Wheel bearing disintegrates - F800

Discussion in 'Parallel Universe' started by tmex, Aug 24, 2009.

  1. Indy Unlimited

    Indy Unlimited Long timer

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    Seems to me to be a design or manufacturing quality issue. The spacer must be the right length so that there is no lateral stress on the inner race of the brake side but also not slop around loose when the axle is tightened. I would try and run a vernier thru the hub and measure the outer race seat to seat distance and make sure the spacer is the same length. If the spacer is longer as per your findings either the spacer needs to be shortened or there needs to be a thin washer type landing created the thickness of the difference to keep the bearing on the sprocket side from being pressed in to far.

    Looks like the manufacturer of the hubs is having 2 issues:

    1. Not changing his tool tip as often as needed so as the tool wears the diameter of the bearing bores gets smaller during CNC milling process.

    2. Spacers are not made to the correct length or the hub milling depth specification is off.

    Woody should be able to determine if it is better to shorten the shaft or add the thin washer. He will ened to check how the sprocket cush assembly and bearings and spacers will fit when the change is made.

    Looks like a very valid analysis to me BlueBull2007. Thanks for sharing with the forum.:clap
  2. EnderTheX

    EnderTheX Dirt Rider

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    Kinda strange stuff with the hub, you would think BMW's QC department would catch this kind of stuff. I sure would specify a QC dimension on any bearing surfaces in my drawings.

    Good info on checking the bearings. Luckily (and expensively) my knobbies wear so quickly it is easy for me to check when the wheel if off too. I will be checking my SV650SF next time I ride it too!! :freaky
  3. Indy Unlimited

    Indy Unlimited Long timer

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    JoelWisman is right about checking your wheels for bearing play it is easy and when you start to feel the play you can plan on replacing the bearings. Us dirt bike riders go through wheel bearings like crazy due to mud and water getting in there and the pounding of off road trails.
  4. Bluebull2007

    Bluebull2007 Adventurer

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    Thanks JoelWiseman for your comments, its appreciated. I know you get nailed to the wall at times by the inmates :D , but I thought I´d let you know your comments are appreciated by people like myself. :thumb

    Keep it up bro & ride safe.
  5. EnderTheX

    EnderTheX Dirt Rider

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    I hope you meant "reputable", I searched the web in case you meant some new level of awesome or shitty supplier (I've seen em both).

    Good luck in the snow! I won't hesitate to ride in the mud but that damn snow is really foreign to us Texas peeps. :evil
  6. duckrider

    duckrider Been here awhile

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    When replacing the wheels, I always wipe the lip seals clean and then pack them with waterproof grease. No water or dust gets past unless either the seals or the spacers are worn. That can be avoided with a stainless sleeve over the aluminum spacer.
  7. Indy Unlimited

    Indy Unlimited Long timer

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    You need to try some good old red clay mud ( Alabama, Tennessee, Kentucky, Ohio )! when going through the muddy water the fine clay dust mud will turn your axles orange from one end to the other! Even the bearing race on a freshly greased axle stands no chance of stopping the entire axle turning orange!:eek1
  8. RedHawk47

    RedHawk47 Adventurer

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    This is the key to alleviating your problem Bluebull2007. The right side bearing is intended to "float" in it's position in the hub. It looked like you used a socket to press the bearing in - that presses the outer race only. By using a solid tool the presses both the outer and inner races the bearing will stop at the sleeve and the outer race will be in the proper "float" position.
  9. Dolly Sod

    Dolly Sod I want to do right, but not right now

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    Is there a backer for the bearing on the other side? Otherwise, what's to keep the collar from simply transferring that pressure to the other bearing?
  10. Bluebull2007

    Bluebull2007 Adventurer

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    There is a circlip on the back end but even if you use a flat piece of metal as suggested above, you are likley to load the inner race of the bearing on the otherside, unless youre verrrrrrry careful on installation.

    Incidentaly I had a flat on my wheel today and noticed that my spacer is loose inside the hub (I dont have that little piece on the end anymore that helps hold it in position. Im happy therefore that there is no pressure through the spacer in my case on either of the two bearings. It makes things a little tricky when installing the wheel back on the swingarm though :D
  11. Bluebull2007

    Bluebull2007 Adventurer

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    Guys (Redhawk & Joel) youre both quite right, something flat is better suited for the job. However I still think you might be able to load the inner race (of the problem bearing in this thread) with any kind of pressure from the floating side.
  12. RedHawk47

    RedHawk47 Adventurer

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    Here's Woody's solution:
    http://www.advrider.com/forums/showpost.php?p=11771946&postcount=38
  13. Zacharia_11

    Zacharia_11 11th Assassin

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  14. craftycoder

    craftycoder Motobrain PDU

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    I contacted BMW Atlanta through this board (thanks YetiGS for the tip) and they offered to start stocking the F800GS wheel bearings so I didn't have to have them inspect my bike and then wait for replacements to be delivered. The dealer called me when they had them in stock and I went in today for repair. They said my disc side rear bearing was installed improperly. It was not quite straight in the hole and was having unusual side loading, or something like that. I didn't get to talk to the mechanic directly. They replaced two of my rear bearing under warranty and sent me on my way. I could see that there was some unusual wear marks on the bad bearing opposed to the good bearing they replaced.

    My thanks to BMW Motorcycles of Atlanta for taking their responsibility to BMW's customers seriously and going the extra mile for me specifically.

    :thumb Bobby, you guys rock!

    I'll check my bearings again when I replace this new tire and report back if my bearing is wrecked again. I'm guessing it will be fine though.
  15. woody's wheel works

    woody's wheel works Built to Last

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    Greetings ,,the powers that be have allowed me back in the general forum,,,

    so i started checking the various threads of interest these last few days now that the post holiday season has settled down....

    and i am truly amazed that this thread with over 800 posts on the subject,not to mention all the ones on the parrallel threads in the vendor section,,have just disappeared.. has everyone been taken care of by their dealers???

    only three people showed up at my doorstep....or does it really hold true that if one denies something long enough that the problem goes away???

    Just curious:dunno

    woody
  16. Zacharia_11

    Zacharia_11 11th Assassin

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    The thread may become a bit more active with actual instances in a few months...

    [​IMG]
  17. robhar54

    robhar54 Been here awhile

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    Hey, if BMW would pay for one of your setups I'd be all over it like white on rice! :evil It's a thing o' beauty, and if I ever want to change wheel sizes, I'd do it for sure, no matter what the "official" solution turns out to be.

    As it is, my dealer took care of the immediate issue by replacing the bearings on warranty, and I'm waiting for BMW to step up with a permanent solution. I figure I have at least a couple thousand miles before I need to start worrying, and I don't have any big trips planned for the next few months....:1drink

    Rob in Seattle
  18. Ducksbane

    Ducksbane Quaaack!!!

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    I wasn't going to comment at this point because I was waiting for BMW Australias response ... but since you asked ...

    I just replaced my rear TKC80 with a heidenau K60 (great tyre) and guess what, my wheel bearings replaced 5,000 km ago with TKM (couldn't get the BMW bearings, out of stock) have failed again. More TKM bearings (too far to the dealer). So YetiGS, put me down for two (and probably counting!)

    The dealer in Newcastle have been good and are asking BMW for a new rear wheel, I don't have their response yet, but if I don't get what I want (NEED actually!) I am prepared to take this a long way up the BMW chain of command. :shoot

    It's a great bike, perfect for me, but I am still not prepared to be killed or maimed by this fault. Hopefully it will come out alright, I really don't want to get rid of the 800.

    As an aside, how's Woodys service to Australia?
  19. PackMule

    PackMule love what you do Super Moderator

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    Joel, was there anything official from BMW on this to the dealers? The hub you replaced was based on bore measurements?

    My dealer told me my bearings were fine when they checked during the other recall work back in the fall. They most certainly were not fine, but I think they didn't pull the wheel and just rotated/yarded on the wheel. They told me it was a noisy chain. :rolleyes

    Just fitted my studded tires, and the bearings are worse than before (no surprise). Still no slop in the wheel yet, though, so I'm going to pull it and bring it in off the bike. See what they say this time. :bash

    If there's a hub replacement involved, I'd like to swap to a sanely-sized rim so I can run tubliss.

    Just want to be armed with a little info before I go in. Thx.
  20. woody's wheel works

    woody's wheel works Built to Last

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    FYI,,i've got a big following down under and take good care of all your requests...
    you need to know that in my other thread i forewarned all of you that just replacing the bearings on a hub with the excessive crush problem is like putting a new band -aid on a wound that needs to be cleaned out ...yes you can get a few extra miles out of your bike til the next bearing wears out and fails...you ought to take this info and confront them with the facts,,ask them to measure your bore before they put the next bearing in it!!!..it should be .001''/.025mm under 47mm ie the diameter of your 6204 bearing.

    here's the link...
    http://www.advrider.com/forums/showthread.php?t=505577

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