

We hope you find the Mercedes-Benz Belt Tensioner Replacement Guide helpful.

Replacing the drive belt tensioner on the Mercedes-Benz engine is relatively easy. When this happens, you normally hear noise from the front of the engine. The tensioner pulley bearing may also fail. The drive belt will come off the various pulleys, possibly causing damage. If not replaced on time, it can fail while the engine is running. Over time the tensioner pulley can start to crack. Start the engine and ensure the belt and tensioner are working properly.Put pressure on the tensioner’s 17mm head to move the tensioner up and remove the locking pin.If the belt does not reach, ensure it is not sitting on top of one of the pulleys. Make sure it is routed on all the pulleys properly. Typical torque for the tensioner bolts ranges between 25Nm to 35 Nm. Torque the tensioner bolts to the recommended manufacturer specifications.Start threading the tensioner bolts by hand until a few threads have gone in.
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Use a 17mm socket to move the tensioner up (service) position.Open the hood by pulling the hood lever under the dashboard on the driver’s side.Park, the Mercedes-Benz, set the parking brakes and allow the engine to cool down.It is ok to reuse the old belt if it does not show wear, cracking, degradation, or drying. While it is not required to replace the drive belt, it makes sense to replace it simultaneously as the tensioner.
