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Thread: K75S Cooling Question

  1. #1
    Registered User QUICKDRAW's Avatar
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    Unhappy K75S Cooling Question

    Lately there appears to be a single drop (maybe two) of coolent running down the reservor tank after every ride. I've drained and flushed the radiator, cooling fan appears to be working OK but no guess as to the reason for the escaping coolant. Anyone have a suggestion as to what to look for?

  2. #2
    Registered User
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    Radiator cap? Hasit lost its seal so that coolant is forced out to easily and not drawn back in when the bike cools?

    Just a guess

    Roy
    Roy G.
    85 K100RT Ol Ruby "Gone but not forgotten"
    02 K1200LTC Hoss "Wrecked on 9/21/14"
    12 R1200RT

  3. #3
    3 Red Bricks
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    Cracked tank or cracked overflow hose from cap to tank?


    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

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

  4. #4
    univers zero tessler's Avatar
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    I had a similar "leak" from a very worn rubber reservoir tank cover. Replaced it for $2.20 and have been "leak free" since.

  5. #5
    Quote Originally Posted by tessler View Post
    I had a similar "leak" from a very worn rubber reservoir tank cover. Replaced it for $2.20 and have been "leak free" since.
    Quickdraw...Tessler has a good point. Depending on the age of your overflow bottle cap, which is different from the radiator cap; you might want to replace it. BMW actually changed the design on it and at $2.20...a cheap fix, and the most likely culprit.

    The overflow line exits the radiator near the cap, and goes to the bottom of the overflow bottle. So if the drip is from the top of the overflow bottle, its probably the cap and not the overflow line/hose...

    View the diagram on Max BMW's site for details...
    http://www.maxbmwmotorcycles.com/fic...p?mospid=47908



    HTH
    Edde
    93 K75s
    www.motoedde.com

  6. #6

    K75s Cooling Question

    On many K75s the battery cover (side panel) rubs the resevoir cover, either lifting it from it's seat or wearing a hole through it. You can fix this by filing a small bit of the cover off. The resevoirs occaisionally are roughly finished at the top. A bit of filing or sanding fixes this.

  7. #7
    mrich12000
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    Go to Fabric land, get a piece of velcro apply it to the new resevour..

  8. #8
    Registered User QUICKDRAW's Avatar
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    Thumbs up

    Quote Originally Posted by lostboy View Post
    On many K75s the battery cover (side panel) rubs the resevoir cover, either lifting it from it's seat or wearing a hole through it. You can fix this by filing a small bit of the cover off. The resevoirs occaisionally are roughly finished at the top. A bit of filing or sanding fixes this.
    lostboy

    Thanks, after looking at the side panel it does appear to rub against the reservor cap. I'll try a new cap and some sanding and see if the problem goes away. The cap itself is vented. Wonder if it could be a pressure problem as well?

  9. #9
    jcridge
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    Quote Originally Posted by quickdraw View Post
    Lately there appears to be a single drop (maybe two) of coolent running down the reservor tank after every ride. I've drained and flushed the radiator, cooling fan appears to be working OK but no guess as to the reason for the escaping coolant. Anyone have a suggestion as to what to look for?
    I had the same issue a few months ago with my K75 after replacing coolant. The reservoir level was set at 1/2 way up sight tube and radiator was topped up to just above the bottom of neck, air purged and good cap seal. I also had just a few drops for the first couple of trips, then it stopped. The reservoir never read above 1/2 when cool. I can only assume it was trapped air and a slight over fill causing coolant to push out during higher temperatures at high speed. If you find something different let us know.

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