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S3 gearbox like stirring a bag of bolts ...

Discussion in 'A3/S3 Forum (8L Chassis)' started by vfr800, Jul 17, 2013.

  1. vfr800
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    vfr800 Active Member

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    [Jul 17, 2013]
    Hi

    I'm having a little trouble with the gear box on my 2001 AMK S3with 110k on the clock.

    Changing 2nd to 3rd crunches if I try to change up over with the engine over 3k. I have to let the engine revs drop below 3k to avoid a crunch.

    I've noticed when pulling up at traffic lights etc. I get a bit of a crunch block changing back down to first.

    I changed the gear box oil for OE Audi stuff about 3 months ago, I have check the gearbox oil level since this problem started and its fine. The problem has been occurring for about a month now.

    I've done some searching on the forum and it sounds like it could be :
    synchro going?
    engine/gearbox mounts?
    linkage cables?

    i don't know much about gearboxes so a little advice on trouble shooting or what to change / do first would be appreciated.

    Thanks. Liam
    Last edited: Jul 17, 2013
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  3. [Dave B]
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    [Dave B] Daddy

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    [Jul 17, 2013]
    What dogbone bush are you running?
    #2
  4. Alex C
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    Alex C Well-Known Member VCDS Map User

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    [Jul 17, 2013]
    I would guess synchro if your having to let the revs drop down when changing up a gear
    What about changing down - do you have to blip the throttle?

    I rekon your having to wait until the input speed of the gearbox matches the output speed of the gearbox so that everything meshes nicely
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  5. vfr800
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    vfr800 Active Member

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    [Jul 17, 2013]
    Hi Dave B,

    It's a standard OE dogbone, it's relatively new, being replaced in March/April 2012. The car has done <20k on this dogbone.

    Could it be that?

    Liam
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  6. vfr800
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    vfr800 Active Member

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    [Jul 17, 2013]
    No changing down from 4th to 3rd is 'ok', it requires a bit of a gentle push but nothing worrying.

    Dropping into first once at a stand still causes a bit of a clunk sometimes, it did it several times on the way to work this morning.

    Ta, Liam
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  7. Alex C
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    Alex C Well-Known Member VCDS Map User

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    [Jul 17, 2013]
    tbh it sounds like my gearbox. I have to wait a while until i can change from 2 to 3 and from 3 to 4. On the way down i double de-clutch to try and rev match the gearchange

    If I'm only pottering about in the car then its not so bad, but if I'm on a mission then its the gearbox that hinders me, particularly changing down braking into corners

    I guess mine is worse than yours though. Mines been like that for nearly 20k miles
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  8. vfr800
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    vfr800 Active Member

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    [Jul 17, 2013]
    Alex C, you should work for Audi ... "They all do that sir!" ... :crying:

    I was wondering if it could be some dodgy fluid in the clutch hydraulic system causing the clutch slave to not fully extend?
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  9. Alex C
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    Alex C Well-Known Member VCDS Map User

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    [Jul 17, 2013]
    Im not saying it should be like that.... But i cant be arsed to get it fixed until it goes bang. I've had a new poly dog bone mount fitted, gearbox fluid changed once and then the second time gearbox fluid changed with a friction reducer added (molyslip) -- still the same............

    the scenario you mention would make me ask why a hydraulic issue with the clutch slave would only affect up shifting from 3 to 2 making it crunchy unless you rev match it
    Last edited: Jul 17, 2013
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  10. vfr800
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    vfr800 Active Member

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    [Jul 17, 2013]
    I know, I don't exactly understand the mechanics of hundreds of little spinning cogs and stuff in the gearbox so I didn't want to rule it out of my brain. (It's the up shift from 2 to 3 that's the real problem for me.)

    So it sounds like it's not the fluid or dog bone causing the issue.

    Have you changed the left or right engine mounts? or adjusted the shift cables?

    Liam
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  11. Alex C
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    Alex C Well-Known Member VCDS Map User

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    [Jul 17, 2013]
    Sorry, yes up shifting

    No, I haven't changed the engine mounts, that is on my list of things to do, even if it doesn't fit the crunchy gearbox it'll improve the feel of the car. I haven't adjusted the shift cables either
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  12. kwistof
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    kwistof South East Events Moderator Regional Rep

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    [Jul 17, 2013]
    I doubt changing the engine mounts would help the problems you are having with your gearbox tbh mate....

    I recently had both of my engine mounts changed and they had seen better days in the 185k miles they had been used....but I didn't experience the problems you are describing before they were changed and I'm guessing my engine mounts would have been in a worse state than yours are given my mileage.
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  13. JimS3
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    JimS3 Active Member

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    [Jul 17, 2013]
    Defo try adjusting the shift cables, made a big difference on mine.

    There is a good guide on youtube. Costs nothing, easy job.
    Last edited: Jul 17, 2013
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  14. vfr800
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    vfr800 Active Member

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    [Jul 18, 2013]
    Hi

    I've just done the shift cable adjust/reset and it still crunches on 2nd to 3rd changes.

    Guess that leaves mounts or internal gearbox issue :crying: ...?

    Liam
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  15. JimS3
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    JimS3 Active Member

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    [Jul 18, 2013]
    You could try a powerflex red (diesel version) bush in the dogbone engine mount. Probably worth a try for £20 before thinking about rebuilding the gearbox!
    #14
  16. S3_DAVE
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    S3_DAVE Member

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    [Jul 19, 2013]
    Hey Jim do you have a link to the video?
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  17. dancuz
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    dancuz Member

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    [Jul 19, 2013]
    Look up "diesel geek gearbox adjustment" or similar and you will find it on youtube. On phone so not easy for me to check. Made no difference to my box though, so I eventually bought a second hand low mileage one and had it fitted.

    Cheers,

    Dan
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  18. JimS3
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    JimS3 Active Member

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    [Jul 22, 2013]
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  19. vfr800
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    vfr800 Active Member

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    [Sep 24, 2013]
    Hi

    I thought it had all settled down, I've not been driving the car much for a month or so, but the change from 2nd - 3rd still has issues when driven with sparkle.

    How difficult is a DIY gearbox change? I've found a replacement/used gearbox at a decent price. It's not been tested - seller has 'promised' it's in good nick but I'm on my own generally.

    To make the job easier I guess I need a lifting beam?

    My clutch is relatively new so I guess I don't need to remove/mess with that?

    Liam
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  20. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    [Sep 24, 2013]
    Just had my box swapped out as 1st and 2nd disappeared.

    It could be done at home I think but it wont be easy at all with basic axle stands etc as its a good 8-9 hour jobby using a lift etc. I was sorta lucky as my clutch was original so took the opportunity to replace this and the DMF whilst getting the box swapped over. I paid about £350 to a local independent garage to do the labour as I provided all the parts.
    #19

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