Vibrating V-belt Normal? (Video)
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270 cdi w209
Vibrating V-belt FIXED (Video)
So it's been like this since I got the car and after fitting new belt and tensioner. Had a look at my neighbors 270 s-class and his belt had no vibration at idle. So whats wrong.
Last edited by Reanimation; Nov 30, 2016 at 11:54 AM.
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From: Chicago, IL
2003 CLK500, 2003 CLK55, 2008 CLK550
Wow, that isnt normal!!
Did you replace the tensioner or the guide? There is one that is just a free floating pulley that also goes out, but it is not the tensioner.
Can you take the belt off and manually spin each component to see if any has inconsistent resistance? (ok, ok, dont try to spin the crank pulley)
Is there anything caught in the grooves of any of the pulleys causing it to jump?
Did you replace the tensioner or the guide? There is one that is just a free floating pulley that also goes out, but it is not the tensioner.
Can you take the belt off and manually spin each component to see if any has inconsistent resistance? (ok, ok, dont try to spin the crank pulley)
Is there anything caught in the grooves of any of the pulleys causing it to jump?
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From: Chicago, IL
2003 CLK500, 2003 CLK55, 2008 CLK550
Also, how much play is there in the belt when the car is not running? How much deflection does the belt have? It shouldn't have more than 1/2" or less each direction of play.
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270 cdi w209
I replaced the tensioner with pulley(febi), deflection pulley(febi) and waterpump(febi) along with a new Continental V-belt. I did check the resistance and condition of the components before, Ive just been out and taken the belt off to check again and cant find anything wrong. I started it up and it was nice and smooth for maybe 15 seconds then it changes abruptly. The deflection seems fine not to tight or loose. Could anyone reading please check theirs.
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2008 CLK550 Cab
Not many people here will have that same engine to check, but I have just as long a run on my belt and it does not do that. If the tension is good, then I suspect one of two things - first, although the pulleys you replaced may run smooth, one may not be perfectly round. It may be either slightly oval, or it may be round, but not running on center. Or second, the belt has some heavy spot or other imperfection in it.
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270 cdi w209
Not many people here will have that same engine to check, but I have just as long a run on my belt and it does not do that. If the tension is good, then I suspect one of two things - first, although the pulleys you replaced may run smooth, one may not be perfectly round. It may be either slightly oval, or it may be round, but not running on center. Or second, the belt has some heavy spot or other imperfection in it.
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From: Midlands, UK
CLK W209
If I recall correctly, once on my 270, I remember being able to fit the belt on in two ways. One way gave me too much slack. I could do the same on my 220 also. Made that mistake of not taking a photo of the belt path. Not again...
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270 cdi w209
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CLK55 W209, CL63 W216
Why did you replace the tensioner to begin with? Was the same issue there before you replaced the tensioner?
The tension on the belt is obviously incorrect. Check all pulleys again. Sometimes damage is not visible unless you completely remove the pulley.
Seeing how the problem starts after 15 seconds or so, it's probably a pulley that's not visibly damaged or whatever was installed is incorrect or the belt is stretched etc etc.
The tension on the belt is obviously incorrect. Check all pulleys again. Sometimes damage is not visible unless you completely remove the pulley.
Seeing how the problem starts after 15 seconds or so, it's probably a pulley that's not visibly damaged or whatever was installed is incorrect or the belt is stretched etc etc.
Last edited by megacrazy; Nov 23, 2016 at 02:57 PM.
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Cl 500 216
To check remove the belt hold alternator pulley and turn clockwise it should feel heavy,
Turn pulley anticlockwise it should feel very light almost no feel at all, if it is heavy both ways one way bearing is seized. That's assuming that 270 is a diesel, video sound like it.
Turn pulley anticlockwise it should feel very light almost no feel at all, if it is heavy both ways one way bearing is seized. That's assuming that 270 is a diesel, video sound like it.
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270 cdi w209
To check remove the belt hold alternator pulley and turn clockwise it should feel heavy,
Turn pulley anticlockwise it should feel very light almost no feel at all, if it is heavy both ways one way bearing is seized. That's assuming that 270 is a diesel, video sound like it.
Turn pulley anticlockwise it should feel very light almost no feel at all, if it is heavy both ways one way bearing is seized. That's assuming that 270 is a diesel, video sound like it.
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270 cdi w209
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From: Bognor Regis UK
Alfa 159
When I had a similar wobble on another car it was not the tensioner or any pulleys...it was the cheap pattern belt which over time has softened a lot more in one part than another....new belt sorted it. Glad you sorted it OP.
