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#1 Old 07-26-2013
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AMG "Whistle"

My SLK55's M113 E55 engine has a whine or whistle that my R500's M113 E50 engine completely lacks. The two engines are basically fundamentally the same design except the M113 E55 is stroked for another half liter of displacement.....and that damned whine.

It sounds like a turbo spooling up or the supercharger on my SLK32.....only this engine doesn't have either of those things!

It's definitely speed dependent. Below 2,000 rpm it's livable. Above 2,000 rpm it gets downright annoying. I think it's one or more of the accessory pulleys. Does anyone have any experience with this issue? Any idea which pulley is the culprit and what the fix is? Replacement of the power steering pump, etc? Or can a bearing simply be greased? Belt wear? Belt tension?

Still puzzled that my M113 E50 doesn't exhibit any hint of this. It's silent.
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#2 Old 07-26-2013
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I had it diagnosed as power steering pump last year. Replaced it with a new unit and the sound remained. My service advisor says a lot of AMGs sound the same. The local MBCA region president has an '07 SLK55 with only 18k miles and it makes the exact same noise as mine with 44k miles.

Nothing to worry about I'd say. I've gotten used to it and don't even notice it unless someone reminds me.

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#3 Old 07-26-2013
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I always say vbelt or vbelt pulley or tensioner

https://www.slkworld.com/slk-r171-gen...my-squeak.html


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#4 Old 07-26-2013
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Don't think that's the same issue Jeff. This noise isn't a squeak, chirp, nor does it go away when the belts warm up.

Maybe CT_SLK can make a quick video so we're both sure though?
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#5 Old 07-26-2013
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I just threw it on the wall like spaghetti Mark.
Some call it squeak, squeal, whistle, whine.
Since OP has only been around 3 months, he might not have come across it.

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#6 Old 07-26-2013
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He described it as a supercharger-like whine. My friends said the same thing when they first heard the car when I got the AMG. It's a low whine that speeds up when the motor revs up.

I had an indy shop diagnose it with a stethoscope and right away he found that it was the power steering pump making the noise. There was no leak and the pump seemed fine. He told me not to worry about it and leave it alone. I was paranoid, so I took it to the dealer and had them look at it too. They also diagnosed it as power steering pump and my service advisor said that he wished he had another M113 E55 around so that I could hear it because he felt the noise was familiar but wasn't sure if mine was louder or not.

I had it replaced with a new pump anyway... but the sound remained. A few days later, I compared it to the other '07 SLK55 with 18k miles I mentioned and mine sounded exactly the same as his. More than a year later and the car makes the same noise, but I've gotten used to it. No difference in feel or sound.

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#7 Old 07-26-2013
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I have the same "Whine" and assumed Tensioner or Power Steering related. No issues or problems other than "Whine" during idle but exhaust roar usually mutes it....
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#8 Old 07-26-2013
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Originally Posted by MarkR171 View Post
I had it diagnosed as power steering pump last year. Replaced it with a new unit and the sound remained. My service advisor says a lot of AMGs sound the same. The local MBCA region president has an '07 SLK55 with only 18k miles and it makes the exact same noise as mine with 44k miles.

Nothing to worry about I'd say. I've gotten used to it and don't even notice it unless someone reminds me.
Thanks, at least I know not to waste money on the PS pump. I wonder if these bearings can be greased. The whistle drives me nuts from 2-3,000 rpm. At WOT the exhaust masks it. And the audio system even at low volume will mask it too. But I wanna listen to my engine not some damned flute or the latest Justin Bieber pablum. I may pull the belt and pulley if it comes off and see what I can do to that bearing. If it won't pop off and I can't get the bearing out, maybe some graphite would quiet it down. I'd be willing to put graphite in once a week to get rid of that whistle.
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#9 Old 07-26-2013
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Or just make your car louder

Seriously though, I don't notice mine as much anymore, but that could be because I've since installed a custom x-pipe and deleted the secondary cats. Any amount of throttle might be masking it for me. I do hear it at idle and at parking lot speeds though.

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#10 Old 08-12-2013
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Seems like the 'whistle' kicked in on my car last week. It literally sounds as if the car has a supercharger. I pulled it in to my mechanic and his first question was "did you put a supercharger on your car?" . He diagnosed it to be one of the pulleys and will get back at me with a quote. The whine does get annoying, but I had my resonator removed last Friday and I don't notice it as much.
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#11 Old 08-12-2013
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Originally Posted by tasho3 View Post
Seems like the 'whistle' kicked in on my car last week. It literally sounds as if the car has a supercharger. I pulled it in to my mechanic and his first question was "did you put a supercharger on your car?" . He diagnosed it to be one of the pulleys and will get back at me with a quote. The whine does get annoying, but I had my resonator removed last Friday and I don't notice it as much.
ahem....pay the man please....

I always say vbelt or vbelt pulley or tensioner

https://www.slkworld.com/slk-r171-gen...my-squeak.html


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#12 Old 08-12-2013
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Originally Posted by jbanks15 View Post
ahem....pay the man please....

I always say vbelt or vbelt pulley or tensioner

https://www.slkworld.com/slk-r171-gen...my-squeak.html
I'm going to take car of it as it is very annoying and it bothers me. I believe it's the vbelt pulley.
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#13 Old 08-12-2013
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I know. been there and done that if you've read my thread


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#14 Old 08-16-2013
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Changed the tension pulley and whining noise it's all gone.
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#15 Old 08-16-2013
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Yay!!!!!! silence is golden!


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#16 Old 08-17-2013
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Quote:
Originally Posted by tasho3 View Post
Changed the tension pulley and whining noise it's all gone.
Any chance you'd share the cost?

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#17 Old 08-18-2013
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Any chance you'd share the cost?
Ditto! Very interested in getting rid of "the whistle".
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#18 Old 08-19-2013
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$135 with labor
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#19 Old 08-26-2013
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$135 with labor
Whoa, that's a welcome bit of good news. Thanks for sharing. I hope the tensioner puller solves my problem. I would gladly pay $135 to get rid of the not so musical instrument under the hood.
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#20 Old 10-26-2013
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Changed the tension pulley and whining noise it's all gone.
So the tension pulley is the same thing as the v-belt's jbanks15's thread?


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