[lucky6600]

05 SLK350 with 9000 miles. I just noted that there is a whistling sound from the engine. The sound would get louder and higher pitch with the RPM getting higher.
Does anyone have the same problem or it's normal?

 

[Shiny_side_up]

whistling or whining? I had a idler pulley bearing starting to fail that made a noticable whining sound that changed pitch with RPM.

 

[Wimbledon_SLK]

Hi, I have the same noise, apparently its the supercahrger in my case , going in for repair in 4 days, will keep you updated.

P

 

[alroumi]

Hi, I have the same noise, apparently its the supercahrger in my case , going in for repair in 4 days, will keep you updated.

P

Hope you get it fixed as soon as possible, any reason why it is malfunctioning?

 

[lucky6600]

I am going to bring the car in next monday. I would keep you guys updated

 

[CalifSLK]

Some MB V6 have the idler pulley whining problem. Ask the dealer if they think this is the case.

 

[Streetglower]

its very common, the noise is the idler pulley.

 

[Wimbledon_SLK]

Hope you get it fixed as soon as possible, any reason why it is malfunctioning?

Not sure its the supercharger, i think they were just trying to get rid of me for 10 days while the new part "was being ordered" was it?
Customer service ... no comment.

P

 

[Boone Callaway]

I had a possible similiar problem with my SLK 350. There was a whining noise at startup, that went away after it warmed up. It was a pulley.

 

[Whosdis]

As a test, and, if you are mechanically inclined, you can remove the serpentine (accessory) belt and fire it up. Give it a few shots of gas and see if the noise is gone. Then you will know if it is a tensionner or idler (or if it is even belt drive related.) You can run it for three or four minutes, maybe a little longer, just look out for the engine temp. The only problem you can get from this is overheating if you are not careful, or battery drain.

 

[lucky6600]

Here it is....
I got my SLK350 back last Thursday.
This is the job list,
Engine noise, lcated, 272-202-08-19 sheave pully
guide pully a - v belt, replace
replace upper idler pulley c/s .....

However, the problem is ... the noice is still ...
a high pitch noise change with rpm tho

 

[Ikarus]

Here it is....
I got my SLK350 back last Thursday.
This is the job list,
Engine noise, lcated, 272-202-08-19 sheave pully
guide pully a - v belt, replace
replace upper idler pulley c/s .....

However, the problem is ... the noice is still ...
a high pitch noise change with rpm tho

Join the club. The very same part number was replaced in my 280 and it also didn't solve the problem. Another piece of info on the dealer invoice was "Check and found MBZ Bulletin P-B-13.22/01. Applied. Replaced upper guide pulley to eliminate noise". It seems those dealer mechanics tend to browse the service bulletins and apply whatever they find rather than trying to find the actual cause. I was told there are EIGHT pulleys in that engine. On mbslk.de, there were at least two reports from guys who had to get two pulleys replaced before the problem went away.