jbenz99

Hello everyone...my 03 CLK 500 has a slight engine noise on idle,The noise seems to disappear when applying throttle.I did some Google search and found a utube video link from someone who has the same identical problem on his Mercedes. I would gladly appreciated any help/suggestion from our MBWorld forum members..Thanking you all in advance !!!


Here is the video link :

Mka77

Hopefully yours isn't missing the parts that one in video was.

RASTATT

Well only listening to the sound and trying to get normal common sense involved...
to be an lifter or internal engine component in general it is rotating to fast....
It also, like I mentioned sounds like something is rotating out of balance...
thats all I can say and is of course dependant on throttle
mechs please!

Rudeney

It looks like he removed the belt to isolate the sound to being internal engine and not an accessory. This could be a timing chain issue. I know this is not an M272/M273 engine with the balance shaft problems, but there are still anecdotal problems with timing chains. The tensioners can break or the chains can stretch. I was getting a clanking noise out of mine when the timing gear started stretching. It would quiet down with increased RPMs.

jbenz99

So it just might need a new timing chain tensioner ? So the chain is loose ? Is there a diy guide to perform this service...? I have done many timing belt replacement but I never worked on timing chain ?My engine runs so smooth .The engine noise is not that loud ..as soon as you give little throttle it goes away ..is this a problem on mercedes benz 500 engines ? Or its normall ? Reason
I ask cause I got no cel and like I mentioned before my engine runs smooth !!

Rudeney

I don't know if it's the timing chain or not - I'm just speculating based on the video. That person removed the belt to isolate the noise to the engine. You might want to try that, too. Also, a mechanic's stethoscope might be good to pinpoint to noises source.

jbenz99

I already removed the drive belt and still same problem .

Glyn M Ruck

Chain or hydraulic lifter. Could also be a manifold/header leak.!

This is a purge valve.

http://www.google.co.za/url?sa=t&rct...2c8-QA&cad=rja

jbenz99

Anyone in our MB forum had or knew someone else with this weird noises on w209 5.0 engine ?

jbenz99

I uploaded a video of the engine noise that to me its sound like a beehive !! I checked the noise with a long screw driver and put one end to the front part of the oil pan and the top end of screw driver to my ear I can hear the buzzing sound but when I do the same method using screwdriver to the back of the oil pan I don't hear the buzzing sound?? Could this be a crank bearing ?? I also took my cars to a mercedes shop and they told me The noise is normal ??? What you guys think !!

video:

Glyn M Ruck

Ouch - That is not normal. It could be a big or small end bearing or damaged lifter.

As Rudney said earlier. remove the Poly V belt to ensure that it is not an accessory. If not take an oil sample & send it to Blackstone for analysis. That will tell you if something is destroying itself in the engine.

PTE

Knowing the Mileage would help. But if it is truely up front near the harmonic balancer inside the C-Case , The oil pump drive sprocket & single roller drive chain is most likely the noise maker
Cheers _PTEngineering

jbenz99

I now have 104,000 miles

jbenz99

so what cause the sprocket to wear down? Loose timing chain ?

jbenz99

Thanks Glyn for your help.... I already remove the drive belt..and buzzing noise is still there...I only hear it on the oil pan front size of engine...Who is blackstone ??

Glyn M Ruck

Blackstone is an oil sample analysis lab in the US.

jbenz99

Ok.... I got it now..thanks !!! I just requested a kit to be mail to my house !!

jbenz99

Where I can find a link on the timing chain replacement on my engine ?? I search and didn't see nothing !

D-MAN

Have you pulled your oil fill cap and check for any metal debris on it?

Glyn M Ruck

Please note that M112 & M113 engines have a duplex twin gang roller chain on the cam drive that is not known for stretching. I know engines at over a million Km with no chain noise.

It is possible that it is the oil pump simplex drive chain as suggested above. This chain is lightly loaded so unlikely unless the tensioner spring 41 has failed.

Sometimes the tensioner is the problem with noisy cam chains. External replacement method is in the Wiki.

Jurgeenh

I have a E500 2006 with 28k miles and its making the same noise as the CLK500 that buzzing noise on c-case, i use a sthetoscope and the buzzing its just in the front of the c-case if you put the steto just above the harmonic balancer (really close to harmonic) on the block you still hearing the noise, makes me think that could be the harmonic itself, but it sound only on cold during a period of 5-7 minutes, when engine its warm it sound nice and quiet, do you solved the issue?

Jurgeenh

Did you solved the issue?

W211 E500

Hello! I have the same problem on his car exactly the noise, if sorted out the problem thanks in advance