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viviendunkel99

Thalia Serpentine Belt Tensioner Issue

Hey, I've got a 2019 Renault Thalia with a gasoline engine and I'm having a weird issue. My serpentine belt handover doesn't seem to be working anymore. I'm getting a strange noise from the engine, and I suspect it might be the belt tensioner. The car has about 73673 km on it. Any ideas what could be causing this? Could it be the belt bringer/handover itself?

Summary of the thread

A 2019 Renault Thalia owner reported a strange noise from the engine, suspecting an issue with the serpentine belt tensioner. The problem was identified as a potential malfunction in the automatic tensioning system, which could lead to improper belt tension and noise. Inspection for physical damage, excessive play, or jerky movement in the tensioner was recommended. The issue was confirmed and resolved by replacing the defective tensioner, restoring smooth operation.

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4 comment(s)

manuelblaze1

Good day. The symptoms you describe are indeed indicative of a potential belt tensioner malfunction, particularly given the mileage. The 'handover' mechanism you refer to is likely part of the automatic tensioning system. When this fails, the serpentine belt can lose proper tension, leading to noise and potential damage to other components in the belt drive system, such as the idler pulley. Have you inspected the tensioner for any visible signs of wear or damage?

viviendunkel99 (community.author)

Thanks for the reply! I haven't taken it apart yet, but I can visually inspect it. What exactly should I be looking for when I inspect it? Any specific signs that scream 'bad tensioner'?

manuelblaze1

When visually inspecting the belt tensioner, look for signs of physical damage such as cracks, deformation, or excessive play in the pulley. Also, observe the movement of the tensioner arm; if it is jerky or seized, this indicates a problem. Given the potential consequences of a failed belt drive system, I would advise consulting a qualified technician for a thorough diagnosis and repair. Continuing to drive with a faulty tensioner could cause further damage. It can affect your timing belt as well.

viviendunkel99 (community.author)

Appreciate the detailed advice! Took it to the shop, and you were spot on. It was indeed a defective belt tensioner/bringer. Cost me around 455€ to get it fixed. Running smooth again now!

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RENAULT

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THALIASYMBOL