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Discussion Starter · #1 ·
My car (Mini Cooper 2008) is making a loud knocking noise at idle. The noise is not present when the engine is cold, but starts after a few minutes driving.

Here is a video of the noise:

The car has only driven 47 000 miles, works well and uses normal amounts of oil. The previous owner told me that the noise has been present the last two years.

I struggle to find out whats wrong, any thoughts? Thanks.
 

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Hi, we have the same car and we had exactly the same noise. In our case it was the friction wheel which acts on the drive belt to drive the water pump. The reason it's quiet when cold is that the friction wheel is disconnected. As the car warms up, the friction wheel moves against the belt and starts to spin the water pump pulley. We changed the friction wheel and all was quiet. Hope that helps.

Ralph
 

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Hi, we have the same car and we had exactly the same noise. In our case it was the friction wheel which acts on the drive belt to drive the water pump. The reason it's quiet when cold is that the friction wheel is disconnected. As the car warms up, the friction wheel moves against the belt and starts to spin the water pump pulley. We changed the friction wheel and all was quiet. Hope that helps.

Ralph
Thanks!

I have checked the drive belt, and it is very worn. I have ordered a new one, hopefully it will fix the noise. Will change the friction wheel as next step.
 

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Thanks!

I have checked the drive belt, and it is very worn. I have ordered a new one, hopefully it will fix the noise. Will change the friction wheel as next step.
would always do both at same time one lot of labour the pulley is only £25 for new one off ebay you must order the thick belt ie correct belt as well
 

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My car (Mini Cooper 2008) is making a loud knocking noise at idle. The noise is not present when the engine is cold, but starts after a few minutes driving.

Here is a video of the noise:

The car has only driven 47 000 miles, works well and uses normal amounts of oil. The previous owner told me that the noise has been present the last two years.

I struggle to find out whats wrong, any thoughts? Thanks.
Hi, did the belt sort this out or did you need to fit a belt tensioner
Cheers
 
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