Car Fan Belt Adjuster E Class Fan Belt Tensioner - Color: Black

The fan belt tensioner (or serpentine belt tensioner) in an E-Class Mercedes-Benz is a crucial component of the engine's belt system. It keeps the serpentine belt under the proper tension, ensuring that the belt drives various engine accessories like the alternator, power steering pump, water pump, and air conditioning compressor.

Symptoms of a Failing Fan Belt Tensioner
Squealing or Chirping Noise: A loose or failing tensioner can cause the belt to slip, resulting in squealing or chirping noises, especially during startup or acceleration.
Belt Wear: Excessive wear on the serpentine belt can indicate that the tensioner isn't maintaining proper tension.

Vibration: If the tensioner pulley is damaged or the tensioner itself is failing, it may cause vibrations in the belt system.

Battery Warning Light: Since the alternator may not be operating correctly due to a slipping belt, you might see a battery warning light on the dashboard.

Replacing the Fan Belt Tensioner
If you're experiencing these symptoms, it might be time to replace the fan belt tensioner. Here are the general steps involved:

Tools Needed:
Socket set
Torque wrench
Belt tensioner tool or a long-handled ratchet (to relieve tension on the belt)
Replacement tensioner

Steps:
Disconnect the Battery: To avoid any electrical mishaps, disconnect the negative terminal of the battery.
Relieve Belt Tension: Use the belt tensioner tool or a ratchet to turn the tensioner and relieve tension on the belt. Carefully slide the belt off one of the pulleys.
Remove the Old Tensioner: Unbolt the old tensioner from the engine block. There are usually a few bolts holding it in place.
Install the New Tensioner: Position the new tensioner in place and bolt it down. Make sure its secured tightly.
Reinstall the Belt: Route the serpentine belt over the pulleys according to the belt routing diagram (usually found under the hood or in the owners manual). Use the tensioner tool to relieve tension again and slide the belt over the final pulley.
Reconnect the Battery: Once everything is in place, reconnect the negative battery terminal.

Product Condition : New

Final Check:
After replacing the tensioner, start the engine and observe the belt. It should run smoothly without any noise or vibration.