Fork seals - What's causing this?

Discussion in 'Airheads' started by RaystheBMW, Dec 2, 2012.

  1. Donkey Hotey

    Donkey Hotey De Jo Momma

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    You put the seals on from the BOTTOM? There aren't ANY bushings or anything else to interfere with doing that?

    My money is that the seals were damaged on installation. I always tape around the top of the fork tube with electrical tape to protect the seal lips, then carefully slide the new seals down the leg.

    There were no snap rings holding those seals in? Just friction? Something isn't right.

    Edit: just saw pictures of an R65 fork tube. Yup, totally smooth on the bottom. I'd still bet on damage to the seals.
    #21
  2. boxerboy81

    boxerboy81 Stay Horizontal

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    Google "Randy Glass fork alignment". It's extensive.

    <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:punctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:ApplyBreakingRules/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:DontVertAlignCellWithSp/> <w:DontBreakConstrainedForcedTables/> <w:DontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="&#45;-"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]-->Changing BMW fork Seals/ springs/ gaiters/ oil, or how I did it on my 1982 model R100RS.

    Nomenclature: I call the chromed tube the fork tube. The fork leg is the lower forged bit that the calipers attach to.

    1. Put new seals in the freezer for 1 hour beforehand.
    2. Loosen, remove, the top fork bolt to allow drainage and refill of fork oil..move h/bars to get to bolt.
    2a. To replace the springs, you need to remove the large hex bolt at the fork top, therefore no need for point 2. That hex bolt is very tight and easy to round off. Make sure your tool fits well.
    3. Remove the lower drainage small bolt. Allow oil to drain.
    3a. Replace springs, loosely replace top bolt.
    4. Disconnect brake calipers from fork legs...hang carefully, no weight or bending of the lines.
    5. Loosen, don't remove, the retaining bolt at the bottom of the fork. Better leverage before the axle comes out.
    6. Remove axle/wheel/front guard.
    7. Now remove retaining bolt, drop fork leg down, leaving the fork tube on the bike. Remove old gaiters/boots.
    8. Clean fork leg internals.
    9. Carefully lever out the old seal. I use a blunted straight screwdriver. Insert the cold new seal, use old seal to push new seal in.
    10. Slide upper gaiter spacer then gaiters onto fork tube.
    11. Install fork leg with new seal carefully over the fork tube..
    12. etc, etc...both sides
    13. Reinstall drain bolt, refill oil, tighten top bolt.
    14. wheels etc back on...
    15. fiddle with the gaiter spacer, locate it into the breather tube on the inside of the lower triple clamp.

    One hour max. Quicker the next time.


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    #22
  3. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    #23
  4. supershaft

    supershaft because I can

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    #24
  5. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Of course not. :rolleyes

    And your detailed and definitive procedure is published where? :deal

    Otherwise... :stfu

    --Bill
    #25
  6. craydds

    craydds Long timer

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    I'll put in my two cents. When replacing forks seals, etc., why would one NOT do the Randy Glass procedure? You have your forks disassembled. My contention is that the only way to reassemble them in the best possible alignment is by using Glass' steps. The reason I say this is because I have DONE it successfully - with one caveat. Replace the stock top plate with a precision machined TOASTER TAN; without a ToasterTan (or San Jose, etc.) top plate the Glass procedure may not work as well. In other words, it is impossible to get the forks in "perfect" alignment without a precision top plate, but the Glass procedure is not faulty. Caveat #2 - the above statements may apply only to the bikes with the flat stamped steel top plate. I have no experience on the bikes with a stock BMW forged or machined upper clamp; I do not know if this applies to RaystheBMW's R65.
    #26
  7. woodgrain

    woodgrain In-Dented Savant

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    My neice had a K75 which had a similar experience. She ordered on-line and the seals never did...seal that is. I just thought they were really old and hard.

    Woodgrain
    #27
  8. supershaft

    supershaft because I can

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    Most of it isn't necessarily wrong. It's just that most of it can be done without all that fuss that article calls for. Plus, as you were alluding to, most all of the article does not apply to R65's or any other bike with "real" top trees. It's a very long winded article that really takes a long winded counter point which I pretty much have done in the past. Other than the article making people aware that the forks need to be lined up, I don't care for it. For the most part, my critique centers on this: Block and tackle? Most all of what they are 'cold forming' can be accomplished simply by loosening and tightening all the fasteners involved in different patterns and even amounts. That is if you have straight parts to start with and there are ways to determine that.
    #28
  9. Big Bamboo

    Big Bamboo Aircooled & Sunbaked

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    Not wanting to start an arguement, but I always just use the method outlined in the factory manual... Including the "bouncy" part before tightening the axle clamp bolt. Works fine for me! :D
    #29
  10. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    That is simply the procedure for reinstalling the front wheel. The Glass article is for for checking the forks for straightness and alignment. And for straightening and correcting the alignment if they're not.

    --Bill
    #30
  11. RaystheBMW

    RaystheBMW 1986 R65

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    I bought them from MAX BMW so I presume they are the real deal. I test fit them over the tubes before installation and they seemed snug enough.
    #31