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Thread: Ball Bearing Found

  1. #1
    SgtG
    Guest

    Question Ball Bearing Found

    Help!
    While changing oil filter in my 1983 R 100 RT { purchased January 2004 } found a ball bearing in the oil filter compartment.
    This bearing is approximately 9/32nds " diameter and does not show any scoring, scratches or blemishes of any kind.
    Since bought in January have not yet ridden; when purchased engine ran fine with no { noticed } unusual noises, vibrations,etc.
    Does anyone have an idea where this could have come from?

  2. #2
    USERNAME
    Guest
    ok this is one thread that i will watch to see if anyone says, 'they all do that until they get 10k miles on them.

  3. #3
    James.A
    Guest

    Ball bearing in oil filter compartment

    That's a new one on me. I've owned plenty of airheads and never encountered anything other than a filter in my bikes' oil filter holder. I can't think of any reason for anything like that to be there. Is the bike running O.K.? Was it making expensive sounds? Did you re-fill it with oil and take a short drive? Try not to worry about it if the bike seems to be healthy, until you find another ball bearing loose inside.

  4. #4
    SgtG
    Guest
    This is my 2nd BMW { /7 } and suprised me too; it initially looked like an air bubble in the chamber.
    I also dropped the oil pan to check out and except for some sludge everything looked OK.
    In reply to me noticing anything { noises, vibration, etc. } that is a negative; everything sounded fine.
    Bike has all fresh fluids and as soon as battery charges up will start up and see what happens.

  5. #5
    James.A
    Guest

    Ball bearing in oil filter compartment

    Good luck and don't worry. Ya gotta figure it WAS in there when you pulled the filter out and the bike was running up until then. I am assuming you didn't just buy it without hearing it run or riding it.

  6. #6
    Don't forget your towel
    Join Date
    Sep 2003
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    There aren't many ball bearings in the airhead engine, I think the only non-plain bearing is on the front end of the crankshaft. IIRC from the last timing chain I R&R'ed 9/32" sounds about right, but I didn't actually measure and they are caged up tight.

    On the other hand, is there a check valve in the oil cooler assembly that might have self-destructed?

    Steve

  7. #7
    Registered User lkchris's Avatar
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    Mar 2003
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    Previous owner's practical joke!
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  8. #8
    James.A
    Guest

    Ball bearing in oil filter compartment

    The oil cooler thing seems plausible. I have no experience with oil coolers. They circulate from the oil filter cover, don't they?

  9. #9
    Registered User kioolt's Avatar
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    If there is an oil cooler the oil filter will have a cover with two hoses on it that goto the cooler. If memory serves me right there is a thermostat in the oil filter cover. The tool kit for my 82 R100RT came with a bolt that was to be inserted into the oil filter cover when changing oil. The purpose of which was to get all of the oil out of the cooler.
    2004 R1150RT 145,700 miles
    1991 K100LT 126,700 miles
    1982 R100RT 106,900 miles
    Total 379,300 BMW miles

  10. #10
    Sir Darby Darryl Cainey's Avatar
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    Ball Answer!

    I also had the same problem, luck was with me as I was at a National Rally getting my oil changed when they found the ball. It is from the back of the oil filter cavity when looking in the hole. It is part of the pressure relief valve including a spring and a screw plug with a hole in it.

    What you should see when look in the back of the filter chamber is the screw plug threaded in to the wall of the engine block with the ball in the centre.

    The fix is not easy. You have to put the spring in first then the ball on top of the spring end and then the treaded plug has to be screwed in seating the ball and spring. It is best to use a thread locking compound on the plug so it won't come out again. Be careful not to get the compound on the ball and spring!

    This fix is easier if the bike is laying on it's left side so you can let the parts rest by gravity.

    Good Luck!!

  11. #11
    bmwmick
    Guest
    I think Darryl wins the prize. I have never noticed this relief valve before.


    Mick
    Attached Images Attached Images

  12. #12
    SgtG
    Guest

    Ball Bearing

    Thanks Darryl { and others for your input } for the answer; I was leaning toward bearing was some part of the oil filter compartment or the practical joke end.
    I did put on about 15 miles yesterday and did not notice any ill effects.
    I imagine the previous owner had found the spring and locking nut at some time and removed because they were not in the filter compartment when I found the bearing.
    I am going to ride bike { mostley commuting } as is until I can pick up spring and nut and install.

  13. #13
    SgtG
    Guest
    After my last posting was wondering why there is a presure relief valve in filter compartment and possible effects of not having it operational.
    Right now I surmise it is there to allow a path for oil in the event that the oil filter becomes plugged.
    Is this a correct assumption?

  14. #14
    What's that noise...? basketcase's Avatar
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    And the next question is ...

    What happens if you discard the errant ball bearing and just ride?

    '98 BMW Z3 Roadster, '00 R1100RT

    If you insist on exercising a right to burn our flag, first be so kind as to wrap yourself in it and then douse yourself with gasoline just before you strike the match.

  15. #15
    James.A
    Guest

    Ball bearing in oil filter compartment

    I am wondering what happens to the other parts if you find the ball bearing in the filter. At some point, some one must have found the cap screw and spring. Are the /6 and /5 similar? I've been riding airheads since 1987 and this is the first I've heard of this kind of thing.
    Riding and learning.

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