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Thread: 1985 K100RS coolant filler cap

  1. #1
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    1985 K100RS coolant filler cap

    I recently posted inquiring as to a problem with coolant overflowing out of the recovery tank on my bike. PGlaves recommended replacing the coolant filler cap. I ordered a new cap and two gaskets as shown in my Clymer manual and also on a BMW parts microfiche. The problem I have is that the cap is different than the one on my bike, although it does screw on OK. I can't figure out where the gaskets go. My old cap had no gaskets(maybe that was part of the problem?). The larger gasket fits down inside the cap, although it is a loose fit, but I can't figure out where the smaller gasket goes. It does match up with the smaller part of the cap that goes down inside the filler neck, but I don' know how to secure it to the end. Is it secured with silicone or some other adhesive? Anyone with experience with this problem? Thanks in advance for any help.

  2. #2
    3 Red Bricks
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    If your new cap is part# 17 11 1 464 720, it should come with the gaskets already installed.


    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  3. #3
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    That is the same part number, but the cap came without gaskets. I also ordered part #17 11 1460 759 and 17 11 1460316 as per Bobs BMW microfiche. Like I said, the larger one fit inside the cap and does stay in, although it rattles around when the cap is off. the smaller gasket seems to match up with the end of the part of the cap that goes down inside the filler neck, but is not attached.

  4. #4
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    Lee, I feel really dumb. After replying to your answer, I went back out to my shop to look at the part numbers on the bags I received and upon closer inspection of the new cap, I can see that the gaskets ARE installed in it. My apologies for not looking closer, but thanks for the help. I guess I have a couple of spare gaskets if I ever need them.

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