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Author Topic: Cambelt moves side to side!!!!  (Read 3046 times)

Offline Big Tone

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Cambelt moves side to side!!!!
« on: 04 July 2011, 16:38 »
Found the cause of my squeak!

A tiny bit of anti-slip on the belt and its sweet.

I can see the profile of the belt move about 1-2mm across the pulley. This syncs up with the squeak.

Tension is ok, alignment is fine, everything is located correctly and torqued up.

Any ideas? Suggestions how I may fix it.

Without a new belt our spraying belt spray on it every week.
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Offline AudiA8Quattro

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Re: Cambelt moves side to side!!!!
« Reply #1 on: 04 July 2011, 16:48 »
Did you change water pump, tensioner?
How do you know the belt tension is spot on, could it be a tad tight?
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Offline Big Tone

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Re: Cambelt moves side to side!!!!
« Reply #2 on: 04 July 2011, 17:42 »
waterpump,tensioner and idler pulley all replaced.

True, it could be a tad tight, but whats the best way of relieving this?

back off the tension using a bolt and reapply?
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Offline AudiA8Quattro

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Re: Cambelt moves side to side!!!!
« Reply #3 on: 04 July 2011, 18:29 »
Yes you could give it a try.
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Offline sharki786

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Re: Cambelt moves side to side!!!!
« Reply #4 on: 04 July 2011, 21:57 »
the belt ment to twist 90 degs
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Offline Big Tone

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Re: Cambelt moves side to side!!!!
« Reply #5 on: 04 July 2011, 22:20 »
Quote from: sharki786 on 04 July 2011, 21:57
the belt ment to twist 90 degs

?????
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Offline AudiA8Quattro

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Re: Cambelt moves side to side!!!!
« Reply #6 on: 04 July 2011, 22:42 »
Quote from: Big Tone on 04 July 2011, 22:20
Quote from: sharki786 on 04 July 2011, 21:57
the belt ment to twist 90 degs

?????

On the longest run of the belt, grab it with your finger and thumb, how much can you twist it?
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Offline Big Tone

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Re: Cambelt moves side to side!!!!
« Reply #7 on: 05 July 2011, 08:30 »
I see, can twist 90 degrees, same principle as 15mm deflection.

Tension is fine, noise comes back after a few days very faintly, a LITTLE bit of anti slip and the noise goes away.

Done 2500 Miles+ since cambelt change, so no problems there.

Doing my nut in.
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Offline AudiA8Quattro

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Re: Cambelt moves side to side!!!!
« Reply #8 on: 05 July 2011, 10:07 »
I would say either the water pump, tensioner pulley bearings are a bit noisey, or you need to back the belt tension off ever so slightly.
Was the job done at a garage? parts from the dealer?
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Offline javalin

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Re: Cambelt moves side to side!!!!
« Reply #9 on: 05 July 2011, 10:48 »
+1

90 twist should be "reasonable" force, not finger breaking force.
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You only ever need two tools in life. If it moves and it shouldn't use Duct Tape. If it does not move and it should, use WD40.
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