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Belt Tensioner Chirp

JohnnyW202

Active Member
Joined
May 22, 2011
Messages
146
Car
2004 Mercedes E270CDI Elegance Saloon, 2004 C200 Kompressor Estate Avantgarde SE Sport Pack
This is pretty much the one remaining problem with my 202 and it's a little bit annoying

It's had the new style belt tensioner and shock fitted along with a new pulley. However, at idle particularly when the car is placed into Drive or the A/C is turned on, the tensioner will rattle. The Belt is also new and the correct part for my particular car... fitting another belt let to a horrific squealing noise (Too tight)

So I'm at a bit of a loss...

Considering it's had the following done to it;
New Bilstein B4 Touring Shocks (Which I think are now as hard as B6's given the firmness in the ride now.
Brake Fluid Change
New Discs all around
New Handbrake Shoes
New Rear Window Regulator
EBC Ultimax Pads Front + Back (I know only Stock quality)
Rear Axle Carrier Bushes, both front and back.
New Front and Rear Springs (Standard, Classic/Elegance)
I've given her a lick of paint to cover up all the rust and it looks alright from a distance but she's not perfect, but at least there's no rust.
Converted her to LPG.

So yeah any help much appreciated.
 
Check the front of the alternator pulley, if it has a black plastic cover then you have a free-wheel pulley fitted

Check that the free-wheel pulley is not seized, this is the usual cause of belt bounce and sometimes you get a short 'squeal' as the engine is shut off.

The pulley costs about £70 and usually can be fitted with the alternator in situ.
 
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Is there a definitive way to check all the pulleys for play etc?

The alternator pulley seemed to move freely when I removed the belt last.
 
Is there a definitive way to check all the pulleys for play etc?

The alternator pulley seemed to move freely when I removed the belt last.

The alternator pulley should drive the alternator in its intended direction but 'free-wheel' when turned in the opposite direction (as similar analogy to a bicycle rear wheel cog) The problem is when the pulley becomes 'seized' and it works as a conventional 'solid' pulley and you get belt bounce as a result.
 
I would agree that this sounds like the alternator pulley. On my car from first chirp to total failure, and the need for a new alternator, was three days.
 
I agree alternator pulley, the part would be about £45 + anyfitting costs
 

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