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Weird sound at warm idle...wth is this?

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Old Sep 18, 2020 | 12:51 PM
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Weird sound at warm idle...wth is this?

Got back from a quick drive and noticed this weird sound coming from the front of the engine. I can't make it out. It comes and goes, too.

Any light you guys can shed on this is appreciated!

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Old Sep 18, 2020 | 12:59 PM
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The whirring or the ticking?
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Old Sep 18, 2020 | 01:05 PM
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It's that whirring/almost rattling sound.Hard to describe

Like i said -- it comes and goes.. i hadnt heard it before...so weird

Last edited by doncmleon; Sep 18, 2020 at 01:07 PM.
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Old Sep 18, 2020 | 01:20 PM
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You have an idler pulley that's about to grenade soon.
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Old Sep 18, 2020 | 01:48 PM
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Originally Posted by Jasonoff
You have an idler pulley that's about to grenade soon.
Man i PROMISE, thats what i thought. In fact, Barry (hachiroku) had mentioned inspecting them regularly in an older thread, so I had been planning to replace them soon.

My 2012 has JUST under 60k miles, so I know it's time to replace all of them along with the belt.

Thank you a thousand man!
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Old Sep 18, 2020 | 02:26 PM
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Don't let the pulley fail. It can cause extensive damage. There's a few threads kicking around here with examples.

The whirring sound is normal.
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Old Sep 18, 2020 | 02:33 PM
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Originally Posted by Jasonoff
Don't let the pulley fail. It can cause extensive damage. There's a few threads kicking around here with examples.

The whirring sound is normal.
Oh no my man, i have already ordered my set from FCP Euro LOL

I don't play games. You guys taught me well..
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Old Sep 22, 2020 | 11:35 PM
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I just picked up a 2012 c63 sedan with 39k miles. I made a video of my engine noise at cold start, idle for a couple mins, and after driving it for 15 minutes. I think I might have to replace the pulleys and belt as well.

My hearing is shot so it's difficult to tell where the noise is coming from, I hope it's not a camshaft adjuster or lifters, but I won't know until I check. I really don't feel like pulling off the valve cover, but I probably should.

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Old Sep 23, 2020 | 12:50 AM
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Is it me, or is that just the injectors?
I don't hear lifter tap...normal big V8 music is what im hearing in your video....

edit - at the VERY end I hear something, but i cant make it out..
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Old Sep 23, 2020 | 09:05 AM
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Originally Posted by SnoopLevine
I just picked up a 2012 c63 sedan with 39k miles. I made a video of my engine noise at cold start, idle for a couple mins, and after driving it for 15 minutes. I think I might have to replace the pulleys and belt as well.

My hearing is shot so it's difficult to tell where the noise is coming from, I hope it's not a camshaft adjuster or lifters, but I won't know until I check. I really don't feel like pulling off the valve cover, but I probably should.

https://www.youtube.com/watch?v=DJhoLdF8Xss
That's exactly the sounds it's supposed to make.
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Old Sep 23, 2020 | 10:19 PM
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Originally Posted by doncmleon
Is it me, or is that just the injectors?
I don't hear lifter tap...normal big V8 music is what im hearing in your video....
edit - at the VERY end I hear something, but i cant make it out..
Originally Posted by Jasonoff
That's exactly the sounds it's supposed to make.
Thank you both, I appreciate your responses.
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Old Sep 23, 2020 | 11:44 PM
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At the 2.01-2.05 minute mark when you a looking between the radiator support and engine I think I can hear a idle pulley grinding.
Might be worth looking into further
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Old Sep 23, 2020 | 11:56 PM
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Update on my issue. Ordered the drive belt kit from FCP Euro and it arrived in about 2 days.

https://www.fcpeuro.com/Mercedes~Ben...eywords=517654

Having my shop install it tmrw morning. They said its about a 3 hr job.
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Old Sep 24, 2020 | 02:50 AM
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Originally Posted by Jasonoff
That's exactly the sounds it's supposed to make.
i concur...that thing sounds like it has exactly 39k of easy miles on it.
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Old Sep 24, 2020 | 02:15 PM
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Jumping in on this thread. As I got a new pulley noise cropping up.

Just replaced all pullies and belt tensioner. Torqued to spec 20Nm and 30Nm respectively.

It’s a whirring sound which seems like a bearing but everything is new. Odds I got a bad new pulley? These are from FCP Euro so I’ll replace for free if have too.


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Old Sep 24, 2020 | 02:41 PM
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Originally Posted by doncmleon
Update on my issue. Ordered the drive belt kit from FCP Euro and it arrived in about 2 days.

https://www.fcpeuro.com/Mercedes~Ben...eywords=517654

Having my shop install it tmrw morning. They said its about a 3 hr job.
pulleys are really easy to install...the first time I paid a shop to do it but dealing with issues I've had to do it myself a few times. 3 hours is the absolute max time it'll take.
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