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2001 Mercedes S55
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Discussion Starter · #1 ·
When the car is in park I hardly hear anything but when I put it in reverse I hear this noise like a pulley or a belt. The belt is in very good shape. Considering there are many pulleys how can I tell which one is making the noise?

Laura
 

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2000 S430 156k (11/12)
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What model and year please.
Does it only do when in reverse?
To isolate noises while the engine is on, get a long screwdriver and touch the metal end of it either on or close to the pulley (make sure it is a non moving area) and place your hand on your ear while making a fist with screwdriver handle in your hand. This will help isolate the different noises.
 

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Discussion Starter · #3 ·
2001 S55. No the noise happens always except when it's in park, so it happens when it's in gear. I have heard about the screw driver thing, but what do I expect to hear? and which pulleys should I check?
 

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You can check them all. With the screwdriver, you will be able to isole the noise to an area.
Of course, it may not be a pulley problem.
 

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08 ml320 cdi,slk 230,01 boxster S,04carrera911, 99 S320,67 GT350mustang,02G500L,96 s600 w140, e55 2k
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try the old hose trick, get a hose and put 1 end on the pulley and another on your ear.
 

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It is very easy, all you have to do is to attach socket wrench to the center bolt of the tensioning pulley and move towards left (counterclock) and the belt will loosen.
 

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2001 Mercedes S55
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Discussion Starter · #9 · (Edited)
Cool. Here are 2 pictures showing whether the belt is good or bad. I believe it is in a good shape. I have a video clip of the motor running first thing in the morning but I am not sure I can upload it.
 

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2001 Mercedes S55
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Discussion Starter · #11 ·

Here is a link to my clip. Wait until the 13 sec mark before really listening. I took this clip when I first cranked the car, so it's a bit loud of course. The video amplifies the noise of the car so much making it sound like a truck, so this is an artifacts. The noise I am concerned with is the intermittent noise that you will hear around the 20-30 second.
 

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I just added a video clip. Please comment if you can.
did you try to test all of the suggestions that was made in this thread? if so pls post results so we can analize. thanks
 

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Discussion Starter · #15 ·
Yes Sir I did most of them, except for taking the belt off. My brother also sprayed some WD40? That made it less noisy. With a long screwdriver all sounded the same, all had the same noise level. I will see how it sounds tomorrow and if it is still bad I will take off the belt.
 

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Check out the last comments I made about the crankshaft pulley at the post titled "engine noise and vibration" posted by avi-bar. That might help you.
 

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Discussion Starter · #19 ·
Shoot. After the stupid mistake we did with spraying a WD-40 on the belt I thought I need to pour some water with soap on it to get rid of some of the oil. Keep in mind I didn't drive the car after I sprayed it with a WD-40 yesterday. So This morning I take a bucket of soap and water, I crank the car, and I pour some on the belt parts. After few minutes I get in the car and the ABC light is on! Drive carefully! Oh geez. I am not sure if it's due to the water or the oil. So I drove it to work, and she was bouncing like having no shocks. I get ready to come back and the light is gone, everything is normal. What the heck. Good thing that happened otherwise it would have cost me God knows how much to get it repaired and diagnosed.
 

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you should take out the belt already. for you to check and clean the belt at the same time. never pour water on the engine not unless you disconnect the battery and make sure you dont wet any electrical components attached on it. remember $$$ of repair can be just around the corner if you experiment on this engines.
 
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