Page 1 of 2 1 2 LastLast
Results 1 to 15 of 24

Thread: Quick $2k O-ring Question

  1. #1
    '92 R100GS '81 R100/t brittrunyon's Avatar
    Join Date
    Sep 2009
    Location
    Embudo, New Mexico
    Posts
    376

    Quick $2k O-ring Question

    I now have a 1981 R 100 & changing the oil for the first time.
    I read http://www.largiader.com/tech/filters/ & have come up with this.
    The canister depth is 3.1.
    It appears to be the squared, not rounded.
    So I plan on using a white o-ring with a shim to protect it & no gasket.
    This would compress the o-ring by about 25%.
    Is my logic flawed?
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  2. #2
    Sir Darby Darryl Cainey's Avatar
    Join Date
    Mar 2003
    Location
    Fenwick, Ontario Canada
    Posts
    2,142
    No, you are correct!
    Ambassador BMW MOA Ontario Canada
    President Niagara BMW Riders #298
    Knights of the Roundel #333
    1977 R100RS, (Retired) 1993 R100GS (just getting started)

  3. #3
    ABC,AMA(LIFE),MOA,RA,IBMW MANICMECHANIC's Avatar
    Join Date
    May 2003
    Location
    Manitowoc, Wisconsin
    Posts
    2,073
    Use just a dab of grease to hold all the parts together when replacing the cover/thermostat.
    F.O.G.Rider, Rounder #6,
    Ambassador, Biergarten co-chair
    BMWRA Wisconsin Region Rep, camping chair

  4. #4
    '92 R100GS '81 R100/t brittrunyon's Avatar
    Join Date
    Sep 2009
    Location
    Embudo, New Mexico
    Posts
    376
    Damn. Now I forgot how it goes.
    If I remember right, the black rubber end of the filter goes in first.
    But what about the black rubber gasket that came with the filter?
    Boy I feel stupid.

     photo B0000085_zpsf24f1a7d.jpg
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  5. #5
    '92 R100GS '81 R100/t brittrunyon's Avatar
    Join Date
    Sep 2009
    Location
    Embudo, New Mexico
    Posts
    376
    Hold the presses!

    I just discovered I have the wrong filter.
    The right filter has rubber on both ends and is smaller than the one in my hand.
    Looks like the correct filter can go either way.

    But still, what about the medium sized black washer/gasket?
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  6. #6
    Administrator 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    12,898
    The black rubber rings are always already on both ends of my filter when I take it out of the box.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  7. #7
    '92 R100GS '81 R100/t brittrunyon's Avatar
    Join Date
    Sep 2009
    Location
    Embudo, New Mexico
    Posts
    376
    Quote Originally Posted by 20774 View Post
    The black rubber rings are always already on both ends of my filter when I take it out of the box.
    Yes, I was speaking a larger one, maybe 1 & 1/4 diameter.
    I don't see how it gets used.
    & from the fiche it doesn't.
    Maybe this is a case where I answered my own question.
    Don't you hate that!
    Thanks for the replies.
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  8. #8
    Registered User
    Join Date
    Dec 2012
    Posts
    939

    Just anoher thought

    Years ago, on my R90/6 I had a single filter, unhinged.

    I was recently sold the BMW filter "Kit" which I was told the only "kit" that BMW offered. It came with a hinged filter. I think the single full length filter is still available but just not in the "kit." Personally, I prefer the full length filter and that will be what I purchase in the future as there is room to install it just over the exhaust pipe.

    Also. Technically the color of an "O" ring isn't the guarantee it is one type or another. The various types of materials (and durometers) in theory could be any of the colors. Having been a buyer for a company that had upward of 80 large plastic injection presses that used hydraulic oil, I have seen the same o-rings offered by different sources but having different colors.

    Generally, the white ones were teflon, but there were buna's and vitons, and others available. I once heard a person swear that the green ones were better than the black ones. That could have been, but the color per se did not dictate or guarantee that, but the material and its durometer rating.

    All of that to say this, there are other sources for those o-rings and much less expensive - you just have to know the factory specs and find the same exact o-ring somewhere else.

    Just a thought.

  9. #9
    Day Dreaming ... happy wanderer's Avatar
    Join Date
    Mar 2010
    Location
    Vancouver, B.C. Canada
    Posts
    1,941
    If you mean part number 5 in the drawing above I've never seen one in any other colour but white. It is a very pliable O Ring and feels like silicone to my fingers.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  10. #10
    Administrator 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    12,898
    Remember that the pictures are somewhat generic. Tom Cutter is constantly saying that one shouldn't try to assemble a bike using the fiche pictures. Kits come with multiple parts to cover multiple situations...you don't always need everything from the kit depending on your situation. In this case, Item 5 is the -098 white o-ring and Item 6 is the shim (or washer as it's listed in the fiche table). For the '81 R100, you need all in the above picture, with the possible exception of the gasket. You said your canister depth is 3.1mm, therefore you don't need the gasket.

    As for folding or non-folding filters, it is my understanding that the filter area available for either type is much more than the bike needs for nominal usage and oil change intervals. There have been instances of collapsing filters and the longer unsupported length of the non-folding filter might be susceptible to collapse. The folding filter, with the two metal rings at the fold, actually provide more strength to help prevent collapsing. I haven't seen a non-folding filter in years, although I understand they are available. I began using the folding kind, have had no problems, and really don't care to go back to the non-folding kind. YMMV...
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  11. #11
    . AntonLargiader's Avatar
    Join Date
    Jul 2004
    Location
    Charlottesville, VA
    Posts
    1,368
    Quote Originally Posted by brittrunyon View Post
    I now have a 1981 R 100 & changing the oil for the first time.
    I read http://www.largiader.com/tech/filters/ & have come up with this.
    The canister depth is 3.1.
    It appears to be the squared, not rounded.
    So I plan on using a white o-ring with a shim to protect it & no gasket.
    This would compress the o-ring by about 25%.
    Is my logic flawed?
    Can you describe how you read my article and came away with that idea? The thought process? I clearly need to change something.

    And Darryl, what exactly are you affirming for him?
    Anton Largiader 72724
    largiader.com bmwra.org

  12. #12
    '92 R100GS '81 R100/t brittrunyon's Avatar
    Join Date
    Sep 2009
    Location
    Embudo, New Mexico
    Posts
    376
    Quote Originally Posted by AntonLargiader View Post
    Can you describe how you read my article and came away with that idea? The thought process? I clearly need to change something.

    And Darryl, what exactly are you affirming for him?
    So are you saying my first post is wrong?
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  13. #13
    . AntonLargiader's Avatar
    Join Date
    Jul 2004
    Location
    Charlottesville, VA
    Posts
    1,368
    It's not the conclusion I would have reached. How exactly did you reach it?
    Anton Largiader 72724
    largiader.com bmwra.org

  14. #14
    '92 R100GS '81 R100/t brittrunyon's Avatar
    Join Date
    Sep 2009
    Location
    Embudo, New Mexico
    Posts
    376
    Quote Originally Posted by AntonLargiader View Post
    It's not the conclusion I would have reached. How exactly did you reach it?
    Well let's see if I can go from brain to print......?

    The canister depth is 3.1mm and not rounded, therefore a shin is needed.
    ..............shim thickness is 0.3mm

    White O-ring is 4mm

    White O-ring + one shim = 4.3mm minus the canister depth of 3.1 = 1.2mm

    1.2mm is approximately 25% of 4.3mm ( I think actually 27.9%)

    You have me questioning my own logic, after all you wrote the book.

    (edit: changed 4.4mm to 4.3mm)
    Last edited by brittrunyon; 04-19-2013 at 07:35 PM.
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  15. #15
    Administrator 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    12,898
    Looks like to me you're basically right, except that you list the o-ring thickness at 4mm but use 4.4mm in your final calculations. Therefore, using 4mm (which is what Anton has on his site), your final compression is 30%. I think that's still OK, but getting a bit high. If you were to use a gasket (0.5mm thick) the compression drops to 17.5%. That's probably acceptable. My canister depth is 2.8mm, so I definitely need the gasket.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •