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Front Wiper Mechanism

Discussion in 'A4/S4 forum(B5 Chassis)' started by s4mark, May 26, 2007.

  1. s4mark

    s4mark Member

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    Hi all.

    To my dismay, this morning my windscreen wipers gave up for good. They went slowly up and just when they should have returned, they stopped lol. Could I get them to reset to the bottom? No! After 20 mins I managed to get them down to the off position but am a bit concerned with the rain on its way. They are just so slow, fistly thought the rack might need greasing but now I am thinking the motor has packed up.

    Any one had this problem?

    Cheers for all your help and advice:icon_thumright:
     
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  3. AndyMac

    AndyMac Moderator
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  4. s4mark

    s4mark Member

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    did you just clean and regrease it or did you need to replace any parts. Also I think I will need to disconnect my ECU to remove the mechanism. Did you have to do this and if so does anythink need resetting after refitting?

    It is covered under a RAC warranty but need to try and improve them for use over the weekend as the weather looks a little grim.
    Cheers mate.
     
  5. AndyMac

    AndyMac Moderator
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    Just cleaned it up, regreased it and refitted, no parts needed. Audi would have replaced the whole thing.
    I did have to remove the ECU, so disconnected the earth lead on the battery first. Also worthwhile buying a wiper arm removal tool from Machine Mart (£5.99) as they are seated on an angled spline and no amount of WD40 would loosen them. the only thing I replaced was the splashguard under the wipers as this had been butchered by a previous windscreen replacement, and did not fit properly (probably why the shaft was getting wet and ended up seizing). This part was only £10 from dealer, I was expecting it to cost about £50!
    [​IMG]
    [​IMG]
     
  6. shineydave

    shineydave Member

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    if you undo the wiper nut then pull the wipers away from the screen into the erect position (fnnnnr fnnnnr) you can usually wiggle the arm off the splines fairly easily
     
  7. s4mark

    s4mark Member

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    Well have just been out armed with my toolbox and some WD40 as it's all i have at the minute.

    After further investigation I think I have found the problem. As you have all said, the shafts have seized and I think this is due to the following reason :

    Whoever replaced the front screen has kindly broken all the plastic lugs off of the plastic scuttle trim, therefore leaving a nice gap between the screen and the trim, which is letting a nice amount of moisture onto the wiper mechanism :no: .

    Tried to remove wiper arms from the shafts but think i need to get the tool as they don't seem to want to budge at all no matter how much wiggling.

    I just went for soaking the shafts continuously in WD40 and operating them (with the blades off the screen to reduce effort). Have managed to get them going a lot bettter, but still not 100%.

    Will keep soaking them every day until I can get the whole lot out for a clean up.

    Thanks everyone for the advice its been spot on. Nearly went to Audi this morning in a panic but you lot have saved my bacon again.

    Cheers:icon_thumright:
     
  8. AndyMac

    AndyMac Moderator
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    "you can usually wiggle the arm off the splines fairly easily"
    Yes but back on planet earth you need the tool and also a pry bar for additional leverage.
    The problem with the shafts are that they are sealed with an O ring so WD40 can't get anywhere near the seizure. this is mine after a whole 4 hours of soaking. Had to heat it up with a blowtorch in the end and then it came free immediately.
    [​IMG]
     
  9. s4mark

    s4mark Member

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    yep gonna take it all the way out and clean it properly etc. What is the best grease to lube it with? Also I was a bit concerned about removing the ecu but think I will just bite the bullet and go for it. Cheers again
     
  10. AndyMac

    AndyMac Moderator
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    I just used vaseline, which is probably completely wrong, but by the time I'd released it no where was open to buy anything else, so it was all I had to hand.
     
  11. shineydave

    shineydave Member

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    maybe i was lucky then but i just pulled mine straight off once the blade was off the screen. anyway, returning to planet Zorg............

    mine looked nowhere as bad as those and they still seized, god knows how they were running. vaseline isn't the best lubricant for this particular type of shaft but in a pinch i supose it will do. problem i'd guess is it goes all runny when it gets slightly warm so any friction will have it leaking out. any general purpose grease should do.

    unplugging the ECU shouldn't cause any issues, it'll just clear the learned values in there so will take a while to relearn certain parameters
     
  12. s4mark

    s4mark Member

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    is there anyway of getting the mechanism out without actually disconnecting the ecu?

    The only reason I ask is that I have just been out in the car and the wipers are failing again on me, really need stripping down and sorting however.......

    i have to drive to Teignmouth in Devon tomorrow evening so have to have the car running, I cannot risk the slightest chance of my car not working due to me removing and disconnecting the ecu. I do not know anyone with VAGcom etc. Thanks for all the advice and I know I should just go and do it as you all have the experience.

    I am just paranoid due to my previous problems with everything I own or touch lol
     
  13. shineydave

    shineydave Member

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    trust me i'm a stamp collector.

    disconnecting the ECU won't have any adverse affect, i've had mine in and out on a few occasions, fitting a boost gauge, doing the wipers, re-routing my alarm siren etc. just do it wimp, lol, and hurry up, it'll be dark soon;)
     
  14. s4mark

    s4mark Member

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    ok mate I trust ya lol will have to go to halfords tomorrow to get a wiper arm removal tool then i'm gonna do it mate.

    Thanks again mate:icon_thumright:
     
  15. AndyMac

    AndyMac Moderator
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    I didn't remove the ECU completely, just unplugged it from the loom so it could be moved out of the way. Just remember to disconnect the earth strap on the battery. Disconnecting the ECU is no different from disconnecting the battery in terms of resetting.
     
  16. Caesium

    Caesium My BM is fixed!
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    Always a good idea to pop to local car spares shop and get a pot of Molybdenum disulphide grease, it handy for all sorts of things and has high melting point. Failing that get some GP grease. Easy to tell apart, MD is dark grey and GP is yellow.
     
  17. spinaltap

    spinaltap New Member

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    My wipers have same problem, they'd been going slowly for months, almost grinding to a halt, but usually started working ok after being used for a while, and squirting WD40 into the area seemed to help a bit. Bit random as it could be ok for days then an hour later it would be juddery. Then today they stopped dead half way up, had to physically push them to come back down again.

    I've got AA membership so called them out figuring it was worth a go rather than taking everything apart myself (yeah I wimped out) or going to a garage. The guy took the linkages apart, the motor was fine as were the arms and right spindle (when facing car), but the left one was stuck. He ended up drilling couple of small holes in side of it to get some penetrating oil into it, eventually it started moving again. One hole was near the middle of the spindle but he didn't think it was all the way through - there seemed to be some kind of hardened casing, the one near the bottom was definitely into the body of the spindle and let the oil in. Now the oil has worked in seems ok and cost me nowt, will put a squirt of WD40 in every month or so and see how it goes ...

    Thanks,

    Nick
     
  18. AndyMac

    AndyMac Moderator
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    Nice AA bodge. The hole lets the oil in, but will also let it out.
     
  19. Caesium

    Caesium My BM is fixed!
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    Use spray lithium grease, that will stay put
    Clicky
     
  20. shineydave

    shineydave Member

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    lithium grease would be good or try sealing it with a bit of silicon sealant
     
  21. Caesium

    Caesium My BM is fixed!
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    I don't think after a liberal spraying of WD40 and lithium grease that silicone will stick to it, or anything for that matter
     
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  23. shineydave

    shineydave Member

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    yeah, why is it the only stuff that silicon sticks to is me?

    just like the only thing i've successfuly stuck with superglue is myself to myself.
     
  24. AndyMac

    AndyMac Moderator
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    I don't understand why after doing all the hard work of removing the mechanism they didn't just do the easy bit properly.
     
  25. Caesium

    Caesium My BM is fixed!
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    Why should they, they dont give a ****. As long as it works for the next 30 mins then thats it.
    I think you're thinking of proper engineers that like to do a job properly, the AA don't fall into that category or anything even remotely near it.
     
  26. spinaltap

    spinaltap New Member

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    If it packs in again next time it rains I'll add the AA to my hate list, but so far so good. Getting the wipers off and taking the linkage apart was pretty easy, only took couple of minutes and no need to move ECU. The spindle wasn't budging until it got the oil inside the body, don't know if he'd have been able to actually disassemble it and a garage would have just replaced the whole linkage.

    Reckon I'd be able to find a replacement spindle (new or used) on its own without getting a whole new linkage? Maybe a parts specialist or scrap yard?
     
  27. AndyMac

    AndyMac Moderator
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    And 20 seconds with a blow torch would have released the seized spindle. Now he's drilled holes in it you'll need to get a replacement. Just stupid.
     

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