Noise on startup - rattle noise - driver side near wiper resevior

Back to the 6 buck stethescope.
At least yours sounds external. I've been working with 320Make from Finland on PM and his knock is now down to a small-end bearing or piston slap on one bank of the engine. It's getting expensive quickly now. I believe he has a damaged piston - thrust side skirt!!
Does the noise still go away as the car warms up?
Back to the 6 buck stethescope.
At least yours sounds external. I've been working with 320Make from Finland on PM and his knock is now down to a small-end bearing or piston slap on one bank of the engine. It's getting expensive quickly now. I believe he has a damaged piston - thrust side skirt!!
Does the noise still go away as the car warms up?
I am wondering if this has to do with the idle pulley, tensioner pulley or the alternator I had been reading lately. The thing is, the member who fixed this and recorded the sound didn't match mine at all. His is a screech vs mine is an diesel engine knock.
I think I will just have these parts change out to be safe. I have a feeling that it must be one of those items since I did change out the belt and I am sure the MBtech had tighten up the tensioner or pulley and now the knocking went away or not as apparent.
As far with the noise, it's there back with a vengence. It there on cold start up and goes away when it's warm. It there now on low rpm on Drive or Reverse. When it's warm, I can make the noise when I turn the steering a bit or engaging the steering.
Same area, but I think has something to do with that matte I pointed on my picture and it is behind it. It looked at the area, there are the famous belt tensioner pulley and two other pulley in the area. I haven't identify the two pulleys there.
The Idle pully is not it. I can see it and it's not making noise. I do notice the belt tensioner pulley is kinda wobbing a bit.
Well, I still have that disel knop knop knop sound. It does goes away when it is warm, but I can make it come to life when I turn the steering any either direction which in R or D. Durning the cold start in the morning, I can pinpoint on the driver side area as I had on the pictures. It's either the belt tensioner pulley, and 2 other pulleys in the far left driver side.
The belt tensioner pulley seems to wobble a bit, so I am saying that is a problem part perhaps.

No Matt, I am not uncomfortable. I remember reading about that question, but somehow never answered it when I type my reply. Weird.I paid about $500 parts and labor. Don't know exactly the cost just for the water pump, but this is the whole thing which includes the following:
1. both L & R front arm thrust bushing
2. Drive belt
3. water pump
4. coolant
So you do you think? A fair price or overpaid?
The Best of Mercedes & AMG
I have a feeling it's more of the Super Charge compressor pulley going bad.
I looked at the price for this part $1300
and the AC is $400.Wow oh wow.. That is going to be an expensive fix just to get rid of the noise.
So what do you guys think, is this a fair price for parts? Is this worth fixing now or can I hold off a little while?
So, do you think I should just replace the pulley? Can that part just be replace? Or do I have to replace the whole thing? I don't see just the pulley as a replacement though.
I never really hear of S/C failures in these cars.
I never really hear of S/C failures in these cars.
Yea, if the pulley is replaceable, I would just do that. I think the tech thinks it's much easier to replace the whole thing than to take out parts.
If that is not the noise, then it could be the AC compressor?
My car sounds like a disel engine in the mornings.

It's the AC compressor.
Here's another person with the same noise and resolved by changing out the AC compressor.
http://www.youtube.com/watch?v=kfBaRhc5zgw
1) Substitute the V Belt tensor
2) Substitute the tensor pulley
3) Substitute the alternator pulley
See attachments
Problem solved, it is as good as new!
Hamilton



