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Slight rattle or vibration from S2 engine

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  • Slight rattle or vibration from S2 engine

    Hi all....after checking a slight but noticeable rattle or vibration when engine revs are just raised to 1000 to 1200 I thought it was the alternator/bearings etc...the noise fell silent when I took the alt/belt off so I had the alternator refurbished. Put it back on and the noise is back.
    I can track the noise to appear to come from the alternator and its bracket. I'm a little stumped but after reading the front crank pulley issues I'm even more perturbed...
    any info would be good. It did have a new cam belt and water pump in 2016 but around only 1500miles ago.
    ps...is there anybody in Preston lancashire area who use an Audi specialist....big thanks
    ​​​​

  • #2
    Mine has a small noice to. Its like knak knak knak sometimes

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    • #3
      The bracket is not cracked or loose?

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      • #4
        I've looked at the bracket when the alternator was off but you can't see it all...good point, I will keep trying to sort it...cheers

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        • #5
          Is your crank pulley damper in good order? There is bonded rubber involved here and does perish... If the rubber is failing, would this result in the two halves rattling slightly? It's interesting the noise went away without the alternator belt as it does suggest it's involved somehow. Is the belt pulling on the pulley to make it rattle or is the pulley spinning the alternator bracket to make that rattle or is the belt old, cracked and gone hard causing it to rattle? Oh dear, I'm Rambling away here, hopefully you will get to the bottom of it soon!

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          • #6
            Thanks for your input, the bonded rubber pulley concerns me, I guess it would need to be removed or at least accessed to check.
            I'm still checking where and whenever I can, I must admit the noise has changed since putting back the alternator, the noise is not as loud at least...
            cheers

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            • #7
              Under tray off would be the easiest way of getting to the pulley. It would be difficult to check if the big bolt is tight if you don't have the locking tool. The torque is massive on these but at least you could check the smaller Allen bolts and associated tin plate stuff that is down there and may have been off for the timing belt change...

              I rebuilt a 7a a couple of years ago and had that sinking feeling about half a hour after first start, it sounded like a nasty rattling from under the cam cover. Fearing cam bearing cap loose, off it all came again only to find it was a loose bolt in the heat shield round the exhaust! Over the moon, relieved and angry all at the same time that day.

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              • #8
                Have you checked the tightness of the crank bolt ? I had one come loose a few years ago and the tension of the alternator belt made it knock/ rattle

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                • #9
                  It's a daft question but will the front cross member have to come off to check the the torque of the crank pulley bolt??
                  cheers

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                  • #10
                    I can't comment on the s2 engines as I have a 7a but bear in mind, if you are going to go up to the proper torque you are going to need a crank locking tool and long breaker bar and probably a tube over the end of that - you are going to have to go down from the top of the engine bay. Getting the tool on the bolt is one thing, turning it with whatever is in that area on your car is another

                    If you suspect the pulley GET IT CHECKED QUICKLY loose bolt can lead to woodruff key snapping of your timing pulley and that is the end of your engine

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                    • #11
                      Hang on... When you say it had a new cam belt and water pump a couple of years ago, did a garage do this? Might be worth seeing what they can do in terms of lending you the locking tool they used....

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                      • #12
                        Hi all
                        thanks for the messages, the car is booked in to a local VAG specialist, they are to strip down the front, remove the pulley bolt, check the belt and pulleys with the camshaft etc renew the crank pulley bolt, set the torque and refit all the parts.
                        price with bolt, hire of the wrench and locking plate £300 plus the tax...
                        Finally peace of mind and I can give the car a blast....
                        cheers

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                        • #13
                          You might as well ask them to put on a new belt at the same time.

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                          • #14
                            Had the S2 in today to check the crank pulley for tightness. The garage were great, stripped the front off locked the pulley in place and 're tightened to the correct setting. They said it was tight as it released but not as tight as when it was 're torque.
                            they also fitted new clips to underside panels and checked the cambelt, water pump and pulleys.
                            I feel a bit more confident now but paid £300 for the peace of mind.

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                            • #15
                              Has it stopped rattling?

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