| View previous topic :: View next topic |
| Author |
Message |
Thomas Michael Grimm
Joined: 22 Aug 2017
Posts: 3
Location: Frankfurt au Main, Germany
|
 Posted: Tue Sep 09, 2025 6:38 pm Post subject: Cold start noise from drive belt? |
 |
|
Hello,
on my BentleyArnage T 2002 I have now more or less a few months always a noise from the drive belt or the accessories which get driven by the belt. When you stand in front of the car the noise comes from the right side from my view. I started to change the water pump, after the A/C compressor, after the hydraulic pump, all tension pulley's and guiding pulley`s. Now the noise is still there but still disappears when the engine is warm.
I don`t know what I still could do. Is there any trick to fine adjust something or need the belt some time to run in? If we wax the belt the noise is gone, but after a while the wax goes away and noise comes back.
Thanks in advance for every tip
Regards
Thomas Grimm |
|
| Back to top |
|
 |
bbshriver
Site Admin
Joined: 29 Jun 2021
Posts: 50
Location: North Carolina, USA
|
| Posted: Wed Sep 10, 2025 6:28 pm Post subject: |
|
|
Just to make sure I understand what you have done so far..
It sounds like all the driven accessories and tensioner(s) are replaced now? Have you replaced the belt itself as well? |
|
| Back to top |
|
|
Thomas Michael Grimm
Joined: 22 Aug 2017
Posts: 3
Location: Frankfurt au Main, Germany
|
| Posted: Sun Sep 21, 2025 1:16 pm Post subject: |
|
|
| bbshriver wrote: | Just to make sure I understand what you have done so far..
It sounds like all the driven accessories and tensioner(s) are replaced now? Have you replaced the belt itself as well? |
Hello and thanks for the answer. Yes, sometimes it's better to think first and then start to write. The belt is still the old one which is maybe 6 months old but I have a new one but not installed. So let's see. I will change and then reply.
Regards Thomas |
|
| Back to top |
|
|
bbshriver
Site Admin
Joined: 29 Jun 2021
Posts: 50
Location: North Carolina, USA
|
| Posted: Mon Sep 22, 2025 1:24 pm Post subject: |
|
|
At only 6 months old, it's unlikely the belt is the problem, but good to start with all new, as perhaps the old belt has some wear pattern from an old pulley or something.
Look forward to your response. |
|
| Back to top |
|
|
Martin Webster
Joined: 18 Feb 2003
Posts: 188
Location: Hampshire, United Kingdom
|
| Posted: Mon Sep 29, 2025 4:39 pm Post subject: |
|
|
| Why not invest in an aerosol can of drive belt dressing which you should be able to source from a decent hardware store. You can use the spray while the engine is ticking over and you should find the sound disappears. I had a similar problem on my Silver Cloud years ago and the dressing stopped the noise immediately. It’s basically a very fine powder which stops the belt from slipping in the drive grooves. |
|
| Back to top |
|
|
bbshriver
Site Admin
Joined: 29 Jun 2021
Posts: 50
Location: North Carolina, USA
|
| Posted: Tue Sep 30, 2025 12:37 pm Post subject: |
|
|
Belt dressing can cause problems with EPDM material, and is usually specifically mentioned to not use by belt manufacturers.
(It may be some unique formulas are OK, but this is the general consensus)
Here is an article on how to track down cause of belt noise that may be useful
https://na.daycoaftermarket.com/en/techhub/how-to-fix-serpentine-belt-noise/ |
|
| Back to top |
|
|
Thomas Michael Grimm
Joined: 22 Aug 2017
Posts: 3
Location: Frankfurt au Main, Germany
|
| Posted: Wed Oct 01, 2025 6:53 pm Post subject: |
|
|
| New drive belt installed. No noise anymore. Everything is fine. Really unbelievable. Maybe some fabrication tolerances. |
|
| Back to top |
|
|
bbshriver
Site Admin
Joined: 29 Jun 2021
Posts: 50
Location: North Carolina, USA
|
| Posted: Fri Oct 03, 2025 12:25 pm Post subject: |
|
|
| Good to hear it's resolved! |
|
| Back to top |
|
|
|
