squealing xantia

tj · Post by tj » 08 Nov 2005, 09:51

My xantia's aux belt squealed like stuck pig on startup ( with aircon engaged ). With aircon off there is no noise. There seems to be no visible means to adjust the tension when I peek around the pulleys. Has anyone managed to adjust the belt tension?

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marpate1 · Post by **marpate1** » 08 Nov 2005, 11:16

tj wrote:My xantia's aux belt squealed like stuck pig on startup ( with aircon engaged ). With aircon off there is no noise. There seems to be no visible means to adjust the tension when I peek around the pulleys. Has anyone managed to adjust the belt tension?
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Aux drive belt is adjust from beneath the car. The idler pulley is on a metal plate which can be adjusted - two locking allan bolts on the side (you may need to remove the platic panel inside the wheelarch) and the adjustment allan bolt underneath.

tj · Post by tj » 13 Nov 2005, 14:56

I took out the whole tensioner after undoiing the the two allen bolt that are screwed into the engine block. I can't see any sign that it can adjusted in anyway. Seems like it rely on the spring to provide tension. Is replacement the only recourse now?

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marpate1 · Post by **marpate1** » 14 Nov 2005, 12:43

tj wrote:I took out the whole tensioner after undoiing the the two allen bolt that are screwed into the engine block. I can't see any sign that it can adjusted in anyway. Seems like it rely on the spring to provide tension. Is replacement the only recourse now?
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Hi, On mine, the tensioner is on an "L" shaped bracket. The bottom of the "L" has a hole in it and through that hole (when fitted on the car) you should see an allen bolt. This bolt when turned anticlockwise pushes down on the "L" to tension the belt.

Cheers,
Mark

Mandrake · Post by **Mandrake** » 14 Nov 2005, 19:23

tj wrote:I took out the whole tensioner after undoiing the the two allen bolt that are screwed into the engine block. I can't see any sign that it can adjusted in anyway. Seems like it rely on the spring to provide tension. Is replacement the only recourse now?

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It would help a lot if you told us exactly what year and engine your car has, as the aux belt configuration is TOTALLY different on different engines, for example the 2.0 petrol 8 valve has an automatic tensioner and the 1.9TD has a manual screw adjustment. (Those are the only two Xantia engines I've worked on)

Regards,
Simon

tj · Post by tj » 15 Nov 2005, 02:23

Mine is petrol 2.0 8v auto, estate body. Another thing I notice is that the crank pulley seems to be slipping sometimes. I noticed that it is not the belt that is slipping but the pulley's hub. Now the squealing only happens when the aircon is on and I am getting confused on whether the noise comes from slipping belt on the aircon compressor pulley or from the slipping hub of the crank pulley.

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Mandrake · Post by **Mandrake** » 15 Nov 2005, 03:32

tj wrote:Mine is petrol 2.0 8v auto, estate body. Another thing I notice is that the crank pulley seems to be slipping sometimes. I noticed that it is not the belt that is slipping but the pulley's hub. Now the squealing only happens when the aircon is on and I am getting confused on whether the noise comes from slipping belt on the aircon compressor pulley or from the slipping hub of the crank pulley.

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Ok, same engine as mine then. There is no manual adjustment for the belt tension, it has a spring loaded tensioner at the bottom as you've already found, so if the belt squeals it could be that the belt is worn, or if you havn't had the car for a long time its possible a previous owner put on a belt thats slightly too long, giving not enough tension.

If its a dry running noise rather than a squeal as such, one of the idler wheels could have a worn out bearing.

As for the crank pulley slipping, I don't think that is possible ??? How are you determining for sure that it is slipping ?

Also one piece of advice if you do change the belt, make sure you draw a diagram of the belt layout as it is NOT covered in the Haynes book of lies, (not for the 2.0 8 valve petrol that is) I spent well over an hour trying out different possible threadings before finding the right one, due to expecting the book to have the right layout in it....

Regards,
Simon

jeremy · Post by **jeremy** » 15 Nov 2005, 06:56

Simon
I think what is being referred to as the crank pulley slipping is the de-lamination of the rubber bonded damper pulleys. If this is suspected I suppose some really sophisticated equipment is required to detect the problem - I'd start by drawing a chalk line on the front face accross the rubber bit, run the engine and see if the line remained straight.

I have heard of the pulley grooves wearing and not fitting the belt properly. I have a noisy belt on my BX which I must replace - but it in fact is one groove thinner than it should be and I think the noise is some slippage, which makes the engine sound as though there is something seriously wrong with it.

tj · Post by tj » 15 Nov 2005, 09:38

Jeremy,
What I have observed is that when the engine is started, the crank pulley is not turning or turning very slowly for a few seconds before it attain normal speed. When this happens, the belt is not moving and the charge light lit up on the dash. Do you mean that the crank pulleyis constructed of outer piece and inner hub bonded by rubber between the two piece? If that is the case can the outer piece fly off from the hub ?

I suspected that there might oil on the belt and pulley grooves, so I degreased them thoroughly yesterday, the noise presisted a while after the degrease, but today it has fallen ominously silent. Should I worry that the silence may signal that things may take a nasty turn?

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