulley for an OM654 engine, it is worth being guided not only by compatibility with the power unit but also by the general condition of the charging and accessory system. In case of doubts regarding alternator operation, a practical guide for drivers may be helpful – detailed information can be found in the article When is it worth replacing an alternator with a used one: a practical guide for drivers.

If you are interested in the broader context of using OEM components in premium cars, it is also worth reading the analysis of market trends in the material Crisis in the new parts market? Why in 2026 used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend, which shows why a conscious choice of used elements can be technically and economically justified.