Radiator leak 690

Discussion in 'Thumpers' started by Albie, Nov 9, 2009.

  1. Albie

    Albie Kool Aid poisoner

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    Well, looks like the fan sits a little too close to the rad and the blades eventually wore a couple holes into the radiator.
    The bikes never been down so I know that didn't happen because of crash damage. The damn fan's just too close. Gonna take it to the dealer later this week and see what they and KTM say about it. A new one costs $500. If they won't replace it for free then I'll just take it down to a rad shop and let them fix it. Then I'll shim the fan housing so it stands of the rad.



    [​IMG]

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    #1
  2. BajaDave

    BajaDave Crazy Bastard

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    That damage is not actually from the fan blade itself striking the radiator, but rather from the housing itself rubbing/beating/wearing itself against the radiator from vibration and bumps.

    I just gave mine a quick feel, and it is not secured tightly enough against the radiator such that it would eliminate movement (it wiggles easily), and that's going to lead to the same problem you have if I don't do something about it. So thanks for the heads up.

    There should be some sort of rubber gasket that sandwiches between the housing and radiator that prevents damage and movement and increases fan efficiency. If not, then the whole fan housing should be spaced away enough so that when it jiggles and wiggles and vibrates, it doesn't touch the radiator core.

    Warranty should cover it so long as there's no indication of crash to the assembly/radiator/bike. Good luck.
    #2
  3. Albie

    Albie Kool Aid poisoner

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    Ahh, makes sense that it's the housing and not the fan blades. I was wondering why I never heard them rubbing. I really didn't even look at the fan closely after I yanked the rad off.

    You're right, some of the other owners may want to take a look to make sure they aren't rubbing holes in them.
    #3
  4. BajaDave

    BajaDave Crazy Bastard

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    Okay 690 owners, heads up! Albie's incident has uncovered a design flaw with the cooling fan. I've got 1500 miles on my 690 and just pulled off the fan to check the wear, and it has already started to make slight grooves into the core tubes where the plastic rubs against it. If you don't do something about it, you WILL eventually spring a leak, just as Albie did... it's just a matter of time. It will likely occur after your warranty is up, though, so you should address the problem now.

    The problem is that KTM did not use a soft, flexible air seal (like a rubber gasket) to fill what should be an intentionally designed small gap between the radiator and the cooling fan housing. Instead, they designed the fit such that there is no gap (or a very, very thin one), such that the hard thin plastic ring of the fan housing lightly contacts the core of the radiator when fitted. Any movement caused by vibration or shock is translated into friction between the fan housing and radiator core, eventually wearing a hole into it. Bad design... period!

    I am going to remove an 1/8 inch or so of the ring on my fan housing and fit a split rubber strip (like what protects the fairing from rubbing into the dash piece on an LC4 Adventure, or like you'd put on the edge of your car door to protect it from chipping paint if you open it onto something) to fill the air gap and then refit it. I'll post pics when I get it done.

    WTF KTM?

    Check yours!
    #4
  5. rapiti

    rapiti IOR Veteran

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    That is odd, as the fan kits for RFS bikes came with weatherstripping to fit between fan housing and rad. Quite an oversight. Good luck with warranty claims, guys!


    #5
  6. mattis

    mattis n00b

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    Thanks for the headsup! Remember to post pictures of your solution :)
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  7. Sutherngintelmen

    Sutherngintelmen around the bend

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    +1 on fix - bike has 1800 on it - need to take a look.

    #7
  8. mattis

    mattis n00b

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    I posted it on a swedish offroad forum (www.soe.se) and a guy (badpitt) replied telling me that his radiator sprung leak at the location of the electrical plug connected to the radiator fan. He provided the following alteration of your image.

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    #8
  9. mattis

    mattis n00b

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    Alright, I've checked it on my bike (09 KTM 690 Enduro R at 7090 kilometers) and I sure have the same markings. They aren't deep, but they will need to be adressed. I am going to call my contact at the KTM dealership as well.
    #9
  10. tehdutchie

    tehdutchie Long timer

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    Same happened to me, posted in the big thread about it too.
    #10
  11. Johnny_5

    Johnny_5 Disassemble!

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    [​IMG]

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    This is where mine's at after 5700 miles. I'm going to try to space the fan housing off the radiator for a short term solution.
    #11
  12. BajaDave

    BajaDave Crazy Bastard

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    Well, here are the pics of my fix. My fan, like probably most of yours, sits just barely off the radiator core with just the tiniest bit of space. I was going to shave off just a little bit of the shroud all the way around before putting the rubber on, but decided to give it a try since the material is actually pretty thin, and the legs of the housing are flexible and would compensate for a slightly tight fit.

    It turned out to be a perfect fit, and only required a slight compression to snug the housing flange tight under the bolt that holds it to the radiator. This should keep the hard nylon edge of the fan shroud from vibrating against the core now and eating a hole into one of the tubes. I will check it in a thousand miles or so and see how it's holding up and if it's doing it's job with no ill side effects.

    The material I used is what KTM puts between the plastic dash piece and the fairing on the 640 Adventure... I just happened to have a extra piece left over that I kept after replacing mine, and I'm glad I did. It appears to be made of a soft PVC material, almost like rubber (could be?). The KTM part number for it is 58214070150

    For whatever reason, the listed price for the approximately 24 inch piece of protector in KTM's USA database is about $115, but that is a known glitch in the system... as I recall I paid less than 10 bucks to order it from the local dealer. You'll have to have your dealer call Ohio to work out the actual price... good luck. Note that European and Australian KTM parts sources list it correctly for the equivelent of just a few bucks.

    You may be able to find it somewhere else, but the stuff that I've seen in auto parts stores is made of a much thicker and quite hard plastic that wouldn't be suitable... like for car door edges.
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    #12
  13. mattis

    mattis n00b

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    Great pictures, I'll get on it!

    Thanks!
    #13
  14. Albie

    Albie Kool Aid poisoner

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    Good stuff Dave. I'm gonna check a local auto parts store and see if they have something like that. Looks like weather stripping.
    #14
  15. LukasM

    LukasM Long timer

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    Great idea, especially if you have to order some other parts anyway. In Europe the cost is €1.80 which is a smoking $2.70. Quite surprising that there is no big mark up like on some other small parts.
    #15
  16. Sutherngintelmen

    Sutherngintelmen around the bend

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    with Justin at KTM Hutt. Sounds like the only supply of 58214070150 is in Austria. He may try to get some and post it up but as is looks like it will be to Pep Boys / Depot / Boater's World for improv match. Goody.

    Baja Dave - can you speculate approximate dimensions?
    #16
  17. Sutherngintelmen

    Sutherngintelmen around the bend

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  18. BajaDave

    BajaDave Crazy Bastard

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    That looks like it will be a good fit. Post up pics when you get it installed.
    #18
  19. Albie

    Albie Kool Aid poisoner

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    Well, took the radiator and fan over to the dealer today. They are going to talk to KTM about doing a good will warranty on it. They felt it was something that shouldn't have happened and that it wasn't my fault. Now just have to wait and see what KTM NA has to say.
    #19
  20. moon48

    moon48 690e

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    Guys, have you got a link to a post in which it is shown how to dismantle the bike, how to get to the radiator to fix it?

    (I know, stupid question, I'm just a really poor mechanic living 200km away from a KTM dealership...)

    Thanks in advance!
    Jacek
    #20